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The FQS4901 is a 400 V dual N‑channel MOSFET built with Fairchild’s proprietary planar stripe DMOS technology. It offers low gate charge, low output capacitance, fast switching, and improved dv/dt capability, making it suitable for high‑efficiency switch‑mode power supplies and half‑bridge lamp ballasts.
The document lists absolute maximum ratings, electrical characteristics, typical performance curves, test circuit diagrams, and package dimensions (8‑lead SOP). It also includes trademark, disclaimer, life‑support policy, and product status information.
| Drain‑Source Voltage (V_DSS) | 400 V |
|---|---|
| Continuous Drain Current (I_D) at 25 °C | 0.45 A |
| Pulsed Drain Current (I_D) (Note 1) | 1.8 A |
| Gate‑Source Voltage (V_GS) | ±25 V |
| Power Dissipation at 25 °C (P_D) | 2.0 W |
The FQS4901 can withstand a drain‑source voltage of up to 400 V.
The continuous drain current is rated at 0.45 A when the case temperature is 25 °C.
The device is supplied in an 8‑lead SOP (8SOP) package.