1N3157

Overview

The Microchip Technology 1N3157 is an 8.4 V nominal temperature compensated Zener reference diode housed in a hermetically sealed glass DO-7 (DO-204AA) axial-lead package. It operates at a test current of 10 mA with a maximum impedance of 15 Ohms and reverse leakage current of 10 µA at 5.5 V. The device provides exceptional thermal stability, featuring a maximum effective temperature coefficient of 0.001 %/°C over a -55°C to +100°C range. It supports DC power dissipation up to 500 mW and withstands operating temperatures from -65°C to +175°C.

Feature Summary

• Provides minimal voltage change across broad temperature ranges for stable reference applications
• Features internal metallurgical bonds within a hermetically sealed glass case
• Offers flexible axial-lead mounting terminals suitable for standard through-hole assembly

Applications

• Instrumentation circuits requiring high-stability voltage references
• Precision analog circuit designs demanding low thermal drift
• Military and aerospace systems utilizing JAN or JANTX qualified variants

Procurement Notes

Verify the specific suffix requirements when ordering, as military qualifications require JAN, JANTX, or JANTXV prefixes alongside the -1 suffix. Confirm RoHS compliance needs by checking for the e3 suffix on commercial parts. Ensure the selected variant matches the required temperature coefficient and tolerance specifications for your design constraints.

Selection Notes

Select the 1N3157 specifically for its industry-leading 0.001 %/°C temperature coefficient among the JEDEC registered series. Consider tighter voltage tolerances by adding percentage suffixes if standard 5% accuracy is insufficient. Evaluate the need for radiation-hardened RH-prefix versions or military-grade packaging based on environmental exposure and reliability standards.

Part Context

This component belongs to the popular 1N3154 through 1N3157A series of Zero-TC Reference Diodes manufactured by Microsemi (now Microchip Technology). The series offers various temperature coefficients ranging from 0.01%/°C down to 0.001%/°C, all centered around an 8.4 V nominal voltage. These devices are widely recognized for their precision and stability in critical electronic applications.

Replacement Considerations

Direct replacements include other members of the 1N315x series such as 1N3156 or 1N3155, though these exhibit higher temperature coefficients. For equivalent performance, verify that substitute parts match the 0.001 %/°C stability requirement and the 8.4 V nominal voltage specification.