Vishay Debuts Si4838DY and Si4879DY MOSFETs

Vishay Intertechnology (Malvern, PA) announced that Siliconix Inc. (Santa Clara, CA) has introduced two new Little Foot power MOSFETs for dc/dc converter circuits, including a PWM-optimized n-channel device with a 12V maximum breakdown voltage rating. Both new devices are intended for synchronous rectifier applications, serving low-voltage outputs in dc/dc converters for desktop computers, network or routing cards, stand-alone power supplies, and other line-powered systems where a low-voltage microprocessor is needed.

The new Vishay Siliconix Si4838DY has a 12Vds and is claimed to offer a 40-percent overall performance improvement over any comparable device. It has a maximum on-resistance of 3mW and a typical gate charge of 40nC. For applications where more headroom is required, the new Si4876DY is available. The Si4876DY is a 20V device with 5mW on-resistance and a Qg of 55nC. Siliconix claims that these specifications represent a 10-percent overall improvement compared with any competing device on the market.

Offered in the Little Foot SO-8 package, samples of the Si4838DY and Si4876DY are currently available. Production quantities are also available now, with lead times of 8 to 10 weeks for larger orders.