1N4746P/TR12

Overview

The Microchip Technology 1N4746P/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 18 V and a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C and features a maximum dynamic impedance of 20 Ohms at a test current of 14 mA. It includes RoHS-compliant annealed matte-tin plating and is supplied in tape and reel packaging.

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 electronic circuits requiring stable reference voltages
• Power supply protection and clamping applications

Procurement Notes

Verify the specific manufacturer origin, as this part number originates from the Microsemi Scottsdale Division which has undergone corporate restructuring. Confirm that the RoHS compliant status aligns with current project requirements and check for any updated datasheet revisions or alternative part numbers due to potential manufacturing line changes.

Selection Notes

Select this component when a 1-watt power dissipation rating and an 18 V regulation point are required. The plastic construction is suitable for environments where lower thermal resistance is beneficial compared to glass equivalents. Ensure the circuit design accommodates the specified surge current limits and verify that the axial lead form factor fits the available board space.

Part Context

This device belongs to the JEDEC registered 1N4728A through 1N4764A series of 1.0-watt Zener diodes. The 'P' suffix indicates plastic encapsulation, while the 'TR' suffix denotes tape and reel packaging. These components are designed to provide reliable voltage regulation across a wide selection of voltages from 3.3 to 100 volts with standard 5% tolerances.

Replacement Considerations

Surface mount equivalents such as SMAJ4746A or MLL4746A are available from the same manufacturer family. Other manufacturers producing standard 1N4746A specifications may serve as functional substitutes if mechanical and electrical parameters match.