1N4739APE3/TR12

Overview

The Microchip Technology 1N4739APE3/TR12 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, manufactured by the Microsemi Scottsdale Division. It provides voltage regulation at a nominal Zener voltage of 9.1 V with a standard tolerance of plus or minus 5%. The device operates within a temperature range of -65°C to +150°C and features a plastic DO-41 (DO-204AL) package. Electrical characteristics include a maximum dynamic impedance of 5.0 Ohms at a test current of 28 mA, a maximum reverse current of 10 µA at 7 V, and a steady-state power dissipation of 1.0 watts.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard installation
• Constructed with a void-free transfer molded thermosetting epoxy body

Applications

• Voltage regulation circuits requiring 1.0 watt power handling
• Power supply reference applications
• Protection against overvoltage conditions

Procurement Notes

Verify that the ordering suffix matches the required specifications. The 'e3' suffix indicates RoHS compliance, while 'TR' denotes tape and reel packaging. Confirm the manufacturer origin as Microsemi Scottsdale Division. Ensure the component meets the specific JEDEC registration requirements for the 1N4739A type number before procurement.

Selection Notes

Select this component when a 9.1 V Zener voltage with 5% tolerance is required. The plastic construction offers lower thermal resistance compared to glass-body options. Verify that the application environment supports the specified operating temperature range of -65°C to +150°C. Consider the 1.0-watt power dissipation rating and the need for adequate heat sinking or PCB copper pad area for thermal management.

Part Context

This part belongs to the popular 1N4728AP through 1N4764AP series of 1.0-watt Zener diodes. The series covers a voltage selection from 3.3 to 100 volts. These plastic encapsulated devices are moisture classified as Level 1 per IPC/JEDEC J-STD-020B, eliminating the need for dry pack storage. They serve as standard replacements for glass-body equivalents in various electronic designs.

Replacement Considerations

Consult the factory for surface mount equivalents such as SMAJ4739A or MLL4739A. Military screening levels are available via prefixes like MQ, MX, MV, or MSP. Verify compatibility with existing PCB footprints if transitioning from glass-body variants.