1N4749CP/TR12

Overview

The Microchip Technology 1N4749CP/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 with a TR suffix indicating tape and reel packaging. It provides voltage regulation at a nominal Zener voltage of 24 V with a tight tolerance of ±2%, as indicated by the 'C' suffix. The device operates within a temperature range of -65°C to +150°C and features a maximum dynamic impedance of 25 Ohms at a test current of 10.5 mA.

Feature Summary

• Provides precise voltage regulation with a standard ±2% tolerance on nominal Zener voltage
• Features flexible axial-lead mounting terminals for through-hole applications
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Moisture classified as Level 1 per IPC/JEDEC J-STD-020B requiring no dry pack

Applications

• Voltage regulation circuits requiring stable reference voltages
• Low voltage stabilizers in electronic systems
• Protection against overvoltage conditions in power supplies

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'P' indicates plastic construction, 'C' denotes a 2% voltage tolerance, and 'TR' specifies tape and reel packaging. Confirm RoHS compliance status if applicable, as devices with an 'e3' suffix are RoHS compliant. Ensure the manufacturer source aligns with procurement requirements, noting historical transitions between Microsemi and Microchip Technology for this component family.

Selection Notes

Select this component when a 24 V reference with high precision is required. The ±2% tolerance makes it suitable for applications demanding tighter voltage control than standard 5% or 10% variants. Consider the plastic package's lower thermal resistance compared to glass-body options and verify that the 1.0 W power dissipation rating meets the circuit's thermal management needs under steady-state conditions.

Part Context

This part belongs to the JEDEC registered 1N4728A through 1N4764A series of 1.0 watt Zener diodes. The series offers an extensive voltage selection from 3.3 to 100 volts. The specific 'C' suffix identifies the tighter 2% tolerance variant, while the 'P' suffix designates the plastic encapsulated version which provides lower thermal resistance compared to the glass-body option.

Replacement Considerations

Equivalent parts include other 24 V Zener diodes with ±2% tolerance in the DO-41 package. Cross-reference with the broader 1N4749A series for 5% tolerance variants if precision requirements allow. Surface mount equivalents such as SMAJ4749A or MLL4749A may be considered for space-constrained designs.