VDE ST

1a1b/2a 8A polarized power

relays ST RELAYS
2. High switching capability 6. Automatic cleaning possible
High contact pressure, low contact The sealed design means that these
bounce, and forced separation relays can undergo immersion in
structure that radically improves automatic washing systems and are
resistance to contact welding suitable for automatic soldering. Even
(1 Form A 1 Form B type equivalent to in difficult environments, the contacts
TV-3). Strong against lamp inductive remain reliable.
loads, maximum switching capacity 7. Easy to design PC board patterns
has reached 3,040 VA (8A 380V AC). Features 4/10 dual-in-line terminals.
3. High breakdown voltage – Optimal Because the lead spacing has a pitch
for control in 250 V power circuits greater than 7.54 mm .297 inch,
Compliance with RoHS Directive High breakdown voltage has been designers can make easy adjustments
achieved. Between contacts and coil of with the width of the land size. This,
3,750 Vrms; Surge breakdown voltage along with the large insulation
between coil and contact of 6,000 V, distance, simplifies the drawing of PC
and between open contacts of 1,200 board patterns.
Vrms mean that these relays are 8. To improve soldering efficiency,
suitable even for 250 V power circuit preapplication of solder to the
control. terminals is recommended.
4. Improved stability 9. Sockets are available.
Conforms to all types of safety
FEATURES standards.
1. Even with small form factor, Insulating distance of more than 3 mm
sensitive enough for direct IC- secured. Complies with Japan
driving Electrical Appliance and Material
The dimensions of this high-density 4- Safety Law requirements for operating
gap balanced armature are 31 mm × 200 V power supply circuits, and
14 mm × 11 mm 1.220 inch × .551 inch conforms with UL, CSA and VDE
× .433 inch. Despite this small size, standards.
high sensitivity is achieved by a 5. Latching types available
mechanism that incorporates high- In addition to single side stable types,
efficiency polarized magnetic circuits convenient 2 coil latching types with
along with our exclusive spring memory functions are also available.
alignment method. With an minimum Moreover, we offer 2 Form A
operating power of about 150 mW, specifications which, with double pole
nominal operating power of 240 mW, switching for applications such as 250
this relay can be directly driven by V power circuit switching, can enable
transistor or chip controllers. safer designs.

ORDERING INFORMATION
ST F
Contact arrangement
1: 1 Form A 1 Form B
2: 2 Form A
Operating function
Nil: Single side stable
L2: 2 coil latching
Nominal coil voltage
DC 3, 5, 6, 9, 12, 24, 48 V
Contact material
F: AgSnO2 type contact
Note: Certified by UL, CSA, VDE and SEV

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TYPES
Single side stable 2 coil latching
Contact arrangement Nominal coil voltage
Part No. Part No.
3V DC ST1-DC3V-F ST1-L2-DC3V-F
5V DC ST1-DC5V-F ST1-L2-DC5V-F
6V DC ST1-DC6V-F ST1-L2-DC6V-F
1 Form A 1 Form B 9V DC ST1-DC9V-F ST1-L2-DC9V-F
12V DC ST1-DC12V-F ST1-L2-DC12V-F
24V DC ST1-DC24V-F ST1-L2-DC24V-F
48V DC ST1-DC48V-F ST1-L2-DC48V-F
3V DC ST2-DC3V-F ST2-L2-DC3V-F
5V DC ST2-DC5V-F ST2-L2-DC5V-F
6V DC ST2-DC6V-F ST2-L2-DC6V-F
2 Form A 9V DC ST2-DC9V-F ST2-L2-DC9V-F
12V DC ST2-DC12V-F ST2-L2-DC12V-F
24V DC ST2-DC24V-F ST2-L2-DC24V-F
48V DC ST2-DC48V-F ST2-L2-DC48V-F
Standard packing: Carton: 50 pcs.; Case: 500 pcs.
* For sockets, see page 125.

RATING
1. Coil data
1) Single side stable
Nominal operating
Nominal coil Pick-up voltage Drop-out voltage Coil resistance Nominal operating Max. applied voltage
current
voltage (at 20°C 68°F) (at 20°C 68°F) [±10%] (at 20°C 68°F) power (at 20°C 68°F)
[±10%] (at 20°C 68°F)
3V DC 75mA 38Ω
5V DC 47mA 105Ω
6V DC 80%V or less of 10%V or more of 40mA 150Ω
150%V of
9V DC nominal voltage nominal voltage 25mA 360Ω 240mW
nominal voltage
12V DC (Initial) (Initial) 20mA 600Ω
24V DC 10mA 2,400Ω
48V DC 4.7mA 9,000Ω

2) 2 coil latching
Nominal operating
Coil resistance Nominal operating
Nominal coil Set voltage Reset voltage current Max. applied voltage
[±10%] (at 20°C 68°F) power
voltage (at 20°C 68°F) (at 20°C 68°F) [±10%] (at 20°C 68°F) (at 20°C 68°F)
Set coil Reset coil Set coil Reset coil Set coil Reset coil
3V DC 75mA 75mA 40Ω 40Ω
5V DC 45mA 45mA 110Ω 110Ω
6V DC 80%V or less of 80%V or less of 37.5mA 37.5mA 155Ω 155Ω
150%V of
9V DC nominal voltage nominal voltage 25mA 25mA 360Ω 360Ω 240mW 240mW
nominal voltage
12V DC (Initial) (Initial) 18.8mA 18.8mA 640Ω 640Ω
24V DC 10mA 10mA 2,400Ω 2,400Ω
48V DC 4.7mA 4.7mA 10,200Ω 10,200Ω

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2. Specifications
Characteristics Item Specifications
Arrangement 1 Form A 1 Form B, 2 Form A
Contact Contact material Au-flashed AgSnO2 type
Contact resistance (Initial) Max. 30 mΩ (By voltage drop 6 V DC 1A)
Max. switching power (resistive load) 3,040 VA, 150 W
Max. switching voltage 380 V AC, 250 V DC
Max. switching current 8A
Rating
Minimum operating power 150mW (Single side stable, 2 coil latching)
Nominal operating power 240mW (Single side stable, 2 coil latching)
Min. switching capacity (Reference value)*1 100 mA 5V DC
Insulation resistance (Initial) Min. 1,000MΩ (at 500V DC)
(at 25°C, 50% relative humidity) Measurement at same location as “Breakdown voltage” section.
Between open contacts 1,200 Vrms for 1 min. (Detection current: 10 mA)
Breakdown voltage
Between contact sets 2,000 Vrms for 1 min. (Detection current: 10 mA)
(Initial)
Between contact and coil 3,750 Vrms for 1 min. (Detection current: 10 mA)
Electrical Surge breakdown voltage (Initial)*2 6,000 V (Between contact and coil)
characteristics
Max. 15 ms [Max. 15 ms]
Operate time [Set time] (at 20°C 68°F)
(Nominal coil voltage applied to the coil, excluding contact bounce time.)
Max. 10 ms [Max. 15 ms]
Release time [Reset time] (at 20°C 68°F)
(Nominal coil voltage applied to the coil, excluding contact bounce time.) (without diode)
Max. 55°C
Temperature rise (coil) (at 60°C 140°F)
(By resistive method, nominal voltage applied to the coil; contact carrying current: 8A.)
Functional Min. 196 m/s2 (Half-wave pulse of sine wave: 11 ms; detection time: 10µs.)
Shock resistance
Mechanical Destructive Min. 980 m/s2 (Half-wave pulse of sine wave: 6 ms.)
characteristics Functional 10 to 55 Hz at double amplitude of 2 mm (Detection time: 10µs.)
Vibration resistance
Destructive 10 to 55 Hz at double amplitude of 3 mm
Mechanical Min. 107 (at 180 times/min.)
Expected life
Electrical Min. 105 (8 A 250 V AC resistive) (ON : OFF = 1 s : 5 s)
Ambient temperature: –40°C to +60°C –40°F to +140°F;
Conditions for operation, transport and storage*3
Conditions Humidity: 5 to 85% R.H. (Not freezing and condensing at low temperature)
Max. operating speed 30 cps
Unit weight Approx. 10g .353 oz
Notes: *1. This value can change due to the switching frequency, environmental conditions, and desired reliability level, therefore it is recommended to check this with the
actual load.
*2. Wave is standard shock voltage of ±1.2×50µs according to JEC-212-1981
*3. The upper limit of the ambient temperature is the maximum temperature that can satisfy the coil temperature rise value. Refer to Usage, transport and storage
conditions in NOTES.

REFERENCE DATA
1. Max. switching power 2. Coil temperature rise 3. Influence of adjacent mounting

10 100 40
AC resistive
load 90 30
5
Temperature rise, °C

Rated of change, %

AC inductive 80
load 20
(cosϕ=0.4) 70
Current, A

2 Drop-out voltage
60 Contact current 8A 10

1 50 0
40 0A Pick-up voltage
0.5 -10
DC resistive load
30
-20
20
0.2
10 -30

0 -40
0 20 50 100 200 300 600 1000 0.2 0.4 0.6 0.8 1.0 1.2 5 10 15 20
Voltage, V Coil operating power, W Inter-relay distance, mm

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DIMENSIONS (mm inch) The CAD data of the products with a CAD Data mark can be downloaded from: http://panasonic-electric-works.net/ac

CAD Data External dimensions PC board pattern (Bottom view)

31.0 14 2 coil latching
1.220 .551 types only.

11.0
.433
0.3
.012
3.5 .138 2.54
.100
7.62 10.16 7.62 10.16
.300 .400 .300 .400 8-1.4 dia.
0.3 .012 8-.055 dia. 2.54
1.0 .100
.039 0.6 dia. .024 dia.

Tolerance: ±0.1 ±.004

1 2 3 4
8 7 6 5
0.5
.020
1.0 1.0
.039 .039

General tolerance: ±0.5 ±.020

Schematic (Bottom view)

Single side stable 2 coil latching
1 Form A 1 Form B 2 Form A 1 Form A 1 Form B 2 Form A
1 4 1 4 1 2 3 4 1 2 3 4
– + – + – + + – – + + –

8 7 6 5 8 7 6 5 8 7 6 5 8 7 6 5

(Deenergized condition) (Reset condition)

SAFETY STANDARDS
UL/C-UL (Recognized) CSA (Certified) VDE (Certified) TV rating (UL/CSA) SEV
File No. Contact rating File No. Contact rating File No. Contact rating File No. Rating File No. Contact rating
E43028 8A 250V AC LR26550 8A 250V AC 1017 8A 250V AC (cosφ =1.0) UL: E43028 98-1 10289 8A 380V AC
1/4HP 125, 250V AC etc. 1/4HP 125, 250V AC 4A 250V AC (cosφ =0.4) CSA: LR26550 —
5A 30V DC 5A 30V DC 5A 30V DC

NOTES
1. PC board patterns for 2 coil latching 2. Soldering should be done under the 3. When using, please be aware that
types following conditions: the a contact and b contact sides of 1
When applying relays in power supply 1) Form A and 1 Form B types may go on
operation circuits for finished products 250°C 482°F within 10s simultaneously at operate time and
regulated by the Electrical Appliance and 300°C 572°F within 5s release time.
Material Safety Law, use the pattern 350°C 662°F within 3s
shown below. 2) For automatic cleaning, the boiling
method is recommended. Avoid
ultrasonic cleaning which subjects the
relays to high frequency vibrations, which
may cause the contacts to stick.
Terminal No. 1 2 3 4
It is recommended that a fluorinated
hydrocarbon or other alcoholic solvents
be used.

For Cautions for Use.

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 ST
VDE

ACCESSORIES
ST RELAYS
SOCKET
ST relay socket 2. Easy design of PC board pattern 3. High breakdown voltage.
(2.54 mm x 4 pitch DIL terminal array)

SPECIFICATIONS
Item Specifications
Between contact and coil: 4,000 Vrms for 1 min. (Detection current: 10 mA)
Breakdown voltage (Initial)
Between contact and terminal: 2,000 Vrms for 1 min.
Insulation resistance (Initial) Min. 1,000 MΩ between terminals (500V DC)
ST-PS Heat resistance 150°C 302°F for 1 hr
PC board terminal socket Max. continuous current 10 A
Relay insertion life 15 times

DIMENSIONS (mm inch) The CAD data of the products with a CAD Data mark
can be downloaded from: http://panasonic-electric-works.net/ac
ST-PS CAD Data ST-SS CAD Data
4 4
.158 .158
16.4 16.4
ST-SS .646 .646
0.3
Solder terminal socket 0.3
.012 .012
4.3 5.5 5.3 5.5
.169 10.16 .217 .209 10.16 .217
1.05 0.27 .400 .400
2.3 0.27
Compliance with RoHS Directive 10.16
.400
.041 .011 14.6
.575 .090 .011
14.6
7.62 7.62 10.16 .575
.300 .300 .400
31.6 7.62 7.62
1.244 .300 .300
31.6
1.244
35.4 35.4
FEATURES 1.394 1.394

1. Possible to fit or remove the chassis 8 7 6 5 8 7 6 5

16.6 16.6
with one touch (t = 0.6 mm to 2.2 .654 .654
mm .024 inch to .087 inch) 1 2 3 4 1 2 3 4

PRECAUTIONS FOR USE (SOCKET)

1. PC board mounting method 2. Chassis cutout 3. Relay mounting and removal
PC board pattern Chassis cutting dimensions (1) Align the directions of the relay and
socket. Relay
Contact 8 7 6 5
terminal 15.0±0.2
interval .591±.008

Coil 32.5±0.1
terminal 2.54 1.280±.004
1 2 3 4 .100
interval
8-1.5 dia. Press Claw for chassis
8-.060 dia. 2.54 fastening
.100 A side (2) Insert the relay all the way in, so it is
The terminal configuration is symmetrical securely in place.
on the left and right, so an arrow mark
is stamped on the socket to prevent mis- Chassis t = 0.6 to 2.2
.024 to .087
insertion. We recommend printing the Hinge
same arrow mark on the component If the chassis hole is punched with a mechanism

mounting side (side opposite from press, set so the release R on the front
pattern) of the PC board. In this case, the side (A side).
(3) Press the part indicated by A in the B
terminal configuration becomes the The range for chassis thickness is 0.6 to
direction, and fasten by placing the hook
terminal nos. noted near the drilling 2.2 mm .024 to .087 inch.
on the relay.
holes.

Relay case
cross-section
A
B

(Before fastening) (Fastening complete)

(4) When removing the relay, completely

release the hooks on both sides and pull
the relay out.

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