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1N4742AUR/TR
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Product Detailed Parameters
- Description：DIODE ZENER 12V 1W DO213AB
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Voltage - Zener (Nom) (Vz)：12 V
- Tolerance：±5%
- Power - Max：1 W
- Impedance (Max) (Zzt)：9 Ohms
- Current - Reverse Leakage @ Vr：5 µA @ 9.1 V
- Operating Temperature：-65°C ~ 175°C
- Mounting Type：Surface Mount
- Package / Case：DO-213AB, MELF (Glass)
- Voltage - Forward (Vf) (Max) @ If：1.2 V @ 200 mA
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N4742AUR/TR is a single Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 12 V with a tolerance of 5%. The device operates in the SMD/SMT DO-213AB-2 package and dissipates up to 1 W of power. Key electrical characteristics include a maximum reverse leakage current of 1 uA, a Zener impedance of 9 Ohms at a test current of 21 mA, and a forward voltage of 1.2 V. It supports an operating temperature range from -65 C to +175 C.
Feature Summary
- Provides stable voltage regulation using a single Zener junction configuration.
- Constructed in a compact surface-mount DO-213AB-2 package for automated assembly.
- Capable of operation across a wide industrial temperature range up to 175 C.
Applications
- Voltage reference circuits requiring precise potential levels.
- Overvoltage protection stages in sensitive electronic systems.
- General-purpose voltage regulation within power supply architectures.
Procurement Notes
Verify the specific suffix UR/TR against official Microchip documentation to confirm the reel packaging format and tape-and-reel specifications. Ensure the DO-213AB-2 footprint matches the target PCB design. Confirm RoHS compliance status as indicated by the manufacturer's current datasheet, noting that some variants may carry different environmental declarations.
Selection Notes
Select this component when a 12 V regulation point is required in a surface-mount environment. The 1 W power rating allows for moderate current handling, while the low leakage current ensures minimal standby drain. Verify that the 9 Ohm impedance meets the noise and stability requirements of the specific circuit application.
Part Context
This part belongs to the standard 1N47xx series of Zener diodes manufactured by Microchip Technology. The 'A' designation typically indicates a tighter voltage tolerance compared to non-suffixed versions. The 'UR' suffix denotes the specific surface-mount MELF-style package, while '/TR' specifies the reel quantity packaging method for high-volume manufacturing.
Replacement Considerations
Cross-reference with other manufacturers offering 1N4742 equivalents in the DO-213AB package. Verify pinout compatibility and thermal dissipation capabilities before substitution. Ensure the replacement part meets the same 12 V nominal voltage and 5% tolerance requirements.
