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1N4749UR/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：±10%
- 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 Microchip Technology 1N4749UR/TR is a surface-mountable 1.0 W glass Zener diode in the DO-213AB MELF package. It provides a nominal Zener voltage of 24 V with a standard tolerance of ±10%. The device operates within a temperature range of -65°C to +175°C and features a maximum dynamic impedance of 25 Ω at a test current of 10.5 mA. It includes RoHS compliance (e3 suffix) and offers tape-and-reel packaging options.
Feature Summary
- Hermetically sealed glass construction suitable for high reliability applications
- Surface mount design ideal for high density mounting requirements
- Inherently radiation hard per MicroNote 050
- Compatible with MIL-PRF-19500 screening standards
Applications
- Voltage regulation over broad operating current and temperature ranges
- High density circuit board layouts requiring low parasitic characteristics
- High reliability applications specified by source control drawings
Procurement Notes
Verify that the ordering suffix 'TR' corresponds to the specific tape and reel configuration required for your automated assembly process. Confirm that the component meets all necessary environmental and regulatory standards for your target market, including RoHS compliance details provided in the official datasheet.
Selection Notes
Select this component when a surface-mount Zener diode with hermetic sealing and radiation hardness is required. Ensure the 24 V nominal voltage and ±10% tolerance align with the circuit's regulation needs. Consider the thermal derating curves if the application involves elevated ambient temperatures or limited heat dissipation on the PCB.
Part Context
This part belongs to the 1N4728UR through 1N4764AUR series of surface mount 1.0 W glass Zener diodes manufactured by Microsemi, now part of Microchip Technology. The series serves as the surface mount equivalent to the JEDEC registered 1N4728A through 1N4764A axial leaded series, offering similar electrical performance in a compact DO-213AB package.
Replacement Considerations
Direct equivalents include the MLL4749A series. For axial lead replacements, consider the 1N4749A. Surface mount plastic alternatives may include SMAJ4749A variants, though hermetic sealing properties will differ.
