The NTE2028 is an integrated circuit in a 16Lead DIP type package custom designed to decode four lines of BCD and drive a gasfilled sevensegment display tube. Each output constitutes a switchable, adjustable current sink which provides constant current to the tube segment, even with high tube anode supply tolerance or fluctuation. These current sinks have a voltage compliance from 3V to at least 80V; typically the output current varies 1% for output voltage changes of 3 to 50V. Each bit line of the decoder switches a current sink on or off as prescribed by the input code. Each current sink is ratioed to the boutput current as required for even illumination of all segments.