Derating is not pessimism; it is a budget. The datasheet ratings of a power diode describe a clean, controlled test at 25 C — and the real world adds temperature, transients, lot variation, and duty that the test never included. The derating rules set aside the margin that buys the design against those unknowns. This … Read more
The power semiconductor market in 2026 assembles itself around three demand centers — electric vehicles, solar and storage, and AI data-center compute — and the interesting news is not which of the three grew, but that they now pull on the same component families at the same time. A SiC diode can serve a solar … Read more
Size a bridge rectifier from a DC motor’s nameplate and you will be wrong in the safe direction almost every time — the rectifier will be too big, cost too much, and waste space. Size it from the nameplate and your design will occasionally be catastrophically wrong, because the nameplate current is the running current, … Read more
Measure the forward voltage of a diode with a multimeter and you will get a number; read the same diode’s datasheet and the VF printed there is almost never the number you just measured. Neither reading is wrong — they are answers to different questions. A multimeter exercises the junction at microamps with a short … Read more
A 3.3 V rail that loses 0.7 V to a diode is not losing a rounding error — it is giving up 21% of its voltage before the load even sees it. On a 5 V rail the same diode takes 14%. Those two numbers are why the “just grab any diode” habit stops working … Read more
Ask three people how to size the capacitor after a bridge rectifier and you will hear “1000 µF per amp” from two of them. That rule works well enough in a surprising number of low-power circuits, which is exactly why it survives — and why it is dangerous. A 1 A, 50 Hz full-wave rail … Read more
A Zener datasheet looks shorter than a rectifier datasheet — a few voltage numbers, a current or two, a temperature coefficient — yet it is one of the easiest spec sheets to misread. The nominal voltage is printed with a tolerance, the current used for the test is hidden in the fine print, and the … Read more
A bridge rectifier is four diodes performing one job, which means a single failed junction inside it behaves like a partial failure — the bridge keeps “working,” but the output sags, the ripple changes frequency, and the supply runs hot. The fastest way to catch that partial failure is not to guess by symptoms but … Read more
Every parts drawer has a handful of diodes with no labels, no data sheets, and a reputation for causing problems the moment they go back into a circuit. The question “is this diode bad?” is really a workflow question: how do you decide whether an unmarked part from a drawer is usable, without knowing its … Read more
A Zener shunt regulator is the cheapest voltage regulator you can build — one Zener, one resistor, no active components — and the reason so many of them fail on the bench is that they are designed for the typical case instead of the worst case. The design question is not “what resistor works at … Read more
The IGBT is the power semiconductor that most engineers meet last, and it is also the one whose datasheet reads most like a compromise: a device that switches like a transistor and conducts like a diode, with a voltage rating that demands respect and a switching speed that has a firm ceiling. Understanding the IGBT … Read more
Sizing a transistor to drive a relay coil looks like a two-line exercise — pick a transistor, pick a resistor — and the smoke follows when the worst-case numbers are skipped. A relay coil is an inductor that draws its steady current plus an inrush at pull-in, and the transistor must be saturated across that … Read more
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