1N4738CPE3/TR8

Overview

The Microchip Technology 1N4738CPE3/TR8 is a silicon 1.0-watt Zener diode in a plastic DO-41 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 compliance via the 'e3' suffix, utilizing annealed matte-tin plating. Packaged in tape and reel format per EIA-296 standards, it offers flexible mounting terminals and low thermal resistance compared to glass-body options.

Feature Summary

• Provides precise voltage regulation with ±2% tolerance for stable reference applications
• Features moisture classification Level 1 requiring no dry pack handling
• Offers lower thermal resistance than glass-body equivalents for efficient heat dissipation
• Includes RoHS compliant construction with annealed matte-tin solderable terminals

Applications

• Voltage regulation circuits requiring tight tolerance stability
• Reference voltage sources in precision electronic systems
• Overvoltage protection components in industrial equipment

Procurement Notes

Verify that the ordering suffix 'CPE3/TR8' correctly corresponds to the specific 8.2V variant with 2% tolerance, RoHS compliance, and tape-and-reel packaging. Confirm manufacturer documentation matches the JEDEC registered part number requirements. Ensure compatibility with existing assembly processes regarding the plastic encapsulation and terminal plating specifications.

Selection Notes

Select this component when a 1-watt power rating and ±2% voltage accuracy are required for axial lead implementations. The plastic DO-41 package is suitable for general-purpose through-hole mounting where lower thermal resistance is preferred over hermetic sealing. Consider the operating temperature range and surge current capabilities relative to the specific circuit load conditions.

Part Context

This device belongs to the 1N4728AP thru 1N4764AP series of silicon Zener diodes manufactured by Microsemi (now Microchip Technology). The series covers a voltage selection from 3.3 to 100 volts. The 'P' suffix denotes plastic encapsulation, while the 'C' suffix specifies the tighter 2% voltage tolerance standard for this particular part number within the broader family.

Replacement Considerations

Equivalent parts include other 8.2V Zener diodes with ±2% tolerance and 1W power rating in DO-41 packages. Verify electrical characteristics such as dynamic impedance and reverse leakage current match the original design requirements before substitution.