This is the Texas Instruments LM334Z 3-terminal adjustable current source. The regulator only needs one resistor to set the output current. No seperate power supply connections are needed as this is a true floating current source. It can have up to 20V reverse voltage applied and will act as a rectifier allowing only a few microamps of current o flow. With the addition of another resistor and a diode the regulator operates with zero temperature drift. Applications for the current sources include bias networks, surge protection, low power reference, ramp generation, LED driver, and temperature sensing. * Programmable output current from 1µA to 10mA * Operating voltage range 1V to 40V * 0.02%/V current regulation * ±3% initial accuracy * TO-92 package We also supply the National Semiconductor LM334 in a TO-92 or SO-8 packages.