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OC44 Transistor Data
Key transistor data for the OC44 PNP RF germanium transistor including key electrical parameters, pinout, package type and many other key transistor datasheet details.
The OC44 was a PNP germanium transistor used for RF applications with an fT of 8 MHz. It was aimed at low RF frequencies and was used in a variety of transistor radios in the RF sections of the circuit.
Key datasheet details and performance parameters for the OC44 transistor.
| OC44 transistor datasheet parameters & data |
|
|---|---|
| Parameters | Details |
| Transistor type | PNP germanium RF transistor |
| Package type | X02 |
| VCBO max (V) | -15 |
| VCEO max (V) | -15 |
| VEBOmax (V) | -12 |
| IC max (mA) | 10 |
| TJ Max °C | 80 |
| PTOT mW | 83 |
| fT min (MHz) | 8 |
| COB | 12 |
| hfe | 100 min |
| IC for hfe | 1 mA |
| Similar / equivalents | |
Outline:
Pinout:
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 parameters 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.
Notes and supplementary information
The OC44 was the recognised RF transistor from Philips / Mullard in the late 1950s and early 1960s. It enabled some RF amplification to be provided at frequencies at the low end of the MF portion of the radio spectrum.
It was used in many small transistor radios of the day, often as the RF / mixer transistor in a superheterodyne radio.
Written by Ian Poole .
Experienced electronics engineer and author.
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