1N4745APE3/TR12

Overview

The Microchip Technology 1N4745APE3/TR12 is a silicon 1.0-watt Zener diode in a plastic DO-41 axial package. It provides voltage regulation at a nominal 16 V with a 5% tolerance. The device operates within a temperature range of -65°C to +150°C and features RoHS-compliant annealed matte-tin plating. 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 at 12.2 V, and a forward voltage of 1.2 V maximum at 200 mA.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard through-hole applications
• Constructed with void-free transfer molded thermosetting epoxy meeting UL94V-0 standards
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage regulation in power supply circuits
• Reference voltage generation in electronic systems
• Overvoltage protection for sensitive components

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm packaging configuration. The TR12 designation indicates tape and reel packaging; ensure compatibility with automated assembly equipment. Confirm RoHS compliance status and terminal plating specifications match project requirements before procurement.

Selection Notes

Select this component for applications requiring 16 V regulation with 5% tolerance in a 1 W power dissipation package. Ensure the operating environment stays within the specified -65°C to +150°C range. Consider thermal resistance derating curves if ambient temperatures exceed 45°C or lead temperatures exceed 105°C during operation.

Part Context

This part belongs to the 1N47xxA series of 1-watt Zener diodes manufactured by Microsemi (now Microchip Technology). The 'P' suffix denotes plastic encapsulation, offering lower thermal resistance compared to glass-body options. The 'e3' suffix indicates RoHS compliance with tin-lead or matte-tin terminals. These devices are JEDEC registered and widely used in general-purpose voltage regulation.

Replacement Considerations

Compatible substitutes include other 1N4745A variants from different manufacturers, provided they meet the 16 V nominal voltage, 5% tolerance, 1 W power rating, and DO-41 package dimensions. Verify electrical parameters such as dynamic impedance and reverse leakage current against original specifications.