1N4108

Single Zener Diodes Overview

The Microchip Technology 1N4108 is a 500 mW metallurgically bonded glass Zener diode with a nominal voltage of 14 V. It operates within a temperature range of -65 °C to +175 °C and features a maximum reverse leakage current of 50 nA at 10.7 V. The device exhibits a dynamic impedance of 200 Ohms, a test current of 250 µA, and a forward voltage of 1.1 V at 200 mA. It is housed in an axial-lead DO-35 (DO-204AH) package.

Single Zener Diodes Feature Summary

• Internal metallurgical bond for structural integrity
• Hermetically sealed glass DO-35 package
• Low noise density characteristics
• Radiation hard design

Single Zener Diodes Applications

• Voltage regulation over broad current ranges
• High reliability military applications
• ESD non-sensitive circuit protection

Single Zener Diodes Procurement Notes

Verify the specific qualification level required, as the base part number covers commercial through JANS grades. Confirm RoHS compliance status if environmental regulations apply, noting that compliance is restricted to commercial versions. Ensure the ordering suffix matches the desired tolerance and packaging format.

Single Zener Diodes Selection Notes

Select based on the required Zener voltage tolerance, which varies by suffix. Consider the operating temperature range and power derating requirements above 50 °C. Verify the necessary radiation hardness or MIL-PRF-19500/435 qualification level for the intended application environment.

Single Zener Diodes Part Context

This component belongs to the 1N4099-1 through 1N4135-1 series of 500 mW Zener diodes. It is available in multiple reliability levels including JAN, JANTX, JANTXV, and JANS. Surface mount alternatives exist in DO-213AA and DO-216 packages.

Single Zener Diodes Replacement Considerations

1N4108/TR

Single Zener Diodes FAQ

What is the maximum noise density specification?

The maximum noise density is 40 μV / √Hz for voltages of 6.8 V and higher.

How is polarity indicated on the device?

Polarity is marked by a band; the banded end must be positive relative to the opposite end for Zener regulation.