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
Operating temperature
Storage temperature
Thermal resistance
Steady-state power
Forward voltage
Solder temperature
Value
-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)
0.5W at T
L
≤ 50°C 3/8” from body or 0.48W at T
A
≤ 25°C when mounted on FR4 PC board
(1)
@ 200 mA: 1.1 volts maximum (1N957B-1N985B)
@ 200mA: 1.3 volts maximum (1N985-1N992B)
260°C for 10 s maximum
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise specified)
Part
number
(1)
Nominal
zener
voltage
(2)
Zener
test
current
I
ZT
mA
18.5
16.5
15.0
14.0
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
Maximum zener impedance
(3)
Z
ZT
@ I
ZT
Ohms
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
Z
ZK
Ohms
700
700
700
700
700
700
700
700
700
700
750
750
750
750
750
1000
1000
1000
1000
1500
@I
ZK
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
Maximum
DC zener
current
(4)
Maximum
surge
current
(5)
Maximum reverse
leakage current
I
R
µA
150
75
50
25
10
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
@V
R
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
Maximum
temperature
coefficient
α
vz
%/°C
0.05
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
V
Z
Volts
6.8
7.5
8.2
9.1
10
11
12
13
15
16
18
20
22
24
27
30
33
36
39
43
I
ZM
mA
55
50
45
41
38
32
31
28
25
24
20
18
16
15
13
12
11
10
9.5
8.8
I
ZSM
mA
300
275
250
225
200
175
160
150
130
120
110
100
90
80
70
65
60
55
46
44
1N957B
1N958B
1N959B
1N960B
1N961B
1N962B
1N963B
1N964B
1N965B
1N966B
1N967B
1N968B
1N969B
1N970B
1N971B
1N972B
1N973B
1N974B
1N975B
1N976B
Rev. 20150825
High-reliability discrete products
and engineering services since 1977
1N957B-1N992B
500 mW SILICON ZENER DIODES
Maximum
DC zener
current
(4)
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise specified)
Part
number
(1)
Nominal
zener
voltage
(2)
Zener
test
current
I
ZT
mA
2.7
2.5
2.2
2.0
1.8
1.7
1.5
1.4
1.3
1.1
1.0
0.95
0.85
0.80
0.68
0.65
Maximum zener impedance
Z
ZT
@ I
ZT
Ohms
105
125
150
185
230
270
330
400
500
750
900
1100
1500
1700
2200
2500
Z
ZK
Ohms
1500
1500
2000
2000
2000
2000
3000
3000
3000
4000
4500
5000
6000
6500
7100
8000
(3)
Maximum
surge
current
(5)
Maximum reverse
leakage current
I
R
µA
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
@V
R
Volts
35.8
38.8
42.6
47.1
51.7
56.0
62.2
69.2
76.0
83.6
91.2
98.8
114.0
121.6
136.8
152.0
Maximum
temperature
coefficient
α
vz
%/°C
0.095
0.096
0.096
0.097
0.097
0.098
0.098
0.099
0.110
0.110
0.110
0.110
0.110
0.110
0.110
0.110
V
Z
Volts
47
51
56
62
68
75
82
91
100
110
120
130
150
160
180
200
@I
ZK
mA
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
I
ZM
mA
7.9
7.4
6.8
6.0
5.5
5.0
4.6
4.1
3.7
3.3
3.1
2.7
2.4
2.2
2.0
1.8
I
ZSM
mA
40
37
35
30
28
26
23
21
18
16
15
13
12
11
10
9
1N977B
1N978B
1N979B
1N980B
1N981B
1N982B
1N983B
1N984B
1N985B
1N986B
1N987B
1N988B
1N989B
1N990B
1N991B
1N992B
NOTE 1. Zener voltage tolerance on ‘’B’’ suffix is + 5%. Suffix letter A denotes +10%. No suffix denotes +20% tolerance. ‘’C’’ suffix denotes + 2% and ‘’D’’ suffix denotes + 1%.
NOTE 2. Zener voltage is measured with the device junction in thermal equilibrium at an ambient temperature of 25°C + 3°C.
NOTE 3. Zener impedance is derived by superimposing on I
ZTA
60HZ rms a.c. current equal to 10% of I
ZT
.
NOTE 4: The values of I
ZM
are calculated for a ±5% tolerance on nominal zener voltage. Allowance has been made for the rise in zener voltage above V
ZT
which results from zener impedance
and the increase in junction temperature as power dissipation approaches 400mW. In the case of individual diodes I
ZM
is that value of current which results in a dissipation of 400mW at 75°C
lead temperature at 3/8” from body.
NOTE 5: The surge for I
ZM
is a square wave or equivalent half-sine wave pulse of 1/120 second duration.
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