Exploding Rectifier Diodes ranks high among the questions found in forms related to restoring test equipment. Vishay’s diode family, made up of the ES1A, ES1B, ES1C and ES1D, provide a nice workaround for the problem. To understand, let us recapitulate. When a diode is switched “off”, the current initially flows the other way while separating the pn junction. Once this separation has taken place, the diode is “locked” – sadly, quite a bit of power can be dissipated during the switch-off process. Engineers seeking a recapitulation are advised to look at MicroSemi’s application note found by Clicking Here – it also sourced the figure included here.
…a faster reverse recovery time means less current “burn”
The theoretic recovery time in the range of 15ns would lead to an allowed maximum frequency of 66.7 MHz – while this, of course, is much too high, parts working with a 400KhZ or a 1MhZ switching frequency do not need to worry when a Vishay ES1B-E3/61T is in place. The forward current of up to 1A should also be enough for most smaller systems – as things get bigger, different diode families need to be used.
From a technical point of view, the four diode families mainly differ in the amount of reverse voltage they can stand. Our table compares the four candidates – if ES1A vs ES1D is your question, look no further.
This table compares the various members of the diode family…
Deploying the ES1C in a PCB is made easy by its SMA (DO-214AC) case, which can be handled by pick-and-place machines effortlessly. It can, however, also be soldered by hand reasonably well.