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1N4705UR-1
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Product Detailed Parameters
- Description：DIODE ZENER 18V 500MW DO213AA
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：18 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：-
- Current - Reverse Leakage @ Vr：50 nA @ 13.6 V
- Operating Temperature：-65°C ~ 175°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：DO-213AA
- Voltage - Forward (Vf) (Max) @ If：1.5 V @ 100 mA
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Overview
The 1N4705UR-1 is a hermetically sealed, metallurgically bonded glass surface mount Zener voltage regulator manufactured by Microchip Technology. It utilizes the DO-213AA (MELF-2) package and operates with a nominal Zener voltage of 18V at a test current of 50 µA. The device provides a standard tolerance of 5% and supports a maximum power dissipation of 0.5W. Designed for unidirectional applications, it features an isolated case connection and round glass encapsulation suitable for high-reliability environments.
Feature Summary
- Hermetically sealed metallurgical bond construction for enhanced reliability
- Low operating current capability with a 50 µA test current specification
- Surface mount DO-213AA glass MELF package design
Applications
- High-reliability military screening applications
- Precision low-current voltage regulation circuits
- Harsh environment surface mount electronics
Procurement Notes
Verify that the specific part number includes the "-1" suffix to confirm the internal metallurgical bond option, as this distinguishes the component from standard non-bonded variants within the same series. Confirm RoHS compliance status, as indicated by manufacturer data, prior to final procurement decisions to ensure alignment with project environmental requirements.
Selection Notes
Select this component when a hermetically sealed, surface-mount Zener diode with low leakage and precise voltage regulation is required. The 18V rating and 0.5W power dissipation define its operational limits. Ensure the DO-213AA footprint matches the PCB layout constraints and that the unidirectional configuration aligns with the circuit topology.
Part Context
This device belongs to the 1N4678UR-1 through 1N4717UR-1 series of 0.5-watt glass surface mount Zener regulators. The series offers voltages ranging from 1.8V to 43V in 5% tolerances. The "-1" suffix specifically denotes the internally bonded package construction available with equivalent military screening options.
Replacement Considerations
Equivalent parts include the 1N4705UR/TR or other 1N4705 variants from different manufacturers, provided they match the 18V Zener voltage, 0.5W power rating, and DO-213AA/MELF-2 package dimensions.
