1N4476/TR

Single Zener Diodes Overview

The Microchip Technology 1N4476/TR is a 30 V Zener voltage regulator with a 1.5 W power dissipation rating, housed in a DO-41 axial lead package and supplied in tape and reel format. It features a standard 5% voltage tolerance, a test current of 8.5 mA, and a maximum dynamic impedance of 20 Ohms at the test point. The device operates within a junction temperature range of -65°C to +175°C, exhibits a maximum reverse leakage current of 50 µA at 24 V, and supports a continuous forward current of 1 A.

Single Zener Diodes Feature Summary

• Hermetically sealed void-less glass construction utilizing internal metallurgical bonds for robust reliability.
• Triple-layer passivation providing inherent radiation hardness and non-sensitivity to electrostatic discharge.
• Flexible axial-lead mounting terminals designed for high-reliability applications where failure cannot be tolerated.

Single Zener Diodes Applications

• Voltage regulation across broad operating current and temperature ranges
• High-reliability military and aerospace circuits requiring MIL-PRF-19500/406 qualification
• Radiation-hardened electronic systems

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required tape and reel packaging configuration. Confirm whether the component requires JAN, JANTX, JANTXV, or JANS military qualification levels, as these affect compliance and availability. Ensure the requested version aligns with RoHS requirements, noting that compliant versions are available only on commercial grades.

Single Zener Diodes Selection Notes

Select this component when a 30 V breakdown voltage with 1.5 W steady-state power dissipation is required in an axial lead package. Consider the 20 Ohm dynamic impedance and 50 µA maximum reverse leakage current for circuit stability. Verify that the operating environment falls within the specified -65°C to +175°C junction temperature range.

Single Zener Diodes Part Context

This part belongs to the 1N4460 through 1N4496 series of industry-recognized 1.5 watt Zener voltage regulators. These devices are JEDEC registered and offer extensive voltage selections from 3.3 to 200 volts. The series is characterized by its void-less hermetically sealed glass package and internal Category 1 metallurgical bonds.

Single Zener Diodes Replacement Considerations

Direct replacements include other 1N4476 variants such as the 1N4476US (SQ-MELF surface mount) or different qualification levels like JAN1N4476. Verify package compatibility and electrical tolerances before substitution.

Single Zener Diodes FAQ

Is the 1N4476/TR sensitive to electrostatic discharge?

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

What is the maximum surge current capability of the 1N4476?

The maximum Zener surge current (IZSM) is 0.48 Amps for an 8.3 ms square wave.