TruOpto 3mm LED 12V With Resistor – TruOpto OSW5DK3131A-12V, This white 3mm LED has a 12V voltage input and an integral current limiting resistor ensuring that the LED is TTL compatible. Having an integral resistor means that component count is reduced giving space saving and reduced cost benefits making this LED ideal for use in a wide range of lighting and indicative applications. TruOpto OSW5DK3131A-12V 12V 3mm White LED 4200mcd