1N746A-1 – 1N759A-1,
1N4370A-1 – 1N4372A-1
Qualified Levels:
JAN, JANTX, and
JANTXV
Available on
commercial
versions
Silicon 500 mW Zener Diodes
Qualified per MIL-PRF-19500/127
DESCRIPTION
This popular series of 500 mW Zener voltage regulators provides a selection from 2.4 to 12
volts in a standard 5% tolerance as well as available tighter 2% and 1% tolerances. These
axial-leaded, glass DO-35 Zeners feature an internal metallurgical bond and are military
qualified to the JAN, JANTX, and JANTXV level. A RoHS compliant commercial grade only
version is also available.
Important:
For the latest information, visit our website
http://www.microsemi.com.
FEATURES
•
•
•
•
•
JEDEC registered 1N746 through 1N759A and 1N4370 through 1N4372A series.
Standard voltage tolerance is ± 5% with optional tighter tolerances of ± 2% or 1%.
Internal metallurgical bond.
JAN, JANTX, and JANTXV qualifications are available per MIL-PRF-19500/127.
(See
part nomenclature
for all available options.)
RoHS compliant versions available (commercial grade only).
DO-35
(DO-204AH)
Package
Also available in:
DO-213AA package
(MELF surface mount)
1N746AUR-1 –
1N759AUR-1 and
1N4370AUR-1 –
1N4372AUR-1
APPLICATIONS / BENEFITS
•
•
•
•
•
•
Regulates voltage over a broad range of temperature and current.
Regulated voltage range from 2.4 to 12 V.
Flexible axial-lead mounting terminals.
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-Lead
@ .375 inch (9.53 mm) lead length from body
Thermal Resistance Junction-to-Ambient when
(1)
mounted on PCB
Average Rated Power Dissipation
(2)
@ T
L
= +50°C .375 inch (9.53 mm) from body
@ T
A
= 55°C mounted on PCB
Forward Voltage @ I
F
= 200 mA
Solder Temperature @ 10 s
NOTES:
Symbol
T
J
and T
STG
R
ӨJL
R
ӨJA
Value
-65 to +175
250
300
Unit
ºC
ºC/W
ºC/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
P
M(AV)
V
F
T
SP
0.5
0.4
1.1
260
W
V
C
o
1. See
Figures 1 and 2
for derating curves. T
A
= +75 °C on an FR4 PC board with 1 oz copper
metalization.
2. The 0.5 W linearly derates starting at T
L
= 50 °C and goes to zero at 175 °C. For ambient T
A
condition on a typical PC board, it linearly derates from 400 mW starting at 55 °C and goes to zero at
175 °C (see
Figure 2).
T4-LDS-0288, Rev. 1 (5/23/13)
©2013 Microsemi Corporation
Page 1 of 6
1N746A-1 – 1N759A-1,
1N4370A-1 – 1N4372A-1
MECHANICAL and PACKAGING
•
•
•
•
•
•
•
CASE: Hermetically sealed axial-lead glass DO-35 (DO-204 AH) package.
TERMINALS: Tin-lead or RoHS compliant annealed matte-tin plating (on commercial grade only). Solderable per MIL-STD-750,
method 2026.
MARKING: Part number.
POLARITY: Cathode indicated by band. Diode to be operated with the banded end positive with respect to the opposite end for
Zener regulation.
TAPE & REEL option: Standard per EIA-296 (add “TR” suffix to part number).
WEIGHT: Approximately 0.2 grams
See
Package Dimensions
on last page.
PART NOMENCLATURE
JAN
Reliability Level
JAN = JAN level
JANTX = JANTX level
JANTXV = JANTXV level
Blank = Commercial
JEDEC type number
(see
Electrical Characteristics
table)
Zener Voltage Tolerance
A = 5%
C = 2%
D = 1%
1N746
A
-1
(e3)
RoHS Compliance
e3 = RoHS compliant (available
on commercial grade only)
Blank = non-RoHS compliant
Metallurgically Bonded
Symbol
I
R
I
Z
, I
ZT
, I
ZK
I
ZM
I
ZSM
V
F
V
R
V
Z
Z
ZT
or Z
ZK
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.
T4-LDS-0288, Rev. 1 (5/23/13)
©2013 Microsemi Corporation
Page 2 of 6
1N746A-1 – 1N759A-1,
1N4370A-1 – 1N4372A-1
ELECTRICAL CHARACTERISTICS
@ 25 ºC
NOMINAL
ZENER
VOLTAGE
V
Z
@ I
ZT
(NOTE 2)
Volts
2.4
2.7
3.0
3.3
3.6
3.9
4.3
4.7
5.1
5.6
6.2
6.8
7.5
8.2
9.1
10.0
12.0
MAXIMUM
ZENER
IMPEDANCE
Z
ZT
@ I
ZT
(NOTE 3)
Ohms
30
30
29
24
22
20
18
15
14
8
3
3
4
5
6
7
10
MAXIMUM
REVERSE
VOLTAGE
V
R
Volts
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.5
2.0
2.5
3.5
4.0
5.0
6.0
7.0
8.0
9.0
MAXIMUM REVERSE
CURRENT
I
R
@ V
R
@ 25 °C
µA
100
60
30
5
3
2
2
5
5
5
5
2
2
1
1
1
1
@ +150 °C
µA
200
150
100
30
30
30
50
50
50
50
50
50
50
50
50
50
50
MAXIMUM
ZENER
CURRENT
I
ZM
(NOTE 4)
mA
155
140
125
120
110
100
90
85
75
70
65
60
55
50
45
40
35
TEMPERATURE
COEFFICIENT
OF ZENER
VOLTAGE
α
VZ
% / °C
-0.085
-0.080
-0.075
-0.070
-0.065
-0.060
-0.055 / +.020
-0.043 / +.025
-0.030 / +.030
-0.028 / +.036
+0.045
+0.050
+0.058
+0.062
+0.068
+0.076
+0.080
JEDEC
TYPE NO.
(NOTE 1)
1N4370A-1
1N4371A-1
1N4372A-1
1N746A-1
1N747A-1
1N748A-1
1N749A-1
1N750A-1
1N751A-1
1N752A-1
1N753A-1
1N754A-1
1N755A-1
1N756A-1
1N757A-1
1N758A-1
1N759A-1
NOTES:
1
The JEDEC type numbers shown (A suffix) have a ± 5% tolerance on nominal Zener voltage.
2.
3.
Voltage measurements to be performed 20 seconds after application of dc test current.
Zener impedance derived by superimposing on I
ZT
, a 60 cps, rms current equal to 10% I
ZT
(20 mA). See
MicroNote 202
for typical Zener
Impedance variation with different operating currents.
Allowance has been made for the increase in V
Z
due to Z
Z
and for the increase in junction temperature as the unit approaches thermal
equilibrium at the power dissipation of 400 mW.
4.
T4-LDS-0288, Rev. 1 (5/23/13)
©2013 Microsemi Corporation
Page 3 of 6
1N746A-1 – 1N759A-1,
1N4370A-1 – 1N4372A-1
GRAPHS
DC Operations Maximum Rating (mW)
T
L
(ºC) (Leads .375”)
FIGURE 1
Temperature-Power Derating Curve
DC Operations Maximum Rating (mW)
T
(PCB)
(ºC) (PCB)
FIGURE 2
Temperature-Power Derating Curve
T4-LDS-0288, Rev. 1 (5/23/13)
©2013 Microsemi Corporation
Page 4 of 6
1N746A-1 – 1N759A-1,
1N4370A-1 – 1N4372A-1
GRAPHS
(continued)
Theta (°C/W)
Time (s)
FIGURE 3
Thermal Impedance PCB mount
Theta (°C/W)
Time (s)
FIGURE 4
Thermal Impedance
(T
L
= 25 ºC at 0.375 inch (9.53 mm) from body.)
T4-LDS-0288, Rev. 1 (5/23/13)
©2013 Microsemi Corporation
Page 5 of 6
