I found this SI7121DN MOSFET on dell inspiron laptop during repair and wanted to know what it is? why it is used? what are its alternatives or replacement MOSFET.
The SI7121DN is a high-performance N-channel MOSFET made by Vishay, often used in power switching applications like load switches, DC-DC converters, and battery-powered systems.
š Key Specs of SI7121DN
| Parameter | Value |
|---|---|
| Type | N-Channel MOSFET |
| Drain-Source Voltage (V<sub>DS</sub>) | 30V |
| Continuous Drain Current (I<sub>D</sub>) | ~6.5A @ 25°C (depends on V<sub>GS</sub>) |
| R<sub>DS(on)</sub> (max) @ V<sub>GS</sub>=4.5V | 19 mĪ© |
| Gate Threshold Voltage (V<sub>GS(th)</sub>) | 0.6 – 1.0V |
| Package | PowerPAK® 1212-8 |
| Logic Level Gate Drive? | Yes |
š§ Summary
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8 pins total
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Functional pins:
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4 pins Source
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3 pins Drain
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1 pin Gate
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Bottom exposed pad = Drain (also for heat sinking)
This design allows for low R<sub>DS(on)</sub>, efficient heat dissipation, and high current handling.
See some related topics on MOSFETs:
Tags:
MOSFET
