1N4746E3/TR13

Overview

The Microchip Technology 1N4746E3/TR13 is a silicon 1-watt Zener diode from the 1N4728AP through 1N4764AP series. It provides voltage regulation with a nominal Zener voltage of 18V and a standard tolerance of ±5%. The device utilizes a plastic encapsulated DO-41 (DO-204AL) axial-lead package, offering lower thermal resistance compared to glass-body options. It operates within a temperature range of -65°C to +150°C and features RoHS compliance indicated by the 'e3' suffix.

Feature Summary

• Plastic molded epoxy body providing lower thermal resistance compared to glass-body variants
• Moisture classification Level 1 per IPC/JEDEC J-STD-020B requiring no dry pack
• Flexible axial-lead mounting terminals for standard through-hole applications
• Regulates voltage over a broad operating current and temperature range

Applications

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

Procurement Notes

Verify that the ordering suffix matches the required specifications. The 'TR' suffix indicates tape and reel packaging per EIA-296 standards. Confirm the 'e3' suffix denotes RoHS compliant annealed matte-Tin plating. Ensure the base part number corresponds to the specific voltage and tolerance requirements for the intended design application.

Selection Notes

Select this component when a 1-watt power dissipation rating is required for voltage regulation tasks. The plastic construction offers distinct thermal advantages over glass alternatives. Verify that the ±5% voltage tolerance meets circuit precision needs. Consider the axial lead configuration for compatibility with existing printed circuit board layouts and assembly processes.

Part Context

This device belongs to the JEDEC registered 1N4728A through 1N4764A series manufactured by Microsemi's Scottsdale Division. The series covers an extensive voltage selection from 3.3 to 100 volts. The 1N4746 variant specifically addresses the 18-volt regulation requirement within this standardized product family.

Replacement Considerations

Surface mount equivalents are available as SMAJ4746A or MLL4746A. Glass-body versions exist under the G suffix designation. Military screening levels can be obtained by adding MQ, MX, MV, or MSP prefixes respectively.