1N4495US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4495US/TR is a surface mount Zener voltage regulator qualified to MIL-PRF-19500/406. It features a hermetically sealed void-less glass package with an internal metallurgical bond. The nominal Zener voltage is 180 V at a test current of 1.4 mA. Maximum dynamic impedance is 7000 Ohms, and maximum reverse current is 25 µA. Steady-state power dissipation is 1.5 W at 25°C ambient temperature. Operating junction and storage temperatures range from -65°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed void-less glass construction with tungsten slugs for high reliability.
• Internal Category 1 metallurgical bonds ensuring robust mechanical integrity.
• Triple-layer passivation providing protection against environmental stress.
• Inherently radiation hard and non-sensitive to electrostatic discharge.

Single Zener Diodes Applications

• High-reliability military applications where failure cannot be tolerated.
• Voltage regulation over broad operating current and temperature ranges.
• Circuit protection in harsh environments requiring radiation hardness.

Single Zener Diodes Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for the application, as the base part number covers multiple qualification levels. Confirm RoHS compliance status if applicable, noting that compliant versions are typically commercial grade only. Ensure the tape and reel packaging meets EIA-481-B standards for automated assembly processes.

Single Zener Diodes Selection Notes

Select this component for designs requiring a 1.5 W surface mount Zener diode with strict hermetic sealing requirements. The 180 V rating suits high-voltage regulation tasks. Consider the thermal resistance of 20°C/W and the wide operating temperature range when designing heat dissipation strategies for dense circuit layouts.

Single Zener Diodes Part Context

This device belongs to the 1N4460US through 1N4496US series of industry-recognized Zener voltage regulators. These components serve as surface mount equivalents to popular JEDEC registered axial-lead series, offering similar electrical characteristics in a compact MELF (D-5A) package suitable for modern PCB mounting techniques.

Single Zener Diodes Replacement Considerations

Direct replacements include other parts within the 1N4460US–1N4496US series from Microsemi/Microchip. Verify that substitute components match the specific MIL-PRF-19500/406 qualification level and package dimensions to ensure compatibility with existing footprints and reliability standards.

Single Zener Diodes FAQ

What type of metallurgical bond does the 1N4495US use?

The 1N4495US utilizes an internal Category 1 metallurgical bond, which contributes to its robust construction and suitability for high-reliability applications.

Is the 1N4495US resistant to electrostatic discharge?

Yes, the device is non-sensitive to electrostatic discharge per MIL-STD-750 method 1020.