1N4109-1/TR

Single Zener Diodes Overview

The Microchip Technology 1N4109-1/TR is a 500 mW metallurgically bonded glass Zener diode in the axial-lead DO-35 package. It provides a nominal Zener voltage of 15 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 50 nA at 11.4 V. Electrical characteristics include a test current (IZT) of 250 µA, a dynamic impedance (ZZT) of 100 Ohms, and a forward voltage of 1.1 V at 200 mA.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using an internal metallurgical bond for high reliability.
• Capable of regulating voltage across broad ranges of current and temperature variations.
• Qualified per MIL-PRF-19500/435 standards for JAN, JANTX, JANTXV, and JANS levels.

Single Zener Diodes Applications

• Voltage regulation in military and aerospace circuits
• High-reliability power supply reference designs
• Radiation-hardened electronic systems

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required qualification level and packaging format. Confirm RoHS compliance status if applicable, as commercial versions differ from mil-qualified units. Ensure the tape and reel configuration aligns with automated assembly requirements before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a stable 15 V reference is needed in a through-hole axial package. Consider the 100 Ohm dynamic impedance and low noise density for precision applications. Verify thermal derating curves against the expected ambient operating conditions to ensure the 500 mW rating remains sufficient.

Single Zener Diodes Part Context

This part belongs to the 1N4099-1 through 1N4135-1 series of 500 mZener diodes. These devices are JEDEC registered and offer voltages ranging from 1.8 V to 100 V. They are designed for high-reliability environments requiring hermetic sealing and radiation hardness.

Single Zener Diodes Replacement Considerations

Equivalent parts within the same series include 1N4109D-1 for tighter tolerances or 1N4109UR-1 for surface mount variants. Verify pinout compatibility and thermal resistance values when substituting.

Single Zener Diodes FAQ

What is the maximum noise density for the 1N4109-1?

The maximum noise density is 11.4 μV/√Hz at the specified test current of 250 µA.

How is polarity indicated on the DO-35 package?

Polarity is indicated by a band on the cathode end. The banded end must be positive with respect to the opposite end for Zener regulation.