It is necessary to ensure that the replacement transistor can dissipate sufficient power. It is usually important to ensure that the replacement BJT can meet any frequency limits or requirements in your device, so it will not affect the function of original application. Choosing a replacement BJT with approximately the same current gain is necessary. Exceeding voltage breakdown is fine, but you should never go below the rated breakdown voltage of the transistor you’re replacing.Ĭurrent gain is usually denoted as B or hfe. It represents the BJT’s ability to withstand the voltage. Most importantly, you need to be aware of the pin-out configuration because different suppliers may have different pin-out design configuration.Ĭhoosing this parameter such as Vceo to match the specification is necessary. It is often necessary to match the replacement package size closely, so it can physically fit on the pads/ holes of printed circuit boards. Incorrect type will reverse the voltages and may result in the destruction of the transistor or damage to your equipment.īJTs are available in many packages. It is necessary to find out whether the transistor is either NPN or PNP.
Beyond operation temperatures and typical applications, the below basic transistor parameters need to be considered. When looking for the correct BJT replacement, it is necessary to understand and consider a few related parameters in the main specification. It can feel frustrated to choose the right replacement when reading over the many parameters in these parts’ specifications. When designing or repairing electronic equipment, it sometimes becomes necessary to find replacements for Bipolar Transisitors (BJTs).
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