1N4744P/TR12

Overview

The Microchip Technology 1N4744P/TR12 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 axial lead package. It provides voltage regulation with a nominal Zener voltage of 15 V and a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C and features a maximum reverse current of 5 µA at the test voltage. Electrical characteristics include a dynamic impedance of 14 Ω at a test current of 17 mA and a maximum forward voltage of 1.2 V at 200 mA.

Feature Summary

• Plastic molded epoxy body offering lower thermal resistance compared to glass-body options
• Moisture classification Level 1 requiring no dry pack storage
• Flexible axial-lead mounting terminals for standard installation
• ESD nonsensitive per MIL-STD-750 Method 1020

Applications

• Voltage regulation over broad operating current and temperature ranges
• General purpose clipping and clamping circuits
• Reference voltage sources in electronic systems

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm packaging configuration. The TR suffix indicates tape and reel packaging per EIA-296 standards. Confirm RoHS compliance status if required, as it depends on the presence of an e3 suffix. Ensure the component meets the required JEDEC registration and screening levels for the intended application environment.

Selection Notes

Select this component when a 15 V regulated reference is needed with a 1 W power dissipation capability. The plastic construction provides better thermal performance than glass equivalents. Consider the ±5% voltage tolerance suitable for general applications. Verify that the axial lead format fits the PCB layout constraints and that the operating temperature range covers the system requirements.

Part Context

This part belongs to the widely used 1N4744 series of 1-watt Zener diodes manufactured by Microsemi (now Microchip Technology). The series covers voltages from 3.3 V to 100 V. The 'P' suffix denotes the plastic DO-41 package, while 'TR' specifies tape and reel packaging. These devices are JEDEC registered and offer extensive voltage selection with various tolerance options identified by different suffix letters.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4744A or 1N4744AP variants in the DO-41 package. Surface mount equivalents such as SMAJ4744A or MLL4744A are available but require footprint adaptation. Verify that replacement components match the 15 V nominal voltage, 1 W power rating, and ±5% tolerance specifications.