1N4743 G

Overview

The Microsemi Corporation 1N4743 G is a Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 13 V with a tolerance of 5%. The device dissipates up to 1 W of power and operates within a temperature range of -65 °C to +200 °C. It utilizes a DO-35-2 through-hole package, has a maximum reverse leakage current of 5 uA, and exhibits a Zener impedance of 10 Ohms at a test current of 19 mA.

Feature Summary

• Provides stable voltage regulation in the 13 V range
• Capable of handling 1 W power dissipation
• Operates reliably across extreme temperatures from -65 °C to +200 °C
• Constructed with glass encapsulation for durability

Applications

• Voltage reference circuits
• Overvoltage protection systems
• Power supply regulation

Procurement Notes

Verify the specific manufacturer designation when sourcing this component, as multiple vendors produce variants under the 1N4743 series. Confirm that the 'G' suffix corresponds to the glass axial leaded package required for your design. Ensure compliance with RoHS directives if applicable to your manufacturing process. Cross-reference datasheets from authorized distributors to validate electrical parameters against your circuit requirements before finalizing procurement.

Selection Notes

Select this component for designs requiring robust voltage clamping in high-temperature environments. The 1 W power rating supports moderate current loads compared to lower-power alternatives. The DO-35 package facilitates easy integration into through-hole PCB layouts. Consider the 5% voltage tolerance when designing precision regulation loops. Evaluate thermal management strategies to ensure the junction temperature remains within the specified operational limits during continuous operation.

Part Context

This part belongs to the standard JEDEC 1N47xx series of silicon Zener diodes. These components are widely used for general-purpose voltage regulation. The 1N4743 variant specifically targets the 13 V market segment. Its glass body construction offers good stability and low noise characteristics. This series is commonly found in industrial and consumer electronics applications requiring reliable DC voltage stabilization.

Replacement Considerations

Equivalent parts include the onsemi 1N4743A and Taiwan Semiconductor 1N4743AHA0G. Verify pinout compatibility and package dimensions before substitution. Check if alternative manufacturers offer tighter voltage tolerances or different operating temperature ranges suitable for your specific application needs.