BC108 family


The BC107, BC108 and BC109 are general-purpose low power silicon NPN bipolar junction transistors found very often in equipment and electronics books/articles from Europe, Australia and many other countries from the 1960s. They were created by Philips and Mullard in 1963 and introduced in April 1966. Initially in metal packages, the range expanded over time to include other package types, higher voltage ratings, and a better selection of gain groupings, as well as complementary PNP types. Some manufacturers have specified their parts with a higher power dissipation rating than others.
The BC548 is an example of the modern low-cost member of this family, still in a through-hole package, while the BC848 is the surface-mount version.

Table of BC107 to BC860 variants

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Noise figure is <10 dB for those not tabulated as "Low Noise".

Current ratings

All types have a maximum collector current of 100 mA, except that the original Philips tentative data dated 4.4.1966 specified a maximum collector current of 100 mA peak for the BC107/8/9, and Telefunken originally specified a maximum collector current of 50 mA for the BC109, but since at least 1973 all have revised collector currents of 100 mA average or 200 mA peak, except that the BC317-BC322 range have a 150 mA rating.

A,B and C gain groupings

The above devices' type numbers may be followed by a letter "A" to "C" to indicate low to high gain groups.

Other characteristics

Transistors in this family: