#547 transistor driver
#547 transistor series

This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (VCE) or Base-Emitter (VBE) could be 200 and 900 mV respectively. 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 (IB) 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. BC547 has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. If you are designing a PCD or Perf board with this component, then the following picture from the BC557 Datasheet will be useful to know its package type and dimensions.BC547 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin.

Amplifier modules like Audio amplifiers, signal Amplifier etc.

#547 transistor driver

Driver Modules like Relay Driver, LED driver etc.When uses as an Amplifier the DC current gain of the Transistor can be calculated by using the below formulae DC Current Gain = Collector Current (I C) / Base Current (I B) Of the above types common emitter type is the popular and mostly used configuration. Some of the configurations used in amplifier circuits are

It can amplify power, voltage and current at different configurations. Depending on the voltage applied at Base Terminal, BC547 can operate in two states, named: Forward Biased. BC547 Pins (Terminals) from left to right are called: Collector. The value of I B should not exceed mA.Ī Transistor acts as an Amplifier when operating in Active Region. BC547 is a 3-Terminal NPN Bipolar Junction Transistor (BJT), mostly used for switching purposes and current amplification. Where, the value of V BE should be 5V for BC557 and the Base current (I B depends on the Collector current (I C). The value of this resistor (R B) can be calculated using below formulae.

#547 transistor series

Anything more than 5mA will kill the Transistor hence a resistor is always added in series with base pin. As mentioned the biasing current should maximum of 5mA. As discussed a transistor will act as an Open switch during Forward Bias and as a Closed switch during Reverse Bias, this biasing can be achieved by supplying the required amount of current to the base pin. When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region as explained above. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around 660 mV. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V CE) or Base-Emitter (V BE) could be 200 and 900 mV respectively. To bias a transistor, we have to supply current to base pin, this current (I B) should be limited to 5mA.

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.