The 2N7002 is another different part with different resistance, current rating and package.
![]() Complementary PNP Transistors S8550 Alternative NPN Transistors S9014, MPSA42, SS8050, BC547, 2N3904, 2N2369, 2N3055, 2N3904, 2N3906 S8050 Equivalent Transistors 2N5830, S9013 Brief Description on S8050 S8050 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin. It has a maximum gain value of 400; this value determines the amplification capacity of the transistor normally S8050. Since it is very high it is normally used for amplification purposes. However at a normal operating collector current the typical value of gain will be 110. The maximum amount of current that could flow through the Collector pin is 700mA, hence we cannot drive loads that consume more than 700mA using this transistor. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA. When this transistor is fully biased 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 base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region. S8050 in Push-Pull Configuration As mentioned in the features the S8050 transistor is commonly used in push pull configuration with Class B amplifier. A push pull amplifier, commonly known as Class B amplifier is type of multistage amplifier commonly used for audio amplification of loudspeakers. It is very simple to construct and requires two identical complimentary transistors operate. By complimentary it means that we need a NPN transistor and its equivalent PNP transistor. Like here the NPN transistor will be S8050 and its equivalent PNP transistor will be S8550. A simple circuit diagram of the Class B amplifier with the using the S8050 is shown below. Applications Audio Amplification Circuits Class B Amplifiers Push pull Transistors Circuits where high gain is required Low signal applications 2D model of the component If you are designing a PCB or Perf board with this component then the following picture from the S8050 transistor Datasheet will be useful to know its package type and dimensions. ![]() The symbol doesnt always show the internal diode formed between the substrate and the sourcedrainchannel. Electronic symbol The 2N7000 is housed in a TO92 package, with lead 1 connected as the source, lead 2 as the gate, and lead 3 as the drain. The 2N7002 variant is packaged in a TO-236 surface-mount package. The 2N7000 and BS170 are two different N-channel, enhancement-modeMOSFETs used for low-power switching applications, with different lead arrangements and current ratings. They are sometimes listed together on the same datasheet with other variants 2N7002, VQ1000J, and VQ1000P. The 2N7000 is a widely available and popular part, often recommended as useful and common components to have around for hobbyist use. The BS250P is a good p-channel analog of the 2N7000. Packaged in a TO-92 enclosure, both the 2N7000 and BS170 are 60 V devices. The BS170 can switch 500 mA, with a maximum on-resistance of 5 at 10 V Vgs.
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