1N4742PE3/TR8

Overview

The Microchip Technology 1N4742PE3/TR8 is a silicon 1.0-watt Zener diode in the 1N4728AP-1N4764AP series, housed in a DO-41 axial plastic package. It provides voltage regulation with a nominal Zener voltage of 12 V and a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C. Key electrical parameters include a maximum dynamic impedance of 9 Ohms at a test current of 21 mA, a maximum reverse leakage current of 5 µA, and a forward voltage of 1.2 V at 200 mA.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for through-hole applications
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage regulation circuits requiring 12 V reference
• Power supply protection and clamping applications
• General-purpose electronic equipment utilizing axial lead components

Procurement Notes

Verify that the ordering suffix TR8 corresponds to the tape and reel packaging format specified in the datasheet. Confirm RoHS compliance status by checking the e3 suffix designation on the component marking or official documentation. Ensure the supplier provides valid traceability data for the JEDEC registered part number to guarantee authenticity and adherence to manufacturing standards.

Selection Notes

Select this component when a 12 V Zener voltage with 5% tolerance is required in an axial package. The plastic construction offers lower thermal resistance compared to glass-body options. Consider the 1 W power dissipation rating and derating curves for high-temperature environments. Verify compatibility with existing PCB layouts designed for DO-41 footprints.

Part Context

This part belongs to the widely used 1N4728A through 1N4764A series of 1.0 watt Zener diodes. The series covers a voltage selection from 3.3 to 100 volts. The 'P' suffix indicates plastic encapsulation, while 'e3' denotes RoHS compliant tin plating. These devices are JEDEC registered and serve as standard replacements for legacy glass-body variants in modern electronics design.

Replacement Considerations

Direct substitutes include other manufacturers' 1N4742A parts in DO-41 packages. For surface mount requirements, consider SMAJ4742A equivalents. Verify that replacement parts maintain the same 12 V nominal voltage, 5% tolerance, and 1 W power rating to ensure circuit functionality remains unchanged.