AO4459 datasheet in PDF form, 599 KB. The AO4459 is an Alpha and Omega Semiconductor P-channel MOSFET in an SO-8 package, frequently found in laptop charging and power-path circuits. The document lists the pin arrangement, maximum voltage and current, on-resistance and gate characteristics. Technicians use it to identify source, drain and gate pins on the board, verify whether the part is switching correctly, and choose a compatible replacement when the original transistor is shorted or burnt.
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