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1N4728UR-1
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Product Detailed Parameters
- Description：DIODE ZENER 3.3V 1W DO213AB
- Series：-
- Mfr：Microsemi Corporation
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：3.3 V
- Tolerance：±10%
- Power - Max：1 W
- Impedance (Max) (Zzt)：10 Ohms
- Current - Reverse Leakage @ Vr：100 µA @ 1 V
- Operating Temperature：-65°C ~ 175°C
- Mounting Type：Surface Mount
- Package / Case：DO-213AB, MELF (Glass)
- Voltage - Forward (Vf) (Max) @ If：1.2 V @ 200 mA
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Overview
The Microsemi Corporation 1N4728UR-1 is a silicon unidirectional voltage regulator diode designed for high-reliability applications. It features a hermetically sealed glass MELF (DO-213AB) package with metallurgically bonded construction and double plug design. The device provides a nominal Zener voltage of 3.3V with a power dissipation rating of 1W. It is available in JAN, JANTX, and JANTXV screening levels per MIL-PRF-19500/116 standards.
Feature Summary
- Hermetically sealed glass MELF package ensures environmental stability
- Metallurgically bonded construction with double plug design for structural integrity
- Available in military screening levels including JAN, JANTX, and JANTXV
Applications
- High-reliability aerospace electronic circuits
- Military defense systems requiring strict environmental sealing
- Spacecraft voltage regulation modules
Procurement Notes
Verify the specific screening level required (JAN, JANTX, or JANTXV) as these denote different quality assurance standards under MIL-PRF-19500/116. Confirm that the DO-213AB MELF package matches the target PCB footprint. Ensure the supplier provides traceability documentation for the hermetic seal integrity and material composition.
Selection Notes
Select this component when a hermetically sealed surface-mount Zener diode is necessary for harsh environments. The 1N4728UR-1 serves as a direct replacement for standard plastic encapsulated 1N4728 types where moisture resistance and long-term reliability are critical. Consider the higher thermal resistance of glass packages compared to plastic alternatives during thermal management planning.
Part Context
This part belongs to the Microsemi 1N4728UR through 1N4764UR series of surface-mount 1.0 W glass Zener diodes. These devices are electrically similar to the JEDEC registered 1N4728A through 1N4764A series but offer superior hermetic sealing. The series covers Zener voltages from 3.3V to 100V, providing extensive selection for voltage regulation needs in ruggedized electronics.
Replacement Considerations
Direct equivalents include the MLL4728A series. For non-hermetic applications, the standard 1N4728A or 1N4728AP may be used if environmental sealing is not required.
