The useful question about any component family is not what its name means but what the parts in it are specified to do. That answer lives in two documents — the family’s product page for its intended application, and its datasheet for the member ratings — and both are more reliable than any summary written … Read more
On-resistance is the toll a MOSFET charges on every amp that passes through it, and in a battery-powered product that toll is paid out of the battery. The size of the toll depends on two conditions the datasheet states and that beginners routinely ignore: the gate voltage and the junction temperature. Battery life is a … Read more
Four questions answer most first-project selections, and three of them are about the circuit rather than the part. Answer those before opening a catalogue and the choice usually narrows to a handful of candidates that are all capable of doing the job. Four questions before you open a catalogue What voltage must the device block, … Read more
For a beginner wiring exercise, identify the source reference and the load connection before choosing an N-channel or P-channel MOSFET. The gate must be driven relative to its own source. Performance, voltage, loss, and driver requirements still matter when selecting the actual part. Last updated: October 16, 2026 Two polarities in one picture An n-channel … Read more
A MOSFET is a switch that is operated by a voltage rather than by a finger, and the reason it matters is the ratio involved: a signal you can barely measure can control a current large enough to burn you. Nearly every modern device that moves power or drives a motor contains several of them. … Read more
The letters at the start of a component part number almost always identify the manufacturer or the product family, and they carry no rating information at all. Everything useful sits later in the string, and the only reliable way to read it is the ordering table in the current datasheet for that specific family. Why … Read more
A series code is a shelf label rather than a specification, and the practical question a buyer needs answered is which shelf holds parts that suit their circuit. That answer comes from two documents — the family’s product page and its datasheet — and both are more useful than any summary written about them. The … Read more
Most beginner wiring mistakes with a MOSFET come from one misunderstanding: the gate voltage is measured between the gate and the source, not between the gate and the circuit’s ground. Once that rule is clear, the three terminal names stop being arbitrary and start predicting what a circuit will do. Last updated: October 11, 2026 … Read more
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