1N3043BUR-1

Single Zener Diodes Overview

The Microchip Technology 1N3043BUR-1 is a 1-watt surface mount Zener diode qualified per MIL-PRF-19500/115. It features a hermetically sealed glass MELF (DO-213AB) package with metallurgically bonded internal construction. The nominal Zener voltage is 91 volts, measured at a test current of 2.8 mA. Maximum reverse leakage current is 10 µA at 69.2 V reverse voltage. Dynamic impedance is 0.25 Ω at the test current and 0.25 Ω near the knee. The device operates within a junction temperature range of -55°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed double plug glass construction for high reliability
• Metallurgically enhanced internal contact design for lower thermal resistance
• Leadless surface mount MELF package suitable for high-density applications
• Inherently radiation hard and non-sensitive to electrostatic discharge

Single Zener Diodes Applications

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

Single Zener Diodes Procurement Notes

Verify the specific suffix against the datasheet nomenclature to confirm tolerance and RoHS status. The 'B' indicates a 5% voltage tolerance. Ensure the ordering code matches the required military qualification level (JAN, JANTX, or JANTXV) if applicable. Confirm that the commercial grade RoHS compliant version is selected if environmental compliance is mandatory for the assembly process.

Single Zener Diodes Selection Notes

Select this component when a 91-volt reference is required in a leadless surface mount form factor. The DO-213AB package offers a smaller footprint compared to axial-leaded equivalents while maintaining similar power dissipation capabilities. Consider the thermal resistance and derating curve for high-temperature environments. Verify that the mounting surface coefficient of expansion matches the device requirements to ensure mechanical integrity during thermal cycling.

Single Zener Diodes Part Context

This part belongs to the 1N3016BUR-1 through 1N3045BUR-1 series of 1-watt surface mount Zener diodes. These devices serve as leadless equivalents to the JEDEC registered 1N3016 through 1N3045 number series originally available in the DO-13 package. The series covers a Zener voltage range from 6.8 volts to 110 volts, providing options for various voltage regulation needs in compact designs.

Single Zener Diodes Replacement Considerations

Direct replacements include other manufacturers' parts meeting the MIL-PRF-19500/115 specification in the DO-213AB package. Equivalent JEDEC types in the 1N30xx series are available in axial packages but require different mounting considerations. Verify pinout polarity and physical dimensions before substituting with non-Microchip components.

Single Zener Diodes FAQ

What is the maximum regulator current for the 1N3043BUR-1?

The maximum Zener current (IZM) is 10 mA.

How is the polarity identified on the 1N3043BUR-1?

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

What is the thermal resistance from junction to end cap?

The thermal resistance (RθJEC) is 50 °C/W.