DATASHEET - L78L

Positive voltage regulators

Datasheet - production data

Description
The L78L series of three-terminal positive
regulators employ internal current limiting and
thermal shutdown, making them essentially
indestructible. If adequate heat-sink is provided,
they can deliver up to 100 mA output current.
72
They are intended as fixed voltage regulators in a
wide range of applications including local or on-
card regulation for elimination of noise and
distribution problems associated with single-point
regulation. In addition, they can be used with
62 627 power pass elements to make high-current
voltage regulators. The L78L series used as

Zener diode/resistor combination replacement,

Features offers e improvement along with lower quiescent
• Output current up to 100 mA current and lower noise.
• Output voltages of 3.3; 5; 6; 8; 9; 10; 12; 15; 18;
24 V thermal overload protection
• Short-circuit protection
• No external components are required
• Available in either ± 4% (A) or ± 8% (C)
selection

February 2015 DocID2145 Rev 24 1/46

This is information on a product in full production. www.st.com
Contents
L78L Diagram
L78L

Contents

1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1 TO-92 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.2 TO-92 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.3 TO-92 Ammopack packing information . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.4 SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.5 SO-8 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.6 SOT-89 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.7 SOT-89 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

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Contents
L78L Diagram
L78L

1 Diagram

Figure 1. Schematic diagram

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Pin configuration
L78L Maximum ratings
L78L

2 Pin configuration

Figure 2. Pin connection (top view, bottom view for TO-92)

PIN 1 = VOUT
PIN 2 = GND
PIN 3 = VIN
SO-8 SOT-89 TO-92

Figure 3. Test circuits

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Pin configuration
L78L Maximum ratings
L78L

3 Maximum ratings

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

VO = 3.3 to 9 V 30
VI DC Input voltage VO = 12 to 15 V 35 V
VO = 18 to 24 V 40
IO Output current 100 mA
PD Power dissipation Internally limited (1) mW
TSTG Storage temperature range -65 to 150 °C
for L78LxxAC /
0 to 125
TOP Operating junction temperature range L78LxxC °C
for L78LxxAB -40 to 125
1. Our SO-8 package used for voltage regulators is modified internally to have pins 2, 3, 6 and 7 electrically communed to the
die attach flag. This particular frame decreases the total thermal resistance of the package and increases its ability to
dissipate power when an appropriate area of copper on the printed circuit board is available for heat-sinking. The external
dimensions are the same as for the standard SO-8.

Table 2. Thermal data

Symbol Parameter SO-8 TO-92 SOT-89 Unit

RthJC Thermal resistance junction-case (max) 20 15 °C/W

RthJA Thermal resistance junction-ambient (max) 55 (1) 200 55 (1) °C/W
1. Considering 6 cm² of copper Board heat-sink.

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Electrical characteristics
L78L Electrical characteristics
L78L

4 Electrical characteristics

Refer to the test circuits, TJ = 0 to 125 °C, VI = 8.3 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.

Table 3. Electrical characteristics of L78L33C

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 3.036 3.3 3.564 V

IO = 1 to 40 mA, VI = 5.3 to 20 V 2.97 3.63
VO Output voltage V
IO = 1 to 70 mA, VI = 8.3 V 2.97 3.63
VI = 5.3 to 20 V, TJ = 25 °C 150
DVO Line regulation mV
VI = 6.3 to 20 V, TJ = 25 °C 100
IO = 1 to 100 mA, TJ = 25 °C 60
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 30
TJ = 25 °C 6 mA
Id Quiescent current
TJ = 125 °C 5.5 mA
IO = 1 to 40 mA 0.2
DId Quiescent current change mA
VI = 6.3 to 20 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 40 µV
VI = 6.3 to 16.3 V, f = 120 Hz
SVR Supply voltage rejection 41 49 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C, VI = 10 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.

Table 4. Electrical characteristics of L78L05C

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 4.6 5 5.4 V

IO = 1 to 40 mA, VI = 7 to 20 V 4.5 5.5
VO Output voltage V
IO = 1 to 70 mA, VI = 10 V 4.5 5.5
VI = 8.5 to 20 V, TJ = 25 °C 200
DVO Line regulation mV
VI = 9 to 20 V, TJ = 25 °C 150
IO = 1 to 100 mA, TJ = 25 °C 60
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 30
TJ = 25 °C 6 mA
Id Quiescent current
TJ = 125 °C 5.5 mA
IO = 1 to 40 mA 0.2
DId Quiescent current change mA
VI = 8 to 20 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 40 µV
VI = 9 to 20 V, f = 120 Hz
SVR Supply voltage rejection 40 49 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C,VI = 14 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.

Table 5. Electrical characteristics of L78L08C

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 7.36 8 8.64 V

IO = 1 to 40 mA, VI = 8.5 to 20 V 7.2 8.8
VO Output voltage V
IO = 1 to 70 mA, VI = 12 V 7.2 8.8
VI = 8.5 to 20 V, TJ = 25 °C 200
DVO Line regulation mV
VI = 9 to 20 V, TJ = 25 °C 150
IO = 1 to 100 mA, TJ = 25 °C 80
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 40
TJ = 25 °C 6 mA
Id Quiescent current
TJ = 125 °C 5.5 mA
IO = 1 to 40 mA 0.2
DId Quiescent current change mA
VI = 8 to 20 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 60 µV
VI = 9 to 20 V, f = 120 Hz
SVR Supply voltage rejection 36 45 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C, VI = 15 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.

Table 6. Electrical characteristics of L78L09C

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 8.28 9 9.72 V

IO = 1 to 40 mA, VI = 11.5 to 23 V 8.1 9.9
VO Output voltage V
IO = 1 to 70 mA, VI = 15 V 8.1 9.9
VI = 11.5 to 23 V, TJ = 25 °C 250
DVO Line regulation mV
VI = 12 to 23 V, TJ = 25 °C 200
IO = 1 to 100 mA, TJ = 25 °C 80
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 40
TJ = 25 °C 6 mA
Id Quiescent current
TJ = 125 °C 5.5 mA
IO = 1 to 40 mA 0.2
DId Quiescent current change mA
VI = 12 to 23 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 70 µV
VI = 12 to 23 V, f = 120 Hz
SVR Supply voltage rejection 36 44 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C, VI = 16 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.

Table 7. Electrical characteristics of L78L10C

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 9.2 10 10.8 V

IO = 1 to 40 mA, VI = 12.5 to 23 V 9 11
VO Output voltage V
IO = 1 to 70 mA, VI = 16 V 9 11
VI = 12.5 to 23 V, TJ = 25 °C 230
DVO Line regulation mV
VI = 13 to 23 V, TJ = 25 °C 170
IO = 1 to 100 mA, TJ = 25 °C 80
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 40
TJ = 25 °C 6 mA
Id Quiescent current
TJ = 125 °C 5.5 mA
IO = 1 to 40 mA 0.1
DId Quiescent current change mA
VI = 13 to 23 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 60 µV
VI = 14 to 23 V, f = 120 Hz
SVR Supply voltage rejection 37 45 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C, VI = 19 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.

Table 8. Electrical characteristics of L78L12C

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 11.1 12 12.9 V

IO = 1 to 40 mA, VI = 14.5 to 27 V 10.8 13.2
VO Output voltage V
IO = 1 to 70 mA, VI = 19 V 10.8 13.2
VI = 14.5 to 27 V, TJ = 25 °C 250
DVO Line regulation mV
VI = 16 to 27 V, TJ = 25 °C 200
IO = 1 to 100 mA, TJ = 25 °C 100
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 50
TJ = 25 °C 6.5 mA
Id Quiescent current
TJ = 125 °C 6 mA
IO = 1 to 40 mA 0.2
DId Quiescent current change mA
VI = 16 to 27 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 80 µV
VI = 15 to 25 V, f = 120 Hz
SVR Supply voltage rejection 36 42 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C, VI = 23 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified

Table 9. Electrical characteristics of L78L15C

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 13.8 15 16.2 V

IO = 1 to 40 mA, VI = 17.5 to 30 V 13.5 16.5
VO Output voltage V
IO = 1 to 70 mA, VI = 23 V 13.5 16.5
VI = 17.5 to 30 V, TJ = 25 °C 300
DVO Line regulation mV
VI = 20 to 30 V, TJ = 25 °C 250
IO = 1 to 100 mA, TJ = 25 °C 150
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 75
TJ = 25 °C 6.5 mA
Id Quiescent current
TJ = 125 °C 6 mA
IO = 1 to 40 mA 0.2
DId Quiescent current change mA
VI = 20 to 30 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 90 µV
VI = 18.5 to 28.5 V, f = 120 Hz
SVR Supply voltage rejection 33 39 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C, VI = 27 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.

Table 10. Electrical characteristics of L78L18C

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 16.6 18 19.4 V

IO = 1 to 40 mA, VI = 22 to 33 V 16.2 19.8
VO Output voltage V
IO = 1 to 70 mA, VI = 27 V 16.2 19.8
VI = 22 to 33 V, TJ = 25 °C 320
DVO Line regulation mV
VI = 22 to 33 V, TJ = 25 °C 270
IO = 1 to 100 mA, TJ = 25 °C 170
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 85
TJ = 25 °C 6.5 mA
Id Quiescent current
TJ = 125 °C 6 mA
IO = 1 to 40 mA 0.2
DId Quiescent current change mA
VI = 23 to 33 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 120 µV
VI = 23 to 33 V, f = 120 Hz
SVR Supply voltage rejection 32 38 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C, VI = 33 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.

Table 11. Electrical characteristics of L78L24C

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 22.1 24 25.9 V

IO = 1 to 40 mA, VI = 27 to 38 V 21.6 26.4
VO Output voltage V
IO = 1 to 70 mA, VI = 33 V 21.6 26.4
VI = 27 to 38 V, TJ = 25 °C 350
DVO Line regulation mV
VI = 28 to 38 V, TJ = 25 °C 300
IO = 1 to 100 mA, TJ = 25 °C 200
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 100
TJ = 25 °C 6.5 mA
Id Quiescent current
TJ = 125 °C 6 mA
IO = 1 to 40 mA 0.2
DId Quiescent current change mA
VI = 28 to 38 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 200 µV
VI = 29 to 35 V, f = 120 Hz
SVR Supply voltage rejection 30 37 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C (AC) TJ = -40 to 125 °C (AB),VI = 8.3 V,
IO = 40mA, CI = 0.33 μF, CO = 0.1 μF unless otherwise specified.

Table 12. Electrical characteristics of L78L33AB and L78L33AC

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 3.168 3.3 3.432 V

IO = 1 to 40 mA, VI = 5.3 to 20 V 3.135 3.465
VO Output voltage V
IO = 1 to 70 mA, VI = 8.3 V 3.135 3.465
VI = 5.3 to 20 V, TJ = 25 °C 150
DVO Line regulation mV
VI = 6.3 to 20 V, TJ = 25 °C 100
IO = 1 to 100 mA, TJ = 25 °C 60
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 30
TJ = 25 °C 6 mA
Id Quiescent current
TJ = 125 °C 5.5 mA
IO = 1 to 40 mA 0.1
DId Quiescent current change mA
VI = 6.3 to 20 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 40 µV
VI = 6.3 to 16.3 V, f = 120 Hz
SVR Supply voltage rejection 41 49 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C (AC) TJ = -40 to 125 °C (AB), VI = 10 V,

IO = 40 mA, CI = 0.33 μF, CO = 0.1 μF unless otherwise specified.

Table 13. Electrical characteristics of L78L05AB and L78L05AC

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 4.8 5 5.2 V

IO = 1 to 40 mA, VI = 7 to 20 V 4.75 5.25
VO Output voltage V
IO = 1 to 70 mA, VI = 10 V 4.75 5.25
VI = 7 to 20 V, TJ = 25 °C 150
DVO Line regulation mV
VI = 8 to 20 V, TJ = 25 °C 100
IO = 1 to 100 mA, TJ = 25 °C 60
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 30
TJ = 25 °C 6 mA
Id Quiescent current
TJ = 125 °C 5.5 mA
IO = 1 to 40 mA 0.1
DId Quiescent current change mA
VI = 8 to 20 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 40 µV
VI = 8 to 18 V, f = 120 Hz
SVR Supply voltage rejection 41 49 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C (AC) TJ = -40 to 125 °C (AB), VI = 12 V,

IO = 40 mA, CI = 0.33 μF, CO = 0.1 μF unless otherwise specified.

Table 14. Electrical characteristics of L78L06AB and L78L06AC

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 5.76 6 6.24 V

IO = 1 to 40 mA, VI = 8.5 to 20 V 5.7 6.3
VO Output voltage V
IO = 1 to 70 mA, VI = 12 V 5.7 6.3
VI = 8.5 to 20 V, TJ = 25 °C 150
ΔVO Line regulation mV
VI = 9 to 20 V, TJ = 25 °C 100
IO = 1 to 100 mA, TJ = 25 °C 60
ΔVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 30
TJ = 25 °C 6 mA
Id Quiescent current
TJ = 125 °C 5.5 mA
IO = 1 to 40 mA 0.1
ΔId Quiescent current change mA
VI = 9 to 20 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 50 µV
VI = 9 to 20 V, f = 120 Hz
SVR Supply voltage rejection 39 46 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C (AC) TJ = -40 to 125 °C (AB), VI = 14 V,

IO = 40 mA, CI = 0.33 μF, CO = 0.1 μF unless otherwise specified.

Table 15. Electrical characteristics of L78L08AB and L78L08AC

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 7.68 8 8.32 V

IO = 1 to 40 mA, VI = 10.5 to 23 V 7.6 8.4
VO Output voltage V
IO = 1 to 70 mA, VI = 14 V 7.6 8.4
VI = 10.5 to 23 V, TJ = 25 °C 175
DVO Line regulation mV
VI = 11 to 23 V, TJ = 25 °C 125
IO = 1 to 100 mA, TJ = 25 °C 80
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 40
TJ = 25 °C 6 mA
Id Quiescent current
TJ = 125 °C 5.5 mA
IO = 1 to 40 mA 0.1
DId Quiescent current change mA
VI = 11 to 23 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 60 µV
VI = 12 to 23 V, f = 120 Hz
SVR Supply voltage rejection 37 45 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C (AC) TJ = -40 to 125 °C (AB), VI =15 V,
IO= 40 mA, CI = 0.33 μF, CO = 0.1 μF unless otherwise specified.

Table 16. Electrical characteristics of L78L09AB and L78L09AC

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 8.64 9 9.36 V

IO = 1 to 40 mA, VI = 11.5 to 23 V 8.55 9.45
VO Output voltage V
IO = 1 to 70 mA, VI = 15 V 8.55 9.45
VI = 11.5 to 23 V, TJ = 25 °C 225
DVO Line regulation mV
VI = 12 to 23 V, TJ = 25 °C 150
IO = 1 to 100 mA, TJ = 25 °C 80
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 40
TJ = 25 °C 6 mA
Id Quiescent current
TJ = 125 °C 5.5 mA
IO = 1 to 40 mA 0.1
DId Quiescent current change mA
VI = 12 to 23 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 70 µV
VI = 12 to 23 V, f = 120 Hz
SVR Supply voltage rejection 37 44 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C (AC) TJ = -40 to 125 °C (AB), VI= 16 V,
IO = 40mA, CI = 0.33 μF, CO = 0.1 μF unless otherwise specified.

Table 17. Electrical characteristics of L78L10AC

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 9.6 10 10.4 V

IO = 1 to 40 mA, VI = 12.5 to 23 V 9.5 10.5
VO Output voltage V
IO = 1 to 70 mA, VI = 16 V 9.5 10.5
VI = 12.5 to 23 V, TJ = 25 °C 230
DVO Line regulation mV
VI = 13 to 23 V, TJ = 25 °C 170
IO = 1 to 100 mA, TJ = 25 °C 80
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 40
TJ = 25 °C 6 mA
Id Quiescent current
TJ = 125 °C 5.5 mA
IO = 1 to 40 mA 0.1
DId Quiescent current change mA
VI = 13 to 23 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 60 µV
VI = 14 to 23 V, f = 120 Hz
SVR Supply voltage rejection 37 45 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

2020/ DocID2145 Rev 24 2020/

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C (AC) TJ = -40 to 125 °C (AB), VI =19 V,
IO = 40 mA, CI = 0.33 μF, CO = 0.1 μF unless otherwise specified.

Table 18. Electrical characteristics of L78L12AB and L78L12AC

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 11.5 12 12.5 V

IO = 1 to 40 mA, VI = 14.5 to 27 V 11.4 12.6
VO Output voltage V
IO = 1 to 70 mA, VI = 19 V 11.4 12.6
VI = 14.5 to 27 V, TJ = 25 °C 250
DVO Line regulation mV
VI = 16 to 27 V, TJ = 25 °C 200
IO = 1 to 100 mA, TJ = 25 °C 100
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 50
TJ = 25 °C 6.5 mA
Id Quiescent current
TJ = 125 °C 6 mA
IO = 1 to 40 mA 0.1
DId Quiescent current change mA
VI = 16 to 27 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 80 µV
VI = 15 to 25 V, f = 120 Hz
SVR Supply voltage rejection 37 42 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C (AC) TJ = -40 to 125 °C (AB),VI = 23 V,

IO= 40 mA, CI = 0.33 μF, CO = 0.1 μF unless otherwise specified.

Table 19. Electrical characteristics of L78L15AB and L78L15AC

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 14.4 15 15.6 V

IO = 1 to 40 mA, VI = 17.5 to 30 V 14.25 15.75
VO Output voltage V
IO = 1 to 70 mA, VI = 23 V 14.25 15.75
VI = 17.5 to 30 V, TJ = 25 °C 300
DVO Line regulation mV
VI = 20 to 30 V, TJ = 25 °C 250
IO = 1 to 100 mA, TJ = 25 °C 150
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 75
TJ = 25 °C 6.5 mA
Id Quiescent current
TJ = 125 °C 6 mA
IO = 1 to 40 mA 0.1
DId Quiescent current change mA
VI = 20 to 30 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 90 µV
VI = 18.5 to 28.5 V, f = 120 Hz
SVR Supply voltage rejection 34 39 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

2222/ DocID2145 Rev 24 2222/

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C (AC) TJ = -40 to 125 °C (AB),VI = 27 V,

IO = 40 mA, CI = 0.33 μF, CO = 0.1 μF unless otherwise specified.

Table 20. Electrical characteristics of L78L18AC

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 17.3 18 18.7 V

IO = 1 to 40 mA, VI = 22 to 33 V 17.1 18.9
VO Output voltage V
IO = 1 to 70 mA, VI = 27 V 17.1 18.9
VI = 22 to 33 V, TJ = 25 °C 320
DVO Line regulation mV
VI = 22 to 33 V, TJ = 25 °C 270
IO = 1 to 100 mA, TJ = 25 °C 170
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 85
TJ = 25 °C 6.5 mA
Id Quiescent current
TJ = 125 °C 6 mA
IO = 1 to 40 mA 0.1
DId Quiescent current change mA
VI = 23 to 33 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 120 µV
VI = 23 to 33 V, f = 120 Hz
SVR Supply voltage rejection 33 38 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

2323/ DocID2145 Rev 24 2323/

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Electrical characteristics
L78L Electrical characteristics
L78L

Refer to the test circuits, TJ = 0 to 125 °C (AC) TJ = -40 to 125 °C (AB),VI = 33 V,

IO = 40 mA, CI = 0.33 μF, CO = 0.1 μF unless otherwise specified.

Table 21. Electrical characteristics of L78L24AB and L78L24AC

Symbol Parameter Test conditions Min. Typ. Max. Unit

VO Output voltage TJ = 25 °C 23 24 25 V
IO = 1 to 40 mA, VI = 27 to 38 V 22.8 25.2
VO Output voltage V
IO = 1 to 70 mA, VI = 33 V 22.8 25.2
VI = 27 to 38 V, TJ = 25 °C 350
DVO Line regulation mV
VI = 28 to 38 V, TJ = 25 °C 300
IO = 1 to 100 mA, TJ = 25 °C 200
DVO Load regulation mV
IO = 1 to 40 mA, TJ = 25 °C 100
TJ = 25 °C 6.5 mA
Id Quiescent current
TJ = 125 °C 6 mA
IO = 1 to 40 mA 0.1
DId Quiescent current change mA
VI = 28 to 38 V 1.5
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 200 µV5y
VI = 29 to 33 V, f = 120 Hz
SVR Supply voltage rejection 31 37 dB
IO = 40 mA, TJ = 25 °C
Vd Dropout voltage 1.7 V

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L78L performance
Typical Typical performance
L78L

5 Typical performance
Figure 4. L78L05/12 output voltage vs. ambient Figure 5. L78L05/12/24 load characteristics
temperature

Figure 6. L78L05/12/24 thermal shutdown Figure 7. L78L05/12 quiescent current vs.

output current

Figure 8. L78L05 quiescent current vs. input Figure 9. L78L05/12/24 output characteristics
voltage

2525/ DocID2145 Rev 24 2525/

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L78L performance
Typical Typical performance
L78L

2626/ DocID2145 Rev 24 2626/

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L78L performance
Typical Typical performance
L78L

Figure 10. L78L05/12/24 ripple rejection Figure 11. L78L05 dropout characteristics

Figure 12. L78L short-circuit output current

2727/ DocID2145 Rev 24 2727/

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L78L application
Typical Typical application
L78L

6 Typical application

Figure 13. High output current short-circuit protected

Figure 14. Outuput boost circuit

2828/ DocID2145 Rev 24 2828/

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L78L application
Typical Typical application
L78L

Figure 15. Current regulator

Figure 16. Adjustable output regulator

2929/ DocID2145 Rev 24 2929/

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L78L
Package information Package information
L78L

7 Package information

In order to meet environmental requirements, ST offers these devices in different grades of

ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.

7.1 TO-92 package information

Figure 17. TO-92 package outline

0102782 D

3030/ DocID2145 Rev 24 3030/

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L78L
Package information Package information
L78L

Table 22. TO-92 mechanical data

mm
Dim.
Min. Typ. Max.

A 4.32 4.95
b 0.36 0.51
D 4.45 4.95
E 3.30 3.94
e 2.41 2.67
e1 1.14 1.40
L 12.70 15.49
R 2.16 2.41
S1 0.92 1.52
W 0.41 0.56
V 5°

7.2 TO-92 packing information

Figure 18. TO-92 tape and reel outline
GHOW D 3 7
$ 7 7

+ GHOWD +

+
+
G
/ :

: :
:

) )
'
3 W
3

'5$:,1* 127,1 6&$/(

3030/ DocID2145 Rev 24 3030/

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L78L
Package information Package information
L78L

Table 23. TO-92 tape and reel mechanical data

mm
Dim.
Min. Typ. Max.

A1 4.80
T 3.80
T1 1.60
T2 2.30
d 0.45 0.47 0.48
P0 12.50 12.70 12.90
P2 5.65 6.35 7.05
F1, F2 2.40 2.50 2.94
F3 4.98 5.08 5.48
delta H -2.00 2.00
W 17.50 18.00 19.00
W0 5.5 6.00 6.5
W1 8.50 9.00 9.25
W2 0.50
H 18.50 21
H3 0.5 1 2
H0 15.50 16.00 18.8
H1 25.0 27.0
D0 3.80 4.00 4.20
t 0.90
L 11.00
l1 3.00
delta P -1.00 1.00
Ø1 352 355 358
Ø2 28 30 32
u 44 47 50

3131/ DocID2145 Rev 24 3131/

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L78L
Package information Package information
L78L

7.3 TO-92 Ammopack packing information

Figure 19. TO-92 Ammopack tape and reel outline
T
A1 2 T1
H1 delta H
H H3
H0
L d
W2
l1
W0 W
W1
F1 F2

F3
D0
P2 t
P0

0050910S_Rev_U

3232/ DocID2145 Rev 24 3232/

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L78L
Package information Package information
L78L

Table 24. TO-92 Ammopack tape and reel mechanical data

mm
Dim.
Min. Typ. Max.

A1 4.80
T 3.80
T1 1.60
T2 2.30
d 0.45 0.47 0.48
P0 12.50 12.70 12.90
P2 5.65 6.35 7.05
F1, F2 2.40 2.50 2.94
F3 4.98 5.08 5.48
delta H -2.00 2.00
W 17.50 18.00 19.00
W0 5.5 6.00 6.5
W1 8.50 9.00 9.25
W2 0.50
H 18.50 21
H3 0.5 1 2
H0 15.50 16.00 18.8
H1 25.0 27.0
D0 3.80 4.00 4.20
t 0.90
L 11.00
l1 3.00
delta P -1.00 1.00

3333/ DocID2145 Rev 24 3333/

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L78L
Package information Package information
L78L

7.4 SO-8 package information

Figure 20. SO-8 package outline

0016023_G_FU

3434/ DocID2145 Rev 24 3434/

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L78L
Package information Package information
L78L

Table 25. SO-8 mechanical data

mm
Dim.
Min. Typ. Max.

A 1.75
A1 0.10 0.25
A2 1.25
b 0.31 0.51
b1 0.28 0.48
c 0.10 0.25
c1 0.10 0.23
D 4.80 4.90 5.00
E 5.80 6.00 6.20
E1 3.80 3.90 4.00
e 1.27
h 0.25 0.50
L 0.40 1.27
L1 1.04
L2 0.25
k 0° 8°
ccc 0.10

3535/ DocID2145 Rev 24 3535/

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L78L
Package information Package information
L78L

Figure 21. SO-8 recommended footprint

Footprint_0016023_G_FU

3636/ DocID2145 Rev 24 3636/

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L78L
Package information Package information
L78L

7.5 SO-8 packing information

Figure 22. SO-8 tape and reel outline

Figure 23. SO-8 tape and reel mechanical data

mm
Dim.
Min. Typ. Max.

A 330
C 12.8 13.2
D 20.2
N 60
T 22.4
-
Ao 8.1 8.5
Bo 5.5 5.9
Ko 2.1 2.3

3737/ DocID2145 Rev 24 3737/

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L78L
Package information Package information
L78L

Po 3.9 4.1
P 7.9 8.1

3838/ DocID2145 Rev 24 3838/

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L78L
Package information Package information
L78L

7.6 SOT-89 package information

Figure 24. SOT-89 package outline

B5(9B(

3939/ DocID2145 Rev 24 3939/

46 46
L78L
Package information Package information
L78L

Table 26. SOT-89 mechanical data

mm
Dim.
Min. Typ. Max.

A 1.40 1.60
B 0.44 0.56
B1 0.36 0.48
C 0.35 0.44
C1 0.35 0.44
D 4.40 4.60
D1 1.62 1.83
D3 0.90
E 2.29 2.60
e 1.42 1.57
e1 2.92 3.07
H 3.94 4.25
H1 2.70 3.10
K 1° 8°
L 0.89 1.20
R 0.25
b 90°

4040/ DocID2145 Rev 24 4040/

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L78L
Package information Package information
L78L

Figure 25. SOT-89 recommended footprint

)RRWSULQW

Packaging mechanical data

4040/ DocID2145 Rev 24 4040/

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L78L
Package information Package information
L78L

7.7 SOT-89 packing information

Figure 26. SOT-89 carrier tape outline

B(

Table 27. SOT-89 carrier tape dimensions

mm.
Dim.
Values Tolerance

Ao 4.52 ± 0.10
Bo 4.91 ± 0.10
Ko 1.90 ± 0.10
F 5.50 ± 0.10
E 1.75 ± 0.10
W 12 ± 0.30
P2 2 ± 0.10
Po 4 ± 0.10
P1 8 ± 0.10
T 0.30 ± 0.10
D Æ 1.55 ± 0.05
D1 Æ 1.60 ± 0.10

4141/ DocID2145 Rev 24 4141/

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Order codes
L78L Order codes
L78L

8 Order codes

Table 28. Order codes

Part numbers
Output
voltages
TO-92 TO-92
SO-8 TO-92 (Bag) (1) SOT-89 (V)
(ammopack) (tape and reel)

L78L33ABD-TR L78L33ABZ-AP L78L33ABUTR 3.3

L78L33ACD13TR L78L33ACZ L78L33ACZ-AP L78L33ACZTR L78L33ACUTR 3.3
L78L33CD-TR 3.3
L78L05ABD13TR L78L05ABZ L78L05ABZ-AP L78L05ABZ-TR L78L05ABUTR 5
L78L05ACD13TR L78L05ACZ L78L05ACZ-AP L78L05ACZTR L78L05ACUTR 5
L78L05CD13TR L78L05CZ 5
L78L06ABZ L78L06ABUTR 6
L78L06ACD13TR L78L06ACUTR 6
L78L08ABD13TR L78L08ABZ-AP L78L08ABZTR L78L08ABUTR 8
L78L08ACD13TR L78L08ACZ L78L08ACZ-AP L78L08ACZTR L78L08ACUTR 8
L78L08CD13TR 8
L78L09ABD13TR L78L09ABZ L78L09ABUTR 9
L78L09ACD13TR L78L09ACZ-AP L78L09ACZ-TR L78L09ACUTR 9
L78L09CD13TR 9
L78L10ACUTR 10
L78L12ABD-TR L78L12ABZ L78L12ABZ-AP L78L12ABUTR 12
L78L12ACD13TR L78L12ACZ L78L12ACZ-AP L78L12ACZ-TR L78L12ACUTR 12
L78L12CD13TR 12
L78L15ABZ-AP L78L15ABUTR 15
L78L15ACD13TR L78L15ACZ L78L15ACUTR 15
L78L15CD-TR 15
L78L18ACUTR 18
L78L18CD13TR 18
L78L24ABZ-TR 24
L78L24ACZ-AP L78L24ACUTR 24
L78L24CD-TR 24
1. Available in Ammopak with the suffix "-AP" or in tape and reel with the suffix "TR". Please note that in these cases pins are
shaped according to tape and reel specifications.

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Order codes
L78L Order codes
L78L

Table 29. Marking information

Part numbers Marking Packages Output voltages

L78L05ABD13TR 78L05B SO-8 5V

L78L05ABUTR 8C SOT-89 5V
L78L05ABZ L78L05A TO-92 5V
L78L05ABZ-AP L78L05A TO-92 5V
L78L05ABZ-TR L78L05A TO-92 5V
L78L05ACD13TR L78L05A SO-8 5V
L78L05ACUTR 8C SOT-89 5V
L78L05ACZ L78L05A TO-92 5V
L78L05ACZ-AP L78L05A TO-92 5V
L78L05ACZTR L78L05A TO-92 5V
L78L05CD13TR 78L05 SO-8 5V
L78L05CZ L78L05A TO-92 5V
L78L06ABUTR 8E SOT-89 6V
L78L06ABZ L78L06A TO-92 6V
L78L06ACD13TR L78L06A SO-8 6V
L78L06ACUTR 8E SOT-89 6V
L78L08ABD13TR 78L08B SO-8 8V
L78L08ABUTR 8G SOT-89 8V
L78L08ABZ-AP L78L08A TO-92 8V
L78L08ABZTR L78L08A TO-92 8V
L78L08ACD13TR 78L08A SO-8 8V
L78L08ACUTR 8G SOT-89 8V
L78L08ACZ L78L08A TO-92 8V
L78L08ACZ-AP L78L08A TO-92 8V
L78L08ACZTR L78L08A TO-92 8V
L78L08CD13TR 78L08 SO-8 8V
L78L09ABD13TR 78L09B SO-8 8V
L78L09ABZ L78L09A TO-92 9V
L78L09ABUTR 8H SOT-89 9V
L78L09ACD13TR 78L09A SO8 9V
L78L09ACUTR 8H SOT-89 9V
L78L09ACZ-AP L78L09A TO-92 9V
L78L09ACZ-TR L78L09A TO-92 9V

4343/ DocID2145 Rev 24 4343/

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Order codes
L78L Order codes
L78L

L78L09CD13TR L78L09A SO-8 9V

L78L10ACUTR 8I SOT-89 10 V

4444/ DocID2145 Rev 24 4444/

46 46
Order codes
L78L Order codes
L78L

Table 29. Marking information (continued)

Part numbers Marking Packages Output voltages

L78L12ABD-TR 78L12B SO-8 12 V

L78L12ABUTR 8K SOT-89 12 V
L78L12ABZ L78L12A TO-92 12 V
L78L12ABZ-AP L78L12A TO 92 12 V
L78L12ACD13TR 78L12A SO-8 12 V
L78L12ACUTR 8K SOT-89 12 V
L78L12ACZ L78L12A TO-92 12 V
L78L12ACZ-AP L78L12A TO-92 12 V
L78L12ACZ-TR L78L12A TO-92 12 V
L78L12CD13TR 78L12 SO-8 12 V
L78L15ABUTR 8L SOT-89 15 V
L78L15ABZ-AP L78L15A TO-92 15 V
L78L15ACD13TR 78L15A SO-8 15 V
L78L15ACUTR 8L SOT-89 15 V
L78L15ACZ L78L15A TO-92 15 V
L78L15CD-TR 78L15 SO-8 15 V
L78L18ACUTR 8B SOT-89 18 V
L78L18CD13TR L78L18 SO-8 18 V
L78L24ABZ-TR L78L24A TO-92 24 V
L78L24ACUTR 8P SOT-89 24 V
L78L24ACZ-AP L78L24A TO-92 24 V
L78L24CD-TR 78L24 SO-8 24 V
L78L33ABD-TR 78L33B SO-8 3.3 V
L78L33ABUTR 8A SOT-89 3.3 V
L78L33ABZ-AP L78L33A TO-92 3.3 V
L78L33ACD13TR 78L33A SO-8 3.3 V
L78L33ACUTR 8A SOT-89 3.3 V
L78L33ACZ L78L33A TO-92 3.3 V
L78L33ACZ-AP L78L33A TO-92 3.3 V
L78L33ACZTR L78L33A TO-92 3.3 V

4545/ DocID2145 Rev 24 4545/

46 46
L78L Revision history
L78L

9 Revision history

Table 30. Document revision history

Date Revision Changes

14-Mar-2005 9 Add tape and reel for TO-92.

15-Mar-2005 10 Add note on Table 3.
23-Dec-2005 11 Mistake on ordering Table in header.
12-Sep-2006 12 Order codes updated.
07-Jun-2007 13 Order codes updated.
18-Sep-2007 14 Added Table 1 in cover page.
15-Jul-2008 15 Modified: Table 1 and Table 28: Order codes.
18-Aug-2008 16 Modified Figure 12 on page 26.
03-Apr-2009 17 Added: RthJA value for SOT-89 Table 2 on page 5.
08-Feb-2011 18 Added note Table 26 on page 39
21-Feb-2012 19 Modified: SOT-89 Figure 2 on page 4.
Updated TOP value for L78L00AC in Table 1 on page 5.
14-Aug-2012 20
Minor text changes.
07-Sep-2012 21 Added: Table 29: Marking information.
Part numbers L78LxxAB, L78LxxAC, L78LxxC changed to L78L.
Removed Table1: Device summary.
Updated features and description in cover page, Table 28: Order
14-Apr-2014 22 codes, Table 29: Marking information and Section 7: Package
information.
Added Section : Packaging mechanical data.
Minor text changes.
Updated Table 28: Order codes and Table 29: Marking information.
06-Oct-2014 23
Minor text changes.
Updated Table 29: Marking information.
10-Feb-2015 24
Minor text changes.

4646/ DocID2145 Rev 24 4646/

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L78L Revision history
L78L

IMPORTANT NOTICE – PLEASE READ CAREFULLY

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© 2015 STMicroelectronics – All rights reserved

4747/ DocID2145 Rev 24 4747/

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