1N4730AP/TR8

Overview

The Microsemi Corporation 1N4730AP/TR8 is a single silicon Zener diode housed in the DO-204AL (DO-41) axial leaded package. It provides a nominal Zener voltage of 3.9 V with a maximum power dissipation rating of 1 W. The component features a standard tolerance of ±5% and operates within a temperature range of -65°C to +150°C. Electrical characteristics include a maximum reverse leakage current of 50 µA at 1 V, a forward voltage drop of 1.2 V at 200 mA, and a maximum Zener impedance of 9 Ohms.

Feature Summary

• Provides stable voltage regulation for general-purpose applications using a single unidirectional silicon junction.
• Features plastic encapsulation designed for lower thermal resistance compared to glass-body alternatives.
• Offers flexible mounting options through an axial lead configuration suitable for through-hole installation.

Applications

• Voltage reference circuits requiring precise potential levels
• Overvoltage protection stages in electronic systems
• General-purpose voltage regulation tasks

Procurement Notes

Verify the specific suffix TR8 indicates tape-and-reel packaging when sourcing. Confirm RoHS compliance status as the base part may not meet current environmental standards. Check manufacturer documentation for any military screening prefixes or alternative surface mount equivalents if leaded components are unsuitable for the target assembly process.

Selection Notes

Select this component for designs requiring a 3.9 V reference point with moderate power handling capabilities. Ensure the circuit layout accommodates the axial leads of the DO-41 package. Consider the ±5% tolerance limits during voltage regulation calculations to maintain system stability under varying load conditions.

Part Context

This device belongs to the extensive 1N4728A through 1N4764A series of 1-watt Zener diodes manufactured by Microsemi. The series covers a wide voltage selection from 3.3 V to 100 V. The AP designation identifies it as a plastic encapsulated variant within this established JEDEC registered lineup.

Replacement Considerations

Surface mount equivalents such as the SMAJ4730A or MLL4730A series offer identical electrical characteristics in compact packages. Higher power variants like the SMBG4730A provide equivalent performance with increased wattage ratings for denser board layouts.