Hopefully, the presentation is interesting for its results and is useful as an inspiration. Unlike the normal understanding of an “Instructable”, the focus is not on what was built. In order that this Instructable is not held to a very high scientific standard, it is described as empirical as in " verifiable by observation or experience rather than theory or pure logic”. The point for this Instructable is to show material, methods and outcomes of a venture undertaken with the 2N7000 MOSFET to explore a practical current limit for its application. Where inadvertent contact between the device and the tender forearm elicits “ouch!” and is accompanied by all manner of flying coffee, discrete components, soldering irons and so on. What is the practical current limit for the device in the Arduino arena? Practical could be perhaps defined at the point the workbench burns but a more useful limited seems to be simply “ouch!”.
Nonetheless heat generation/dissipation may be the one question that needs a bit more of an answer before using the MOSFET for the 5V. Of course this view is not likely shared by those involved in circuit design but this traveller finds it quite easy to become bogged down with labels of 'absolute maximum', 'recommended', 'typical' and befuddled even further by the multitude of 'conditions'. The datasheet is undoubtedly a goldmine of information for electronic components but it often seems the numerous pages after the summary and pinout list are somewhat less helpful. Assuming a 20ma current, the 2N7000 should power about ten devices while a digital pin of an ATmega328 (Arduino) shouldn’t be tasked with more than two assuming a 20ma current.Īt this point, the common wisdom is to consult the datasheet. When considering a means to provide 5V VCC for sensors (<20ma) that are sampled once or twice per day the 2N7000 could be a good choice. On a data sheet this MOSFET is shown to be capable of switching 200ma with a 60V rating. MOSFET for voltage controlled small signal switching.
The 2N7000 is a N-Channel Enhancement Mode Field Effect Transistor, a.k.a.
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