This is a N-Channel depletion-mode Silicon MOSFET Transistor, manufactured by Tech Public, with a SOT-23-3 package and marked with the part number NTR3C21NZT1G. It has a gate threshold of -2V and an Idss of 50µA. This part is pre-ordered, RoHS compliant and it has an operating temperature range of -55? to +150?.