The UNR521600L is a surface-mount pre-biased NPN bipolar junction transistor (BJT) manufactured by Panasonic Electronic Components. It is designed to simplify circuit design by integrating the biasing resistors required for operation. The transistor features a maximum voltage rating of 50 V, a current handling capability of 100 mA, and operates with a frequency of up to 150 MHz. It has a power dissipation capacity of 150 mW and is housed in a compact SMini3-G1 package. The device exhibits a voltage drop of 250 mV at a collector current of 10 mA, has a collector cut-off current of 500 nA, and incorporates internal bias resistors with a resistance value of 4.7 kOhms.