1N4746APE3/TR12

Overview

The Microchip Technology 1N4746APE3/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 an 18 V nominal Zener voltage and a standard 5% tolerance. 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 transfer molded epoxy construction.

Feature Summary

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

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection in power supply inputs
• Clamping applications in signal processing paths

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'P' indicates plastic encapsulation, 'e3' confirms RoHS compliance with tin plating, and 'TR12' denotes the specific tape and reel packaging configuration. Confirm the manufacturer origin, as this component originates from the Microsemi Scottsdale Division, now part of Microchip Technology. Ensure the procurement request aligns with the JEDEC registered type number requirements for your design.

Selection Notes

Select this component when a 1.0-watt power dissipation rating at 25°C is required for robust thermal performance. The 18 V nominal voltage with 5% tolerance suits precision regulation needs where tighter tolerances are unnecessary. Consider the plastic DO-41 package for its lower thermal resistance compared to glass-body options. Verify that the operating environment stays within the specified -65°C to +150°C range and that the lead length allows for the rated thermal resistance calculations.

Part Context

This device belongs to the extensive 1N4728A through 1N4764A series, offering voltage selections from 3.3 to 100 volts. The 'P' suffix distinguishes it as a plastic-molded variant, providing lower thermal resistance than the glass-body 'G' suffix counterparts. The 'e3' suffix ensures environmental compliance, while the 'TR' suffix indicates availability in automated tape and reel packaging for high-volume surface or through-hole assembly processes.

Replacement Considerations

Equivalent parts include other 1N4746A variants with matching 18 V ratings and 1 W power dissipation. Plastic package alternatives like 1N4743AP or 1N4747AP share the same series characteristics but differ in voltage. Glass-body versions such as 1N4746G offer similar electrical performance but with higher thermal resistance. Surface mount equivalents like SMAJ4746A provide space-saving options with comparable regulation capabilities.