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BC109 Transistor Data
Key transistor data for the BC109 audio transistor including key electrical parameters, pinout, package type and many other key transistor details.
Key details and performance parameters for the BC109 transistor.
| BC109 transistor parameters & data |
|
|---|---|
| Parameters | Details |
| Transistor type | NPN silicon audio transistor |
| Package type | TO18 |
| VCBO max (V) | 30 |
| VCEO max (V) | 20 |
| VEBOmax (V) | 5 |
| IC max (mA) | 100 |
| TJ Max °C | 175 |
| PTOT mW | 300 |
| fT min (MHz) | 150 |
| COB | 6p |
| hfe | 180 min |
| IC for hfe | 2mA |
| Similar / equivalents | BC107 |
Outline:
Pinout:
Notes: A very useful basic audio transistor - now obsolete. It was one of the mainstay general purpose transistors for many years and it is still available through some suppliers even to this day
Explanation of transistor parameters
| Parameter | Explanation |
|---|---|
| VCBO Max | Maximum collector-base voltage with emitter open circuit . |
| VCEO Max | Maximum collector-emitter voltage with base open circuit. |
| VEBO Max | Maximum emitter-base voltage with collector open circuit. |
| VCEsat (included where applicable) | The voltage drop across the collector-emitter when the transistor is fully saturated (acting as a closed switch). |
| IC Max | Maximum collector current. |
| Parameter | Explanation |
|---|---|
| TJ | Maximum junction temperature. |
| PTOT Max | Maximum device dissipation normally in free air at 25°C unless other conditions indicated. |
| fT Min | Minimum cutoff frequency at which the current gain in a common emitter circuit falls to unity. |
| COB Max | Maximum collector capacitane, normally measured with emitter open circuit. |
| hFE | DC current gain for HFE at IC. [Note hfe is the small signal gain and although this may be slightly different, the transistor current gain will vary considerably from ne transistor to the next of the same type.] |
| PTOT Max | Maximum device dissipation normally in free air at 25°C unless other conditions indicated. |
These are the main transistor parameers that have been included in our list. There are others, but these help quantify the main elements of the performance of the transistor.
Please note, that the data given is the best estimate we can give within a tabulated summary of this nature. Parameters also vary between manufacturers. Electronics Notes cannot accept any responsibility for errors, inaccuracies, etc, although we do endevaour to ensure the data is as accurate as possible.
Written by Ian Poole .
Experienced electronics engineer and author.
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