BC108 Transistor: Pinout, Datasheet, and Equivalent

BC108 Pinout

BC108 Symbol

BC108 Footprint

The BC108 is a semiconductor device that can be used to amplify, switch, or power signals. Because the BC108 is an NPN transistor, we must first apply a little amount of positive voltage to the transistor's base, after which only the needed amount of current flows through the base.

• Bi-Polar NPN Transistor

• DC Current Gain (hFE) is 900 maximum

• Continuous Collector current (IC) is 200mA

• Emitter Base Voltage (VBE) is 5V

• Base Current(IB) is 10mA maximum

• Available in TO-18 Metal Can Package

• Maximum Collector-Base Voltage |Vcb|: 30 V’

• Collector Dissipation: 0.3 W

• Transition Frequency:150 MHz

• Operating Junction Temperature Max (Tj): 175 °C

• Noise Figure – 2 dB

• Operating and Storage Junction Temperature Range -65 to +175 °C

• Collector Capacitance 5pF

• LED dimmers or flashers

• Switching Applications

• Preamplifier for Power Amplifier

• High-frequency switching

• Modulator and Demodulator for RF frequency

The equivalent for BC108:

BC547

BC548

BC549

2n3904

BC107

2N2222

2N3053

2N2907

BC177B

A junction transistor is basically a sandwiched construction between two layers of N-type material of P-type material. The BC108 transistor is a general-purpose N-P-N transistor. Transistors are classified into two groups based on their construction: NPN transistors and PNP transistors, as shown below.

NPN transistor & PNP transistor

Electrons are the primary charge carriers of an NPN transistor, and they are emitted from the transistor's emitter to the PN junction. When a positive voltage is given to the base, holes are produced in the base, causing them to migrate to the emitter junction. This process thins down the depletion zone of the PN junction, allowing more electrons to flow into the collector.

Transistors, unlike MOSFETs, are current-controlled devices that may be turned on or off by delivering the required base current (for BC180 transistor it is 2mA). The BC550 is an NPN transistor, which means it will remain open while no current is provided to its base, but will flip on when a base voltage is applied. The following simulated circuit shows how this transistor operates when the base current is applied and when the base current is not applied.

BC108 Application Circuit

When we switch on the transistor by giving the requisite current to its base, it will stay on until the voltage at the transistor's base approaches zero. The transistor's base cannot be left floating because this could cause false triggering, which could cause problems in the circuit. To remedy this problem, we must employ pulldown resistors; for example, in the example above, a 10K resistor is used to pull down the transistor's base.

Central Semiconductor Corp BC108B PBFREE technical specifications, attributes, parameters and parts with similar specifications to Central Semiconductor Corp BC108B PBFREE.

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