Electronics Forum | Wed Feb 26 17:05:42 EST 2003 | davef
Q1: Are the markings on resistors the actual value? A1: Generally, resistor marking indicates the value of the device, where the first two digits are the value and the third digit is the multiplier. Q2: Do AOI machines look for these markings or do
Electronics Forum | Tue Feb 04 18:46:01 EST 2003 | slthomas
"Use the pad mating to lead wetting area." If I get your drift, we're talking about the minimum lead area (assuming the pad has an area that's at least as large as the lead) required to be wetted by IPC-610. Hmmmm...that would take some calculation
Electronics Forum | Mon Feb 03 22:48:00 EST 2003 | vinesh
Hi all, We are using small CSPs (10x10mm) in one of our products which has a big ground pad in the center (7x7mm). The maximum voiding allowed on this big pad is also no greater than 25% which we are finding very hard to achieve. The centre pad ha
Electronics Forum | Mon Mar 03 05:35:21 EST 2003 | Kelly
We just had this issue a couple months ago with a single sided FR-4 board which was scored. We found that the design was a factor but also the depth of the v-score. Since then we have re-designed the part further away from the score line. At the same
Electronics Forum | Fri Feb 14 17:25:17 EST 2003 | mikeo
Hello, As an Ex-Sanyo engineer I agree with the previous reply. Use EP1 sparingly. You may find that the nozzle sleeves are scored when you remove them. This is from lack of cleaning. You can only buy the sleeve and bearing from sanyo which is a was
Electronics Forum | Wed Feb 05 13:08:20 EST 2003 | joeherz
You're correct that a thicker solder deposit will make bridging on fine pitch devices a bigger risk. Another alternative could be to slightly over-print the pads (onto the soldermask) ala pin-in-paste process. Basically adding enough solder to fill
Electronics Forum | Thu Feb 06 09:53:38 EST 2003 | genny
Actually, the most common reason I have seen vias in pads is for grounds in RF applications where the frequencies are high enough that you need a ground RIGHT THERE!... not .1" away. Vias and traces have RF properties of capacitance and inductance,
Electronics Forum | Thu Feb 06 14:47:50 EST 2003 | MA/NY DDave
Hi "some customers/designers want to have via holes to be present in the PCB pad, due to some belief that it helps in heat dissipation. " As I think about this I don't know exactly why they would be concerned. I can imagine in some exotic products
Electronics Forum | Mon Feb 10 21:30:48 EST 2003 | MA/NY DDave
Hi You are probably right. The only thing I will tell you is that one time as thee DFM engineer working between many electronic designers, component manufacturers and CEMs (contract electronic manufacturers) the component manufacturer would not bud
Electronics Forum | Fri Feb 07 16:36:30 EST 2003 | jonfox
About as good as you are going to get for a general (broad) package download is from the two dummy component companies listed. If you want something better and corresponds to the parts that you are using (not dummy parts) download the data sheets fo
