Check the listing for details. 3 CUI Inc V-infinity Switch-Mode Switching Regulator 7805 DC/DC Buck Converter. Condition: New. Listed at 12.95 USD. This is a Brand New lot of 3 CUI Inc. V-infinity Switch-Mode Switching DC/DC Buck Converters...... that are direct replacements to the clumsy and crude 7805 regulator. With this device, just drop it in your circuit as if it's something like an LM317 (+Vin, ADJ, +Vout). You don't even have to worry about miswiring the pins; this pinout is exactly the same as the 7805's/LM317's pinout!OK, so why swap? Because this device is a dedicated switching regulator, complete with a on-board precision oscillator and output MOSFET stage that does the actual hi-speed switching. This differs from LM317/7805 operation, which does little more than regulates an input voltage level to an imprecise output voltage or current level.What does a precision switching effect have on the purity and efficiency of the +5Vdc output? It means you're getting a 95% efficient output. This is why you don't need a heatsink, and why the low, low 20-60% efficiencies of 7805's do need a heat sink. Some specificatuions:• up to 500 mA current output• pin compatible with LM7805 linear regulators • non-isolated switching regulator • high start-up current capability • wide input voltage range • efficiency 95% • low ripple and noise • short circuit protection • ultra-compact SIP3 package • -40°C to +85°C temperature range Total Parts will guarantee you're totally happy with your purchase! 14 Day Return Policy if merchandise is in unused condition.We promise to ship your merchandise fast!We promise to send you tracking information immediately when shipped!We promise to respond to your questions and concerns!If you have any questions, concerns or suggestions please contact us through the eBay messaging system.Please take a moment to see our current specials on eBay our other eBay listings. Powered by SixBit's eCommerce Solution