1N4479US

Single Zener Diodes Overview

The Microchip Technology 1N4479US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 39 V. It operates within a junction temperature range of -65 °C to +175 °C and dissipates up to 1.5 W at 25 °C ambient. The device features a maximum dynamic impedance of 30 Ohms at the test current of 6.5 mA, with a maximum reverse leakage current of 37 µA at 31.2 V. It utilizes a D-5A (SQ-MELF) package.

Single Zener Diodes Feature Summary

• Hermetically sealed void-less glass construction with internal metallurgical bonds for high reliability.
• Qualified per MIL-PRF-19500/406 for JAN, JANTX, JANTXV, and JANS levels.
• Inherently radiation hard and non-sensitive to electrostatic discharge.

Single Zener Diodes Applications

• High-reliability applications where failure cannot be tolerated.
• Voltage regulation over broad operating current and temperature ranges.
• Military and aerospace electronic circuits.

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required military qualification level (JAN, JANTX, JANTXV, or JANS), as these designations define the reliability grade. Confirm RoHS compliance status if applicable, noting that commercial versions may differ from qualified levels. Ensure the package type corresponds to the D-5A MELF form factor specified in the datasheet.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed surface mount Zener diode is required for harsh environments. The 1.5 W power rating supports steady-state operation at elevated temperatures with appropriate derating. Verify that the 39 V nominal voltage aligns with circuit requirements and check the 30 Ohm dynamic impedance against signal modulation needs.

Single Zener Diodes Part Context

This part belongs to the 1N4460US through 1N4496US series of industry-recognized 1.5 W Zener regulators. These devices serve as surface mount equivalents to popular JEDEC registered axial-lead series, offering robust construction suitable for replacing traditional through-hole components in modern PCB layouts.

Single Zener Diodes Replacement Considerations

Equivalent parts include JAN1N4479CUS, JAN1N4479DUS, JANTX1N4479CUS, JANTX1N4479DUS, JANTXV1N4479CUS, and JANTXV1N4479DUS.

Single Zener Diodes FAQ

What is the thermal resistance from junction to end cap?

The thermal resistance from junction to end cap is 20 °C/W.

Is the device sensitive to electrostatic discharge?

No, the device is non-sensitive to ESD per MIL-STD-750 method 1020.