©2007 Fairchild Semiconductor Corporation 1www.fairchildsemi.com
1N957B - 1N979B Rev. F1
1N957B - 1N979B Zener Diodes
June 2007
1N957B - 1N979B
Zener Diodes
Absolute Maximum Ratings * TA = 25°C unless otherwise noted
* These ratings are limiting values above which the serviceability of the diode may be impaired.
Electrical Characteristics TA=25°C unless otherwise noted
Symbol Parameter Value Units
PDPower Dissipation
@ TL ≤ 75°C, Lead Length = 3/8” 500 mW
Derate above 75°C4.0 mW/°C
TJ, TSTG Operating and Storage Temperature Range -65 to +200 °C
Device VZ (Volts) (Note 1) ZZ (Ω) (Note 2) IR @ VRIZM (mA)
(Note 3)
Min. Typ. Max. @ IZ
(mA) ZZ @ IZZZK @ IZK μAVolts
ΩmA
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
4.5
5.5
6.5
7.5
8.5
700
700
700
700
700
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
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
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
1N967B
1N968B
1N969B
1N970B
1N971B
17.1
19
20.9
22.8
25.652
18
20
22
24
27
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
1N972B
1N973B
1N974B
1N975B
1N976B
8.5
31.35
34.2
37.05
40.85
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
1N977B
1N978B
1N979B
44.65
48.45
53.2
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
DO-35 Glass case
COLOR BAND DENOTES CATHODE
Tolerance = 5%
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1N957B - 1N979B Rev. F1
1N957B - 1N979B Zener Diodes
Notes:
1. Zener Voltage (VZ) Measurement
Nominal zener voltage is mea s ured with the device junction in the thermal equ ilibrium at the lead temperatu re (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 freq uency = 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.
Top Mark Information
Device Line 1 Line 2 Line 3
1N957B
1N958B
1N959B
1N960B
1N961B
LOGO
LOGO
LOGO
LOGO
LOGO
57
58
59
60
61
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
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1N957B - 1N979B Rev. F1
1N957B - 1N979B Zener Diodes
Top Mark Information (Continued)
General Requirements:
1.0 Cathode Band
2.0 First Line: F - Fairchild Logo
3.0 Second Line: Device name - For 1Nxx series: 4th to 5th characters of the device name.
For BZxx series: 5th to 6th characters of the device name.
4.0 Third Line: Device name - For 1Nxx series: 6th to 7th 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.
F
22
9B
1st line: F - Fairchild Logo
2nd line: Device Name - 4th to 5th characters of the device name.
or 5th to 6th characters for BZXyy series
3rd line: Device Name - 6th to 7th characters of the device name.
or Voltage rating for BZXyy series
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to
be an exhaustive list of all such trademarks.
1N957B - 1N979B Zener Diodes
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO
IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE
OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE
RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPE-
CIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEV ICES OR SYSTEMS W ITHOUT
THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems which, (a) are
intended for surgical impla nt into the body, or (b) support or susta in life, or
(c) whose failure to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected
to result in significant injury to the user.
2. A critical component is any component of a life supp ort device or system
whose failure to perform can be reason ably expected to cause the failure
of the life support device o r system, or to affe ct its safet y or eff ectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification Product Status Definition
Advance Information Formative or In Design This datasheet contains the design specifications for product develop-
ment. Specifications may change in any manner without notice.
Preliminary First Production This datasheet contains preliminary data, and supplementary data will
be published at a lat er date. Fairchil d Semiconducto r reserves th e right
to make changes at any time without notice in order to improve design.
No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor
reserves the right to make changes at any time without notice in order
to improve design.
Obsolete Not In Production This datasheet contains specifications on a product that has been dis-
continued by Fairchild semiconductor.The datasheet is printed for ref-
erence information only.
GTO™
HiSeC™
i-Lo™
ImpliedDisconnect™
IntelliMAX™
ISOPLANAR™
MICROCOUPLER™
MicroPak™
MICROWIRE™
MSX™
MSXPro™
OCX™
OCXPro™
OPTOLOGIC®
OPTOPLANAR™®
PACMAN™
POP™
Power220®
Power247®
PowerEdge™
PowerSaver™
PowerTrench®
Programmable Active Droop™
QFET®
QS™
QT Optoelectronics™
Quiet Series™
RapidConfigure™
RapidConnect™
ScalarPump™
SMART START™
SPM™
SuperFET™
SuperSOT™-3
SuperSOT™-6
SuperSOT™-8
TCM™
The Power Franchise®
TinyBoost™
TinyBuck™
TinyLogic®
TINYOPTO™
TinyPower™
TinyWire™
TruTranslation™
μSerDes™
UHC®
UniFET™
VCX™
Wire™
ACEx™
Across the board. Around the world.™
ActiveArray™
Bottomless™
Build it Now™
CoolFET™
CROSSVOLT™
CTL™
Current Transfer Logic™
DOME™
E2CMOS™
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FACT Quiet Series™
FACT®
FAST®
FASTr™
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Rev. I23
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1N957B - 1N979B Rev. F1
1N957B - 1N979B Zener Diodes
