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1N4749AUR/TR
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Product Detailed Parameters
- Description：DIODE ZENER 24V 1W DO213AB
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Voltage - Zener (Nom) (Vz)：24 V
- Tolerance：±5%
- Power - Max：1 W
- Impedance (Max) (Zzt)：25 Ohms
- Current - Reverse Leakage @ Vr：5 µA @ 18.2 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 1N4749AUR/TR is a single silicon Zener diode manufactured by Microchip Technology, designed for voltage regulation applications. It features a nominal Zener voltage of 24 V with a tolerance of ±5%. The device is housed in a DO-213AB (MELF) glass package and supports surface mount installation. It has a maximum power dissipation of 1 W and operates within a temperature range of -65°C to +175°C. Key electrical parameters include a maximum reverse leakage current of 100 nA, a maximum dynamic impedance of 25 Ω, and a test current of 10 mA.
Feature Summary
- Hermetically sealed glass MELF package construction
- High reliability design suitable for demanding environments
- Wide operating temperature range extending to +175°C
Applications
- Voltage regulation circuits
- Overvoltage protection systems
- Reference voltage generation
Procurement Notes
Verify the specific suffix UR/TR against official Microchip documentation to confirm tape-and-reel packaging and RoHS compliance status. Ensure the DO-213AB footprint matches the target PCB layout. Confirm that the 24V nominal voltage and 1W power rating align with the circuit requirements before finalizing procurement.
Selection Notes
Select this component when a hermetically sealed, high-reliability Zener diode is required for surface mount applications. The DO-213AB package offers a compact form factor compared to axial leads. Consider the 25 Ω dynamic impedance and 100 nA leakage current specifications for precision regulation needs. Verify thermal management capabilities for the 1 W dissipation limit at elevated ambient temperatures.
Part Context
This part belongs to the 1N4749 series of Zener diodes, which are widely used for voltage reference and regulation. The 'A' designation typically indicates a tighter tolerance band, while the 'UR/TR' suffix denotes the specific reel packaging format. Microchip Technology produces this series to meet military and industrial standards for reliability.
Replacement Considerations
Cross-reference with other manufacturers offering DO-213AB packaged Zener diodes with 24V nominal voltage and 1W power rating. Verify pinout compatibility and thermal characteristics. Ensure substitute parts meet the same hermetic sealing and temperature range requirements if applicable.
