Why is that? The power between the emitter and collector can easily be higher than the base. Likewise, you may also be familiar with the terms transistor and amplifier in one sentence. Often, triggering the base current allows the emitter and collector to connect, thereby forming a switching element. In technical terms, we have the input as emitter, the output as a collector, and the control line as the base. In a nutshell, it is an electrically controlled switch.įor this specific switch to work, it requires input, output, and a control line.
547 transistor driver#
It is especially crucial if you’ll be working with driver modules, amplifier modules, or Darlington pairs. So, are you ready to learn more about these fascinating electronic components? Let’s get started! What Is A Transistor?īefore we jump into what a BC547 transistor is, let’s cover what a transistor is. The BC547 is a necessary transistor to know and understand as a switch or an amplifier. Are you interested in learning more about the topic? You’ve come to the right place! Here, we will be discussing all that there is to know about the BC547 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.If you’re an electric enthusiast, the chances are that you’ll come across a BC547 in one way another.
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. 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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