1N957B~1N982B
Excel Semiconductor
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Zener diode
Features
1. High reliability
2. Very sharp reverse characteristi c
3. Zener voltage 6.8V to 75V
4. VZ-tolerance±5%
Applications
Voltage st abili zation
Absolute Maximum Ratings
Tj=25℃ Parameter Test Conditions Type Symbol Value Unit
Power dissipation Tamb≤75℃ P
V 500 mW
Z-current IZ PV/VZ mA
Junction temperature Tj 200 ℃
Storage temperature range Tstg -65~+200 ℃
Maximum Thermal Resistance
Tj=25℃ Parameter Test Conditions Symbol Value Unit
Junction ambient I=9.5mm(3/8”) T L=constant RthJA 300 K/W
Electrical Characteristics
Tj=25℃ Parameter Test Conditions Type Symbol Min Typ Max Unit
Forward voltage IF=200mA VF 1.5 V
1N957B~1N982B
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VZnom1) IZT for V
ZT and ZZT ZZK at I
ZK IR at VR IZM2) Type V mA V1) Ω Ω mA μA V mA
1N957B 6.8 18.5 6.46~7.14 4.5 700 1.0 150 5.2 47
1N958B 7.5 16.5 7.125~7.875 5.5 700 0.5 75 5.7 42
1N959B 8.2 15 7.79~8.61 6.5 700 0.5 50 6.2 38
1N960B 9.1 14 8.645~9.555 7.5 700 0.5 25 6.9 35
1N961B 10 12.5 9.5~10.5 8.5 700 0.25 10 7.6 32
1N962B 11 11.5 10.45~11.55 9.5 700 0.25 5 8.4 28
1N963B 12 10.5 11.4~12.6 11.5 700 0.25 5 9.1 26
1N964B 13 9.5 12.35~13.65 13 700 0.25 5 9.9 24
1N965B 15 8.5 14.25~15.75 16 700 0.25 5 11.4 21
1N966B 16 7.8 15.2~16.8 17 700 0.25 5 12.2 19
1N967B 18 7.0 17.1~18.9 21 750 0.25 5 13.7 17
1N968B 20 6.2 19~21 25 750 0.25 5 15.2 15
1N969B 22 5.6 20.9~23.1 29 750 0.25 5 16.7 14
1N970B 24 5.2 22.8~25.2 33 750 0.25 5 18.2 13
1N971B 27 4.6 25.6~28.35 41 750 0.25 5 20.6 11
1N972B 30 4.2 28.5~31.5 49 1000 0.25 5 22.8 10
1N973B 33 3.8 31.35~34.65 58 1000 0.25 5 25.1 9.2
1N974B 36 3.4 34.2~37.8 70 1000 0.25 5 27.4 8.5
1N975B 39 3.2 37.05~40.95 80 1000 0.25 5 29.7 7.8
1N978B 51 2.5 48.45~53.55 125 1500 0.25 5 38.8 5.9
1N979B 56 2.2 53.2~58.8 150 2000 0.25 5 42.6 5.4
1N982B 75 1.7 71.25~78.75 270 2000 0.25 5 56 4.1
1) Tolerance and v oltage designation(Vz):
The type numbers shown have a standard tolerance of ±5% on the nominal zener voltage, C for ±2%, D
for ±1%.
2) Maximum zener current ratings(IZM):
Maximum zener current ratings are based on maximum zener voltage of the individual units and JEDEC
250 mW rating.
1N957B~1N982B
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Characteristics (Tj=25℃ unless otherwise specified)
Figure 1. Typical Thermal Resistance Figure 2. Typical Forward Characteristics
Figure 3. Temperature coefficients
(-55℃ to +150℃ temperature range; 90% of the units are in the ranges indicated.)
Figure 4. Effect of zener current on zener impedance Figure 5. Effect of zener voltage on zener imped a nce
1N957B~1N982B
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Figure 6. Zener Voltage versus Zener Current – Vz=1 thru 16 Volts
Figure 7. Zener Voltage versus Zener Current – Vz=15 thru 30 Volts
1N957B~1N982B
Excel Semiconductor
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Figure 8. Zener Voltage versus Zener Current – Vz=30 thru 75 Volts
1N957B~1N982B
Excel Semiconductor
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Dimensions in mm
Standard Glass Case
JEDEC DO 35
Marking
Cathode Anode
26 min. 26 min. 4.2 max.
φ0.55 max.
φ2.0 max.
Cathode identification Type No.
1
9 N
5
N
5
B
1
9
8