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AC155 Transistor Data

Key transistor data for the AC155 germanium PNP high frequency (for its day) transistor including key electrical parameters, pinout, package type and many other key transistor details.

The AC155 was an PNP germanium alloy transistor intended as AF amplifier. It was manufactured by a variety of companies including: mazda, AEI-Thorn (GB), etc.

AC155 germanium AF transistor as manufactured by Mazda
AC155 germanium AF transistor as manufactured by Mazda


Key details and performance parameters for the AC155 transistor.


AC155 Transistor Datasheet Parameters & Data
 
Parameters Details
Transistor type PNP germanium transistor
Package type TO1
VCBO max (V) -26
VCEO max (V) -16
VEBOmax (V) -3
IC max (mA) 80
TJ Max °C 80
PTOT mW 200
fT min (MHz) 700
COB 60p
hfe 15 min
IC for hfe 1 mA
Similar / equivalents AC125

    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

 

This transistor was one of a line of audio transistors that was common at the time.

They were manufactured by a number of companies: Siemens, Mazda (as can be seen from the photo), and others.

Ian Poole   Written by Ian Poole .
  Experienced electronics engineer and author.




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