1N4742APE3/TR12

Overview

The Microchip Technology 1N4742APE3/TR12 is a silicon unidirectional voltage regulator diode belonging to the 1N4728AP through 1N4764AP series. It provides a nominal Zener voltage of 12 V with a standard tolerance of ±5%. The device features a maximum power dissipation of 1.0 W at 25°C and operates within a temperature range of -65°C to +150°C. Electrical characteristics include a test current of 21 mA, a maximum dynamic impedance of 9 Ohms, and a maximum reverse current of 5 µA. The component utilizes a plastic DO-41 (DO-204AL) axial-lead package and is supplied in tape and reel format.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard circuit integration
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Moisture classification is Level 1 per IPC/JEDEC J-STD-020B requiring no dry pack

Applications

• Voltage stabilization circuits
• Voltage regulation over broad operating ranges
• General purpose discrete semiconductor applications

Procurement Notes

Verify that the ordering suffix matches the required specifications. Confirm the 'e3' designation indicates RoHS compliance and the 'TR' suffix confirms tape and reel packaging. Ensure the 'P' suffix corresponds to the plastic encapsulated construction rather than glass body options. Cross-reference the manufacturer's official documentation to validate the specific electrical tolerances and screening levels associated with this exact part number before procurement.

Selection Notes

Select this component when a 12 V reference with ±5% tolerance is required in an axial-lead configuration. The plastic DO-41 package offers lower thermal resistance compared to glass-body equivalents. Consider the 1.0 W power dissipation capability and the specified operating temperature limits. Verify compatibility with the intended PCB layout regarding lead spacing and thermal management requirements for steady-state operation.

Part Context

This device belongs to the widely recognized 1N47xx series of 1.0 Watt Zener diodes manufactured by Microsemi (now Microchip Technology). The series covers an extensive voltage selection from 3.3 V to 100 V. The 'AP' designation specifically identifies the plastic encapsulated variant, while the 'e3' suffix denotes environmental compliance. These components are JEDEC registered and serve as standard discrete regulators in various electronic systems.

Replacement Considerations

Surface mount equivalents are available as SMAJ4742A or MLL4742A. Other manufacturers producing JEDEC registered 1N4742A devices may offer functional replacements, provided the package type, power rating, and voltage tolerance align with the design requirements.