1N4738CP/TR12

Overview

The Microchip Technology 1N4738CP/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 8.2 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 terminals marked with an 'e3' suffix. Packaged in tape and reel format per EIA-296 standards as denoted by the 'TR12' suffix, it offers flexible mounting and moisture classification Level 1.

Feature Summary

• Provides precise voltage regulation with a ±2% tolerance on the nominal Zener voltage.
• Features a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards.
• Offers flexible axial-lead mounting terminals compatible with standard PCB layouts.
• Includes RoHS-compliant annealed matte-tin plating for solderability.

Applications

• Voltage regulation over broad operating current and temperature ranges
• Reference voltage sources in electronic circuits
• Protection against voltage transients

Procurement Notes

Verify that the ordering suffixes align with specific requirements: 'P' indicates plastic construction, 'e3' confirms RoHS compliance, and 'TR' denotes tape and reel packaging. Confirm the 'C' suffix matches the required ±2% voltage tolerance. Ensure the component meets the specified JEDEC registration standards for the 1N4738A type number before procurement.

Selection Notes

Select this component when a 1.0-watt power dissipation rating at 25°C is required alongside high voltage accuracy. The plastic encapsulation provides lower thermal resistance compared to glass-body options. Consider the axial-lead form factor for through-hole applications where surface mount equivalents are not suitable. Verify derating curves if operating temperatures exceed ambient conditions significantly.

Part Context

This part belongs to the popular 1N4728AP through 1N4764AP 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 1N4738 variant specifically targets the 8.2-volt regulation point within this extensive lineup, offering a robust solution for general-purpose voltage regulation tasks.

Replacement Considerations

Surface mount equivalents such as SMAJ4738A or MLL4738A are available from the same manufacturer family. For direct replacement, ensure the substitute maintains the 1.0-watt power rating and ±2% tolerance. Verify that the leaded package dimensions match the existing PCB footprint if transitioning between package types.