1N4737CPE3/TR12

Overview

The Microchip Technology 1N4737CPE3/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 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-compliant annealed matte-tin plating ('e3' suffix). Packaged in tape and reel format ('TR12' suffix), it offers lower thermal resistance compared to glass-body options.

Feature Summary

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

Applications

• Voltage reference circuits requiring precise regulation
• Power supply protection and overvoltage clamping
• General-purpose voltage regulation in electronic equipment

Procurement Notes

Verify that the ordering suffixes align with specific requirements: 'P' denotes plastic construction, 'e3' indicates RoHS compliance with tin plating, and 'TR' specifies tape and reel packaging. Confirm that the 'C' suffix corresponds to the required 2% voltage tolerance. Ensure compatibility with the DO-41 package dimensions and lead spacing for the target PCB layout.

Selection Notes

Select this component when a 7.5 V regulation point with high precision is needed in a 1-watt power dissipation class. The plastic encapsulation offers lower thermal resistance than glass equivalents. Consider the maximum reverse current and dynamic impedance specifications for circuit stability. Verify that the operating environment stays within the specified -65°C to +150°C range for reliable performance.

Part Context

This part belongs to the JEDEC registered 1N4728A through 1N4764A series of silicon Zener diodes. The series covers a voltage selection from 3.3 V to 100 V. The '1N4737' designation specifically identifies the 7.5 V variant within this extensive lineup, which is widely used in industrial and commercial electronics for basic voltage control tasks.

Replacement Considerations

Compatible substitutes include other 1N4737 variants with matching voltage and power ratings, such as 1N4737A or 1N4737G, provided tolerance and package differences are acceptable. Surface mount equivalents like SMAJ4737A or MLL4737A may be considered if footprint conversion is feasible.