1N4127-1

Single Zener Diodes Overview

The Microchip Technology 1N4127-1 is a 500 mW metallurgically bonded glass Zener diode in an axial-lead DO-35 package. It provides a nominal Zener voltage of 56 V with a test current of 250 µA. The device features a maximum Zener impedance of 0.01 Ω and a maximum reverse current of 40 µA at the specified voltage. Noise density is limited to 40 µV/√Hz. It operates within a junction temperature range of -65°C to +175°C and offers thermal resistance values of 300 °C/W (junction-to-ambient) and 250 °C/W (junction-to-lead).

Single Zener Diodes Feature Summary

• Internal metallurgical bond construction for high reliability.
• Qualified per MIL-PRF-19500/435 for JAN, JANTX, JANTXV, and JANS levels.
• Hermetically sealed axial-lead glass DO-35 package.
• Inherently radiation hard design.

Single Zener Diodes Applications

• High-reliability voltage regulation in military and aerospace systems.
• Reference voltage sources requiring low noise characteristics.
• Protection circuits in environments subject to radiation exposure.

Single Zener Diodes Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these are distinct qualification levels. Confirm RoHS compliance status if environmental regulations apply, noting that RoHS versions are commercial grade only. Ensure the ordering suffix matches the desired tolerance and packaging configuration. Consult factory documentation for tape and reel availability details.

Single Zener Diodes Selection Notes

Select this component when a stable 56 V reference is needed in a ruggedized axial-lead form factor. Consider the negative temperature coefficient near breakdown for lower voltages versus positive coefficients at higher voltages. Evaluate the power derating curve for ambient temperature conditions exceeding 25°C. Verify that the maximum regulator current of 6.7 mA meets the circuit load requirements.

Single Zener Diodes Part Context

This part belongs to the 1N4614-1 through 1N4627-1e3 and 1N4099-1 through 1N4135-1e3 series. These devices share common construction techniques and qualification standards. The series covers Zener voltages from 1.8 V to 100 V. Other packages like DO-213AA and DO-216 are available for surface mount applications within the same family.

Single Zener Diodes FAQ

What is the temperature coefficient for the 1N4127-1?

The maximum temperature coefficient of regulator voltage is +0.100 %/°C.

How is the Zener impedance measured?

It is derived by superimposing a 60 Hz rms ac current at 10% of IZT (25 µA) on the DC test current IZT.