double sided pcb

"double sided pcb" search results in the Electronics Forums



12781 result s found for "double sided pcb" in the Electronics Forums

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PCB Supports

Jun 10, 2004 | PCB Supports Guy,s I do not have Red-e-set, but Grid-lok offers a fully automatic system that easily installs onto the printers and P&P. It can be set to your board instantly by pressing one button or triggered by the printer to set for each consecutive PCB. They will usually let you try a system at no cost

Pressure check for SMT machine placement.

Apr 12, 2004 | Hi Eric, Every mounter have a standard count and "release" off the component. The sample and cost saving way is to use the paper (e.g: 4mil,5mil...thick) to measure. Just place on the PCB with supoort base below and release the nozzle step by step until it reach the PCB, after that put

Why soldering in SMT called as reflow.

Mar 20, 2004 | is done first using printed adhessive on the board before chip mounting but this time the adhessive were placed not on the pcb pad but in between where the body of the components will land. Solder connections of the chip components to the pcb will occur at the wave solder process after thru hole mounting.

Need help on PCBA Cleanliness Standards and Specs

Dec 2, 2003 | Dear Tom, As manufacturer of solder chemicals for the electronic industry we know we can help you out with your problem. To go no clean you most only organise that the chemistry that stays behind on yr PCB will not cause any problem during the life of the PCB.When you want to clean those residues

High temp PCB material

Aug 29, 2003 | High temp PCB material Can anyone help? We need a PCB material capable of working at 200 deg C, we are currently using Norplex P95 but we are being stung with huge minimum order quantites as we are in the uk and all the manufacturers have to buy it in on special order. Does anyone know of another material with similar

BGA Bowing on the corners.

Aug 25, 2003 | results. I prefer a ramp of 2 degrees C. per 3 seconds. Check out: http://www.pcb-repair.com/

Alternative PCB Test and Repair Cost Model

Jun 24, 2003 | Alternative PCB Test and Repair Cost Model It is evident that the SMT process affects the results at testing, hence I thought this was relevant to this forum. An alternative to the NEMI (National Electronics Manufacturing Initiative) PCB test cost model (see

low volume /semi-automatic solutions

Jun 17, 2003 | Hello Jipp. Before I recomend something, can you send to me a picture of the PCB (Bare board) and one picture with the PCB with components, I could help you.

Sn plated

Apr 16, 2003 | Hi Dave, thanks! The peak temp on the terminal device is about 210C. Some more questions: The soldering part of the terminal is about the same size as the PCB pad. We observe a lot of voids when we remove the terminal device, whice can be removed very easily. Both PCB pad finish and terminal

SMT process Blowhole/ Pinhole

Mar 29, 2003 | Yep, only the MLF have this blowhole/pinhole issue. Other components like SOT(transistor), CAP, RES are hey-o-kie. Btw, MLF = micro lead frame (IC/LGA) package. looks like a BGA without the solder balls. has direct attachment to the PCB ENIG pads with paste deposit in between the PCB and MLF

PCB Bake

Mar 5, 2003 | PCB Bake not have Customer complaints that involve PCB level issues, either OBD or latent field failures, so I think that's at least a pretty good subjective measure. MR

Ceramic capacitors cracking

Feb 5, 2003 | If you are facing problem of craked capacitor only after breaking of the panel into individual PCB's, this may be due to stress being generated on the capacitors terminals. The stress may be due excess pressure being applied on the panel for breaking, which in turn may be due to insufficient depth of the V-score line. In this case you just ask your PCB manufacturer to in craese the depth of V-score line. It will make the breaking easier. There is no need for buying any depannling machine for this purpose only. No body is today using depannling machines. Rajinder Sharma

Wet PCB Assemblies

Jan 19, 2003 | Wet PCB Assemblies For laminated FR4 PCB, we bake between 6 and 24 hours at 100�C. [Search for other bake recipes in the fine SMTnet Archives.] Alot of the determination of baking time is a function of: * Amount of moisture absorbed. * Amount of moisture you need to remove for down stream operations. * Amount

Lattice Orca heatsink to PCB

Dec 19, 2002 | Lattice Orca heatsink to PCB Does any one have any experince with heatsinking a 240 lead QFP such as the Lattice Orca to the PCB? I have a customer who would like to know how this might be done. We are thinking of using some solder paste under the center of the part, or using some sort of a heat conductive pad under the part

Selective soldering pallets and solder balls

Dec 5, 2002 | Have you check the flux gravity lately? If not, Check the flux gravity every 6 hours to make sure proper parameters are meet. Here is a list of things that may cause your solder ball problems; Excecive heat, defective fixtures, preheating temperatures are too high, moisture entrapped on your PCB 's when it was fabricated, conveyor speed too fast, and or contaminated flux. Try to narrow this problems above, and you may have the solution. If the PCB's solder mask is improperly cured this causes blow holes splattering solder balls all over the areas.

Bare PCB baking

Nov 19, 2002 | Bare PCB baking Hi Experts out there, pls help me with the following matters. How important is the bare PCB baking ? What is the temperature for baking @ what RH ? What would be the impact for the ENTEK finished board should the baking is really necessary ? For the board that is to be reworked, what

PCB Pad lifted - repair

Nov 14, 2002 | PCB Pad lifted - repair Hi As DaveF suggested I would contact a shop that has done repair. You should have the PCB/PWB Print and laminate information with you when you make the call. Ask the repair shops if they have continual experience with the Rogers Material you are using. I could give you adhesive manufacturer

PCB Pad lifted - repair

Nov 13, 2002 | PCB Pad lifted - repair Hi All, I am producing a lot of high cost PCBA where the pCB material is the `ROGER' material. Due to some of the high components and handling we get pad lifted issues sometimes and as of now are unable to do repairs on these. Please help if anybody has done such repairs. what kind of adhesives

Paste / Flux during rework?

Aug 9, 2002 | Just started doing BGA rework. After the removal of the "old" component and after site cleaning/component reballing I am ready to install the component on the PCB. It is recommended to apply flux or paste to the board/component. I would appreciate more information on why paste is used over flux and vise versa. What are the advanteages of one over the other? Is it correct to consider that BGA rework follows the same principles as hand rework/soldering and simulation of reflow oven environment. Also, is it better to apply paste/flux to the PCB or the component? thanks sam

PCb vacuum seal puncture

Jul 18, 2002 | PCb vacuum seal puncture Experts, Today I received PCB in a punctured vacuum seal bag. the Humidity indicator change the colour to pink at 60%RH mark. The brd finish is Entek. Earlier our intention to get the board vacuum seal is because we want to ensure that the is no friction in between the 2 entek surface which could

PCB baking for rework

Jul 16, 2002 | PCB baking for rework What is a typical time/temp baking cycle for an assembly prior to BGA rework? This bake is intended to prohibit PCB or nearby component damage as well as protect the component being removed for reball. A 24 hr bake at 125C would be great, but often there are mechanical items installed on the PCBA

SMD land patterns design for wave soldering

Jul 3, 2002 | I' designing a PCB with SMD components to optimize the land patterns for wave soldering. I find that the IPC-SM-782 land patterns are not robust enough for wave soldering, yielding ramdom skips and bridges. This PCB will also give me insight on shadowing effects and what distances should

Immersion Ag

May 13, 2002 | Are you refering to MacDermid Sterling Silver finish or immersion silver in general. We have had enquiries about Sterling Silver from a customer and the blurb I have read looks very good (don't most sales literature). Has anyone tried this finish? One of our main PCB suppliers, who has allegedly trialed SS says that after a couple of reflows the PCB becomes very tarnished. Is this true? Or is it their excuse for not wanting to use this silver variant? ('cos they have one of their own, that they don't have to license) Any tales/experience of Sterling Silver would be appreciated. Ian

Immersion Ag

May 7, 2002 | Hi mate, checked with one of our egg-brains in the factory (freakin' workaholic still around at this time of night), he tells me that Ag-based PCB finishings share rather similar reflow temperatures for normal Sn/Pb applications. this means (if he is right) that at 183 deg-C your NC paste should have normal solder fusion to the immersion Ag PCB pads. do know that no matter what, the BGA reflow peak temperature should ideally be 225 deg-C for the profile. You might run this thru' Dave F, for a second opinion.

Adjustable Reflow Pallets

May 6, 2002 | > I am looking for anyone who may have information > on adjustable reflow pallets. Could you please > provide a supplier and contact. My dilema is that > during an initial NPI build the PCB's may not > arrive with rail adds. I need a way to transfer > this PCB through the SMT

Design Guide

Apr 29, 2002 | systems hole to lead clearance has also been quoted as a minimum of 0.008" but you must consider the tolerance of leads and the PCB. There is a PCB Design For Manufacture CD and video in the SMTNet book shop you may care to check out. Bob Willis, Airport Lounge on his way to San Jose

IPC Spec for PTH Hole Size Tolerance

Apr 10, 2002 | I would like to know the Stated Specification for PTH size tolerances. Or is there a generalised acceptable limit?. We have some PCB's with hole sizes that I consider to be way off what I would deem acceptable, ie Finished hole size should be 0.89mm, actual hole size 0.8/0.82. The PCB manufacturer

BGA Straight crack

Feb 21, 2002 | Hello, I had recently a problem of crack between the solder ball (SnPb) and the Ni layer of the PCB pad. We use Electroless Ni/Au technology for PCB. This phenomena is amazing because the crack is very clean (straight) and it creates a space between the solder ball and the Ni layer. The ball

soldering and bonding on gold PCB's

Jan 9, 2002 | soldering and bonding on gold PCB's -100. PCB makers don't seem to like that at all. One supplier won't bid on them. We don't have a plasma cleaner, though I have used them and I agree that they make a big difference. We solvent clean our modules after installing the board and before bonding.

Measuring PCB Stress during the assembly process

Nov 27, 2001 | Measuring PCB Stress during the assembly process We are currently looking for a way to measure pcb stress during our assembly process. We would like to get an idea of what amount of stress (flex) the boards are undergoing. We would also like to use this to compare a few different processes--for example router depaneling compared to cutter

Universal VCD Tooling - 22inch dual head.

Nov 26, 2001 | The tooling fixture has tooling pins to accomidate your PCBs. Typical PCB tooling holes are 0.125" dia. non-plated thru holes and 0.250"x0.250" from the edge of the PCB. Check out this link to EMC Global Technologies. They mfg. tooling fixtures for UIC machines. Maybe they can help.

BGA REWORK

Oct 10, 2001 | I used to rework many types of BGA's including ceramic. We always preheated the whole board to around 115 c before attempting to remove or place. Now I find myself in a new company with different ideas. Do any of you have a site that has exact recommended times and temperatures for PCB as well as BGA. I am trying to prevent additional damage to the PCB, i.e. during board expanding to compensate for heat as well solder joint issues contributed to not preheating the board. Thanks, Chris

BGA Rework

Oct 10, 2001 | I used to rework many types of BGA's including ceramic. We always preheated the whole board to around 115 c before attempting to remove or place. Now I find myself in a new company with different ideas. Do any of you have a site that has exact recommended times and temperatures for PCB as well as BGA. I am trying to prevent additional damage to the PCB, i.e. during board expanding to compensate for heat as well solder joint issues contributed to not preheating the board. Thanks, Chris

PCB finish - Printhead vs Squeegee

Sep 18, 2001 | PCB finish - Printhead vs Squeegee Hello Jeff, I found some good information from what I read until now...so thank you! I have two questions: 1) What finish did you use on the PCB for 0201 ? I think with an aperture so small (12x15mils) tin plated is impossible, what do you think? 2) Did you use squeege or print head

Wave Soldering Ceramic PCB's

Aug 16, 2001 | Wave Soldering Ceramic PCB's - a result components on the topside getting to about 165, 170 deg C and they can pop from the PCB, sometimes leaving the solder in place with a nice impression of the lead in the remaining solder. John

Printing problem, water soluble paste with gold plating PCB..

Jul 31, 2001 | Printing problem, water soluble paste with gold plating PCB.. Sorry I forgot to provide enough information. Stencil thickness is 6 mil Aperture width is 10 mil Aspect ratio (aperture area / wall area) = 0.72 Solder paste mesh size, type 3 (-325 +500) With this aspect ratio we can printing without any problem when I use another paste with another PCB

Paste In Hole

Jul 9, 2001 | had some blades that had been "re-edged" a number of times, they worked much better than the ones with new blades. Careful about tightening the tolerances on your pcb thru holes, you may get a tolerance stack up and be unable to fit the connector into the pcb.

Can the old datecode Entek PCB be converted to HASL ?

Jul 5, 2001 | Can the old datecode Entek PCB be converted to HASL ? Thanx Dave, I agree with you on the planning part...yapp!! the same guy who've thrown an old datecode components to me..now they did it again on the PCB. Well Dave, could you explain a little bit more about the "hi-test flux" that you mentioned above. Can I used the paste flux ? i.e. the one we

Can the old datecode Entek PCB be converted to HASL ?

Jul 5, 2001 | Can the old datecode Entek PCB be converted to HASL ? Thanx Dave, I agree with you on the planning part...yapp!! the same guy who've thrown an old datecode components to me..now they did it again on the PCB. Well Dave, could you explain a little bit more about the "hi-test flux" that you mentioned above. Can I used the paste flux ? i.e. the one we

Removing Green Masking on PCB's

Jun 14, 2001 | Removing Green Masking on PCB's Hello. We are a contract manufacturer that requires the removal of the green making layer on a PCB board. What we need to do is expose some of the conductive trace (estimated .025 length) to create a solder joint to a SMD. It sounds ridiculous, but were asked to do so. What my question is, does

PCB Size Trends

May 23, 2001 | PCB Size Trends The trend of the smaller PCB and devices has been occurring for many years now. However, recently, we are seeing signs that a segment of the market is returning to larger board sizes....30" x 30" and larger. Does anyone have good sources for data and or direct experience with the trend. I am

PCB Size Trends

May 23, 2001 | PCB Size Trends The trend of the smaller PCB and devices has been occurring for many years now. However, recently, we are seeing signs that a segment of the market is returning to larger board sizes....30" x 30" and larger. Does anyone have good sources for data and or direct experience with the emerging trend

BGA CORNER WARP

May 4, 2001 | BGA warpage combined with PCB warpage can lead significant process yield loss. First, it is possible that major portion of BGA's apparent warpage is, in fact, coming from the PCB warpage. Assuming that the warpage is solely from BGA itself, I think unfortunately there wouldn't be any root

BGA short at same spot after few time rework.

Apr 25, 2001 | Zam_bri: If it were a mystery .... there can�t be any answers . Possible causes: - Short is in the PCB ( not very propable, cause you�ve checked that ) - Short is in the BGA ( not very propable, cause you�ve checked that ) - Short occurs due to solderbridging between two neighboring balls Well , that raises different questions: Does the PCB or BGA warp during rework? Is the surface ( soldermask) OK prior to the attachment of the new BGA? How do you apply Paste or what does your process look like? Is this occurring only with one product or with all kind of Boards, BGAs ? Hard to tell from

PCB Trouble shooting Lab

Apr 17, 2001 | PCB Trouble shooting Lab of it "..:)) do u know whoever can do this? Of course , we got some ideas about the equipement ....but sure we need your help as Experties in this The boards application will be:- - High speed PCB's - RF Board - Some high cost Consumer boards as well Best Regards Hunter

Recycle ESD bag ?

Mar 20, 2001 | is already bad so it does not matter weather the bags were used or not. This way you can ensure good product has good (new) bags. I hope I explained the relationship here.....Good PCB, good (new) Bag; Bad PCB, used bag. Best regards, Cal FYI- I am for hire

PCB Gold Plating

Feb 7, 2001 | PCB Gold Plating I know this subject has been beat to death, but I need a clarification. I keep getting mixed messages about how much gold is required on a PCB for a reliable solder joint. Some people are saying 3 - 5 microns, some are saying 3 - 5 micro inches. Do all of you realize that these are two very

Placement accuracy

Feb 7, 2001 | I did a quick some quick searches for Accuspec and saw some links to a PCB manufacturer. Is this the same company, or do you know the #?? I am not really in the equipment evaluation mode. I am looking for a system that will assist in maintaining capability throughout all of the platforms I listed originally. I want to use this a periodic (annual) measurement. I am beginning to look at Topline (they provide a PCB to do CPk studies). However, I am unclear on how accurate the results will be. I appreciate the feedback.

Begenner advise

Nov 30, 2000 | I am electronic hobbyist, which has made a prototype for electronic lock. On showing this to a company they become greatly interested. All the Smt for the prototype were placed manually on the prototype. I would like to set up a line without any human intervention for the PCB. The maximum size of the PCB is 200mm by 200mm.The production expected is of 50000 assorted units. The board will contain 90 components. I would like some suggestions on where I can educate myself on the process. I would also appreciate a theoretical assembly setup. The budget for the MST line is of 80000 Euro.

Begenner

Nov 30, 2000 | I am electronic hobbyist, which has made a prototype for electronic lock. On showing this to a company they become greatly interested. All the Smt for the prototype were placed manually on the prototype. I would like to set up a line without any human intervention for the PCB. The maximum size of the PCB is 200mm by 200mm.The production expected is of 50000 assorted units. The board will contain 90 components. I would like some suggestions on where I can educate myself on the process. I would also appreciate a theoretical assembly setup. The budget for the MST line is of 8000 Euro.

Non-heated dispensing system

Benchtop Fluid Dispenser