1N4494US

Single Zener Diodes Overview

The Microchip Technology 1N4494US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 160 V and a maximum power dissipation of 1.5 W at 25°C ambient temperature. It features a standard 5% tolerance, a test current (IZT) of 1.6 mA, and a maximum dynamic impedance (ZZT) of 1000 Ohms. The device operates within a junction and storage temperature range of -65°C to +175°C, includes a maximum reverse current of 0.25 µA at the specified voltage, and utilizes a hermetically sealed voidless glass D-5A MELF package.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass construction with internal metallurgical bonds for high reliability
• Qualified per MIL-PRF-19500/406 for JAN, JANTX, JANTXV, and JANS levels
• Inherently radiation hard and non-sensitive to ESD per MIL-STD-750 method 1020

Single Zener Diodes Applications

• High-reliability military and aerospace circuits where failure cannot be tolerated
• Voltage regulation over broad operating current and temperature ranges
• Radiation-hardened electronic systems

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required reliability level (JAN, JANTX, JANTXV, or JANS) and tolerance, as these define the qualification status. Confirm RoHS compliance requirements against the commercial grade availability if applicable. Ensure the procurement documentation references the correct datasheet revision T4-LDS-0183-1 for accurate electrical characteristics and mechanical dimensions.

Single Zener Diodes Selection Notes

Select this component when a 160 V Zener reference is needed in a surface mount form factor requiring military-grade hermetic sealing. The 1.5 W power rating supports moderate current regulation. Consider the high dynamic impedance of 1000 Ohms, which may limit suitability for low-noise applications compared to lower voltage variants. Verify thermal management capabilities given the 20°C/W junction-to-end cap thermal resistance.

Single Zener Diodes Part Context

This part belongs to the 1N4460US through 1N4496US series of industry-recognized 1.5 Watt glass Zener diodes. These devices serve as surface mount equivalents to popular JEDEC registered axial-lead series, offering a compact alternative while maintaining robust construction and triple-layer passivation for demanding environments.

Single Zener Diodes Replacement Considerations

Direct replacements include other manufacturers' 1N4494 equivalent parts in D-5A MELF packages. For military specifications, verify compatibility with JAN1N4494US or JANTX1N4494US variants from qualified sources.