2N MPS 2N MPS 2N MPS SILICON. NPN TRANSISTORS. DESCRIPTION: The CENTRAL SEMICONDUCTOR 2N 2N NPN General Purpose Amplifier. This device is designed for use as general purpose amplifiers and switches requiring collector currents to mA. 2N Transistor Datasheet pdf, 2N Equivalent. Parameters and Characteristics.
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Interfacing medium-power loads with an arduino
Find out how much current your load requires. This can be easily found from the data sheet by reading it! Connecting a multimeter set to amps in series with the positive end of the power supply and positive end of the pump with a clamp diode to reduce the effects of induced current when the power is switched off the meter showed the pump drawing 0.
Knowing the load current is much higher than the 20mA the arduino can sink from one of the digital outputs I know I need an transistor that can handle at least mA of collector current. I initially decided to use the BFY51 as it can cope with the demands. I wired the circuit and it worked, but not quite as expected the transistor was getting really quite hot after a few seconds — I checked the wiring again it was all fine so what was going on?
This is where all the heat was coming from the transitor was on,working in its liner mode but not saturated.
2N Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
I tried another BFY51 as they were manufactured in and have been reused in various projects. Same effect — weird. Next step I checked the input circuit and there was the problem. I was using a 6V battery and it was on its way out — under load it was reading 3. Once the battery was replaced all was perfect — a nice cool transistor and a fully operational pump!
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