1N4733APE3/TR12

Overview

The Microchip Technology 1N4733APE3/TR12 is a silicon planar Zener diode in the 1N4728AP through 1N4764AP series, providing voltage regulation with a nominal Zener voltage of 5.1 V and a standard tolerance of ±5%. It features a plastic DO-41 (DO-204AL) axial lead package with a void-free transfer molded epoxy body. The device dissipates 1.0 W at 25°C and operates within a temperature range of -65°C to +150°C. Electrical characteristics include a maximum dynamic impedance of 7 Ohms at a test current of 49 mA, a maximum reverse current of 10 µA, 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 standard PCB integration
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• RoHS compliant devices available with an e3 suffix indicating annealed matte-Tin plating

Applications

• Voltage regulation circuits requiring 5.1 V reference
• Power supply protection and clamping applications
• General purpose electronic equipment utilizing axial lead components

Procurement Notes

Verify that the ordering suffix matches the required specifications, as the 'P' indicates plastic construction and 'e3' denotes RoHS compliance. Confirm the 'TR12' suffix aligns with the specific tape and reel packaging requirements per EIA-296 standards. Ensure the component meets moisture classification Level 1 requirements without dry pack constraints. Cross-reference the manufacturer's datasheet for any military screening prefixes if higher reliability levels are necessary.

Selection Notes

Select this component when a 5.1 V Zener voltage with 5% tolerance is required in a 1-watt power dissipation class. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Consider the maximum dynamic impedance of 7 Ohms for circuit stability. Verify that the operating temperature range of -65°C to +150°C suits the environmental conditions. Check if surface mount equivalents like SMAJ4733A are preferred for automated assembly.

Part Context

This part belongs to the popular 1N4728AP through 1N4764AP series of 1.0 watt Zener diodes manufactured by Microsemi Scottsdale Division. The series provides a wide selection of voltages from 3.3 to 100 volts. These plastic encapsulated Zeners are JEDEC registered and offer standard 5% tolerances with the 'A' suffix. The series also includes options for tighter tolerances and various military screening levels.

Replacement Considerations

Surface mount equivalents such as SMAJ4733A or MLL4733A are available from the same manufacturer family. Glass-body versions exist but differ in thermal resistance and package material. Verify that substitute parts maintain the 5.1 V nominal voltage and 1 W power rating.