1N4749PE3/TR12

Overview

The Microchip Technology 1N4749PE3/TR12 is a silicon 1-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 (DO-204AL) package. It provides voltage regulation with a nominal Zener voltage of 24 volts and a standard tolerance of plus or minus 5%. The device operates within a temperature range of -65°C to +150°C and features a maximum power dissipation of 1.0 watt at 25°C lead temperature. Electrical characteristics include a test current of 10.5 mA, a maximum dynamic impedance of 25 ohms at the test current, and a maximum reverse current of 5 µA at a test voltage of 5 volts.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard PCB integration
• 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 regulation in power supply circuits
• Overvoltage protection for sensitive electronic components
• Reference voltage generation in analog signal processing

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'P' indicates plastic construction, 'e3' confirms RoHS compliance, and 'TR12' denotes tape and reel packaging per EIA-296 standards. Ensure the component source aligns with Microsemi Scottsdale Division documentation. Confirm that the specific batch meets the moisture classification Level 1 requirement without dry pack necessity. Cross-reference the part number against the official datasheet to validate electrical tolerances and thermal ratings before procurement.

Selection Notes

Select this component when a 24-volt regulation point is required with a 5% tolerance in a through-hole plastic package. The DO-41 form factor offers lower thermal resistance compared to glass-body options. Consider the 1-watt power rating and the specific dynamic impedance values for precision requirements. Evaluate the surface mount equivalents SMAJ4749A or MLL4749A if space constraints necessitate alternative mounting styles.

Part Context

This device belongs to the widely used 1N47xx series of 1-watt Zener diodes manufactured by Microsemi's Scottsdale Division. The series covers a voltage range from 3.3 to 100 volts, offering extensive selection for various regulation needs. The 'e3' suffix signifies RoHS compliance, while the 'P' suffix distinguishes the plastic encapsulated version from glass-bodied variants. These components are JEDEC registered and available in various military screening levels upon request.

Replacement Considerations

Surface mount equivalents such as SMAJ4749A and MLL4749A are available from the same manufacturer family. Verify pin compatibility and thermal performance when substituting axial leads with surface mount packages. Ensure the replacement maintains the 24-volt nominal rating and 5% tolerance specification.