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Choosing the right Surface Finish for Chip on Board assembly is crucial. One of the most frequent questions we are asked at KingCredie Technologies is how should my PCB be plated in order to ensure wire bond-ability. PCB Plating for Chip on Board Assembly must be planned in advance to ensure manufacturability of the device. This planning begins with design rules and selecting the wire bond method to be used. Common wire bond materials include aluminum or gold wire. Aluminum Wedge Wire Bonding and ENIG Plating One of the most common wire bond methods for COB assembly is aluminum wire bonding. For aluminum wire bonding to a PCB the plating can be a low cost method known as ENIG or Electroless Nickel with Immersion Gold. With ENIG plating a PCB with Copper traces is plated with a Nickel layer and then the nickel layer has a flash gold layer on top. The Flash Gold is a barrier layer to protect the Nickel from oxidation. The wire bonding connection is actually from the aluminum wire to the Nickel plating. The main advantage of this method is inexpensive plating and relatively easy wire bonding. The disadvantage is Aluminum wire bonding is less flexible than gold bonding and generally requires larger bond pad pitch compared to gold bonding. Gold Ball Wire Bonding and soft gold plating For Gold Ball Bonding to Printed Circuit Boards a thick layer of soft gold has traditionally been required. In this Case the copper traces on the PCB are plated with a nickel layer and then a soft gold layer measuring between 15 and 30 micro-inches. The gold is electroplated and when plated correctly provides an excellent surface for wire bonding. This method has the advantage allowing for fine pitch gold ball bonding. The disadvantages are high cost and the thick gold layer can cause reliability problems with surface mounted components due to gold dissolution into the solder. Gold Ball Wire Bonding with ENEPEG plating In recent years Electroless Nickel, Electroless Palladium, Immersion Gold plating has been proven to be the best compromise between cost and manufacturability. This method of plating is known and ENEPIG and is common referred to as the universal plating method. It is called universal plating because it offers good wire bond ability and good solder ability. It is suitable for RoHS solders as well as Eutectic SnPb solder. The typical plating thickness is 100 to 150 micro inches of nickel followed by 4 – 10 micro inches of palladium followed by 1-2 micro inches of gold. ENEPIG is suitable for both Gold and Aluminum wire bonding. Additionally, With recent increases in the price of gold price to levels above US$1200 per troy oz, the production cost of electronic device that required thick gold electroplating becomes extremely difficult to control. Since the cost of palladium metal has remained relatively low in comparison to gold, an opportunity for cost saving by replacement of gold with palladium is now available. At KingCredie for PCB plating with Chip on Board we recommend using ENEPIG as a preferred plating method.For more information,tell us what you want to know.
The board is made very precisely, it's clean and very pleasant to touch. Markings on the silkscreen layer are very good readable. Soldering does not cause trouble, tin adheres very well to soldering points with a small amount of flux. It is also worth mentioning that the PCB is very robust to desoldering. The company is very solid, although you order 10 pieces, you get at least 1 PCB more for test, prototype, present, etc. When I signed up for an account, I also got a $20 coupon for free. Excellent construction and assembly work done by PCBgogo.No problems encountered, highly recommended.
PCBGOGO now has build a plan to sponsor electronic hobbyist's do pcb project (up to $50)here is the links:http://www.pcbgogo.com?code=yFor eachone resigner they give 20$ as a coupon.
I ordered my first PCBs from www.jlcpcb.com last week, and I am very impressed. I usually get my PCBs from seeedstudio ..... but now it will be JLCPCB. It's my firist order. Unimaginably, my first order , shipping ,free !!!! Just cost $2 !!!! Can't unbelive this. I order the senond, shipping ,display $18 to Candan. The customer service told me: free shipping just for first order. Here is quick review, in point form; · Great web site and is update. Can actually see PCB manufacture process of order, tracking, design, etc.. everything is in one place. Nice. · 5 days to arrive at my door, from time of order. I am in Candan.· PCBs packed very well. · Silks screen is very detailed and 'fine' · Price is the cheapest... · Shipping is with DHL, which i like. I like red I have a new try and choose a red mask. I like red, it’s bold and eye-catching. Green with white silkscreen.green is probably the best of all the available colours in practical terms. Below boards from JLCPCB. They were all cut perfectly to size, all perfectly etched and drilled, tinned. Inspection of fine traces on the board for defects is best done with some form of magnification. Electrically, the SIMM tested fine.