1N4738PE3/TR12

Overview

The Microchip Technology 1N4738PE3/TR12 is a silicon 1.0-watt Zener diode in a plastic DO-41 axial package. It provides voltage regulation at a nominal Zener voltage of 8.2 V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C and features a maximum reverse current of 10 µA at a test voltage of 6 V. Electrical characteristics include a dynamic impedance of 4.5 Ohms at a test current of 31 mA, a knee impedance of 500 Ohms at 0.5 mA, and a forward voltage of 1.2 V maximum 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
• Moisture classification is Level 1 per IPC/JEDEC J-STD-020B requiring no dry pack

Applications

• Voltage regulation circuits
• Reference voltage sources
• Overvoltage protection

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm packaging configuration and compliance status. Ensure the component matches the required JEDEC registration and screening levels for your application. Confirm that the plastic encapsulation and lead plating meet environmental regulations relevant to your region before finalizing procurement.

Selection Notes

Select this component when a 1.0-watt power dissipation rating and an 8.2 V nominal Zener voltage are required. Consider the plastic DO-41 package for its lower thermal resistance compared to glass-body options. Verify that the ±5% voltage tolerance aligns with circuit requirements and that the operating temperature range covers the intended environment.

Part Context

This part belongs to the 1N4728AP thru 1N4764AP series of silicon 1-watt Zener diodes manufactured by Microsemi (now Microchip Technology). The series offers extensive voltage selection from 3.3 to 100 volts. The 'e3' suffix indicates RoHS compliance, while the 'TR' suffix denotes tape and reel packaging. These devices are JEDEC registered and designed for general-purpose voltage regulation.

Replacement Considerations

Consult the manufacturer's datasheet for surface mount equivalents such as SMAJ or MLL series diodes. Verify compatibility with existing circuit parameters if substituting with other manufacturers' 1N4738 variants.