1N4742AGE3

Overview

The Microchip Technology 1N4742AGE3 is a single silicon Zener diode housed in the DO-41 axial leaded package. It provides a nominal Zener voltage of 12 V with a tolerance of ±5%. The device supports a power dissipation of 1 W and operates within a temperature range of -65°C to +175°C. Key electrical characteristics include a maximum reverse leakage current of 1 µA, a Zener impedance of 9 Ohms, and a test current of 21 mA. It features a forward voltage of 1.2 V at 200 mA and complies with RoHS standards.

Feature Summary

• Provides stable voltage regulation via Zener breakdown mechanism
• Capable of handling high thermal loads up to 175°C junction temperature
• Constructed with glass passivation for environmental durability

Applications

• Voltage reference circuits requiring precise potential levels
• Overvoltage protection stages in power supply inputs
• Clamping applications for transient voltage suppression

Procurement Notes

Verify the specific suffix 'E3' confirms lead-free compliance and RoHS status against the manufacturer's latest datasheet. Confirm the DO-41 package dimensions match your PCB footprint requirements. Ensure the 1W power rating aligns with your thermal management design under expected operating conditions.

Selection Notes

Select this component when a 12V regulation point is required in an axial through-hole layout. Consider the 9 Ohm impedance for dynamic load variations. Evaluate the 1W dissipation capability against ambient temperature derating curves to ensure reliable operation without excessive heat buildup.

Part Context

This part belongs to the standard 1N47xx series of 1-watt Zener diodes manufactured by Microchip Technology. The 'E3' suffix indicates a lead-free finish compliant with international environmental directives. It serves as a direct replacement for older non-compliant versions within the same voltage and power class.

Replacement Considerations

Equivalent parts include the 1N4742A from other manufacturers offering identical 12V/1W specifications in the DO-41 package. Verify that substitute components meet the same -65°C to +175°C operating temperature range and 5% voltage tolerance requirements.