1N4748AP/TR12

Overview

The Microchip Technology 1N4748AP/TR12 is a silicon planar Zener diode in the 1N4728A through 1N4764A series, rated for 1.0 watt power dissipation at 25°C. It provides voltage regulation with a nominal Zener voltage of 22V and a standard tolerance of ±5%. The device utilizes a plastic DO-41 (DO-204AL) axial-lead package and operates within a temperature range of -65°C to +150°C. The TR12 suffix indicates tape and reel packaging compliant with EIA-296 standards.

Feature Summary

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

Applications

• Voltage regulation in electronic circuits
• Surge protection applications
• Reference voltage sources

Procurement Notes

Verify that the component matches the specific JEDEC registered part number 1N4748A with the 'P' suffix indicating plastic construction and 'TR' indicating tape and reel packaging. Confirm the manufacturer origin as Microsemi/Microchip Scottsdale Division. Ensure the ordering information aligns with the official datasheet specifications for the 1N4728AP through 1N4764AP series to guarantee correct electrical characteristics and physical dimensions.

Selection Notes

Select this component when a 22V Zener voltage with 5% tolerance is required for 1-watt power dissipation applications. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Consider the tape and reel format for automated assembly processes. Verify that the operating environment falls within the specified -65°C to +150°C temperature range and that the moisture classification level 1 meets storage requirements without dry pack necessity.

Part Context

This component 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 'AP' designation specifically identifies the plastic encapsulated version, which provides distinct thermal advantages over the glass-body 'AG' counterparts. These devices are widely used for general-purpose voltage regulation tasks.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4748A diodes in the DO-41 package. For surface mount replacements, consider SMAJ4748A or MLL4748A equivalents. Glass-body versions like 1N4748G offer similar electrical performance but differ in thermal resistance and hermetic sealing properties.