![]() Do not expose it in temperature above +150 centigrade and below -55 centigrade and always use a suitable base resistor. For best performance we suggest to not touch the max load limit always stay under it. To run this transistor safely in a circuit it is suggested to not operate it voltage over 50V, always connect the pins correctly and do not provide it load above 150mA because the max load this transistor can handle is 150mA. It can also be used in RF circuits under 200MHz frequency. The saturation voltage of most BJT transistors are 0.6V but the C945 has only 0.3V therefore it can perform well in low voltage circuits or in any circuit where low base voltage is available and other BJT transistors are not saturating. Moreover the transistor is also low noise device, and has a good DC current gain that is 70 to 700.Īs discussed above the transistor has a good DC current gain and low noise type due to which it is ideal to use in audio preamplifier & audio amplifier circuits stages or amplification of other signals in electronic circuits. The saturation voltage of the transistor is only 0.3V which is also a good feature of this transistor. It is manufactured in TO-93 package, the max load this transistor can drive is around 150mA or 0.15A that is enough to operate many devices in a circuit for example LEDs, Relays, ICs, transistors and other parts of a circuit. Max Storage & Operating temperature Should Be: -55 to +150 CentigradeĢN2222, 2N3904, 2SC1815, 2SC3198 (Pin configuration of SOME transistors are different from C945, check pin configuration before replacing in a circuit)Ĭ945 is a general purpose NPN transistor used in wide variety of commercial and educational electronic circuits.Minimum & Maximum DC Current Gain (h FE): 70 – 700.Max Collector Dissipation (Pc): 400 miliWatt.Max Collector-Emitter Voltage (V CE): 50V.Due to this biasing current, 2N3904 goes to the saturation state and the LED turns ON.Advertisements Features / technical specifications: When the switch is closed, the base of the transistor is biased, and current flows to the base of the transistor. ![]() Due to this, 2N3904 remains in the cut-off state and the LED does not glow. And no current flows to the base of the transistor. 2N3904 Transistor is a popular NPN bipolar junction transistor used in low power and current, medium. When the switch is open, the base of the transistor is not biased. 2N3904 Transistor Pinout, Datasheet, Specs & Equivalent. The required resistor value can be easily calculated using Ohm’s law. Proper biasing of the base ensures adequate base current to turn ON the transistor.Ī resistor of 220 Ohm is connected between the load(LED) and the collector terminal to protect the LED from overcurrent. The base of the transistor is biased using a 10 K Ohm resistor(R3) in parallel to the 1 K Ohm resistor(R2) plus base-emitter junction resistance(in series). The complete circuit is powered via a 5 V supply. ![]() MAXIMUM RATINGS (Values are at TA 25☌ unless otherwise noted. The useful dynamic range extends to 100 mA as a switch and to 100 MHz as an amplifier. And the base is connected to the MCU signal with an appropriate base resistor calculated for the current drawn by the load. The emitter goes to ground, the collector goes to the negative side of the load. In the circuit diagram given above, 2N3904 is used as a switch to turn ON/OFF an LED connected at the collector terminal. 2N3904/D NPN General - Purpose Amplifier 2N3904 Description This device is designed as a generalpurpose amplifier and switch. A 2N3904 is an NPN transistor and used commonly to switch the low side of a load.
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