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OC36 Transistor Data
Key transistor data for the OC36 PNP germanium power transistor for output stages including key electrical parameters, pinout, package type and many other key transistor datasheet details.
The OC36 was an audio power output transistor housed in a TO3 encapsulation. It was described in the datasheets as being a PNP germanium alloy transistor for power switching applications.
The transistor was used in circuits including audio amplifier output stages as well as in power supplies and various DC switching circuits.
Key details and performance parameters for the OC36 transistor.
| OC72 transistor datasheet parameters & data |
|
|---|---|
| Parameters | Details |
| Transistor type | PNP germanium power transistor |
| Package type | TO3 |
| VCBO max (V) | -80 |
| VCEO max (V) | -32 |
| VEBOmax (V) | -40 |
| IC max (A) | 8 |
| TJ Max °C | 100 |
| PTOT W | 30 |
| fT min (MHz) | 0.2 |
| COB | 200pF |
| hfe | 30 min |
| IC for hfe | 1 A |
| 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
• Further details
The OC36 was part of a series of transistors including the OC28, 29, 35 and the OC36.
They are described in the Mullard databook as being power junction transistors of the PNP alloy type intended (or use in medium and high voltage and high current switching applications.
Matched pairs of each type were available under the type number 2-OC.
Despite being described as being primarily switching transistors, they were often used as the power output devices in audio amplifiers.
Although they weren't cheap, they could be obtained for reasonable prices for home construction of these circuits.
Written by Ian Poole .
Experienced electronics engineer and author.
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