The MMBT5551 is a bipolar transistor manufactured by WPMtek that is RoHS compliant. It features an NPN type, SOT-23 form factor, and peak collector current of 600mA. This transistor has a maximum collector-emitter voltage of 160V and a power dissipation of 300mW. It has a Collector-Base Voltage of 5V at a maximum frequency of 100 MHz. Additionally, its Base-Emitter Voltage is at 200mV when at a current of 50mA. It has a DC current gain of 100 when at the current of 10mA and a maximum operating temperature of +150°C. Its DC Collector Current leakage is rated at 50nA.