BC108 family
The BC107, BC108 and BC109 are Silicon NPN transistors found very often in equipment and electronics books/articles from Europe, Australia[1] and many other countries. They were introduced by Philips and Mullard in 1966 in metal (TO-18) packages, but the range has expanded over time to include other package types, higher voltage ratings, and a better selection of gain (hFE and hfe) groupings, as well as complementry PNP types.
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 | Polarity | 80Vcbo | 50Vcbo | 30Vcbo | Low-Noise 30V | Low-Noise 50V | |
|---|---|---|---|---|---|---|---|
| TO-18 | NPN | BC107 | BC108 | BC109 | |||
| PNP | BC177 | BC178 | BC179 | ||||
| Lockfit | NPN | BC147 | BC148 | BC149 | |||
| PNP | BC157 | BC158 | BC159 | ||||
| TO92B (e-c-b) | NPN | BC167 | BC168 | BC169 | |||
| PNP | BC257 | BC258 | BC259 | ||||
| TO92F (c-b-e) 350mW | NPN | BC237 | BC238 | BC239 | |||
| PNP | BC307 | BC308 | BC309 | ||||
| TO92A (e-b-c) | NPN | BC317 | BC318 | BC319 | |||
| PNP | BC320 | BC321 | BC322 | ||||
| TO92F (c-b-e) 625mW | NPN | BC546 | BC547 | BC548 | BC549 | BC550 | |
| PNP | BC556 | BC557 | BC558 | BC559 | BC560 | ||
| SMD | NPN | BC846 | BC847 | BC848 | BC849 | BC850 | |
| PNP | BC856 | BC857 | BC858 | BC859 | BC860 |
(see also: for a neat summary of some of the family).
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)[2] groups (see BC548#Gain groupings).
References
- ↑ ""MiniWatt:" DIGEST". Vol 7 Number 2. Philips Australia. February 1968. Retrieved 17 March 2014.
- ↑ "BC546 through BC550".