1N3029BUR-1

Overview

The Microchip Technology 1N3029BUR-1 is a surface mount Zener diode with a nominal voltage of 24 V and a 5% tolerance. It operates within a temperature range of -55 °C to +175 °C and dissipates up to 1 W. The device features a maximum reverse leakage current of 10 µA, a test current of 10.5 mA, and a dynamic impedance of 25 Ω at the test point. It utilizes a DO-213AB MELF package.

Feature Summary

• Hermetically sealed glass construction with metallurgically bonded internal contacts for enhanced reliability.
• Leadless surface mount design suitable for high-density applications with low parasitic requirements.
• Inherently radiation hard and non-sensitive to electrostatic discharge.

Applications

• Voltage regulation over broad operating current and temperature ranges
• High-reliability military and aerospace electronic systems
• High-density circuit board layouts requiring low parasitic components

Procurement Notes

Verify that the specific part number matches the required military qualification level (JAN, JANTX, or JANTXV) as defined in the manufacturer's nomenclature guide. Confirm RoHS compliance status if applicable, noting that lead-free options may be restricted to commercial grades. Ensure the ordering suffix aligns with the desired packaging format and terminal finish specifications.

Selection Notes

Select this component when a hermetically sealed, surface-mount Zener diode is required for environments demanding high thermal stability and radiation hardness. The DO-213AB package offers a direct footprint alternative to traditional axial leads while maintaining similar electrical characteristics to the JEDEC registered 1N3029B-1 series.

Part Context

This device belongs to the 1N3016BUR-1 through 1N3045BUR-1 series of 1 Watt Surface Mount Zener Diodes. These parts serve as leadless surface mount equivalents to the JEDEC registered 1N3016 through 1N3045 number series, providing a robust solution for applications where space constraints and environmental resilience are critical design factors.

Replacement Considerations

The 1N3029B-1 in a DO-13 package serves as the primary axial-leaded equivalent. Verify pin compatibility and mounting surface Coefficient of Expansion matching when transitioning between package types.

FAQ

What is the maximum junction temperature rating?

The maximum junction and storage temperature rating is +175 °C.

How is polarity indicated on the device?

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