1N4112/TR

Single Zener Diodes Overview

The Microchip Technology 1N4112/TR is a 500 mW metallurgically bonded glass Zener diode in the axial-lead DO-35 package. It provides a nominal Zener voltage of 18 V with a standard tolerance of ±5%. The device operates at a test current of 250 µA and features a maximum dynamic impedance of 100 Ohms. It exhibits a reverse leakage current of 13.7 µA and a noise density of 40 µV/√Hz. The temperature coefficient is +0.090 %/°C, and it supports an operating junction temperature range from -65 °C to +175 °C.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using internal metallurgical bonding for high reliability.
• Qualified per MIL-PRF-19500/435 for JAN, JANTX, JANTXV, and JANS levels.
• Low noise density performance suitable for precision regulation applications.

Single Zener Diodes Applications

• Voltage regulation in radiation-hardened aerospace systems
• Precision reference circuits requiring low noise characteristics
• High-reliability industrial electronics

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required reliability level (JAN, JANTX, JANTXV, or JANS) as commercial versions may differ in qualification standards. Confirm RoHS compliance status if applicable, noting that certain military grades may not be compliant. Ensure the tape and reel packaging aligns with automated assembly requirements before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a stable 18 V reference is needed within the 500 mW power dissipation class. Consider the positive temperature coefficient for thermal stability analysis. Verify that the DO-35 axial lead form factor fits the mechanical constraints of the target printed circuit board layout.

Single Zener Diodes Part Context

This part belongs to the 1N4099-1 through 1N4135-1 series of 500 mZener regulators manufactured by Microchip Technology. These devices are designed for demanding environments where long-term stability and radiation hardness are critical. The series covers a wide voltage range from 1.8 V to 100 V.

Single Zener Diodes Replacement Considerations

Consult official substitution lists for equivalent parts such as the 1N4112 without the TR suffix for bulk packaging variants. Cross-reference with other manufacturers' MIL-PRF-19500 qualified equivalents if supply chain constraints require alternative sourcing options.

Single Zener Diodes FAQ

What is the maximum noise density specified for the 1N4112?

The maximum noise density is specified as 40 µV/√Hz at the test current of 250 µA.

Does the 1N4112 support surface mount mounting?

No, the 1N4112/TR is packaged in the axial-lead DO-35 style. Surface mount versions are available in different part numbers within the same series.