1N4749CPE3/TR12

Overview

The Microchip Technology 1N4749CPE3/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 24 V and a tight tolerance of ±2%, indicated by the 'C' suffix. The device operates within a temperature range of -65°C to +150°C and features RoHS-compliant annealed matte-tin plating, designated by the 'e3' suffix. Packaged in tape and reel format per EIA-296 standards, it offers low thermal resistance compared to glass-body options.

Feature Summary

• Provides precise voltage regulation with a standard ±2% tolerance on nominal Zener voltage
• Features flexible axial-lead mounting terminals for through-hole integration
• Constructed with 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 over broad operating current and temperature ranges
• Reference voltage sources in electronic circuits
• Protection against voltage transients in power supplies

Procurement Notes

Verify that the ordering suffixes correctly identify the component specifications. The 'C' suffix confirms the 2% voltage tolerance, while 'P' indicates the plastic DO-41 package construction. Ensure the 'e3' suffix matches requirements for RoHS compliance and tin-plated terminals. Confirm the 'TR' suffix aligns with the necessary tape and reel packaging format for automated assembly processes.

Selection Notes

Select this component when a stable 24 V reference with high precision is required in an axial-lead form factor. The plastic encapsulation offers lower thermal resistance than glass equivalents. Consider the ±2% tolerance for applications demanding tighter voltage accuracy than standard 5% or 10% variants. Verify that the 1 W power dissipation rating and lead-mounted thermal characteristics suit the specific circuit's heat management needs.

Part Context

This part belongs to the widely used 1N4728A through 1N4764A series of 1.0-watt Zener diodes registered with JEDEC. The series covers a voltage selection from 3.3 to 100 volts. Microsemi, now part of Microchip Technology, manufactures these devices in Scottsdale, Arizona. The plastic variant provides a robust alternative to glass-body diodes for general-purpose regulation tasks.

Replacement Considerations

Surface mount equivalents are available as SMAJ4749A and MLL4749A. Other tolerance levels within the same series include 1N4749A (10%) and 1N4749AP (5%). Military screening prefixes such as MX or MV are available for specialized requirements.