1N3993A

Single Zener Diodes Overview

The Microchip Technology 1N3993A is a 10W Zener diode with a nominal voltage of 3.9V at a test current of 640mA. It features a maximum dynamic impedance of 2.0 Ohms and a temperature coefficient of -0.060%/°C. The device operates within a junction temperature range of -65°C to +175°C, dissipating up to 10W at a case temperature of +55°C. It utilizes a DO-213AA (DO-4) stud-mount package with standard polarity (cathode to stud).

Single Zener Diodes Feature Summary

• Hermetically sealed welded construction with internal solder bond.
• Radiation hard design compliant with MIL-STD-750 method 1020.
• Available in JAN, JANTX, and JANTXV military qualification grades.

Single Zener Diodes Applications

• Voltage regulation over broad current and temperature ranges.
• Military and aerospace electronic systems requiring radiation hardness.
• High-power reference circuits utilizing stud-mount thermal management.

Single Zener Diodes Procurement Notes

Verify the specific reliability level required, as the base part number covers commercial through JANTXV grades. Confirm polarity configuration; the standard 1N3993A has cathode-to-stud polarity, while reverse polarity requires an RA suffix. Ensure mounting hardware specifications align with the 10-32 thread requirements for proper installation.

Single Zener Diodes Selection Notes

Select this component for applications demanding high power dissipation capabilities and robust environmental resilience. The negative temperature coefficient makes it suitable for low-voltage regulation where specific thermal compensation characteristics are needed. Verify that the system can accommodate the large physical footprint and stud-mounting constraints inherent to the DO-4 package.

Single Zener Diodes Part Context

This device belongs to the 1N3993A through 1N3998A series of 10W Zener diodes. These components share the same DO-4 mechanical housing and power rating but differ in breakdown voltage and test current parameters. The series is JEDEC registered and qualified per MIL-PRF-19500/124 for various military reliability levels.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 10W power rating, 3.9V nominal voltage, and DO-4 stud-mount package. Verify that substitute parts maintain the required radiation hardness and hermetic sealing if operating in harsh environments. Check for identical polarity orientation to prevent circuit damage during installation.