1N4109-1

Single Zener Diodes Overview

The Microchip Technology 1N4109-1 is a 500 mW metallurgically bonded glass Zener diode in an axial-lead DO-35 package. It provides a nominal Zener voltage of 15 V with a 5% tolerance at a test current of 250 µA. The device features a maximum dynamic impedance of 100 Ohms and a reverse leakage current of 40 µA. It operates within a junction temperature range of -65 °C to +175 °C, offering a positive temperature coefficient of +0.085 %/°C.

Single Zener Diodes Feature Summary

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

Single Zener Diodes Applications

• Voltage regulation over broad ranges of current and temperature
• High reliability applications requiring radiation hardness
• Flexible axial-lead mounting terminals

Single Zener Diodes Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as the base part number covers multiple qualification grades. Confirm RoHS compliance status if environmental regulations apply, noting that RoHS versions are available on commercial grade only. Ensure the ordering suffix matches the desired tolerance and packaging configuration.

Single Zener Diodes Selection Notes

Select this component when a stable 15 V reference is needed in harsh environments. The DO-35 package supports through-hole mounting. Consider the positive temperature coefficient (+0.085 %/°C) for thermal stability requirements. Verify power derating curves if operating above 25 °C lead temperature, as rated dissipation decreases linearly up to 175 °C.

Single Zener Diodes Part Context

This device belongs to the 1N4099-1 through 1N4135-1 series of 500 mZener diodes. These parts share the same DO-35 axial-lead glass package and metallurgical bond technology. The series spans voltages from 1.8 V to 100 V, allowing designers to standardize on a single package type across various voltage regulation needs while maintaining high-reliability qualifications.

Single Zener Diodes Replacement Considerations

Direct substitutes include other 1N4109-1 variants from different manufacturers meeting MIL-PRF-19500/435 specifications. Commercial equivalents like the 1N4109 without the '-1' suffix lack the metallurgical bond and military qualification. Verify pinout compatibility and ensure replacement parts match the required JANS/JANTX reliability level.

Single Zener Diodes FAQ

What is the temperature coefficient for the 1N4109-1?

The temperature coefficient is +0.085 %/°C.

Is the 1N4109-1 radiation hard?

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

What is the maximum reverse leakage current?

The maximum reverse current is 40 µA.