SI4425B SI4425 4425B-P-Channel MOSFET SMD-8

The SI4425B (also marked SI4425 or 4425B) is a high-performance P-Channel MOSFET widely used in laptop motherboards, DC-in switching circuits, battery charging paths, and power protection stages. Its low RDS(on) and fast switching capability make it ideal for reverse-polarity protection, load switching, and efficient power gating applications. Packaged in a compact SMD-8 / SO-8 form factor, it offers excellent thermal performance and stable operation in high-density electronics. This MOSFET is commonly found in HP, Dell, Lenovo, Acer, and other laptop platforms where reliable low-side control and high-efficiency switching are critical. At OKSpare, we maintain IC ready stock OKSpare, IC supplier OKSpare, and IC available at OKSpare, providing genuine MOSFETs at the best price, all quality tested by the OKSpare team.

• P-Channel MOSFET for low-voltage power management

• Low RDS(on) for efficient switching

• SMD-8 / SO-8 package with good thermal stability

• Ideal for DC-in, charger, and reverse-protection circuits

• Fast switching for reliable power gating

• Suitable for laptop motherboards and compact electronics