1N4739APE3/TR8

Overview

The Microchip Technology 1N4739APE3/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 9.1 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 5.0 Ohms at a test current of 28 mA. It includes RoHS compliance via the 'e3' suffix and tape-and-reel packaging indicated by the 'TR' suffix.

Feature Summary

• Plastic encapsulated construction offering lower thermal resistance compared to glass-body options
• Moisture classification Level 1 per IPC/JEDEC J-STD-020B requiring no dry pack
• ESD nonsensitive per MIL-STD-750 Method 1020
• Flexible axial-lead mounting terminals for standard installation

Applications

• Voltage regulation over broad operating current and temperature ranges
• Reference voltage sources in electronic circuits
• Surge protection applications

Procurement Notes

Verify that the ordering suffixes correspond exactly to the required specifications. The 'P' suffix indicates plastic construction, while 'e3' confirms RoHS compliance with annealed matte-tin plating. The 'TR' suffix specifies tape-and-reel packaging. Confirm that the manufacturer designation aligns with current corporate structures following industry acquisitions.

Selection Notes

Select this component when a 9.1 V regulation point with ±5% tolerance is required in an axial-lead format. Ensure the application stays within the 1.0-watt power dissipation limit at 25°C or follows the derating curve for higher temperatures. Verify that the lead length meets the 3/8-inch requirement for specified thermal resistance values.

Part Context

This part belongs to the widely used 1N47xxA series of 1-watt Zener diodes, covering voltages from 3.3 V to 100 V. The series is JEDEC registered and available in various screening levels and tolerances. The plastic variant offers improved thermal performance over traditional glass packages while maintaining standard mechanical dimensions for legacy compatibility.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4739A devices in DO-41 packages. Surface mount equivalents are available as SMAJ4739A or MLL4739A. Verify that substitute components meet the same 5% voltage tolerance and 1.0-watt power rating requirements.