1N4112-1

Single Zener Diodes Overview

The Microchip Technology 1N4112-1 is a 500 mW metallurgically bonded glass Zener diode in the axial-lead DO-35 package. It provides an 18 V nominal Zener voltage with a standard ±5% tolerance. The device operates within a junction temperature range of -65 °C to +175 °C and features a maximum reverse leakage current of 13.7 µA at the specified test voltage. Electrical characteristics include a dynamic impedance of 0.05 Ω, a maximum noise density of 40 µV/√Hz, and a positive temperature coefficient of +0.090 %/°C.

Single Zener Diodes Feature Summary

• Constructed with an internal metallurgical bond for high reliability.
• Hermetically sealed in an axial-lead glass DO-35 package.
• Inherently radiation hard per Microsemi MicroNote 050.
• Qualified to JAN, JANTX, JANTXV, and JANS levels under MIL-PRF-19500/435.

Single Zener Diodes Applications

• Voltage regulation over broad ranges of current and temperature
• High reliability aerospace and defense circuits
• Reference voltage sources requiring low capacitance

Single Zener Diodes Procurement Notes

Verify the specific qualification level (JAN, JANTX, JANTXV, or JANS) required for your application, as these levels dictate the manufacturing lot traceability and screening standards. Confirm RoHS compliance status, noting that compliant versions are available only on commercial grades. Ensure ordering suffixes match the desired packaging format, such as tape and reel options.

Single Zener Diodes Selection Notes

Select this component when a stable 18 V reference is needed in harsh environments due to its wide operating temperature range and radiation hardness. Consider the low dynamic impedance and minimal capacitance for precision applications. Evaluate the power derating curve if ambient temperatures exceed 25 °C to ensure the 500 mW rating remains within safe limits.

Single Zener Diodes Part Context

This part belongs to the 1N4099-1 through 1N4135-1 series of 500 mZener regulators. These devices cover a voltage range from 1.8 V to 100 V and are JEDEC registered. They share common construction features, including the DO-35 glass package and metallurgical bonding technology designed for durability in demanding electronic systems.

Single Zener Diodes Replacement Considerations

Equivalent parts within the same series include 1N4111-1 and 1N4113-1. Verify that any substitute matches the exact Zener voltage, tolerance class, and required reliability qualification level.

Single Zener Diodes FAQ

What is the polarity orientation for Zener regulation?

The diode must be operated with the banded end positive with respect to the opposite end to achieve Zener regulation.

How is the Zener impedance derived?

It is derived by superimposing a 60 Hz rms AC current at 10% of the test current onto the DC test current.