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Product Detailed Parameters
- Description：SILICON SWITCHING DIODES
- Series：*
- Mfr：Microchip Technology
- Package：Bulk
- Technology：-
- Voltage - DC Reverse (Vr) (Max)：-
- Current - Average Rectified (Io)：-
- Voltage - Forward (Vf) (Max) @ If：-
- Speed：-
- Reverse Recovery Time (trr)：-
- Current - Reverse Leakage @ Vr：-
- Capacitance @ Vr, F：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Operating Temperature - Junction：-
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Overview
The Microchip Technology 1N646UR-1 is a standard rectifying diode designed for surface-mount applications. It utilizes the DO-213AA (SMA) package and features an axial lead equivalent form factor adapted for SMD mounting. The device supports a maximum DC reverse voltage of 300 V and provides an average forward rectified current of 400 mA. It exhibits a low forward voltage drop of 1 V at rated current and maintains a reverse leakage current of 50 nA at full reverse voltage. The component operates within a junction temperature range of -65°C to 175°C, ensuring reliability in demanding thermal environments.
Feature Summary
- Surface-mount construction in DO-213AA package
- High reverse voltage capability up to 300 V
- Extended operating temperature range up to 175°C
Applications
- General-purpose rectification in surface-mount circuits
- Power supply input stages
- Signal demodulation
Procurement Notes
Verify the specific suffix UR-1 against official Microchip documentation to confirm the SMA surface-mount variant rather than the through-hole DO-35 version. Ensure compatibility with automated pick-and-place equipment due to the SMD footprint. Cross-reference datasheets for exact mechanical dimensions and soldering profiles required for reliable assembly.
Selection Notes
Select this component when a 300 V, 400 mA rectifier is required in a compact surface-mount format. Compare forward voltage characteristics against alternative SMA packages if power dissipation is critical. Confirm that the 175°C junction temperature rating meets the thermal design requirements of the target application environment.
Part Context
This part belongs to Microchip's standard rectifier diode family, offering robust performance for general electronic applications. The 1N646 series is widely recognized for its reliability in power conversion tasks. The UR-1 designation specifically identifies the surface-mount configuration, distinguishing it from traditional through-hole variants while maintaining similar electrical specifications.
Replacement Considerations
Direct substitutes include other SMA-packaged 300 V, 400 mA rectifiers such as the 1N5819 or generic equivalents meeting DO-213AA standards. Verify pinout compatibility and thermal resistance values before substitution.
