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[1] and many other countries. They were created by Philips and Mullard in 1963 and introduced in April 1966. Initially in metal (TO-18) packages, the range expanded over time to include other package types, higher voltage ratings, and a better selection of gain (hFE and hfe) groupings, as well as complementary PNP types. Some manufacturers have specified their parts with a higher power dissipation rating (Ptot) 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

Case Ptot Polarity
80VCBO

50VCBO

30VCBO
Low-Noise (<4dB)
30VCBO
Low-Noise (<4dB)
50VCBO
Notes/Source
TO-18 300mW NPN BC107
45VCEO
BC108
20VCEO
BC109
20VCEO
PNP BC177
45VCEO
BC178
25VCEO
BC179
25VCEO
Lockfit 250mW NPN BC147
45VCEO
BC148
20VCEO
BC149
20VCEO
PNP BC157
45VCEO
BC158
25VCEO
BC159
20VCEO
TO92B
(e-c-b)
300mW NPN BC167
45VCEO
BC168
20VCEO
BC169
20VCEO
PNP BC257
45VCEO
BC258
25VCEO
BC259
20VCEO
(also: BC256 64VCBO)
TO92F
(c-b-e)
300mW* NPN BC237
45VCEO
BC238
20VCEO
BC239
20VCEO
*Fairchild's power rating is 500mW
PNP BC307
45VCEO
BC308
25VCEO
BC309
20VCEO
TO92A
(e-b-c)
310mW NPN BC317
45VCEO
BC318
30VCEO
BC319
20VCEO
Note: 150mA rating; BC318 VCBO 40V to 45V[2]
PNP BC320
45VCEO
BC321
30VCEO
BC322
20VCEO
TO92F
(c-b-e)
500mW* NPN BC546
65VCEO
BC547
45VCEO
BC548
30VCEO
BC549
30VCEO
BC550
45VCEO
from Mullard 1977 and Fairchild 2001 specifications;
*Some manufacturers specify a 625mW rating
PNP BC556
65VCEO
BC557
45VCEO
BC558
30VCEO
BC559
30VCEO
BC560
45VCEO
SMD 150mW NPN BC846
65VCEO
BC847
45VCEO
BC848
30VCEO
BC849
30VCEO
BC850
45VCEO
PNP BC856
65VCEO
BC857
45VCEO
BC858
30VCEO
BC859
30VCEO
BC860
45VCEO

(see also: for a neat summary of some of the family).

Noise Figure (at 1kHz, for 2 kilohm source, BW=200Hz, IC=0.2mA/VCE=5V) is <10dB for those not tabulated as "Low Noise".

Current Ratings

All types have a maximum collector current of 100mA, except that the original Philips tentative data dated 4.4.1966 specified a maximum collector current of 100mA peak (ICM) for the BC107/8/9, and Telefunken originally specified a maximum collector current of 50mA for the BC109, but since at least 1973 all have revised collector currents of 100mA average or 200mA peak, except that the BC317-BC322 range have a 150mA (continuous) 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 (hFE)[3] groups (see BC548 Gain groupings).

References

  1. ""MiniWatt:" DIGEST" (PDF). Vol 7 Number 2. Philips Australia. February 1968. Retrieved 17 March 2014.
  2. "Micro Electronics datasheet for BC107-9, BC167-9, BC237-9,BC317-9" (PDF). Archived from the original (PDF) on 13 January 2012. Retrieved 2 August 2015.
  3. "BC546 through BC550".

See also

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