![]() ![]() When this transistor is fully biased then it can allow a maximum of 100mA to flow across the collector and emitter. To bias a transistor, we have to supply current to base pin, this current (I B) should be limited to 5mA. The maximum amount of current that could flow through the Collector pin is 100mA, hence we cannot connect loads that consume more than 100mA using this transistor. This is where a PNP transistor differs from a NPN transistor, a Logic state (blue colour) is used to toggle between Ground and Signal Voltage (Emitter-Base Voltage V BE) as shown belowīC557 has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. ![]() Note: Complete Technical Details can be found at the BC557 datasheet given at the end of this page.īC157, BC558, 2N3906, 2SA1943, BD140, S8550, TIP127, TIP42īC557 is a PNP transistor hence the collector and emitter will be closed (Forward biased) when the base pin is held at ground and will be opened (Reverse biased) when a signal is provided to base pin. Continuous Collector current (I C) is 100mA. ![]()
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