insight Transistor Data and change

If, for some reason, you can't get an exact replacement for the transistor that you want to replace, you can refer to one of the transistor substitution guides or book, and try to recognize a "near replacement". Beware, however. A substitution guide will sometimes list a replacement for your part, even though the two parts are not very similar. The most generally used transistor substitution guides is the Philips Ecg semiconductors master replacement Guide. Selecting the right transistor parameters or specifications for the equipment you repair will avoid callbacks from customers. Callbacks or repeated repairs due to wrong transistor substitution will cost you extra money and a waste of time.

Some leading transistor parameters are:

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Maximum collector-to-base voltage (Vcbo) - The replacement part should have a Vcbo rating equal to or higher than the original.

insight Transistor Data and change

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Maximum collector-to-emitter voltage (Vceo) - The replacement part should have a Vceo rating equal to or higher than the original.

Maximum emitter-to-base voltage (Vebo) - The replacement part should have a Vebo rating equal to or greater than the original.

Maximum assembler current (Ic) - The replacement part should be able to deal with as much (or more) assembler current as the original.

Power dissipation (Pd Watts) - The replacement part should be able to dissipate as much (or more) power as the original part.

Gain (hFe) - The replacement should have a gain equal to or best than the original and it should be as close to the original specification as possible.

Gain-bandwidth (fT) - the replacement should have a transition frequency equal to or faster than the original and it should be as close to the original specification as possible.

Below is a table of application requirement and leading specification that you can use for guidelines when comes to transistor substitution.

Application Requirement and leading Specifications

1. Normal purpose low level amplifier and switching transistors. Spec- hFe, Ic (max), fT, Vceo

2. Power switching applications. Spec- Vceo, Vcbo, hFe, Ic (max), Pd (max)

3. Low level If/Rf amplification. Spec- Ic (max), fT, Vceo

4. Audio amplification. Spec- Ic (max), Pd (max), hFe, Vceo

5. High voltage transistors. Spec- Vceo, Vcbo, Ic (max), fT

Remember, the replacement transistor should not run hot and if qoute still persist, try someone else replacement amount or get the original amount if possible. Do not overlook that the surrounding components also may caused the transistor to run hot even if original amount is used.

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