| General > General Technical Chat |
| Semiconductor Marketing Tips (Through the Use of Misleading Specs) |
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| PartialDischarge:
Tests for analog semiconductors are fishy but power devices specifications (IGBTs, Mosfets...) take the cake |
| Ian.M:
Leave out the DC line on any SOA graph, because even on an actively cooled cooled copper block maintaining Tj of 25° C it blows up at a very small percentage of its front page ratings. |
| niconiconi:
Want to make your product to stand out from the competition with the highest ratings? No problem. Just lower your stress-test standard, say from 300% to 150%, then you can put a higher number on its labels. Don't forget to ask the customers to de-rate them again in the fine prints. |
| PartialDischarge:
--- Quote from: niconiconi on June 07, 2022, 07:36:27 am ---Don't forget to ask the customers to de-rate them again in the fine prints. --- End quote --- Who cares, has *anyone* seen a warranty claim on a semiconductor product made reality? |
| rsjsouza:
--- Quote from: niconiconi on April 12, 2022, 03:24:47 am --- --- Quote from: NiHaoMike on April 12, 2022, 02:49:15 am --- --- Quote from: niconiconi on April 11, 2022, 11:25:11 pm ---4. If your device performance starts degrading seriously beyond a point, just cut off the X-axis early in your graphs before that happens. For example, if the frequency response is really bad beyond 500 MHz, just stop at 450 MHz, so people will never notice this deficiency in the datasheet! --- End quote --- If it's sold as a 450MHz part, what's the problem? Those who rely on how a part behaves "overclocked" should not be surprised if a different batch doesn't work as well as they hoped. Those repairing old equipment (especially audio) sometimes experience the opposite problem: the modern parts perform way better at high frequencies than the original causing the circuit to oscillate. --- End quote --- If the part starts behaving in a rather unexpected manner just beyond a point, the datasheet better to get that documented as a warning. --- End quote --- Well, that does not make much sense to me: where would one stop pushing parameters outside of the designed range to try to get a more complete picture of the behaviour in these conditions? Imagine if, in your example, the part was pushed up to 10% above its designed spec (495MHz)? Out of spec parts are anyone's game. A 50A transistor driving 55A blows up? Should this be published? |
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