1N4748PE3/TR12

Overview

The Microchip Technology 1N4748PE3/TR12 is a silicon Zener diode with a nominal voltage of 22 V and a 5% tolerance. It features a 1 W power dissipation rating at 25°C, operating within a temperature range of -65°C to +150°C. The device utilizes a DO-41 axial lead package and is supplied in tape and reel format. Electrical characteristics include a maximum reverse leakage current of 5 µA at the test voltage, a dynamic impedance of 23 Ohms at the test current of 11.5 mA, 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 through-hole applications
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 flammability classification

Applications

• Voltage regulation circuits requiring precise 22 V reference levels
• Power supply protection and clamping applications
• General-purpose electronic equipment utilizing axial-lead components

Procurement Notes

Verify the specific manufacturer origin, as the 1N4748PE3 designation may be sourced from Microsemi or Microchip Technology depending on production history. Confirm RoHS compliance status and tape and reel packaging specifications directly with the supplier. Ensure the ordering suffix matches the required moisture sensitivity level and screening standards for your assembly process.

Selection Notes

Select this component when a 22 V Zener voltage with tight 5% tolerance is required for precision regulation. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Consider the 1 W power dissipation limit and derating curves for high-temperature environments. Verify compatibility with existing axial-lead footprints and automated placement equipment requirements for tape and reel formats.

Part Context

This part belongs to the 1N4728AP thru 1N4764AP series of 1.0 watt Zener diodes. The series provides voltage regulation from 3.3 to 100 volts with various tolerance options. The 'P' suffix indicates plastic encapsulation, while the 'e3' suffix denotes RoHS compliance. These devices are JEDEC registered and designed for general-purpose voltage regulation tasks in industrial and commercial electronics.

Replacement Considerations

Direct substitutes include other 1N4748 variants such as 1N4748A (glass body) or 1N4748AP (plastic body). Cross-reference with equivalent parts from other manufacturers offering 22 V, 1 W Zener diodes in the DO-41 package. Ensure replacement parts match the 5% voltage tolerance and electrical characteristics specified in the original datasheet.