This IC in a TO92 package is a 3-terminal adjustable current source with a 10000 to 1 range in operating current excellent current regulation & a wide dynamic voltage regulation of 1V to 40V. Current is established with one resistor connected between pins 1 R & 3 -V & no other parts are required. The current is equal to 0.0677V divided by the resistor in ohms i.e. for 1m A R 68andohm at 25C. Currents may be set in the range 1andmicro A to 10m A & regulation is 0.02 per volt. Initial current accuracy is andplusmn 3 typical. Reverse voltages of up to 20V will draw only a few microamps allowing the device to act as a rectifier & current source in AC applications. The current is also directly proportional to the temperature at the rate 0.33 per C. Zero drift operation can be obtained by adding one resistor & one diode. Applications include bias networks surge protection low power reference ramp generation LED driver & temperature sensing.