1N4742PE3/TR12

Overview

The Microchip Technology 1N4742PE3/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 12 V and a standard tolerance of ±5%. 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 moisture classification Level 1.

Feature Summary

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

Applications

• Voltage regulation circuits requiring 12 V reference
• Power supply protection and clamping applications
• General-purpose electronic equipment utilizing axial-lead components

Procurement Notes

Verify that the specific part number matches the required electrical characteristics, including the 12 V Zener voltage and ±5% tolerance. Confirm the presence of the TR12 suffix indicates tape and reel packaging rather than bulk. Ensure the e3 suffix confirms RoHS compliance and matte-tin terminations. Cross-reference the manufacturer datasheet for thermal derating curves and maximum ratings before finalizing procurement specifications.

Selection Notes

Select this component when a 1 W power dissipation rating and axial-lead form factor are required. The 12 V nominal voltage with 5% tolerance suits standard regulation needs. Consider the plastic encapsulation for lower thermal resistance compared to glass-body options. Verify compatibility with assembly processes regarding the tape and reel packaging and soldering temperatures specified in the mechanical data.

Part Context

This device belongs to the popular 1N4728A through 1N4764A series of 1.0 watt Zener diodes manufactured by Microsemi's Scottsdale Division. The series covers a wide voltage selection from 3.3 to 100 volts. The 'P' suffix designates the plastic construction option, while the 'e3' suffix indicates RoHS compliance. These devices are JEDEC registered and offer a cost-effective solution for general voltage regulation tasks.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4742A or 1N4742AP variants. Surface mount equivalents such as MLL4742A are available but require different footprint considerations. Ensure replacement parts match the 1 W power rating, DO-41 package dimensions, and 12 V Zener voltage specifications.