1N4112 (DO35)

Single Zener Diodes Overview

The Microsemi 1N4112 is a silicon Zener diode with an 18V nominal voltage and 5% tolerance. It operates in the DO-35 (DO-204AH) glass axial-lead package, rated for 0.5W power dissipation at 25°C lead temperature. The device features an internal metallurgical bond and hermetic sealing. Electrical characteristics include a test current of 250µA, maximum impedance of 100Ω, reverse current of 13.7µA, noise density of 40µV/√Hz, and a temperature coefficient of +0.090%/°C.

Single Zener Diodes Feature Summary

• Internal metallurgical bond construction
• Hermetically sealed glass DO-35 package
• Low noise density performance
• Radiation hard design

Single Zener Diodes Applications

• Voltage regulation over broad current and temperature ranges
• High reliability military applications requiring JANS qualification
• Low noise circuit designs

Single Zener Diodes Procurement Notes

Verify the specific suffixes to confirm the required reliability level (JAN, JANTX, JANTXV, or JANS) and RoHS compliance status. Ensure the metallurgically bonded variant is selected if specified by the design requirements. Confirm that the ordering information matches the exact JEDEC type number and tolerance class needed for the application.

Single Zener Diodes Selection Notes

Select this component when a stable 18V reference is required in a through-hole glass package. Consider the positive temperature coefficient for thermal stability analysis. Evaluate the low noise specification against circuit sensitivity requirements. Verify that the operating environment falls within the -65°C to +175°C junction temperature range.

Single Zener Diodes Part Context

This part belongs to the 1N4099-1 through 1N4135-1 series of 500mW Zener regulators. These devices are designed for high-reliability environments and offer tight voltage tolerances. The series provides extensive selection from 1.8V to 100V in standard axial-lead packages suitable for demanding industrial and aerospace applications.

Single Zener Diodes Replacement Considerations

Equivalent parts must match the 18V Zener voltage, 5% tolerance, and DO-35 package dimensions. Verify that any substitute also offers hermetic sealing and comparable noise density specifications to maintain circuit performance integrity.

Single Zener Diodes FAQ

What is the temperature coefficient for the 1N4112?

The maximum temperature coefficient of regulator voltage is +0.090%/°C.

Is the 1N4112 radiation hard?

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