Also, all types of devices are divided into groups of maximum current amplification factor hFE- from A to C. For example, bc547 differs in the threshold voltages and is in the table of maximum parameters between bc546 and bc548. The datasheet for bc547 usually includes a description of similar, in terms of specifications, transistors of the series: BC546, BC548, BC549 and BC550. The figure shows the basic appearance of the device, which will vary slightly depending on the particular brand, but the specs and pin assignments remain identical. Looking at the bevel from the front, the purpose of these pins is from left to right: collector, base, emitter. The BC547 pinout will be discussed in the TO-92 (TO-226AA) package, which has three flexible leads for hole mounting. It is currently the current replacement for the older BC107 or BC147, which are included in many developments by Mullard and Philips. It was identical in its technical specifications, but was produced unlike the metal bc107 in a plastic sealed housing TO-92.
It was a joint development of the then popular bc107.
Bc547 first appeared on the market in April 1966, courtesy of Philips (Holland) and Mullard (UK).
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