As a Chinese hardware engineer, it is painful for me to wait one or two months for the PCB prototypes to be produced and assembled. And it really prevent us from product iterations in PCB.
The question is why it takes so long to manufacture several pieces of PCB but developing a software just take few days?
The answer is simple: it is like playing music with a band when we talk about software, but for the hardware, it is like coordinating an orchestra. It is true for all the manufactures around the word.
Don’t worry, the hard-working Chinese people have solved all this by offering PCB fast-prototyping services.
Just send them BOM, GEBER and NC DRILL files.
A four layer PCB with all the components assembled comes to us just in two weeks. And the quality is ensured by their testing facilities!
Take a look at their capability:
Standard PCB Specification
|Material||FR4 standard Tg 140C, FR4 high Tg 170C|
|Inner layer Copper Thickness||0.5oz-2oz(18um-70um)|
|Min Annular Ring||3mil|
|Min drilling Hole diameter||0.15mm(6mil), 0.1mm(4mil)-laser drill|
|Min width of cutout (NPTH)||0.8mm|
|Min width of slot hole (PTH)||0.6mm|
|Solder Mask||LPI, different colors(Green, Green matt, Black, Black Matt, White, Red, Yellow, Blue)|
|Silkscreen color||White, Blue, Black, Red, Yellow|
|Surface finish||HASL -Hot Air Solder Leveling
Lead Free HASL – RoHS
ENIG -Electroless Nickle/Immersion Gold – RoHS(Thick of Au 1-3 u”)
ENIG -Electroless Nickle/Immersion Gold – RoHS(Thick of Au 3-5 u”)
ENIG -Electroless Nickle/Immersion Gold – RoHS(Thick of Au >5 u”)Immersion Silver – RoHS
Immersion Tin – RoHS
OSP -Organic Solderability Preservatives – RoHS
|Surface/Hole plating thickness||20-30um|
|Board thickness tolerance||+/-0.1mm ~ +/-10%|
|Board size tolerance||+/-0.1mm~+/-0.3mm|
|PTH hole size tolerance||+/-.003″(+/-0.08mm)~+/-.006″(+/-0.15mm)|
|NPTH hole size tolerance||+/-.002″(+/-0.05mm)|
|Copper thickness tolerance||+0um+20um|
|Aspect Ratio(hole size: board thickness)||1:10|
|Chamfer of Gold Fingers||20, 30, 45, 60|
|Test||10V-250V, flying probe or testing fixture|
|Others Techniques||Gold fingers
peelable solder mask
Press fit hole
Via tented/covered with resin
Via plugged/filled with resin
Via in pad
Our board is in test equipment.