1N4963US

Overview

The Microchip Technology 1N4963US is a surface-mount Zener voltage regulator with a nominal breakdown voltage of 16 V and a maximum power dissipation of 5 W. It operates within a junction temperature range of -65°C to +175°C. The device features a standard voltage tolerance of ±5%, a test current (IZT) of 75 mA, and a maximum reverse leakage current of 5 µA at 12.2 V. Dynamic impedance (ZZT) is specified at 3.5 Ohms, while the forward voltage (VF) is 1.50 V at 1.0 A. The package utilizes a D-5B-2 form factor.

Feature Summary

• Hermetically sealed voidless-glass construction using internal metallurgical bonds for high reliability
• Military qualification compliant with MIL-PRF-19500/356 standards
• Triple-layer passivation providing robustness against electrostatic discharge
• Inherently radiation hard design suitable for demanding environments

Applications

• High-reliability aerospace systems
• Defense electronics requiring failure-intolerant components
• Radiation-hardened circuit protection
• Precision voltage regulation in extreme temperature conditions

Procurement Notes

Verify that the component matches the specific military qualification requirements of MIL-PRF-19500/356. Confirm the package type corresponds to the surface-mount D-5B-2 configuration rather than the axial-leaded variant. Ensure the ordering suffix aligns with the required voltage tolerance and testing category. Validate manufacturer documentation for authenticity and traceability prior to integration.

Selection Notes

Select this component when a hermetically sealed surface-mount Zener diode is required for critical applications. The 1N4963US provides a 16 V reference point with a 5 W power rating. Consider the specific thermal resistance characteristics and operating temperature limits during circuit design. Verify compatibility with existing board layouts due to the unique D-5B-2 footprint dimensions.

Part Context

This part belongs to the 1N4954US through 1N4996US series of 5 Watt glass Zener regulators manufactured by Microsemi Scottsdale Division. These devices are designed for industries where component failure is unacceptable. The series offers extensive voltage selections ranging from 3.3 V to 390 V in a standardized surface-mount package format.

Replacement Considerations

Axial-leaded equivalents such as the 1N4963 are available by removing the US suffix. Other parts within the 1N4954US through 1N4996US series share identical packaging but differ in voltage ratings.