Si4858DY Vishay Siliconix New Product is a N-Channel 30-V (D-S) MOSFET with excellent performance. It is suitable for DC/DC Converters and Synchronous Rectifiers applications.
The Si4858DY is a 30‑V N‑channel power MOSFET optimized for low‑side synchronous rectifier operation. It is offered in an SO‑8 package and is intended for use in DC‑DC converters and synchronous rectifiers.
Key specifications include a continuous drain current of 20 A at 25 °C, a pulsed drain current of 60 A, typical on‑state resistance of 0.0040 Ω at VGS = 10 V, and a maximum power dissipation of 3.5 W at 25 °C. Thermal resistance is rated at 67 °C/W (junction‑to‑ambient).
| Drain‑Source Voltage (VDS) | 30 V |
|---|---|
| Gate‑Source Voltage (VGS) | 20 V |
| On‑State Resistance rDS(on) @ VGS=10 V, ID=20 A | 0.0040 Ω (typ) |
The typical on‑state resistance is 0.0040 Ω when VGS is 10 V and ID is 20 A.
The device is rated for a maximum drain‑source voltage of 30 V and a maximum gate‑source voltage of 20 V.