1N4743APE3/TR12

Overview

The Microchip Technology 1N4743APE3/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 13 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 on its terminals.

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 standards
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection for sensitive electronic components
• General-purpose voltage regulation in power supply designs

Procurement Notes

Verify that the ordering suffix matches the required specifications, as the 'e3' suffix indicates RoHS compliance and the 'TR12' suffix denotes tape and reel packaging. Confirm the manufacturer origin, as this part number originates from the Microsemi Scottsdale Division, now part of Microchip Technology. Ensure the component meets the specific JEDEC registration requirements for the 1N4743A type before procurement.

Selection Notes

Select this component when a 13 V Zener voltage with ±5% tolerance is required in a 1-watt plastic axial package. Consider the thermal resistance of 45 °C/W junction-to-lead for heat dissipation calculations. Verify that the operating environment stays within the specified -65°C to +150°C range and that the lead length allows for proper thermal management during soldering.

Part Context

This device belongs to the popular 1N4728AP through 1N4764AP series of 1.0-watt Zener diodes. These parts are JEDEC registered and offer an extensive voltage selection from 3.3 to 100 volts. The plastic encapsulated version provides lower thermal resistance compared to glass-body options while maintaining moisture classification Level 1 without requiring dry pack storage.

Replacement Considerations

Compatible substitutes include other 1N4743A variants with matching electrical characteristics and package types. Ensure any replacement maintains the 13 V nominal voltage, ±5% tolerance, and 1.0 W power dissipation rating. Verify that the substitute also utilizes the DO-41 or DO-204AL plastic package for mechanical compatibility.