The C945 transistor is a NPN bipolar junction transistor (BJT). It is commonly used as a small-signal amplifier or switch in electronic circuits. The "C" in the part number refers to the transistor case style, which is a through-hole package. The "945" may refer to the specific type or characteristics of the transistor. The specific specifications of the transistor such as the current and voltage ratings, hFE(current gain), and other parameters can be found on the datasheet.

The C945 transistor is a general-purpose NPN transistor that can be found in a wide range of commercial and educational electronic circuits. It comes in a TO-93 package, and the maximum load this transistor can drive is roughly 150mA (0.15A), which is sufficient to power several devices in a circuit, such as LEDs, relays, ICs, transistors, and other components. The transistor's saturation value is merely 0.3V, which is another positive attribute of this transistor. In addition, the transistor is a low-noise device with an excellent DC gain of 70 to 700.

C945 is commonly used in electrical circuits that require a high-speed transistor with a low current, which is made up of three semiconductor regions: emitter, base, and collector. The base of the C-945 is doped with positive or P-type semiconducting material because it is a bipolar junction transistor.

 Alternatives for C945
BC546, C1815, KSC945C, 2N2222, 2N3904, 2SC1815, 2SC3198