1N4740PE3/TR8

Overview

The Microchip Technology 1N4740PE3/TR8 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 (DO-204AL) axial-lead package. It provides voltage regulation with a nominal Zener voltage of 10 V and a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C and features RoHS compliance indicated by the e3 suffix. Electrical characteristics include a maximum dynamic impedance of 7 Ohms at a test current of 25 mA, a maximum reverse current of 10 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 standard installation
• 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 10 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 configuration as specified in the manufacturer's documentation. Confirm that the e3 suffix indicates RoHS compliant annealed matte-Tin plating solderable per MIL-STD-750 method 2026. Ensure compatibility with the required JEDEC registered part number specifications for the 1N4740A series before procurement.

Selection Notes

Select this component when a 10 V Zener voltage with ±5% tolerance is required for power dissipation up to 1.0 watt. Consider the plastic DO-41 package for lower thermal resistance compared to glass-body options. Verify that the operating environment falls within the -65°C to +150°C range and that the moisture classification Level 1 meets storage requirements without dry pack necessity.

Part Context

This device belongs to the popular 1N4728AP through 1N4764AP series of 1.0-watt Zener diodes manufactured by Microsemi (now Microchip Technology). The series offers an extensive voltage selection from 3.3 to 100 volts. The specific part utilizes a plastic encapsulation which provides improved thermal performance over glass variants while maintaining JEDEC registration for interchangeability.

Replacement Considerations

Compatible substitutes include other manufacturers' 1N4740A or 1N4740AP equivalents in the DO-41 package. Surface mount replacements such as SMAJ4740A are available but require layout adaptation. Ensure any replacement maintains the 10 V nominal voltage and 1.0 W power rating.