1N4746P/TR8

Overview

The Microchip Technology 1N4746P/TR8 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 ±10%. 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 is supplied in tape and reel packaging.

Feature Summary

• Plastic encapsulated construction 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

Applications

• Voltage regulation over broad operating current and temperature ranges
• General purpose electronic circuit protection
• Reference voltage generation in power supplies

Procurement Notes

Verify the manufacturer origin as the datasheet originates from Microsemi Scottsdale Division, now part of Microchip Technology. Confirm that the TR8 suffix corresponds to the specified tape and reel packaging format. Ensure compliance requirements match the specific ordering designation provided by the supplier.

Selection Notes

Select this component when a 1-watt power dissipation rating and an 18 V regulation point are required. The plastic DO-41 package is suitable for applications needing robust mechanical mounting. Consider the ±10% voltage tolerance and 20 ohm dynamic impedance characteristics against circuit precision requirements.

Part Context

This part belongs to the JEDEC registered 1N4728A to 1N4764A series of silicon Zener diodes. The 'P' suffix designates the plastic molded epoxy body construction, while the 'TR' indicates tape and reel packaging. These devices are designed for general-purpose voltage regulation tasks across industrial and commercial electronics.

Replacement Considerations

Consult factory documentation for surface mount equivalents such as SMAJ4746A or MLL4746A. Verify compatibility with military screening levels if JAN, JANTX, JANTXV, or JANS prefixes are required for specific environmental ruggedness standards.