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1N4742P/TR8
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Product Detailed Parameters
- Description：DIODE ZENER 12V 1W DO204AL
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Voltage - Zener (Nom) (Vz)：12 V
- Tolerance：±10%
- Power - Max：1 W
- Impedance (Max) (Zzt)：9 Ohms
- Current - Reverse Leakage @ Vr：5 µA @ 9.1 V
- Operating Temperature：-65°C ~ 150°C
- Mounting Type：Through Hole
- Package / Case：DO-204AL, DO-41, Axial
- Voltage - Forward (Vf) (Max) @ If：1.2 V @ 200 mA
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N4742P/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 12 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 9 ohms at a test current of 21 mA. It includes a tape and reel packaging option indicated by the TR suffix.
Feature Summary
- Provides stable voltage regulation across a broad operating current and temperature range
- Features flexible axial-lead mounting terminals for through-hole applications
- Constructed with a void-free transfer molded thermosetting epoxy body
Applications
- Voltage regulation circuits
- Reference voltage sources
- Overvoltage protection
Procurement Notes
Verify that the component matches the specific JEDEC registered part number and plastic construction requirements. Confirm the presence of the TR suffix indicates tape and reel packaging rather than bulk or tube formats. Ensure the manufacturer documentation aligns with the required screening levels and environmental compliance standards for the intended application.
Selection Notes
Select this component when a 12 V regulation point is required with a 5% tolerance. Consider the 1.0-watt power dissipation capability and the thermal resistance characteristics for heat management. Evaluate the axial lead configuration against available board space and mounting constraints compared to surface mount alternatives.
Part Context
This device belongs to the widely used 1N47xxA series of silicon Zener diodes manufactured by Microsemi. The 'P' suffix designates the plastic encapsulated version, which offers lower thermal resistance compared to glass-body options. The series covers a voltage selection from 3.3 to 100 volts, providing extensive options for various circuit design needs.
Replacement Considerations
Equivalent parts include other manufacturers' 1N4742A devices meeting the same electrical specifications. Surface mount equivalents such as SMAJ4742A are available for designs requiring different form factors.
