1N957B - 1N979B
Zener Diodes
Tolerance = 5%
DO-35 Glass case
COLOR BAND DENOTES CATHODE
Absolute Maximum Ratings *
Symbol
PD
TA = 25°C unless otherwise noted
Parameter
Power Dissipation
@ TL ≤ 75°C, Lead Length = 3/8”
Value
500
Units
mW
4.0
mW/°C
-65 to +200
°C
Derate above 75°C
TJ, TSTG
Operating and Storage Temperature Range
* These ratings are limiting values above which the serviceability of the diode may be impaired.
Electrical Characteristics
VZ (Volts)
Device
TA=25°C unless otherwise noted
ZZ (Ω)
(Note 1)
Min.
Typ.
Max.
@ IZ
(mA)
1N957B
1N958B
1N959B
1N960B
1N961B
6.46
7.125
7.79
8.645
9.5
6.8
7.5
8.2
9.1
10
7.14
7.875
8.61
9.555
10.5
18.5
16.5
15
14
12.5
1N962B
1N963B
1N964B
1N965B
1N966B
10.45
11.4
12.35
14.25
15.2
11
12
13
15
16
11.55
12.6
13.65
15.75
16.8
1N967B
1N968B
1N969B
1N970B
1N971B
17.1
19
20.9
22.8
25.652
18
20
22
24
27
1N972B
1N973B
1N974B
1N975B
1N976B
8.5
31.35
34.2
37.05
40.85
1N977B
1N978B
1N979B
44.65
48.45
53.2
ZZK @ IZK
IZM (mA)
μA
Volts
(Note 3)
4.5
5.5
6.5
7.5
8.5
Ω
700
700
700
700
700
mA
1.0
0.5
0.5
0.5
0.25
150
75
50
25
10
5.2
5.7
6.2
6.9
7.6
47
42
38
35
32
11.5
10.5
9.5
8.5
7.8
9.5
11.5
13
16
17
700
700
700
700
700
0.25
0.25
0.25
0.25
0.25
5
5
5
5
5
8.4
9.1
9.9
11.4
12.2
28
26
24
21
19
18.9
21
23.1
25.2
28.35
7.0
6.2
5.6
5.2
4.6
21
25
29
33
41
750
750
750
750
750
0.25
0.25
0.25
0.25
0.25
5
5
5
5
5
13.7
15.2
16.7
18.2
20.6
17
15
14
13
11
30
33
36
39
43
31.5
34.65
37.8
40.95
45.15
4.2
3.8
3.4
3.2
3.0
49
58
70
80
93
1000
1000
1000
1000
1500
0.25
0.25
0.25
0.25
0.25
5
5
5
5
5
22.8
25.1
27.4
29.7
32.7
10
9.2
8.5
7.8
7.0
47
51
56
49.35
53.55
58.8
2.7
2.5
2.2
105
125
150
1500
1500
2000
0.25
0.25
0.25
5
5
5
35.8
38.8
42.6
6.4
5.9
5.4
©2007 Fairchild Semiconductor Corporation
1N957B - 1N979B Rev. F1
Z Z @ IZ
IR @ V R
(Note 2)
1
www.fairchildsemi.com
1N957B - 1N979B Zener Diodes
June 2007
Top Mark Information
1N957B
1N958B
1N959B
1N960B
1N961B
Device
Line 1
LOGO
LOGO
LOGO
LOGO
LOGO
Line 2
57
58
59
60
61
Line 3
B
B
B
B
B
1N962B
1N963B
1N964B
1N965B
1N966B
LOGO
LOGO
LOGO
LOGO
LOGO
62
63
64
65
66
B
B
B
B
B
1N967B
1N968B
1N969B
1N970B
1N971B
LOGO
LOGO
LOGO
LOGO
LOGO
67
68
69
70
71
B
B
B
B
B
1N972B
1N973B
1N974B
1N975B
1N976B
LOGO
LOGO
LOGO
LOGO
LOGO
72
73
74
75
76
B
B
B
B
B
1N977B
1N978B
1N979B
LOGO
LOGO
LOGO
77
78
79
B
B
B
2
1N957B - 1N979B Rev. F1
www.fairchildsemi.com
1N957B - 1N979B Zener Diodes
Notes:
1. Zener Voltage (VZ) Measurement
Nominal zener voltage is measured with the device junction in the thermal equilibrium at the lead temperature (TL) at 30°C ± 1°C and 3/8” lead length.
2. Zener Impedance (ZZ) Derivation
ZZT and ZZK are measured by dividing the ac voltage drop across the device by the ac current applied. The specified limits are for IZ(ac) = 0.1 IZ(dc) with the ac frequency = 60Hz.
3. Maximum Zener Current Ratings (IZM)
The maximum current handling capability on a worst case basis is limited by the actual zener voltage at the operation point and the power derating curve.
1N957B - 1N979B Zener Diodes
Top Mark Information (Continued)
1st line: F - Fairchild Logo
F
22
2nd line: Device Name - 4th to 5th characters of the device name.
or 5th to 6th characters for BZXyy series
9B
3rd line: Device Name - 6th to 7th characters of the device name.
or Voltage rating for BZXyy series
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2.0 First Line: F - Fairchild Logo
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For BZXyy series: Voltage rating
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3
1N957B - 1N979B Rev. F1
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Advance Information
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Rev. I23
4
1N957B - 1N979B Rev. F1
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1N957B - 1N979B Zener Diodes
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