1N4743UR-1

Overview

The 1N4743UR-1 is a Zener diode manufactured by Microchip Technology, designed for voltage regulation applications. It utilizes a glass MELF (DO-213AB) surface-mount package and operates with a maximum power dissipation of 1 watt. The device features a nominal Zener voltage of 10 volts with a standard tolerance of 5 percent. It is constructed from silicon and supports unidirectional operation within an extended temperature range, typically up to 175 degrees Celsius for high-reliability variants.

Feature Summary

• Provides stable voltage regulation through a hermetically sealed glass MELF package construction.
• Features internal metallurgical bonding between the die and metal slugs for enhanced structural integrity.
• Designed for high-reliability performance suitable for demanding industrial and aerospace environments.

Applications

• Voltage reference circuits in precision measurement equipment
• Overvoltage protection stages in aerospace and defense systems
• Power supply regulation modules requiring surface-mount integration

Procurement Notes

Verify the specific suffix configuration against official Microchip documentation to ensure correct tolerance and screening levels. Confirm RoHS compliance status as it varies by manufacturing batch and region. Check current availability constraints, as this component may be subject to restricted supply conditions or long lead times due to its specialized high-reliability classification.

Selection Notes

Select this component when a robust surface-mount Zener diode is required for critical voltage regulation tasks. Ensure the circuit design accommodates the 1-watt power dissipation limit and the specific thermal characteristics of the DO-213AB package. Validate that the 10-volt nominal rating aligns precisely with the system's reference requirements before finalizing the bill of materials.

Part Context

This part belongs to the 1N4743 series of Zener diodes produced by Microchip Technology. It serves as the surface-mount equivalent of traditional axial-leaded regulators, offering comparable electrical performance in a compact form factor. The series is widely recognized for its reliability in harsh environments, supporting both commercial and military-grade specifications depending on the selected variant.

Replacement Considerations

Direct substitutes include other 1N4743 series variants from Microchip, such as the 1N4743AUR-1E3/TR, provided the pinout and electrical parameters match exactly. Cross-manufacturer replacements require careful verification of the MELF package dimensions and thermal resistance values to ensure compatibility with existing board layouts.