Probably a good policy. Isn't Vgsmax +/-20V something of a standard? ...Jim Thompson
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| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
It's an interesting philosophical issue, whether to approach or exceed abs max ratings. A similar problem is whether to use measured values in a design, like gate leakage, or use the specified limits, which could easily be 10,000 times worse.
We exceed abs max sometimes when the actual parts seem to have margin, and when performance substantially benefits. Some people never do.
We use some schottky diodes at 2x their rated max reverse voltage. And we sometimes run resistors at several times their rated power. But only as tested, calculated risks, often only one critical part in a product.
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John Larkin Highland Technology, Inc
picosecond timing precision measurement
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
I've reversed biased several (10-20) visible leds. most of 'em didn't go till they were above 100V. The ~25 V ones were/are interesting... very inefficient single photon detectors. There are some IR one's that go at ~10 V and are also photo sensitive.
I think if something is important, then you better measure it (at least twice*) to be sure. And you should always try and blow things up.. push 'em to the limit. See where things melt and the smoke comes out. otherwise how do you know where the weak link is? (Not all my coworkers agree with me.)
I take "absolute limits" as good guide's, but not always so absolute. (I have this "36V opamp" that is powered from 48V (with regulators) but I was worried about what would happen if the regulators were shorted by students. I wanted to give them schematics and let them change things. I tested a bunch of opamps to ~50 V and they were all fine... (I think it was you who encouraged me to push 'em higher.)
George H.
twice because one of Murphy's laws is that every prototype has one golden part.
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