1N4743AUR

Overview

The 1N4743AUR is a Zener diode manufactured by Microchip Technology, designed for voltage regulation applications. It features a nominal Zener voltage of 12V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 1W and operates within an extended temperature range from -65°C to +175°C. Packaged in the DO-213AB (MELF) surface-mount format, it utilizes a glass encapsulation. Key electrical characteristics include a test current of 20.8mA and a maximum reverse leakage current of 5µA at 9.1V.

Feature Summary

• Provides stable voltage regulation through Zener breakdown mechanism
• Capable of high-temperature operation up to 175°C
• Utilizes hermetic glass MELF package for surface-mount integration

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection in electronic systems
• Clamping applications in signal processing paths

Procurement Notes

Verify component authenticity through authorized Microchip distributors or direct channels. Confirm RoHS compliance status as specific variants may differ. Ensure proper handling procedures are followed due to the glass MELF package construction. Validate that the DO-213AB footprint matches the design requirements before finalizing procurement orders.

Selection Notes

Select this component when a 12V regulation point is required in a surface-mount design. Consider the 1W power rating and ±5% voltage tolerance against circuit load conditions. Evaluate the extended temperature range suitability for harsh environments. Compare physical dimensions of the DO-213AB package against available board space constraints.

Part Context

This part belongs to the standard 1N47xx series of Zener diodes produced by Microchip Technology. The 'AUR' suffix typically denotes the specific surface-mount packaging and testing configuration. It serves as a solid-state alternative to traditional axial-leaded components in modern PCB layouts.

Replacement Considerations

Cross-reference with other manufacturers offering equivalent 12V 1W Zener diodes in DO-213AB packages. Verify matching electrical parameters such as impedance and leakage current. Ensure thermal performance characteristics align with the original design specifications.