Bipolar Transistors
Bipolar Transistors
Bipolar transistors use both electrons and electron holes as charge carriers, allowing a small current injected at one of its terminals to control a much larger current flowing between two other terminals, making the device capable of amplification or switching.
Bipolars have a Base, Collector, Emitter:
Do you see the arrow on the emitter? An easy way to remember which round:
- NPN – Not Pointing iN
- PNP – Pointing iN
These are the very simplest form of the transistor, but are a great place to start, and are easy to get using. If you need help, check out our blog or contact our technical team via email for support.
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Transistor - NPN, 2N3904, Common BJT - TO-92
Sparkfun
£0.75Transistor - NPN, 2N3904, Common BJT - TO-92 These are very common, high-quality BJT NPN transistors.Designed for use as general-purpose amplifiers and switches. The useful dynamic range extends to 100mA as a switch and to 100 MHz as an amplifier...£0.75 -
Transistors - NPN, BC547, Bipolar BJT - TO-92
Sparkfun
£0.32Transistors - NPN, BC547, Bipolar BJT - TO-92 These are high-quality BJT NPN transistors that work well with audio applications, switching and amplifying Specifications: Transistor Polarity: NPN Collector-Emitter Voltage V(br)ceo: 45V Transition...£0.32 -
2N2222A NPN Transistor
Proto-PIC
£1.01A basic NPN transistor,2N2222A 0.8A Ic 10Vce.DocumentsDataSheet£1.01 -
Common BJT Transistor - PNP 2N3906
Sparkfun
£0.12These are very common, high quality BJT, PNP transistors made by ST Micro. Datasheet:£0.12