Zeners 1N957B - 1N991B
Zeners
1N957B - 1N991B
Absolute Maximum Ratings *
Symbol
P
D
Parameter
Power Dissipation
@ TL
≤
75°C, Lead Length = 3/8”
Derate above 75°C
T
J
, T
STG
Operating and Storage Temperature Range
T
A
= 25°C unless otherwise noted
Tolerance = 5%
Units
mW
mW/°C
°C
Value
500
4.0
-65 to +200
* These ratings are limiting values above which the serviceability of the diode may be impaired.
DO-35 Glass case
COLOR BAND DENOTES CATHODE
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
1N980B
1N981B
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
58.9
64.6
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
62
68
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
2.0
1.8
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
185
230
(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
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
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
47.1
51.7
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
65.1
71.4
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
2000
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
4.9
4.5
©2004 Fairchild Semiconductor Corporation
1N957B - 1N991B, Rev. E2
Zeners 1N957B - 1N991B
Electrical Characteristics
(Continued)
V
Z
(Volts)
Device
1N982B
1N983B
1N984B
1N985B
1N986B
1N987B
1N988B
1N989B
1N990B
1N991B
Min.
71.25
77.9
86.45
95
104.5
114
123.5
142.5
152
171
Typ.
75
82
91
100
110
120
130
150
160
180
(Note 1)
T
A
=25°C unless otherwise noted
Z
Z
(Ω)
@ I
Z
1.7
1.5
1.4
1.3
1.1
1.0
0.95
0.85
0.80
0.68
Z
Z
@ I
Z
270
330
400
500
750
900
1100
1500
1700
2200
(Note 2)
I
R
@ V
R
mA
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
µA
5
5
5
5
5
5
5
5
5
5
Volts
56.0
62.2
69.2
76.0
83.6
91.2
98.8
114
121.6
136.8
Max.
78.75
86.1
95.55
105
115.5
126
136.5
157.5
168
189
Z
ZK
@ I
ZK
Ω
2000
3000
3000
3000
4000
4500
5000
6000
6500
7100
I
ZM
(mA)
(Note 3)
4.1
3.7
3.3
3.0
2.7
2.5
2.3
2.0
1.9
1.7
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.
©2004 Fairchild Semiconductor Corporation
1N957B - 1N991B, Rev. E2
Zeners 1N957B - 1N991B
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
1N980B
1N981B
1N982B
1N983B
1N984B
1N985B
1N986B
1N987B
1N988B
1N989B
1N990B
1N991B
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
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
LOGO
Line 2
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
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
B
B
B
B
B
B
B
B
B
B
B
B
Line 4
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
XY
©2004 Fairchild Semiconductor Corporation
1N957B - 1N991B, Rev. E2
Zeners 1N957B - 1N991B
Top Mark Information
(Continued)
F
1
st
line: F - Fairchild Logo
2
nd
line: Device Name - 3
rd
to 5
th
characters of the device name.
or 4
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
4
th
line: Device Code or - Two Digit - Six Weeks Date Code.
Date code plus or Two Digit - Six Weeks Date Code
Large die identification plus Large die identification, “L”
522
9B
XY
General Requirements:
1.0 Cathod Band
2.0 First Line: F - Fairchild Logo
3.0 Second Line: Device name - For 1Nxx series: 3
rd
to 5th characters of the device name.
For BZxx series: 4
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 Fourth Line: XY or XYL - Two Digit - Six Weeks Date Code
Where: X represents the last digit of the calendar year
Y represents the Six weeks numeric code
L represents the Large die identification
6.0 Devices shall be marked as required in the device specification (PID or FSC Test Spec).
7.0 Maximum no. of marking lines: 4
8.0 Maximum no. of digits per line: 3
9.0 FSC logo must be 20 % taller than the alphanumeric marking and should occupy the 2 characters of the specified line.
10.0 Marking Font: Arial (Except FSC Logo)
11.0 First character of each marking line must be aligned vertically
©2004 Fairchild Semiconductor Corporation
1N957B - 1N991B, Rev. E2
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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.
ACEx™
FACT Quiet Series™
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FASTr™
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CROSSVOLT™
FRFET™
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GlobalOptoisolator™
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E
2
CMOS™
HiSeC™
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I
2
C™
FACT™
i-Lo™
Across the board. Around the world.™
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As used herein:
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1. Life support devices or systems are devices or
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PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Advance Information
Product Status
Formative or
In Design
Definition
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
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This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
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The datasheet is printed for reference information only.
Rev. I10
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