1N4495

Single Zener Diodes Overview

The Microchip Technology 1N4495 is a military-qualified Zener voltage regulator diode designed for high-reliability applications. It features a hermetically sealed void-less glass package with an internal metallurgical bond, ensuring robust construction. The device operates within a junction and storage temperature range of -65°C to +175°C. Key electrical parameters include a nominal Zener voltage of 180V, a test current (IZT) of 1.4 mA, and a maximum dynamic impedance (ZZT) of 1300 Ohms at the test current. The maximum reverse leakage current is specified as 7.9 µA at a reverse voltage of 144V. The steady-state power dissipation is rated at 1.5 W when the lead temperature is maintained at +112°C.

Single Zener Diodes Feature Summary

• Hermetically sealed void-less glass construction with tungsten slugs for extreme durability.
• Qualified per MIL-PRF-19500/406 for JAN, JANTX, JANTXV, and JANS reliability levels.
• Inherently radiation hard and non-sensitive to electrostatic discharge.
• Triple-layer passivation provides enhanced protection against environmental factors.

Single Zener Diodes Applications

• High-reliability aerospace systems where failure is not tolerated.
• Military-grade electronic circuits requiring strict voltage regulation.
• Harsh environment instrumentation utilizing wide operating temperature ranges.

Single Zener Diodes Procurement Notes

Verify the specific qualification level required for your application, such as JAN, JANTX, JANTXV, or JANS, as these designations denote different reliability standards under MIL-PRF-19500/406. Confirm whether RoHS compliance is necessary, noting that compliant versions are available only in commercial grades. Ensure the ordering suffix correctly reflects the desired tolerance percentage and packaging configuration before finalizing procurement.

Single Zener Diodes Selection Notes

Select the 1N4495 when a precise 180V reference is needed in a ruggedized axial-lead package. Consider the high dynamic impedance of 1300 Ohms, which may limit suitability for low-noise precision applications compared to lower-voltage variants. Evaluate the thermal resistance of 42°C/W and the 1.5W power rating to ensure adequate heat dissipation strategies are implemented within the host system design constraints.

Single Zener Diodes Part Context

This component belongs to the 1N4460–1N4496 series of industry-recognized Zener voltage regulators. The series offers a broad selection of voltages ranging from 3.3V to 200V. While the standard 1N4495 designation implies a commercial grade, the datasheet confirms availability in various military qualification levels. These devices share common mechanical attributes, including the DO-41 package style and void-less glass encapsulation technology.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 180V Zener voltage and 1.5W power dissipation rating. Verify that substitute components meet the same MIL-PRF-19500/406 qualification requirements if military reliability is mandated. Check for equivalent package dimensions and terminal configurations to ensure physical compatibility during installation.