MCC 1N957

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21201 Itasca Street Chatsworth
 1N978
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• Zener Voltage 6.8V to 51V 0.5W Silicon Planar
• Silicon Planar Power Zener Diodes
• Standards zener voltage tolerance is ±20%, Add suffix “A” for Zener Diodes
±10% tolerance and suffix “B” for ±5% tolerance, non standards
and higher zener voltage upon request

0HFKDQLFDO'DWD DO-35
• Case: DO-35 glass case
• Polarity: Color band denotes cathode end
• Weight: Approx. 0.13 gram
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Symbol Value Units A
Cathode
Zener Current See Table 1 Mark
Power Dissipation
Ptot 500 mW
@ TA=25oC B

o
Junction Temperature TJ 175 C D
Storage Temperature o
TSTG -65 to 175 C
Range

C
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Symbol Maximum Unit
o
Thermal resistance R-$ 300 C/W
Forward Voltage
VF 1.5 V
@ IF=200mA
NOTE: DIMENSIONS

Valid provided that a distance of 8mm from case are kept at INCHES MM
DIM MIN MAX MIN MAX NOTE
ambient temperature A --- .166 --- 4.2
B --- .079 --- 2.00
C --- .020 --- .52
D 1.000 --- 25.40 ---

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1N957 thru 1N978 MCC
ZENER
MAXIMUM REVERSE MAXIMUM
VOLTAGE3) MAXIMUM ZENER TYPICAL
MCC LEAKAGE CURRENT ZENER
@TEST IMPEDANCE1) TEMP.
PART TEST-VOLTAGE CURRENT
CURRENT COEFFICIENT
NUMBER
VZ IZT ZZT ZZK IZK IR2) Suffix A Suffix B IZM2)
V mA mA A V V mA %/ :
1N957 6.8 18.5 4.5 700 1.0 150 4.9 5.2 47 0.050
1N958 7.5 16.5 5.5 700 0.5 75 5.4 5.7 42 0.058
1N959 8.2 15 5.5 700 0.5 50 5.9 6.2 38 0.062
1N960 9.1 14 5.5 700 0.5 10 6.6 6.9 35 0.068
1N961 10 12.5 5.5 700 0.25 5 7.2 7.6 32 0.075
1N962 11 11.5 5 700 0.25 5 8.0 8.4 28 0.076
1N963 12 10.5 11.5 700 0.25 5 8.6 9.1 26 0.077
1N964 13 9.5 13 700 0.25 5 9.4 9.9 24 0.079
1N965 15 8.5 16 700 0.25 5 10.8 11.4 21 0.082
1N966 16 7.8 17 700 0.25 5 11.5 12.2 19 0.083
1N967 18 7.0 21 750 0.25 5 13.0 13.7 17 0.085
1N968 20 6.2 25 750 0.25 5 14.4 15.2 15 0.086
1N969 22 5.6 29 750 0.25 5 15.8 16.7 14 0.087
1N970 24 5.2 33 750 0.25 5 17.3 18.2 14 0.088
1N971 27 4.6 41 750 0.25 5 19.4 20.6 11 0.090
1N972 30 4.2 49 1000 0.25 5 21.6 22.8 10 0.091
1N973 33 3.8 58 1000 0.25 5 23.8 25.1 9.0 0.092
1N974 36 3.4 70 1000 0.25 5 25.9 27.4 8.5 0.093
1N975 39 3.2 80 1000 0.25 5 28.1 29.7 7.8 0.094
1N976 43 3.0 93 1500 0.25 5 31.0 32.7 7.0 0.095
1N977 47 2.7 105 1500 0.25 5 33.8 35.8 6.4 0.095
1N978 51 2.5 125 1500 0.25 5 36.7 38.8 5.9 0.096

Note:
1) The Zener impedance is derived from the 1kHz AC voltage which results when an AC current having an RMS
value equal to 10% of the Zener current (IZT) is superimposed on IZT Zener impedance is measured at two points
to insure a sharp knee on the breakdown curve and to eliminate unstable units.
2) Valid provided that leads are kept at ambient temperature at a distance of 8mm from case.
3) Measured with device junction in thermal equilibrium.

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