bc547 transistor datasheet

Bc547 transistor is a 3 terminal bipolar junction transistor .it is mainly used for hobbyist circuits. Because this transistor has very cheap and widely available.

Bc547 pin configuration

Bc547 pin configuration
Bc547 pin configuration

The bc547 transistor is a 3 pin component. The first pin is called the collector, the second pins are the base and the third pin is the emitter.

The collector pin has the current entering point.

The base controls the flow of current through.

Current Drains out through emitter

Pin Number Pin Name
1 Collector
2 Base
3 Emitter


BC547 Features

  • Bi-Polar NPN Transistor
  • Continuous Collector current (IC) is 100mA
  • Base Current(IB) is 5mA maximum
  • Available in To-92 Package
  • Max Collector-Emitter Voltage (VCE): 45V
  • Max Collector-Base Voltage (VCB): 50V
  • Max Emitter-Base Voltage (VEBO): 6V
  • Max Collector Dissipation (Pc): 500 milliwatt
  • Max Transition Frequency (fT): 300 MHz
  • Minimum & Maximum DC Current Gain (hFE): 110 to 800
  • Max Storage & Operating temperature Should Be: -65 to +150 Centigrade
  • Low Noise: 2-10 dB 

Bc547 explanation

bc547 transistor is using too many different circuits.so you need to understand the all features and parameters.

the gain of the bc547 transistor is 110 to 800 and it has available in 3 versions.




the gain of these 3 transistors is different. the gain of the bc547a is 110 to 220, a gain of bc547b is 200 to 450 and the gain of bc547 is 420 to 800.

the maximum collector current is 100ma, so it not suitable for more than 100ma load.

the base biasing current of bc547 is 5 ma. you need to activate this transistor, just apply 5ma current into the base pin.

Bc547 Package

Bc547 Package
Bc547 Package

package details are required for the PCB design process. so we need to understand the components packages for creating a PCB board.

the package of bc547 is TO-92. this package needs only a small space and low expanse.

the TO-92 packages are mainly used on low voltage and low current applications.

TO-92 transistor



Bc547 SMD

Bc547 SMD
Bc547 SMD

today all electronic equipment is using 90% of SMD components. because it is inexpensive and small size.

features are the same as the first one.

Bc547 Smd packages

SMD package is defined as alphabet and numbers. this coding system is used to identify the size and pinout of the transistor.

bc547 has 2 or 3 different packages are available.

SOT23, SOT323, SOT416, SOT883

bc547 SMD pinout

bc547 has 2 different types of pinout is available.

SOT23, SOT323, SOT416

bc547 SMD pinout
bc547 SMD pinout
  1. base
  2. emitter
  3. collector


bc547 SMD sot883 pinout
bc547 SMD sot883 pinout
  1. base
  2. emitter
  3. collector

Application of bc547 transistor

  • Transistor Darlington Pairs
  • Load Drivers
  • Audio Amplifiers
  • Quick switching
  • Pulse Width Modulation
  • BC547 as Amplifier
  • BC547 as Switch


BC547 as Amplifier

sometimes our designed circuit signals are very weak, so need for amplification. At that time we are adding a single transistor amplifier circuit.

three modes of amplifier circuits are available

  • Common emitter amplifier
  • Common collector amplifier
  • Common base amplifier

common emitter configuration is a popular one and it is commonly used for all circuits. because it has more efficiency and advantages.

in the below, I have added a small circuit for understanding the transistor amplifier concept.

BC547 as Amplifier
BC547 as Amplifier

this is the basic amplifier circuit using bc547, you can make this circuit at your home and listening music. this circuit has only 3 components.

c1 capacitor used to block unwanted dc signal from the input audio. r1 resistor is a feedback resistor.


BC547 as Switch

this transistor used switch circuit is very simple but it has different types of applications.

this circuit has configured as common emitter mode and the base pin is used to control the transistor. the transistor is off stage, the base pin voltage is zero.

so if you need to ON the transistor, just apply  some voltage into the base pin

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