11/28/2023 0 Comments Bc557 vs bc547The only difference is their collector-to-emitter voltage. But most of the time they are used in 12V and below 12V circuits or 24V and below 24V circuits so there will be no problem when you are using in these types of circuits.īC547 and BC548 both are the transistor of same series and both are almost the same. So if the load requires more than 30V then you cannot use BC548 instead of BC547, in other conditions than that you will be having no problem using BC548 instead of BC547 in almost any type of circuit whether it is a switching or amplification circuit. Such as when it is used as a switch and the load(the things the transistor is driving) voltage is above 30V. In this situation, we will also look at the above ratings and characteristics comparison chart as we have already discussed all the other ratings of both the transistors are the same except the collector to emitter voltage and in this situation, there are some conditions in which we cannot use BC548 instead of BC547. The ratings of both the transistors are the same except for the collector-to-emitter voltage but the BC547 has a higher collector-to-emitter voltage than BC548 so the BC547 transistor can be used instead of BC548 in almost any condition. Ratings & Characteristics Comparison : Ratings & CharacteristicsĪs you can see in the above ratings and characteristics comparison chart the collector-to-emitter voltage of BC547 is 50V and BC548 is 30V, the collector current of both the transistors is 100mA, total device dissipation is 625mW, DC current gain is 110 to 800 and transition frequency is 300MHz. So they are pin-to-pin replacement to each other as regards the pin configuration. In the above pin comparison image we can see that the pin configuration of both the transistors are the same the first pin is “Collector”, second is “Base” and the third is “Emitter”.
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