1N4745P/TR8

Overview

The Microchip Technology 1N4745P/TR8 is a silicon 1-watt Zener diode with a nominal voltage of 16 V and a standard tolerance of ±10%. It operates within a temperature range of -65°C to +150°C. The device features a plastic DO-41 (DO-204AL) axial-lead package, providing lower thermal resistance compared to glass-body options. Electrical characteristics include a maximum dynamic impedance of 16 ohms at a test current of 15.5 mA, a maximum reverse current of 57 µA, and a steady-state power dissipation of 1.0 watts.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• 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 classification is Level 1 per IPC/JEDEC J-STD-020B with no dry pack required

Applications

• Voltage regulation in electronic circuits
• Reference voltage sources
• Overvoltage protection

Procurement Notes

Verify the specific suffix configuration against official datasheets to confirm material composition and compliance status. Confirm that the TR suffix indicates tape and reel packaging per EIA-296 standards. Ensure compatibility with assembly processes regarding solder temperatures and lead lengths. Cross-reference part numbers with manufacturer documentation to validate screening levels and environmental certifications before procurement.

Selection Notes

Select this component when a 16 V regulation point is required with standard 10% tolerance. Consider the plastic DO-41 package for improved thermal performance over glass alternatives. Verify that the 1-watt power rating and operating temperature range meet system requirements. Evaluate the axial-lead form factor for mechanical mounting constraints and PCB layout needs.

Part Context

This part belongs to the 1N4728AP thru 1N4764AP series of 1.0 watt Zener diodes manufactured by Microsemi Scottsdale Division. The series offers an extensive voltage selection from 3.3 to 100 volts. The 'P' suffix designates plastic construction, while the 'TR' suffix indicates tape and reel packaging. These devices are JEDEC registered and available in various military screening levels with different prefixes.

Replacement Considerations

Consult factory resources for surface mount equivalents such as SMAJ4745A or MLL4745A. Military screening variants may be available with MQ, MX, MV, or MSP prefixes. Verify electrical parameters and package dimensions when substituting with other manufacturers' parts.