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I would like to use an arduino device to control a 12V 17W water pump and filter, what type of part to I need that can switch the 12V power on and off?

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    \$\begingroup\$ Types of parts that may be useful for you: a relay, or a bipolar junction transistor operating as a switch, or a MOSFET operating as a switch. \$\endgroup\$ Commented Dec 1, 2012 at 2:42

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If you have only 3.3 or 5V logic high to switch on a 12Vdc motor, You may want to consider short circuit overload, thermal overload and inductive turn off effects. The better FETs with low Ron resistance usually require a bigger gate voltage to perform this. There are some chips which generate this internally using a voltage pump (MOS charge pump cct) to generate this higher internal gate voltage.

Conclusion I recommend the TPS2204 chip, capable of 2A sustained in an 8 pin DIP package.

Additional precautions are given here and buy here for $2 /1pc or $1 /1kpc enter image description here

You can put an Alum.elect. cap. (>=16V) on the output to suppress commutation noise and use twisted pair wire. This driver can handle large capacitance and surge currents.

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