1N4745CPE3/TR8

Overview

The Microchip Technology 1N4745CPE3/TR8 is a silicon Zener diode with a nominal voltage of 16 V and a tolerance of ±2%. It operates in the DO-41 axial lead package, dissipating up to 1.0 W at 25°C. The device features a maximum reverse current of 5 µA at 12.2 V and a dynamic impedance of 16 Ω at a test current of 15.5 mA. It withstands surge currents up to 285 mA and functions within a temperature range of -65°C to +150°C.

Feature Summary

• Provides precise voltage regulation with tight ±2% tolerance for sensitive circuitry
• Utilizes plastic encapsulation offering lower thermal resistance compared to glass-body options
• Features flexible axial-lead terminals suitable for through-hole mounting applications

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection stages in power supplies
• Clamping applications in signal conditioning paths

Procurement Notes

Verify that the specific part number includes the C suffix for 2% tolerance and the TR8 suffix for tape and reel packaging. Confirm RoHS compliance status via the manufacturer's documentation. Ensure the ordering quantity aligns with the standard reel size requirements specified by the supplier. Cross-reference the datasheet revision date to confirm electrical characteristics match your design specifications.

Selection Notes

Select this component when a 16 V regulation point with high precision is required. The plastic construction provides better thermal performance than glass equivalents. Verify that the operating current remains within the specified limits to maintain the ±2% voltage accuracy. Consider the thermal derating curve if ambient temperatures exceed standard conditions.

Part Context

This device belongs to the 1N47xx series of 1-watt Zener diodes manufactured by Microsemi (now Microchip Technology). The series covers a wide voltage range from 3.3 V to 100 V. The 'C' suffix denotes a tighter 2% voltage tolerance, while the 'P' indicates a plastic DO-41 package. The 'e3' suffix confirms RoHS compliance with matte tin plating.

Replacement Considerations

Equivalent parts include the 1N4745A for 5% tolerance or the MV1N4745CP for military screening levels. Check compatibility with SMAJ4745A for surface mount transitions. Verify that substitute components meet the same 16 V nominal voltage and 1 W power dissipation ratings.