1N4622-1/TR

Overview

The Microchip Technology 1N4622-1/TR is a 500 mW metallurgically bonded glass Zener diode in the axial-lead DO-35 package. It provides a nominal Zener voltage of 3.9 V with a standard tolerance of ±5%. The device operates at a test current of 250 µA and features a maximum dynamic impedance of 1650 Ohms. It exhibits a maximum reverse leakage current of 2.5 µA and maintains an operating temperature range from -65°C to +175°C.

Feature Summary

• Hermetically sealed internal metallurgical bond for high reliability
• Qualified per MIL-PRF-19500/435 up to JANS level
• Inherently radiation hard design
• Non-sensitive to electrostatic discharge

Applications

• High-reliability military and aerospace circuits
• Voltage regulation over broad current and temperature ranges
• Low-noise reference applications requiring minimal capacitance

Procurement Notes

Verify that the ordering suffix TR indicates tape and reel packaging per EIA-296 standards. Confirm the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for the application, as this affects qualification status. Ensure compatibility with RoHS requirements if applicable, noting that compliance varies by grade.

Selection Notes

Select this component when a hermetically sealed, radiation-hardened Zener diode is required for extreme environments. The 3.9 V output suits low-voltage regulation needs. Consider the high dynamic impedance of 1650 Ohms for circuit stability. Verify thermal derating curves against expected ambient temperatures to ensure power dissipation limits are not exceeded.

Part Context

This part belongs to the 1N4614-1 through 1N4627-1 series of 500 mW Zener regulators. These devices share the same DO-35 axial-lead glass package and metallurgical bonding technology. They offer voltages ranging from 1.8 V to 100 V with various tolerance options, providing a standardized solution for robust voltage regulation across multiple industrial sectors.

Replacement Considerations

Direct substitutes include other parts within the 1N4614-1 through 1N4627-1 series from Microchip Technology. Cross-brand replacements must match the 3.9 V nominal voltage, 500 mW power rating, and DO-35 package dimensions. Verify equivalent MIL-PRF-19500/435 qualification levels for critical applications.