When the project comes to PCBA prototyping& small batch production, the ShenZhen factories is a good way to cost-down and also shorten the lead time.
Of course, the first step is sending the production-related files, include the PCB Gerber file/spec, and the BOM list, together with the quantity, to the PCB factory for quotation.Normally, the factory will make a PCBA quotation, based on:
- PCB Cost.
- Components;
3 . Assembly Cost; - Others, such as Testing/Programming/shipping, or your customized services.
1. PCB Cost
The PCB cost is mainly depends on the PCB main spec and area. Besides, the PCB cost also depends on the PCB quality needs, which differs a lot.
- If your PCB design simple(2/4 layer) and do not have detailed request on stack up& impedance control, and some mirror drawback acceptable, there some Shenzhen “Express PCB” works, the price really good and quality remain OK.
The price from JLC/PCBway/Seeed are good, they can even make the price to $0.99 for the most simple prototyping board (2 layer, small board) . I do not know how could them make the price so low, this should be business Competition, to get more customer for further orders. For relative larger quantity, the price is depends on the final area, the unit price would be about $100/㎡(including all the fee such as testing fee/tooling fee) for 2 layers, and $150/㎡ for 4 layer board.
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If your PCB design relative complicated, more than 6 layers, or you have BGA designs/blind vias/impedance controlling, there the “express PCB” can’t not be used. They need to be built by more “Industrial” PCB factory. There the price would be higher especially the starting fee. For a 2 layer PCB, the starting fee would be about $50, while maybe only $5 with “express PCB”. But the price difference got smaller as the quantity goes bigger… for an order totally 100 ㎡, the price would be almost the same.
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You need to check with your factory the very detailed spec of the PCB spec, to avoid misunderstanding, includes:
● PCB Material: It would be bad mistake if you want FPC but the factory quote/produce with FR4
● PCB Color: Normally it could be Green/Yellow/Black/White/Red, etc… the most popular used is Green… Personally, I like the Purple color, the OSH Park supports that with a good price.
Purple PCB Board Purple PCB Card
● PCB layer: Sometime, the inner layer with “Negative film” maybe ignored, check if the factory got your all right, or it may lead to serious problem.
● Other PCB spec such as thickness(can be 0.6/0/8/1.0/1.2/1.6..), surface polishing... -
Lead time. Normally, for “Express PCB” prototyping, 2~3 days OK, while much longer with advanced PCB(normally >10 days) if urgently, ask them to ship the package to you with express shipping but not airmails…the shipping could be 2~4 days from Shenzhen to any place on the world.