1N4737PE3/TR12

Overview

The Microchip Technology 1N4737PE3/TR12 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 7.5 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. Packaged in tape and reel format per EIA-296 standards as denoted by the 'TR12' suffix, it offers flexible mounting terminals and void-free transfer molded epoxy construction.

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
• RoHS compliant with annealed matte-Tin plating solderable per MIL-STD-750

Applications

• Voltage regulation circuits requiring 7.5 V reference
• General purpose electronic equipment power supplies
• Temperature compensation networks
• Protection against overvoltage transients

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'P' indicates plastic encapsulation, 'e3' confirms RoHS compliance, and 'TR12' specifies the tape and reel packaging format. Confirm the manufacturer source, as this component originates from the Microsemi Scottsdale Division, now part of Microchip Technology. Ensure the procurement documentation aligns with JEDEC registration standards for the 1N4737A series.

Selection Notes

Select this component when a 7.5 V Zener voltage with ±5% tolerance is required for through-hole assembly. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Consider the maximum power dissipation of 1.0 W at 25°C and apply derating factors for higher ambient temperatures or FR4 PCB mounting conditions. Verify compatibility with existing circuit designs regarding test current and dynamic impedance characteristics.

Part Context

This device belongs to the popular 1N4728AP through 1N4764AP series of 1.0-watt Zener diodes manufactured by Microsemi's Scottsdale Division. The series covers a wide voltage selection from 3.3 to 100 volts. These plastic encapsulated devices are moisture classified as Level 1 and do not require dry packing. The series is JEDEC registered and available in various military screening levels upon request.

Replacement Considerations

Direct replacements include other manufacturers' 1N4737A or 1N4737AP equivalents in the DO-41 package. Surface mount alternatives such as MLL4737A or SMAJ4737A may be considered if layout changes are permissible. Ensure any substitute maintains the 7.5 V nominal voltage, ±5% tolerance, and 1.0 W power rating.