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Old 19th January 2010, 03:16 PM   #11
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uncle,
you are complicating this unnecessarily. Visual inspection and crack-up are the best way to go.
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Old 19th January 2010, 03:23 PM   #12
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By "crack-up" do you mean vise or hammer? Because that's what I would do.
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Old 19th January 2010, 04:09 PM   #13
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Right, then you will know for sure.
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Old 19th January 2010, 04:30 PM   #14
wg_ski is offline wg_ski  United States
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Quote:
Originally Posted by Lumba Ogir View Post
uncle,
you are complicating this unnecessarily. Visual inspection and crack-up are the best way to go.
"Break one open and look inside" may not fly with the ISO9000 auditors or the bean counters.
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Old 19th January 2010, 04:34 PM   #15
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Originally Posted by wg_ski View Post
"Break one open and look inside" may not fly with the ISO9000 auditors or the bean counters.
Tell them fine, you'll do it once they come back shorted.
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Old 19th January 2010, 11:26 PM   #16
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actually, the companies that do this for a living use X-ray machines.... i do know a doctor or two that have one...
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Old 20th January 2010, 12:28 AM   #17
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I don't know if you can turn a medical x-ray source up high enough to punch through a good layer of copper. Maybe you could set the pulse duration to maximum and try multiple exposures. It seems like the cost of one crumbled transistor from an order-full would be worth it.
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Old 20th January 2010, 01:54 AM   #18
wg_ski is offline wg_ski  United States
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The FA place we use sells X-ray machine time at $100 or so an hour, after hours. The X-ray will go right though copper - the harder alloys like Cu-W, not so much.

Whether the cost of one sacrificed transistor is worth it or not depends on how many you're ordering and how rare they are. For current production parts in 100 piece lots no problem. They're not likely to be fake anyway, and checking one isn't an issue. But if you're using obsolete devices that you obtain a few at a time, and can only get them from questionable sources it's another matter. Just when you need to the most you can't afford to bust it open. And whether or not your QA policy will allow it.....
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Old 20th January 2010, 02:12 AM   #19
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Hi,
it is wise to be cautious and suspicious about low prices these days, Sanken devices are usually not cheap.
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