1N957B - 1N979B Zener Diodes
June 2007
1N957B - 1N979B
Zener Diodes
Tolerance = 5%
DO-35 Glass case
COLOR BAND DENOTES CATHODE
Absolute Maximum Ratings *
Symbol
P
D
T
A
= 25°C unless otherwise noted
Parameter
Power Dissipation
@ TL
≤
75°C, Lead Length = 3/8”
Derate above 75°C
Operating and Storage Temperature Range
Value
500
4.0
-65 to +200
Units
mW
mW/°C
°C
T
J
, T
STG
* These ratings are limiting values above which the serviceability of the diode may be impaired.
Electrical Characteristics
V
Z
(Volts)
Device
1N957B
1N958B
1N959B
1N960B
1N961B
1N962B
1N963B
1N964B
1N965B
1N966B
1N967B
1N968B
1N969B
1N970B
1N971B
1N972B
1N973B
1N974B
1N975B
1N976B
1N977B
1N978B
1N979B
Min.
6.46
7.125
7.79
8.645
9.5
10.45
11.4
12.35
14.25
15.2
17.1
19
20.9
22.8
25.652
8.5
31.35
34.2
37.05
40.85
44.65
48.45
53.2
Typ.
6.8
7.5
8.2
9.1
10
11
12
13
15
16
18
20
22
24
27
30
33
36
39
43
47
51
56
T
A
=25°C unless otherwise noted
(Note 1)
Z
Z
(Ω)
@ I
Z
(mA)
18.5
16.5
15
14
12.5
11.5
10.5
9.5
8.5
7.8
7.0
6.2
5.6
5.2
4.6
4.2
3.8
3.4
3.2
3.0
2.7
2.5
2.2
Z
Z
@ I
Z
4.5
5.5
6.5
7.5
8.5
9.5
11.5
13
16
17
21
25
29
33
41
49
58
70
80
93
105
125
150
(Note 2)
I
R
@ V
R
mA
1.0
0.5
0.5
0.5
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
μA
150
75
50
25
10
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
Volts
5.2
5.7
6.2
6.9
7.6
8.4
9.1
9.9
11.4
12.2
13.7
15.2
16.7
18.2
20.6
22.8
25.1
27.4
29.7
32.7
35.8
38.8
42.6
Max.
7.14
7.875
8.61
9.555
10.5
11.55
12.6
13.65
15.75
16.8
18.9
21
23.1
25.2
28.35
31.5
34.65
37.8
40.95
45.15
49.35
53.55
58.8
Z
ZK
@ I
ZK
Ω
700
700
700
700
700
700
700
700
700
700
750
750
750
750
750
1000
1000
1000
1000
1500
1500
1500
2000
I
ZM
(mA)
(Note 3)
47
42
38
35
32
28
26
24
21
19
17
15
14
13
11
10
9.2
8.5
7.8
7.0
6.4
5.9
5.4
©2007 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
1N957B - 1N979B Rev. F1
1N957B - 1N979B Zener Diodes
Notes:
1. Zener Voltage (V
Z
) Measurement
Nominal zener voltage is measured with the device junction in the thermal equilibrium at the lead temperature (T
L
) at 30°C ± 1°C and 3/8” lead length.
2. Zener Impedance (Z
Z
) Derivation
Z
ZT
and Z
ZK
are measured by dividing the ac voltage drop across the device by the ac current applied. The specified limits are for I
Z(ac)
= 0.1 I
Z(dc)
with the ac frequency = 60Hz.
3. Maximum Zener Current Ratings (I
ZM
)
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.
Top Mark Information
Device
1N957B
1N958B
1N959B
1N960B
1N961B
1N962B
1N963B
1N964B
1N965B
1N966B
1N967B
1N968B
1N969B
1N970B
1N971B
1N972B
1N973B
1N974B
1N975B
1N976B
1N977B
1N978B
1N979B
Line 1
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
Line 2
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
Line 3
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
2
1N957B - 1N979B Rev. F1
www.fairchildsemi.com
1N957B - 1N979B Zener Diodes
Top Mark Information
(Continued)
22
9B
F
1
st
line: F - Fairchild Logo
2
nd
line: Device Name - 4
th
to 5
th
characters of the device name.
or 5
th
to 6
th
characters for BZXyy series
3
rd
line: Device Name - 6
th
to 7
th
characters of the device name.
or Voltage rating for BZXyy series
General Requirements:
1.0 Cathode Band
2.0 First Line: F - Fairchild Logo
3.0 Second Line: Device name - For 1Nxx series: 4
th
to 5
th
characters of the device name.
For BZxx series: 5
th
to 6
th
characters of the device name.
4.0 Third Line: Device name - For 1Nxx series: 6
th
to 7
th
characters of the device name.
For BZXyy series: Voltage rating
5.0 Devices shall be marked as required in the device specification (PID or FSC Test Spec).
6.0 Maximum no. of marking lines: 3
7.0 Maximum no. of digits per line: 2
8.0 FSC logo must be 20 % taller than the alphanumeric marking and should occupy the 2 characters of the specified line.
9.0 Marking Font: Arial (Except FSC Logo)
10.0 First character of each marking line must be aligned vertically.
11.0 All device markings must be based on Fairchild device specification.
3
1N957B - 1N979B Rev. F1
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1N957B - 1N979B Zener Diodes
1N957B - 1N979B Zener Diodes
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Rev. I23
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Full Production
Obsolete
Not In Production
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