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1N4956US
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Product Detailed Parameters
- Description：DIODE ZENER 8.2V 5W D5B
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：8.2 V
- Tolerance：±5%
- Power - Max：5 W
- Impedance (Max) (Zzt)：1.5 Ohms
- Current - Reverse Leakage @ Vr：50 µA @ 6.2 V
- Operating Temperature：-65°C ~ 175°C
- Mounting Type：Surface Mount
- Package / Case：SQ-MELF, E
- Voltage - Forward (Vf) (Max) @ If：1.5 V @ 1 A
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Overview
The Microchip Technology 1N4956US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 8.2 V at a test current of 150 mA. It features a maximum dynamic impedance of 1.5 ohms and a maximum reverse leakage current of 50 µA at 6.2 V. The device dissipates 5 Watts at an ambient temperature of 140°C, operating within a junction temperature range of -65°C to +175°C. It utilizes a D-5B (E) package with copper end caps.
Feature Summary
- Hermetically sealed voidless glass construction with internal metallurgical bonds
- Military qualification per MIL-PRF-19500/356 for high-reliability applications
- Triple-layer passivation and inherent radiation hardness
Applications
- High-reliability military systems
- Spacecraft power regulation
- Avionics voltage control
Procurement Notes
Verify the specific revision level against the latest Microsemi datasheet SD44A. Confirm that the ordering suffix matches the required tolerance and packaging format. Ensure compliance with MIL-PRF-19500/356 standards if military qualification is mandatory for the intended deployment environment.
Selection Notes
Select this component when a robust surface mount solution is required for critical voltage regulation. The D-5B package facilitates automated assembly while maintaining thermal performance up to 5 Watts. Consider the tight voltage tolerance and low leakage characteristics suitable for precision analog circuits in harsh environments.
Part Context
This part belongs to the 1N4954US through 1N4996US series of 5-watt glass Zener diodes. These devices are designed for extreme durability and are widely recognized in aerospace and defense sectors. The series offers a broad selection of voltages from 3.3V to 390V in a standardized surface mount footprint.
Replacement Considerations
JAN1N4956CUS
FAQ
What is the maximum continuous current rating?
The maximum continuous regulator current (IZM) is 580 mA.
How is polarity indicated on the package?
Polarity is identified by a band marking the cathode end of the device.
