FETs were feeble low-current devices, barely able to run more than a few tens of milliamps, until the late 1970s, when the Japanese introduced “vertical-groove” MOS transistors. Power MOSFETs are now made by all the manufacturers of discrete semiconductors (e.g., Diodes-Inc, Fairchild, Intersil, IR, ON Semiconductor, Siliconix, Supertex, TI, Vishay, and Zetex, along with European companies like Amperex, Ferranti, In?neon, NXP, and ST, and many of the Japanese companies such as Renesas and Toshiba); they are called, variously, VMOS, TMOS, vertical DMOS, and HEXFET. Even in conventional transistor power packages such as D-PAK they can handle surprisingly high voltages, and peak currents over 1000 amps, with RON below 0.001 Ω. Small-power MOSFETs sell for much less than a dollar, and they’re available in all the usual transistor packages. You can also get arrays in standard multipin IC packages such as the traditional dual in-line package and the smaller surface-mount varieties such as SOT-23, SOIC, and TSOP.