1N4745AP/TR12

Overview

The Microchip Technology 1N4745AP/TR12 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, featuring plastic encapsulation and axial leads. It provides voltage regulation with a nominal Zener voltage of 16 V at a test current of 15.5 mA. The device offers a standard 5% tolerance on nominal Zener voltage, a maximum dynamic impedance of 16 Ohms, and a maximum reverse current of 57 µA. It operates within a temperature range of -65°C to +150°C and utilizes a DO-41 (DO-204AL) package.

Feature Summary

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

Applications

• Voltage regulation circuits requiring 16 V reference
• Power supply protection and clamping applications
• General-purpose electronic equipment utilizing axial-lead components

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm packaging configuration and compliance status. Confirm that the TR12 designation aligns with tape and reel requirements. Ensure compatibility with existing thermal management designs given the 1.0-watt power dissipation rating. Cross-reference manufacturer datasheets for any recent product change notices or screening level updates.

Selection Notes

Select this component when a 16 V regulated output is required with 5% tolerance accuracy. Consider the plastic construction for lower thermal resistance compared to glass-body options. Evaluate the axial lead format against available board space and mounting constraints. Verify that the 1.0-watt power dissipation capability meets the circuit's peak and steady-state load requirements.

Part Context

This part belongs to the JEDEC registered 1N4728A to 1N4764A series of 1.0-watt Zener diodes. The 'P' suffix indicates plastic encapsulation, while the 'TR' suffix denotes tape and reel packaging. The device is manufactured by Microsemi, now part of Microchip Technology, offering extensive voltage selection from 3.3 to 100 volts within this family.

Replacement Considerations

Equivalent parts include other 1N4745 variants with matching 16 V Zener voltage and 1 W power rating. Verify package compatibility and tolerance specifications before substitution.