Once this transistor is completely biased then it allows maximum current to supply across the two terminals like emitter & collector, which is known as saturation region. Transistor biased when we supply current toward the base terminal, this base current must be restricted to 5mA. The highest quantity of current that could supply throughout the collector terminal is 100mA, so by using this transistor, we cannot attach loads that use above 100mA. The gain value of the BC557 transistor ranges from 110 – 800, so this value decides the transistor’s amplification capacity. This transistor is reverse biased when a signal is given to the base terminal. In a BC557 transistor, the two terminals like emitter & collector will be forward biased by connecting the base pin to the ground terminal. When the transistor is used as an amplifier, then the DC current gain can be measured through the following formulae.ĭC Current Gain = IC (Collector Current)/IB (Base Current) So this configuration is used in most applications. This transistor uses different configurations to amplify voltage, current & power like common emitter, common base & common collector.įrom the above three types of configurations, the common-emitter or CE is very famous. Whenever the transistor works in an active region then it performs like an amplifier. The base current value should not go above mA. This resistor (RB) value can be measured by using the following formula.įor this transistor, the emitter-base voltage like VBE must be 5V & the IB (Base current) mainly depends on the IC (Collector current). So a transistor must be connected with the base terminal in series. The max biasing current is 5mA otherwise it will damage the transistor. This biasing can be obtained by providing the necessary quantity of current toward the base terminal. In forward bias, this transistor works like a switch whereas in reverse bias the same transistor works as an amplifier. Once a BC557 transistor functions like a switch then it is operated within two regions like Cut-Off & Saturation. BC557 Transistor Circuit BC557 Transistor as a Switch These are the two main applications of this transistor like a switch and an amplifier. The transistor-like BC57 transistor can be used like a switch and an amplifier within the circuit. Once the transistor is switched off, the current will be there at the base terminal, while the transistor is switched on, there is no flow of current at the same terminal. The following steps must consider while protecting a BC557 transistor. The BC557A transistor gain ranges from 110 to 220, BC557B transistor ranges from 200 – 450, BC557C transistor ranges from 420 – 800. The current gain of this BC557 transistor ranges from 110 & 800. The complimentary of BC557 NPN transistor is BC547. Handling capability of current & power is highĮquivalent BC557 PNP Transistors are BC157, 2N3906, BC558, 2SA1943, S8550, BD140, TIP127 & TIP42.Process technology used in this transistor is advanced.Junction Temperature (Tstg) is 150 Centigrade.
Bc557 transistor Pc#
Collector Dissipation or Pc Max is 500 mW.Max fT or Transition Frequency is 100 MHz.
Collector Base Voltage or VCB Max is-50V.DC current gain Max or Min (hFE) is 125 – 800.Collector-Emitter Voltage or VCE Max is -45V.Max Operating & Storage Temperature ranges from -65 to +150 degree centigrade.
The features and specifications of the BC557 transistor include the following.
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