To safely run this transistor for good performance for a long time in your electronic circuit, do not operate it at -45V DC, always use a suitable base resistor, do not provide this transistor with more than -100mA load, the operating and storage temperature around the transistor should be between -65 and +150 degrees Celsius, and always check the transistor's pinout before placing it in the circuit. Aside from these applications, this transistor can also be used as a switch in electronic applications for a 100mA load, switching any part of an electronic circuit, other high-power transistors, LEDs, relays, and so on. This transistor can also be used in audio preamplifier stages due to its high gain. Remember that when the transistor is turned off, there is a current at the base terminal, whereas when the transistor is turned on, there is no current at the base terminal.īecause the BC557 is a general purpose transistor, it can be used in a wide range of general purpose applications, such as audio amplifiers in small radios, electronic buzzers, electronic bells, and other sound circuits that require low amplification. In the NPN case, holes are emitted from the emitter instead of electrons, and they are collectors via the collector terminal.īC557 is known as a current controlled device because the small current present at the base side is used to control the large current present at the remaining terminals. Although holes are the majority carriers, the base terminal is still important in the overall operation of the transistor. In PNP transistors, holes are the majority carriers, whereas in NPN transistors, electrons are the majority carriers. The output pins of some equivalents are different please see pinout details of the equivalent transistor before replacing in the circuit. NPN Complementary: NPN Complementary of BC557 is BC547 The transistor also has a good collector to emitter (VCE) value of -45V, so it can be used in circuits requiring 40 to 45 volts DC.Ĭontinuous Collector current (IC) is 100mA The maximum collector dissipation is 500 milliwatt, which is another advantage for using it in amplification stages.įurthermore, it will perform well when used as a switch for loads less than 100mA. ![]() The HFE ratings of BC557 can be determined by the last letter after its number, for example, BC557A HFE ratings range from 110-220, BC557B HFE ratings range from 200-450, and BC557C HFE ratings range from 420-800. ![]() Its HFE ratings range from 125 to 800, making it an ideal transistor for use as a small signal amplifier in electronic circuits such as audio signal amplification. It is a general-purpose PNP transistor that can be used in electronic circuits as a switch or amplifier. How to safely long run BC557 in a circuitīC557 is a popular PNP bipolar junction transistor that comes in a small TO-92 package.
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