1N4738AP/TR12

Overview

The Microchip Technology (Microsemi) 1N4738AP/TR12 is a silicon Zener diode in the 1N4728AP through 1N4764AP series, providing voltage regulation with an 8.2V nominal breakdown voltage and a 5% tolerance. It features a plastic DO-41 (DO-204AL) package with axial leads, rated for 1.0W power dissipation at 25°C ambient temperature. The device operates within a temperature range of -65°C to +150°C and includes a TR suffix indicating tape and reel packaging per EIA-296 standards.

Feature Summary

• Plastic molded epoxy body offering lower thermal resistance compared to glass-body options
• Moisture classification Level 1 requiring no dry pack storage
• Flexible axial-lead terminals solderable per MIL-STD-750 method 2026
• ESD nonsensitive performance verified by MIL-STD-750 Method 1020

Applications

• Voltage regulation across broad operating current and temperature ranges
• General purpose circuit protection and reference applications
• Industrial equipment utilizing standard axial-lead mounting

Procurement Notes

Verify that the specific part number matches the required electrical characteristics and physical dimensions. Confirm the presence of the TR suffix indicates tape and reel packaging rather than bulk or other formats. Ensure compatibility with existing assembly processes regarding lead plating and moisture sensitivity levels before procurement.

Selection Notes

Select this component when a 1.0W power rating and 8.2V regulation are required in a plastic axial package. Consider the lower thermal resistance of the plastic construction versus glass alternatives. Verify if military screening prefixes like MV are necessary for specific reliability requirements beyond standard commercial specifications.

Part Context

This component belongs to the widely used 1N4728A through 1N4764A series of 1-watt Zener diodes. The 'P' suffix designates the plastic encapsulated version, while the 'TR' suffix specifies tape and reel packaging. These devices are JEDEC registered and offer extensive voltage selection from 3.3V to 100V with standard 5% tolerances.

Replacement Considerations

Direct replacements include the 1N4738A (glass body) or 1N4738AP (bulk plastic). Surface mount equivalents such as SMAJ4738A or MLL4738A are available but require different mounting considerations. Verify that substitute parts meet the same 1.0W power dissipation and 8.2V tolerance requirements.