1N4123/TR

Single Zener Diodes Overview

The Microchip Technology 1N4123/TR is a 500 mW metallurgically bonded glass Zener diode in the axial-lead DO-35 package. It provides a nominal Zener voltage of 39 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 reverse current of 40 µA at the specified test voltage. Electrical characteristics include a dynamic impedance of 0.01 Ω, a maximum noise density of 40 µV/√Hz, and a positive temperature coefficient of +0.095 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using an internal metallurgical bond for high reliability.
• Capable of regulating voltage across broad ranges of current and temperature variations.
• Qualified per MIL-PRF-19500/435 standards for JAN, JANTX, JANTXV, and JANS levels.

Single Zener Diodes Applications

• High-reliability voltage regulation circuits
• Military and aerospace electronic systems
• Precision reference voltage generation

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required qualification level (JAN, JANTX, JANTXV, or JANS) as the base part number covers multiple reliability grades. Confirm RoHS compliance status if environmental regulations apply, noting that commercial versions may differ from military-qualified units. Ensure the tape and reel packaging option aligns with automated assembly requirements.

Single Zener Diodes Selection Notes

Select this component when a stable 39 V reference is needed in harsh environments requiring hermetic sealing. Consider the positive temperature coefficient for thermal compensation needs. Evaluate the low dynamic impedance for applications demanding minimal signal variation under load changes. Verify power derating curves against expected ambient temperatures to ensure safe operation within the 500 mW limit.

Single Zener Diodes Part Context

This device belongs to the 1N4099-1 through 1N4135-1 series of 500 mZener diodes manufactured by Microchip Technology. These components are JEDEC registered and designed for robust performance in critical applications. The series offers extensive voltage selection from 1.8 V to 100 V with various tolerance options.

Single Zener Diodes Replacement Considerations

Compatible substitutes include other 1N4123 variants such as 1N4123D-1 or 1N4123C-1, which offer tighter voltage tolerances. Cross-reference with equivalent MIL-PRF-19500/435 qualified parts from other manufacturers if supply constraints exist.

Single Zener Diodes FAQ

What is the temperature coefficient for the 1N4123?

The maximum temperature coefficient of regulator voltage is +0.095 %/°C.

Is the 1N4123 radiation hard?

Yes, the device is inherently radiation hard as described in Microsemi MicroNote 050.