S8550 PNP SILICON TRANSISTOR[Video+FAQ]: Pinout, Circuit, and Equivalents

       S8550 is a PNP transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at the ground and will be closed (Forward biased) when a signal is provided to the base pin. It has a maximum gain value of 300; this value determines the amplification capacity of the transistor normally S8550. Since it is very high it is normally used for amplification purposes.

      When this transistor is fully biassed then it can allow a maximum of 700mA to flow across the collector and emitter. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V­CE) or Collector-Base (VCB) could be 20V and 30V respectively. When the base current is removed the transistor becomes fully off, this stage is called the Cut-off Region.

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S8550 Pin Configurations

• Low Voltage, High Current PNP Transistor

• Continuous Collector current (IC) is 500mA

• Collector-Emitter voltage (VCEO) is -25 V

• Collector-Base voltage (VCB0) is -40V

• Emitter Base Voltage (VBE0) is -5V

• Current Gain (hFE), 85 to 300

• Commonly used as Class B Push-pull transistors

• Available in To-92 Package

• Audio Amplification Circuits

• Class B Amplifiers

• Push-pull Transistors

• Circuits where high gain is required

• Low signal applications

NPN Complementary of S8550 is S8050,

BC527, KSA708, MPS750

BC557, 2N3906, A1015, 2SA1943, BD140

 A simple circuit diagram of the Class B amplifier using the S8050 is shown below.

     S8550 is a general-purpose transistor, therefore, you can use it at the output of your audio amplifier circuits to amplify the output audio signal to 1 watt, for example, it can be used in electronic doorbells circuits, mp3 audio amplifiers and in the output of buzzer circuits, etc. If you want to use it as a switch then you can easily drive big relays, many small LEDs at once, and one or two high-power LEDs around 10 to 20 watts, switching ON another portion or application in an electronic project/circuit, etc. Moreover, it can also be used as an alternative or equivalent to many other general-purpose transistors and it is also an ideal transistor to use in your hobby electronic projects, therefore it is a must to have transistors in your electronics lab.

JCET Group Co., Ltd. is a public company headquartered in Jiangyin on China's eastern coast. It is the largest Outsourced Semiconductor Assembly and Test (OSAT) company in mainland China and the third-largest globally. JCET was formed in 1972 when Jiangyin converted a local factory to produce transistors. JCET went public on the Shanghai Stock Exchange in 2003 and continued to grow over time. JCET provides a range of semiconductor packaging, assembly, manufacturing, and testing products and services.

      Electronics components perform very well in a circuit for a long period of time if all the safety measures are taken into consideration at the time of designing and making the circuit, to make this transistor long run in your electronic application it is recommended to not use it in the circuit above 20V, and do not increase the output load from -700mA, always use a good current limiting resistor at the base of the transistor, and do not use it in the temperature above 150 centigrade and below -65 centigrade.