1N5229BUR-1

Single Zener Diodes Overview

The Microchip Technology 1N5229BUR-1 is a hermetically sealed, metallurgically bonded glass surface mount Zener diode in the DO-213AA (MELF) package. It provides a nominal Zener voltage of 4.3 V with a 5% tolerance at a test current of 20 mA. The device features a maximum steady-state power dissipation of 0.5 W and operates within a junction temperature range of -65°C to +175°C. Key electrical parameters include a maximum dynamic impedance of 22 Ohms at IZT and 2000 Ohms at IZK=0.25 mA, a maximum reverse leakage current of 5 µA at VR=4.3 V, and a temperature coefficient of +/-0.055 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed metallurgically bonded glass surface mount package
• Inherently radiation hard per Microsemi specifications
• Non-sensitive to electrostatic discharge
• Minimal capacitance characteristics

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges
• Satellite communications systems
• Aerospace and defense electronics
• High-reliability circuit protection

Single Zener Diodes Procurement Notes

Verify that the ordering suffix matches the required voltage tolerance and RoHS compliance status. Confirm whether MIL-PRF-19500 screening levels are necessary for the specific application environment. Ensure the supplier documentation explicitly references the Microsemi datasheet T4-LDS-0232-1 for accurate parameter validation.

Single Zener Diodes Selection Notes

Select this component when a surface mount equivalent to the axial 1N5229B is required. Consider the 4.3 V breakdown voltage and 5% tolerance limits. Evaluate the thermal resistance and derating curves if ambient temperatures exceed standard operating conditions. Verify compatibility with automated assembly processes due to the MELF form factor.

Single Zener Diodes Part Context

This part belongs to the 1N5221BUR-1 through 1N5281BUR-1 series of 0.5 watt Zener voltage regulators. The series offers a surface mount alternative to the JEDEC registered 1N5221 to 1N5281 axial series. Voltage tolerances ranging from 1% to 10% are available across the series depending on the specific suffix letter assigned to the part number.

Single Zener Diodes Replacement Considerations

The 1N5229B serves as the direct axial leaded equivalent. Other series members like 1N5228BUR-1 or 1N5230BUR-1 provide adjacent voltage ratings.