1N4742CPE3/TR12

Overview

The Microchip Technology 1N4742CPE3/TR12 is a silicon 1.0-watt Zener diode in a plastic DO-41 axial package. It provides voltage regulation at a nominal 12V with a tight 2% tolerance, 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. Packaged in tape and reel format per EIA-296 standards, it offers flexible mounting terminals and void-free epoxy construction.

Feature Summary

• Provides precise voltage regulation with a standard 2% tolerance for stable circuit performance
• Features flexible axial-lead mounting terminals suitable for through-hole applications
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Includes RoHS compliant annealed matte-tin plating for solderability

Applications

• Voltage regulation in broad operating current and temperature ranges
• High density circuit designs requiring low parasitic characteristics
• Applications necessitating moisture classification Level 1 without dry pack requirements

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'P' indicates plastic encapsulation, 'e3' confirms RoHS compliance, and 'TR' denotes tape and reel packaging. Confirm the 'C' suffix aligns with the necessary 2% voltage tolerance. Ensure the component meets specific military screening requirements if applicable, as these require distinct prefix identifiers not included in this base part number.

Selection Notes

Select this component when a 12V Zener diode with tighter than standard 5% tolerance is required. The plastic construction offers lower thermal resistance compared to glass-body options. Consider the 1W power dissipation rating and the -65°C to +150°C operating range for environmental suitability. Verify compatibility with existing PCB layouts designed for the DO-41 footprint.

Part Context

This device belongs to the 1N4728AP thru 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 1N4742 variant specifically targets the 12V regulation segment within this extensive lineup of JEDEC registered components.

Replacement Considerations

Equivalent surface mount options are available as SMAJ4742A or MLL4742A. Glass-body equivalents exist under the G suffix designation. Direct replacements must maintain the 12V nominal voltage, 1W power rating, and compatible DO-41 or equivalent package dimensions.