1N4118/TR

Single Zener Diodes Overview

The Microchip Technology 1N4118/TR is a 500 mW metallurgically bonded glass Zener diode in the axial-lead DO-35 package. It provides a nominal Zener voltage of 27 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 leakage current of 20.5 µA at 20.5 V. It includes a tape and reel option for automated assembly.

Single Zener Diodes Feature Summary

• Internal metallurgical bond construction for enhanced reliability
• Hermetically sealed axial-lead glass DO-35 package
• Qualified per MIL-PRF-19500/435 for high-reliability applications
• Low noise density characteristics suitable for precision regulation

Single Zener Diodes Applications

• Voltage regulation over broad ranges of current and temperature
• High-reliability military and aerospace circuits
• Precision reference voltage generation

Single Zener Diodes Procurement Notes

Verify the specific qualification level (JAN, JANTX, JANTXV, or JANS) required for your application, 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 TR suffix matches your automated handling equipment specifications.

Single Zener Diodes Selection Notes

Select this component when a robust, hermetically sealed Zener regulator is needed for harsh environments. The internal metallurgical bond offers superior stability compared to non-bonded types. Consider the 27 V nominal voltage and ±5% tolerance against your circuit requirements. Evaluate the 500 mW power dissipation capability relative to your thermal management design.

Single Zener Diodes Part Context

This device belongs to the 1N4099-1 through 1N4135-1 series of 500 mW metallurgically bonded glass Zener diodes. These parts are JEDEC registered equivalents to the 1N4099 through 1N4135 series. The series spans voltages from 1.8 V to 100 V, offering various tolerance options including 5%, 2%, and 1%.

Single Zener Diodes Replacement Considerations

Direct parameter-equivalent substitutes include JAN1N4118-1, JANTX1N4118-1, JANTXV1N4118D-1, and JANS1N4118-1. Verify that any replacement maintains the required MIL-PRF-19500/435 qualification level and metallurgical bond construction.