1N4958US

Overview

The Microchip Technology 1N4958US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 10.0 V at a test current of 125 mA. It features a maximum dynamic impedance of 2.0 ohms and a maximum reverse leakage current of 25 µA at 7.6 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 and Tin/Lead finish.

Feature Summary

• Hermetically sealed voidless glass construction with internal metallurgical bonds for high reliability
• Triple-layer passivation providing robustness against electrostatic discharge
• Inherently radiation hard design suitable for demanding environments

Applications

• High-reliability military circuits requiring MIL-PRF-19500/356 qualification
• Voltage regulation in aerospace systems where failure is not tolerated
• Power supply reference stages in harsh industrial environments

Procurement Notes

Verify the specific revision level and manufacturing origin when sourcing this component. Confirm that the supplier provides traceability documentation consistent with military specifications. Ensure the ordering suffix matches the required tolerance or package variant. Request material certification to validate compliance with RoHS exemptions if applicable. Validate packaging integrity upon receipt to maintain hermetic seal performance.

Selection Notes

Select this component for applications requiring a 5 Watt power rating in a compact surface mount footprint. Consider the thermal resistance characteristics when designing heat dissipation paths. Evaluate the forward voltage drop during reverse bias protection scenarios. Compare leakage current limits against sensitive input requirements. Assess the operating temperature range against environmental constraints.

Part Context

This part belongs to the 1N4954US through 1N4996US series of surface mount Zener diodes manufactured by Microsemi Scottsdale Division. These devices are industry-recognized regulators available in standard 5% tolerances. They serve as the surface mount equivalent to axial-leaded versions found in separate datasheets.

Replacement Considerations

Axial-leaded equivalents such as the 1N4958 are available by removing the US suffix. Other parts in the series like the 1N4957US or 1N4959US offer different voltage ratings.