BC546 BC547 BC548 BC549 BC550 - NPN Epitaxial Silicon Transistor Keywords BC546, BC547, BC548, BC549, BC550, NPN Epitaxial Silicon Transistor Using LCD display with arduino needs many I/O lines of your microcontroller. Never again with the I2C adapter !!! In this tutorial I've used a PCF8574A shift register I2C interfaced. The advantages are: it's cheap and on the web is available a library written for our purposes ... bc548 bc548a bc548b bc548c.pdf Size:21K _fairchild_semi. Discrete POWER & Signal Technologies BC548 BC548A BC548B BC548C E TO-92 B C NPN General Purpose Amplifier This device is designed for use as general purpose amplifiers and switches requiring collector currents to 300 mA. Sourced from Process 10. See PN100A for characteristics.