Re: Strength of CD4000 substrate diodes

On Fri, 08 Dec 2006 16:25:05 +0100, Fred Bartoli
<fred._canxxxel_this_bartoli@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

Jim Thompson a écrit :
On Fri, 08 Dec 2006 04:35:12 GMT, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:

Winfield Hill wrote:

[snip]

I imagine all modern parts can take at least 20mA, or more, whatever
spec they might put out. It's easy to test representative production
parts to test reality... SCR supply breakdown is easy to observe.
A limiting resistor can protect your test sample for further analysis.


Yes, Win, I did such tests a while ago. They could stomach more than
20mA.
[snip]

Well? It looks like you can "get away with it" ;-)

Nevermind that, on a harvest moon, a cold damp night, an owl buzzes
your head, and it blows all to hell ;-)

Do it right!


At least, if you can't make them change their mind about making it
right, I'd ask them to sign that:
* you don't advocate doing such a thing, but you've done it to their
express request.
* Then write that it's possible to anticipate (but not to guarantee) the
behavior of parts through incoming sample testing *you* do (and be paid
for) of *each* different lot, but since they insist on doing it wrong,
you can't be held responsible for any consequences. Then maybe list some
and put some estimated $figures.

I've found this kind of *big* 'warning' enough to change even the most
reluctant minds.

It's been a while, but I have done just that... "I won't sign off on
it".

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
.