1N4623-1

Single Zener Diodes Overview

The Microchip Technology 1N4623-1 is a 500 mW metallurgically bonded glass Zener diode in an axial-lead DO-35 package. It provides a nominal Zener voltage of 4.3 V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and features a maximum dynamic impedance of 1600 Ohms at a test current of 250 µA.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using internal metallurgical bonding for high reliability.
• Qualified per MIL-PRF-19500/435 for JAN, JANTX, JANTXV, and JANS levels.
• Inherently radiation hard as described in Microsemi MicroNote 050.

Single Zener Diodes Applications

• High-reliability military and aerospace circuits
• Voltage regulation over broad ranges of current and temperature
• Radiation-hardened electronic systems

Single Zener Diodes Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these designations indicate different qualification standards under MIL-PRF-19500/435. Confirm that the component meets all environmental and testing requirements specified in the datasheet before integration into production designs.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed, radiation-tolerant Zener regulator is needed. Ensure the circuit design accommodates the 500 mW power dissipation limit and the linear derating curve starting at 50°C lead temperature. Verify that the 4.3 V breakdown voltage aligns with the system's reference requirements.

Single Zener Diodes Part Context

This part belongs to the 1N4614-1 through 1N4627-1 series of 500 mZener diodes. These devices are JEDEC registered and offer voltages from 1.8 to 100 V. They are available in axial-lead DO-35 packages and surface mount options like DO-213AA.

Single Zener Diodes Replacement Considerations

Direct substitutes include other manufacturers' parts meeting MIL-PRF-19500/435 specifications for the 1N4623-1 designation. Ensure any replacement matches the 4.3 V nominal voltage, 500 mW power rating, and DO-35 package dimensions.

Single Zener Diodes FAQ

What is the maximum noise density for the 1N4623-1?

The maximum noise density is 2.0 µV/√Hz at the test current of 250 µA.

How does the power dissipation change with temperature?

The 0.5 W rating must be linearly derated starting at a lead temperature of 50°C and goes to zero at 175°C.