1N4737CPE3/TR8

Overview

The Microchip Technology 1N4737CPE3/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 7.5 V and a tight tolerance of +/- 2%, indicated by the 'C' suffix. The device operates within a temperature range of -65°C to +150°C and features RoHS compliance via the 'e3' suffix. Packaged in tape and reel format per EIA-296 standards as denoted by the 'TR8' suffix, it offers flexible mounting terminals and void-free transfer molded epoxy construction.

Feature Summary

• Provides precise voltage regulation with a tight +/- 2% tolerance on nominal Zener voltage
• Features flexible axial-lead mounting terminals for standard through-hole integration
• 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 over broad operating current and temperature ranges
• General purpose voltage reference circuits
• Over-voltage protection applications

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'P' indicates plastic construction, 'e3' confirms RoHS compliance, and 'TR8' specifies the tape and reel packaging format. Confirm the 'C' suffix corresponds to the necessary 2% voltage tolerance. Ensure the component meets the specific JEDEC registration requirements for the 1N4737A series before procurement.

Selection Notes

Select this component when a 7.5 V regulation point with high precision is required in an axial-lead form factor. The plastic encapsulation offers lower thermal resistance compared to glass-body options. Consider the 1.0 W power dissipation capability and the wide operating temperature range suitable for demanding environments. Verify compatibility with existing PCB layouts designed for DO-41 packages.

Part Context

This part belongs to the extensive 1N4728AP through 1N4764AP series of 1.0 Watt Zener Diodes manufactured by Microsemi (now Microchip Technology). The series covers a voltage selection from 3.3 to 100 volts. The 1N4737 variant specifically targets the 7.5 V regulation segment, offering tighter tolerances than the standard A-suffix versions.

Replacement Considerations

Surface mount equivalents such as SMAJ4737A or MLL4737A are available from the same manufacturer family. Direct replacements must maintain the 7.5 V nominal voltage, 1.0 W power rating, and compatible package dimensions if physical interchangeability is required.