Electronics Forum | Wed Nov 03 09:18:27 EST 2004 | Simon UK
Hi Dennis, It is all dependant on what you state for the class of product i.e. Class 3 is the top end acceptance criteria used mainly in Aerospace and Military. You have 2 terms you need to grasp to avoid confusion. 1. Acceptance Criteria 2. Target
Electronics Forum | Wed Nov 03 14:46:29 EST 2004 | dramos1
Hi Russ, Thanks for the reply. In IPC-A-610 Rev. C on section 5.2.9 {Mounting - Connectors] page 5-21 on the manual [January 2000], the acceptable class [1,2,3]listed 3 items. In order for the connector to be accepted, are all 3 items must be met? I
Electronics Forum | Mon Nov 08 17:47:58 EST 2004 | davef
Russ: On "usually get some mask material from our board house. It cures with heat so it works really well in our applications.": We're unsure about the type of mask that you are using, but be careful [we used to do this, also]: * Final cure of the L
Electronics Forum | Tue Nov 09 12:00:41 EST 2004 | Dreamsniper
Problem: PQFP208 Pad Width specified as 11.8 thou, PCB came and they are 9.5 thou. Component Lead Width is 10 thou to 10.6 thou. Operators have difficulty aligning and inspecting. Issue: Fed back to PCB Fab House and they said IPC accepts +/- 20% fo
Electronics Forum | Tue Nov 09 16:24:53 EST 2004 | davef
Your board fabricator is: * Correct that +-20% is the tolerance of the IPC specification * A moroon for not correcting the artwork to compensate for etch factors Find a new supplier. Baring that, if the SMT pad width is critical, you can specify th
Electronics Forum | Tue Nov 16 11:11:18 EST 2004 | iva
Hello Charlie, For Application of thermal conductive glue by dispensing, Luxeon recommends Amicon E3503 from Emerson and Cuming (www.emersoncuming.com) for its standard Luxeon Power Light Sources. For optimal thermal connection it is important that
Electronics Forum | Tue Nov 09 21:10:02 EST 2004 | davef
Some GD saleman [Oops, make that very nice saleman. He took me along for lunch.][Just kidding, all you sales types out there. You know how much I like to put burrs under your saddles. ;-) We kid because we care.] got into the catacombs to wake-up o
Electronics Forum | Wed Nov 10 15:18:15 EST 2004 | Dave G
Let's go for Ugly..... I've used these in the past for attaching connectors to boards and tabbed Transistors to extruded Aluminum heatsinks with mixed results. The concept is great but, in practice there are some headaches to deal with. We've gotten
Electronics Forum | Tue Nov 09 22:43:39 EST 2004 | Fengang
Hi all, Yesterday I met a VCO(Vector-Controlled Oscillator) supplier, who provided the component spec -- peak temperature over 240 centigrade stands 7secs. But this spec is obviously different from our spec -- 260 centigrade 10secs. They told me th
Electronics Forum | Fri Nov 12 10:47:03 EST 2004 | davef
Fengang: You say, "And I have investigated a lot of component manufacturers, it seems like that most of them just change the plating of components' lead for lead free. That means lead free process has little impact on the component manufacturers, is
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