However this transistor is outdated and will not be easily available if you are in Asian or European countries. A better alternative for switching applications will be 2N2222. It can switch loads upto 50V but has a very low collector current rating of only 150mA so this transistor is not really a good choice to be used as a switch. When used as a switch it can easily by controlled by a MCU/MPU since it has a base voltage of only 5V. It is also used as oscillators with is complementary A733 PNP transistor. Hence it was widely used in amplifier applications for pre-amplifying purpose, in high frequency circuits. 3 Pieces TIP120 Power Darlington Transistors.
#2N3904 PINOUT DOWNLOAD#
It has a decent gain value (hfe) of maximum 700 and is highly linear. Given below is the datasheet of the TIP120 transistor in the T0-220 package: Download datasheet from here. For example, if you want to switch a load in an electronic application that requires current under 200mA, this transistor will work well. The C945 is an age old Japanese Bipolar audio frequency NPN transistor. 2N3904 can be used in any electronic application that falls within its electrical characteristics. Normally during such replacements heat shrink tubes are used to cross over the Base and Collector pins without them getting into contact. But for European transistors like BC546 the order will be as Emitter, Base and Collector. If we provide ground to the base pin, then the transistor will be in reverse biased and said to be turn ON. In PNP transistor, by default it’s in ON state, but not to be said perfectly on until the base pin is not grounded. Warning: The C945 is a Japanese NPN transistor and hence the C945 pinout will be in Emitter, Collector, Base order. When use as a switch, can be operated in saturation region and cut-off region.
Current Drains out through emitter, normally connected to groundĬurrent flows in through collector, normally connected to loadĬontrols the biasing of transistor, Used to turn ON or OFF the transistor
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