1N4461

Single Zener Diodes Overview

The Microchip Technology 1N4461 is a military-qualified, void-less hermetically sealed glass Zener diode with a nominal voltage of 6.8 V and a test current of 37 mA. It operates within a junction temperature range of -65 °C to +175 °C and dissipates up to 1.5 W at a lead temperature of +112 °C. The device features a maximum dynamic impedance of 2.5 Ohms at the test current and a maximum reverse leakage current of 5 µA. It utilizes Category III internal metallurgical bonds and is available in DO-41 axial-lead or D-5A MELF surface-mount packages.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using void-less hard glass with tungsten slugs for robust performance.
• Military qualification per MIL-PRF-19500/406 across JAN, JANTX, JANTXV, and JANS reliability levels.
• Inherently radiation-hardened design suitable for high-reliability environments where failure is not tolerated.

Single Zener Diodes Applications

• High-reliability aerospace systems
• Military-grade voltage regulation circuits
• Harsh environment power supplies

Single Zener Diodes Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these levels dictate the manufacturing lot traceability and screening standards. Confirm whether RoHS compliance is necessary, noting that commercial grade versions are the only ones available in this configuration. Ensure the package type matches your assembly process, as both through-hole and surface mount options exist within the broader series.

Single Zener Diodes Selection Notes

Select the 1N4461 when a precise 6.8 V reference is needed under extreme thermal conditions. Its wide operating temperature range supports applications from -65 °C to +175 °C. Consider the 1.5 W steady-state power dissipation capability for robust load handling. Verify if tighter tolerance variants (2% or 1%) are required, as standard versions offer 5% tolerance.

Single Zener Diodes Part Context

This component belongs to the 1N4460–1N4496 series of industry-recognized Zener voltage regulators. The series provides extensive voltage selections from 3.3 V to 200 V. The 1N4461 specifically addresses mid-range voltage requirements within this broad spectrum, utilizing the same robust glass encapsulation technology found throughout the family.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 6.8 V nominal voltage, 1.5 W power rating, and hermetic sealing requirement. Verify compatibility with MIL-PRF-19500/406 standards if military qualification is mandatory. Surface mount equivalents like the 1N4461US/TR may be considered if board space constraints require D-5A MELF packaging instead of the standard DO-41 axial lead.