1N4478

Single Zener Diodes Overview

The Microchip Technology 1N4478 is a 36 V Zener voltage regulator diode with a 5% tolerance. It features a maximum dynamic impedance of 27 Ohms at a test current of 7 mA and a maximum reverse leakage current of 0.05 µA at 28.8 V. The device supports a steady-state power dissipation of 1.5 W and operates within a junction temperature range of -65 °C to +175 °C.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass package with internal metallurgical bonds
• Military qualification per MIL-PRF-19500/406
• Inherently radiation hard construction

Single Zener Diodes Applications

• High-reliability voltage regulation
• Radiation-hardened circuit protection
• Broad operating current and temperature range stabilization

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix (e.g., US, DUS) to confirm the required reliability level and package type. Confirm RoHS compliance status if environmental regulations apply, as commercial versions differ from military grades. Check for availability of tape and reel options versus bulk packaging based on assembly requirements.

Single Zener Diodes Selection Notes

Select this component for applications requiring robust surface mount or axial lead configurations with high thermal stability. Ensure the design accounts for the 1.5 W power rating and derating curves. Verify that the 36 V breakdown voltage aligns with the target circuit's reference needs.

Single Zener Diodes Part Context

This part belongs to the 1N4460–1N4496 series of industry-recognized Zener voltage regulators. The series offers selections from 3.3 to 200 volts with standard 5% tolerance. It is designed for environments where failure cannot be tolerated, providing flexible mounting terminals and non-sensitive ESD characteristics.

Single Zener Diodes Replacement Considerations

Equivalent parts include JAN1N4478CUS, JAN1N4478DUS, JANTX1N4478CUS, JANTX1N4478DUS, JANTXV1N4478US, and JANTXV1N4478US/TR.