1N4109/TR

Single Zener Diodes Overview

The Microchip Technology 1N4109/TR is a 500 mW Zener diode with a nominal voltage of 15 V and a test current of 250 µA. It features a maximum dynamic impedance of 100 Ohms and a maximum reverse leakage current of 40 µA at 11.4 V. The device operates within a temperature range of -65 °C to +175 °C, has a forward voltage of 1.1 V at 200 mA, and utilizes an axial-lead glass DO-35 package.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using metallurgically bonded glass technology for high reliability.
• Qualified per MIL-PRF-19500/435 standards for JAN, JANTX, JANTXV, and JANS levels.
• Low noise density performance, specified at 40 μV / √Hz for voltages of 6.8 V and above.

Single Zener Diodes Applications

• Voltage regulation in high-reliability electronic circuits
• Reference voltage sources in precision measurement systems
• Overvoltage protection in aerospace and defense applications

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 TR suffix is correctly applied for tape and reel packaging requirements.

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 of approximately +0.085 %/°C for thermal stability calculations. Verify power derating curves if operating near the 500 mW limit at elevated temperatures.

Single Zener Diodes Part Context

This device belongs to the 1N4099-1 through 1N4135-1 series of 500 mW Zener diodes manufactured by Microchip Technology. These components are JEDEC registered and designed for robust performance in demanding conditions. The series offers a wide range of voltages from 1.8 V to 100 V with various tolerance options.

Single Zener Diodes Replacement Considerations

1N4109D-1/TR

Single Zener Diodes FAQ

What is the maximum noise density for the 1N4109?

The maximum noise density is 40 μV / √Hz, measured at the test current of 250 µA.

Is the 1N4109/TR radiation hard?

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