1N957B-1N992B
500 mW SILICON ZENER DIODES
High-reliability discrete products
and engineering services since 1977
FEATURES
Available as “HR” (high reliability) screened per MIL-PRF-19500, JANTX level. Add “HR” suffix to base part number.
Available as non-RoHS (Sn/Pb plating), standard, and as RoHS by adding “-PBF” suffix.
MAXIMUM RATINGS
Rating
Value
Operating temperature
Storage temperature
-65°C to +175°C
-65°C to +175°C
250°C/W junction to lead at 3/8” lead length from body, or 310°C/W junction to ambient when mounted on
FR4 PC board(1)
Thermal resistance
Steady-state power
≤ 25°C when mounted on FR4 PC board(1)
0.5W at TL ≤ 50°C 3/8” from body or 0.48W at TA
@ 200 mA: 1.1 volts maximum (1N957B-1N985B)
@ 200mA: 1.3 volts maximum (1N985-1N992B)
260°C for 10 s maximum
Forward voltage
Solder temperature
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise specified)
Nominal
Maximum Maximum
Zener
zener
Maximum
temperature
coefficient
DC zener
surge
Maximum reverse
leakage current
test
Maximum zener impedance(3)
Part
voltage
(2)
current
(4)
current
(5)
current
number
(1)
VZ
Volts
6.8
7.5
8.2
9.1
10
IZT
mA
18.5
16.5
15.0
14.0
12.5
11.5
10.5
9.5
ZZT @ IZT
Ohms
4.5
5.5
6.5
7.5
8.5
9.5
11.5
13
ZZK
Ohms
700
@IZK
mA
IZM
mA
55
50
45
41
38
32
31
28
25
24
20
18
16
15
13
12
11
10
9.5
8.8
IZSM
mA
300
275
250
225
200
175
160
150
130
120
110
100
90
IR
µA
150
75
50
25
10
5
@VR
Volts
5.2
αvz
%/°C
0.05
1N957B
1N958B
1N959B
1N960B
1N961B
1N962B
1N963B
1N964B
1N965B
1N966B
1N967B
1N968B
1N969B
1N970B
1N971B
1N972B
1N973B
1N974B
1N975B
1N976B
1.0
700
0.5
5.7
0.058
0.065
0.068
0.075
0.076
0.077
0.079
0.082
0.083
0.085
0.086
0.087
0.088
0.090
0.091
0.092
0.093
0.094
0.095
700
0.5
6.2
700
0.5
6.9
700
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
7.6
11
700
8.4
12
700
5
9.1
13
700
5
9.9
15
8.5
16
700
5
11.4
12.2
13.7
15.2
16.7
18.2
20.6
22.8
25.1
27.4
29.7
32.7
16
7.8
17
700
5
18
7.0
21
750
5
20
6.2
25
750
5
22
5.6
29
750
5
24
5.2
33
750
80
5
27
4.6
41
750
70
5
30
4.2
49
1000
1000
1000
1000
1500
65
5
33
3.8
58
60
5
36
3.4
70
55
5
39
3.2
80
46
5
43
3.0
93
44
5
Rev. 20150825