1N4740P/TR12

Overview

The Microchip Technology 1N4740P/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 10 V and a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C and features a maximum reverse current of 10 µA at a test voltage of 7.6 V. Packaged in tape and reel format per EIA-296 standards, it offers flexible mounting terminals and void-free transfer molded epoxy construction.

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 void-free transfer molded thermosetting epoxy body
• Non-sensitive to electrostatic discharge (ESD)

Applications

• Voltage regulation circuits
• Reference voltage sources
• Overvoltage protection

Procurement Notes

Verify that the ordering suffix TR12 corresponds to the specified tape and reel packaging configuration as defined by the manufacturer's documentation. Confirm that the component meets RoHS compliance requirements if applicable to your assembly process. Ensure the plastic encapsulation type aligns with your thermal resistance calculations, noting the lower thermal resistance compared to glass-body options. Cross-reference the specific part number against the latest Microchip or Microsemi datasheets to validate manufacturing origin and screening levels.

Selection Notes

Select this component when a 10 V regulation point is required with ±5% tolerance. The plastic DO-41 package offers lower thermal resistance than glass equivalents. Consider the 1.0 W power dissipation rating and ensure adequate heat sinking or PCB copper area to maintain junction temperatures within limits. Verify that the 10 µA maximum reverse current meets leakage specifications for your application.

Part Context

This part belongs to the widely used 1N47xx series of silicon Zener diodes, specifically the plastic encapsulated AP variant. The series covers voltages from 3.3 V to 100 V. The 'P' suffix indicates plastic construction, while 'TR' denotes tape and reel packaging. These devices are JEDEC registered and offer extensive voltage selection for general-purpose regulation tasks.

Replacement Considerations

Direct substitutes include other manufacturers' 1N4740A or 1N4740AP parts in the DO-41 package. For plastic variants, check equivalent listings from other semiconductor suppliers ensuring 1 W power rating and 10 V Zener voltage. Surface mount equivalents like SMAJ4740A may be considered if footprint conversion is acceptable.