BC556B Transistor: TO-92 PNP Transistor, Datasheet and Equivalents

BC556B is a TO-92 packaging bipolar junction transistor with a wide range of applications. It can be employed in a number of general switching and amplification applications in electrical circuits due to its general-purpose properties. Because the transistor's collector-emitter voltage is -65V, it can drive loads up to -65V DC with a maximum current of 100mA.

With a collector dissipation  (Pc) of 500mW and a DC current gain of 110 to 800, this transistor can be used for a wide range of general signal amplification and audio pre-amplification applications.

The BC556B is housed in a TO-92 plastic container. The three leads emerging from the transistor are the collector, base, and emitter leads, from left to right, when looking at the flat side with the leads oriented downward.

The pin diagram for this transistor can be seen in the image below.

BC556B Pinout

BC556B Symbol

BC556B Footprint

BC556B 3D Model

• Material of Transistor: Si

• Polarity: PNP

• Maximum Collector Power Dissipation (Pc): 0.5 W

• Maximum Collector-Base Voltage  |Vcb|: 80 V

• Maximum Collector-Emitter Voltage  |Vce|: 65 V

• Maximum Emitter-Base Voltage  |Veb|: 5 V

• Maximum Collector Current |Ic max|: 0.1 A

• Max. Operating  Junction Temperature  (Tj): 150 °C

• Transition Frequency (ft): 150 MHz

• Collector Capacitance (Cc): 8 pF

• Forward Current Transfer Ratio (hFE), MIN: 240

• Noise Figure, dB: -

• Package: TO92 

• BC556B Transistor  Equivalent Substitute - Cross-Reference Search

• Preamplifier

• General-purpose audio amplifier 

• General Signal amplification 

• PNP Darlington pair

• Drive Load under 100mA

• Used in different driver modules such as LED driver, relay driver, etc.

• Used in amplifier modules such as signal amplifiers, audio amplifiers, etc.

• Used for switching & amplification  purposes

• Used for controlling the motor.

• Used for buffering the impedance

• Used in different projects based on instrumentation and robotics

BC550B, BC550BP, BC550C, BC550CP, BC551, BC556, BC556A, BC556AP  , TIP122, BC556B  P, BC556VI, BC557, BC557A, BC557AP, BC557B, BC557BP, BC557C

Because the BC556B  is a general-purpose device, it can be utilized in a wide range of general electronic applications, such as as a preamplifier or in the preamplifier stages of electronic circuits. It can also be used as an audio amplifier or in the stages of an audio amplifier circuit, as well as for any form of general signal amplification.

On the other hand, it can be used as a switch to drive loads that draw less than 100 milliamps. The 100mA collector current is sufficient to power small loads in electronic circuits such as relays, LEDs, high-power transistors, and a variety of other components. This transistor can also be utilized at the output of microcontrollers because of the -5V emitter-base voltage.

It is recommended that you do not drive a load greater than 100mA at -45V DC  with this transistor that you always check pin configuration before placing it in the circuit, that you use a suitable base resistor for the transistor and that you do not operate or store the transistor at temperatures below -65 centigrade and above +150 centigrade.

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