1N957BUR-1 – 1N992BUR-1
Qualified Levels*:
JAN, JANTX, and
JANTXV
Available on
commercial
versions
Silicon MELF 500 mW Zener Diodes
Qualified per MIL-PRF-19500/117
DESCRIPTION
The popular 1N957BUR-1 through 1N992BUR-1 series of 0.5 watt Zener voltage regulators
provides a selection from 6.8 to 200 volts in a standard 5%, 2% and 1% tolerance versions.
These glass MELF DO-213AA Zeners feature an internal metallurgical bond and are available
in military qualified and commercial RoHS compliant versions. Military qualified versions are
available on the 1N962BUR-1 through 1N992BUR-1 range of part numbers.
Important:
For the latest information, visit our website
http://www.microsemi.com.
FEATURES
•
•
•
•
•
JEDEC registered 1N957B to 1N992B number series.
Internal metallurgical bond.
*JAN, JANTX, and JANTXV qualifications are available per MIL-PRF-19500/117 for part numbers
1N962BUR-1 through 1N992BUR-1.
Upscreening is available in reference to MIL-PRF-19500 for the range of 1N957BUR-1 through
1N961BUR-1. (See
part nomenclature
for all available options.)
RoHS compliant versions available (commercial grade only).
DO-213AA MELF
Package
Also available in:
DO-35 (DO-204AH)
package
(axial-leaded)
1N957B-1 –
1N992B-1
APPLICATIONS / BENEFITS
•
•
•
•
•
•
•
Regulates voltage over a broad operating current and temperature range.
Extensive selection from 6.8 to 200 V.
Standard voltage tolerance is ± 5% with optional tighter tolerances of ± 2% or 1%.
Small size for high density mounting using the surface mount method (see package illustration).
Non-sensitive to ESD per MIL-STD-750 method 1020.
Minimal capacitance.
Inherently radiation hard as described in Microsemi
MicroNote 050.
MAXIMUM RATINGS
Parameters/Test Conditions
Operating and Storage Temperature
Thermal Resistance Junction-to-End Cap
Thermal Resistance Junction-to-Ambient when
(1)
mounted on PCB
Steady-State Power Dissipation
(2)
@ T
EC
= +125°C
@ T
A
= 55°C mounted on PCB
Forward Voltage @ I
F
= 200 mA
1N957UR – 1N985UR
1N986UR – 1N992UR
Solder Temperature @ 10 s
NOTES:
Symbol
T
J
and T
STG
R
ӨJEC
R
ӨJA
P
D
Value
-65 to +175
100
300
0.5
0.4
1.1
1.3
260
Unit
ºC
ºC/W
ºC/W
W
MSC – Lawrence
6 Lake Street,
Lawrence, MA 01841
Tel: 1-800-446-1158 or
(978) 620-2600
Fax: (978) 689-0803
MSC – Ireland
Gort Road Business Park,
Ennis, Co. Clare, Ireland
Tel: +353 (0) 65 6840044
Fax: +353 (0) 65 6822298
Website:
www.microsemi.com
V
F
T
SP
V
o
C
1. See
figure 1
for derating curves. T
A
= +75°C on an FR4 PC board with 1 oz copper metalization.
2. Derate to 0 at +175°C.
T4-LDS-0287-1, Rev. 1 (121795)
©2012 Microsemi Corporation
Page 1 of 6
1N957BUR-1 – 1N992BUR-1
MECHANICAL and PACKAGING
•
•
•
•
•
•
•
•
CASE: Hermetically sealed glass case package.
TERMINALS: Tin/lead plated or RoHS compliant matte-tin (on commercial grade only) over copper clad steel. Solderable per
MIL-STD-750, method 2026.
POLARITY: Cathode end is banded.
MOUNTING: The axial coefficient of expansion (COE) of this device is approximately +6PPM/°C. The COE of the mounting
surface system should be selected to provide a suitable match with this device.
MARKING: Part number.
TAPE & REEL option: Standard per EIA-296. Consult factory for quantities.
WEIGHT: 0.04 grams.
See
Package Dimensions
on last page.
PART NOMENCLATURE
1N957BUR-1 – 1N961BUR-1 only:
1N957
JEDEC type number
(see
Electrical Characteristics
table)
Zener Voltage Tolerance
B = 5%
C = 2%
D = 1%
B
UR
-1
(e3)
RoHS Compliance
e3 = RoHS compliant
Blank = non-RoHS compliant
Metallurgically Bonded
Surface Mount Package type
1N962BUR-1 – 1N992BUR-1 only:
JAN
Reliability Level
JAN = JAN level
JANTX = JANTX level
JANTXV = JANTXV level
Blank = Commercial
JEDEC type number
(see
Electrical Characteristics
table)
Zener Voltage Tolerance
B = 5%
C = 2%
D = 1%
1N962
B
UR
-1 (e3)
RoHS Compliance
e3 = RoHS compliant (available
on commercial grade only)
Blank = non-RoHS compliant
Metallurgically Bonded
Surface Mount Package type
T4-LDS-0287-1, Rev. 1 (121795)
©2012 Microsemi Corporation
Page 2 of 6
1N957BUR-1 – 1N992BUR-1
SYMBOLS & DEFINITIONS
Definition
Reverse Current: The maximum reverse (leakage) current that will flow at the specified voltage and temperature.
Regulator Current: The dc regulator current (I
Z
), at a specified test point (I
ZT
), near breakdown knee (I
ZK
).
Maximum Regulator (Zener) Current: The maximum rated dc current for the specified power rating.
Maximum Zener Surge Current: The non-repetitive peak value of Zener surge current at a specified wave form.
Maximum Forward Voltage: The maximum forward voltage the device will exhibit at a specified current.
Reverse Voltage: The reverse voltage dc value, no alternating component.
Zener Voltage: The Zener voltage the device will exhibit at a specified current (I
Z
) in its breakdown region.
Dynamic Impedance: The small signal impedance of the diode when biased to operate in its breakdown region at a
specified rms current modulation (typically 10% of I
ZT
or I
ZK
) and superimposed on I
ZT
or I
ZK
respectively.
Symbol
I
R
I
Z
, I
ZT
, I
ZK
I
ZM
I
ZSM
V
F
V
R
V
Z
Z
ZT
or Z
ZK
T4-LDS-0287-1, Rev. 1 (121795)
©2012 Microsemi Corporation
Page 3 of 6
1N957BUR-1 – 1N992BUR-1
ELECTRICAL CHARACTERISTICS
NOMINAL
ZENER
VOLTAGE
(NOTE 2)
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
47
51
56
62
68
75
82
91
100
110
120
130
150
160
180
200
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
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
Z
Z
Ohms
4.5
5.5
6.5
7.5
8.5
9.5
11.5
13.0
16
17
21
25
29
33
41
49
58
70
80
93
105
125
150
185
230
270
330
400
500
750
900
1100
1500
1700
2200
2500
Z
ZK
@ I
ZK
Ohms
µA
700
250
700
250
700
250
700
250
700
250
700
250
700
250
700
250
700
250
700
250
750
250
750
250
750
250
750
250
750
250
1000
250
1000
250
1000
250
1000
250
1000
250
1500
250
1500
250
2000
250
2000
250
2000
250
2000
250
3000
250
3000
250
3000
250
4000
250
4500
250
5000
250
6000
250
6500
250
7100
250
8000
250
MAXIMUM DC
ZENER
CURRENT
(NOTE 4)
I
ZM
mA
55
50
45
41
38
35
32
30
26
25
21
19
17
16
14
13
12
11
9.1
8.8
7.9
7.4
6.9
6.0
5.5
5.1
4.6
4.2
3.7
3.3
3.1
2.7
2.4
2.2
2.0
1.8
MAXIMUM
SURGE
CURRENT
(NOTE 5)
I
ZSM
mA
300
275
250
225
200
590
540
500
433
406
361
325
295
271
240
216
197
180
166
151
138
127
116
105
95
86
79
71
65
59
54
50
43
40
36
32
MAXIMUM
REVERSE
LEAKAGE
CURRENT
I
R
@ V
R
µA
Volts
150
5.2
75
5.7
50
6.2
25
6.9
10
7.6
1.0
8.4
1.0
9.1
0.5
9.9
0.5
11
0.5
12
0.5
14
0.5
15
0.5
17
0.5
18
0.5
21
0.5
23
0.5
25
0.5
27
0.5
30
0.5
33
0.5
36
0.5
39
0.5
43
0.5
47
0.5
52
0.5
56
0.5
62
0.5
69
0.5
76
0.5
84
0.5
91
0.5
99
0.5
114
0.5
122
0.5
137
0.5
152
MAXIMUM
TEMPERATURE
COEFFICIENT
α
VZ
%/°C
+0.050
+0.058
+0.065
+0.068
+0.075
+0.073
+0.076
+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
+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
JEDEC TYPE
NUMBER
(NOTE 1)
1N957BUR-1
1N958BUR-1
1N959BUR-1
1N960BUR-1
1N961BUR-1
1N962BUR-1
1N963BUR-1
1N964BUR-1
1N965BUR-1
1N966BUR-1
1N967BUR-1
1N968BUR-1
1N969BUR-1
1N970BUR-1
1N971BUR-1
1N972BUR-1
1N973BUR-1
1N974BUR-1
1N975BUR-1
1N976BUR-1
1N977BUR-1
1N978BUR-1
1N979BUR-1
1N980BUR-1
1N981BUR-1
1N982BUR-1
1N983BUR-1
1N984BUR-1
1N985BUR-1
1N986BUR-1
1N987BUR-1
1N988BUR-1
1N989BUR-1
1N990BUR-1
1N991BUR-1
1N992BUR-1
NOTES:
1
The JEDEC type numbers shown (B suffix) have a ± 5% tolerance on nominal Zener voltage. The suffix C will have ± 2% tolerance; and suffix
D will have ± 1% tolerance.
2
3
Zener voltage (V
Z
) is measured after the test current has been applied for 20 ± 5 seconds. Mounting clips shall be maintained at temperature
of 25 ± 8/ - 2 °C.
The Zener impedance is derived when a 60 cycle ac current having an rms value equal to 10% of the dc Zener current (I
ZT
or I
ZK
) is
superimposed on I
ZT
or I
ZK
. Zener impedance is measured at 2 points to ensure a sharp knee on the breakdown curve and to eliminate
unstable units. See
MicroNote 202
for variation in dynamic impedance with different Zener currents.
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 400 mW. In the case of
individual diodes I
ZM
is that value of current which results in a dissipation of 400 mW at 75°C lead temperature at 3/8” from body.
The surge for I
ZSM
is a square wave or equivalent half-sine wave pulse of 1/120 sec. duration.
4
5
T4-LDS-0287-1, Rev. 1 (121795)
©2012 Microsemi Corporation
Page 4 of 6
1N957BUR-1 – 1N992BUR-1
GRAPHS
DC Operations Maximum Rating (mW)
T
EC
(ºC) (End Cap)
FIGURE 1
Temperature-Power Derating Curve
Theta (C/W)
Time (s)
FIGURE 2
Thermal Impedance
T4-LDS-0287-1, Rev. 1 (121795)
©2012 Microsemi Corporation
Page 5 of 6
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