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  Microsemi Electronic Components Datasheet  

1N749A-1 Datasheet

Silicon 500 mW Zener Diodes

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1N749A-1 pdf
1N746A-1 – 1N759A-1,
1N4370A-1 – 1N4372A-1
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.
Qualified Levels:
JAN, JANTX, and
JANTXV
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).
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.
DO-35 (DO-204AH)
Package
Also available in:
DO-213AA package
(MELF surface mount)
1N746AUR-1 –
1N759AUR-1 and
1N4370AUR-1 –
1N4372AUR-1
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
mounted on PCB (1)
Average Rated Power Dissipation
@ TL = +50°C .375 inch (9.53 mm) from body (2)
@ TA = 55°C mounted on PCB
Forward Voltage @ IF = 200 mA
Solder Temperature @ 10 s
Symbol
TJ and TSTG
R ӨJL
Value
-65 to +175
250
Unit
ºC
ºC/W
R ӨJA
300 ºC/W
P M(AV)
VF
T SP
0.5 W
0.4
1.1 V
260 oC
NOTES:
1. See Figures 1 and 2 for derating curves. TA = +75 °C on an FR4 PC board with 1 oz copper
metalization.
2. The 0.5 W linearly derates starting at TL = 50 °C and goes to zero at 175 °C. For ambient TA
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).
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
T4-LDS-0288, Rev. 1 (5/23/13)
©2013 Microsemi Corporation
Page 1 of 6


  Microsemi Electronic Components Datasheet  

1N749A-1 Datasheet

Silicon 500 mW Zener Diodes

No Preview Available !

1N749A-1 pdf
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.
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%
PART NOMENCLATURE
JAN 1N746 A -1 (e3)
RoHS Compliance
e3 = RoHS compliant (available
on commercial grade only)
Blank = non-RoHS compliant
Metallurgically Bonded
Symbol
IR
IZ, IZT, IZK
I ZM
I ZSM
VF
VR
VZ
ZZT or ZZK
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 (IZ), at a specified test point (IZT), near breakdown knee (IZK).
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 (IZ) 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 IZT or IZK) and superimposed on IZT or IZK respectively.
T4-LDS-0288, Rev. 1 (5/23/13)
©2013 Microsemi Corporation
Page 2 of 6


Part Number 1N749A-1
Description Silicon 500 mW Zener Diodes
Maker Microsemi
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