Technically, this creates an incredibly high current gain (often denoted as $h_{FE}$). While a standard transistor might offer a gain of 100, the BD679 offers a gain of . This means a microscopic amount of current at the input can control a massive load at the output.
Because it represents the . If you have a microcontroller (like an Arduino) that outputs a tiny 5V signal at 20mA, you cannot drive a 12V motor directly. You could use a MOSFET, but you might need a driver for it. With the BD679, the massive gain means you can often connect the microcontroller almost directly to the base (with a single resistor) and drive a heavy load. bd679 datasheet
Note: Always refer to the official manufacturer’s datasheet (e.g., STMicroelectronics, ON Semiconductor, or equivalent) for absolute maximum ratings and electrical characteristics specific to your production part number and date code. Technically, this creates an incredibly high current gain
According to the BD679 datasheet from STMicroelectronics and other major manufacturers like ON Semiconductor , the transistor features the following ratings: BD679 MULTICOMP PRO, Darlington Transistor, Darlington, NPN Because it represents the
Let’s dive into the datasheet and decode why this component became a workhorse of electronics and remains relevant today.