1N6485

Overview

The Microchip Technology 1N6485 is a military-qualified Zener voltage regulator featuring a hermetically sealed voidless glass package. It provides a nominal Zener voltage of 3.3 V with a standard tolerance of 5%. The device 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. Electrical characteristics include a maximum dynamic impedance of 10 Ohms, a test current of 76 mA, and a maximum reverse leakage current of 50 µA.

Feature Summary

• Hermetically sealed construction using voidless hard glass with tungsten slugs for robust performance in high-reliability environments.
• Qualified per MIL-PRF-19500/406 standards across JAN, JANTX, JANTXV, and JANS reliability levels.
• Inherently radiation hard as described in Microsemi MicroNote 050.
• Non-sensitive to electrostatic discharge (ESD) per MIL-STD-750 method 1020.

Applications

• High-reliability aerospace systems where component failure is not tolerated.
• Military-grade voltage regulation circuits requiring broad operating current stability.
• Radiation-hardened electronic subsystems.

Procurement Notes

Verify the specific qualification level required for your application, as the 1N6485 series is available in JAN, JANTX, JANTXV, and JANS variants. Confirm RoHS compliance status, noting that compliant versions are restricted to commercial grades only. Ensure ordering suffixes match the desired tolerance and packaging specifications before procurement.

Selection Notes

Select the appropriate tolerance suffix based on circuit precision requirements; standard versions offer 5% tolerance, while tighter tolerances require specific suffixes. Consider the thermal impedance characteristics when designing heat dissipation paths, as the device supports steady-state power dissipation up to 1.5 W. Verify lead length and mounting style compatibility with the DO-41 axial-lead package dimensions.

Part Context

This component belongs to the 1N6485–1N6491 series of industry-recognized 1.5-watt Zener voltage regulators. These devices are designed for applications demanding extreme durability and consistent voltage regulation. The series complements the broader 1N4460–1N4496 lineup, offering specialized low-voltage options with distinct internal metallurgical bond categories optimized for high-reliability deployment.

Replacement Considerations

Direct replacements must maintain the same MIL-PRF-19500/406 qualification level and DO-41 package form factor. Equivalent parts should be verified against the electrical characteristics table for matching Zener voltage, dynamic impedance, and thermal ratings to ensure functional parity in critical circuits.