1N4745PE3/TR12

Overview

The Microchip Technology 1N4745PE3/TR12 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 (DO-204AL) axial-lead package. It provides voltage regulation with a nominal Zener voltage of 16 V and a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C. Key electrical parameters include a maximum dynamic impedance of 16 Ohms at a test current of 15.5 mA, a maximum reverse leakage current of 57 µA at 12.2 V, and a maximum forward voltage of 1.2 V at 200 mA. The component is RoHS compliant and supplied in tape and reel packaging.

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
• 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 that the ordering suffix matches the required specifications. The 'P' suffix indicates plastic construction, while 'e3' confirms RoHS compliance. The 'TR12' suffix denotes tape and reel packaging. Confirm the manufacturer source, as this part number originates from the Microsemi Scottsdale Division, now part of Microchip Technology. Ensure the specific batch data aligns with project requirements before procurement.

Selection Notes

Select this component when a 16 V Zener voltage with ±5% tolerance is required for power dissipation up to 1.0 watt. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Consider the 16 Ohm dynamic impedance and 57 µA reverse leakage current limits for circuit design. This device is suitable for applications needing robustness against ESD and moisture classification Level 1 without dry pack requirements.

Part Context

This device belongs to the JEDEC registered 1N4728A through 1N4764A series of 1.0-watt Zener diodes. The series covers a voltage selection from 3.3 to 100 volts. The 1N4745 variant specifically targets the 16 V regulation point. The plastic encapsulation distinguishes it from glass-body counterparts, providing mechanical durability and standardized axial leads for automated or manual insertion.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4745A devices in the DO-41 package. Surface mount equivalents such as SMAJ4745A are available for space-constrained designs. Verify that replacement components meet the same 1.0 W power dissipation and 16 V Zener voltage specifications.