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 Why is PCB assembly so expensive?

The price of PCB is something that many buyers have been confused about. Many people will also question how these prices are calculated when placing an order online. Let's talk about the components of PCB price together.

1. Different materials used in PCB cause price diversity
For example, the ordinary double-sided board, the sheet material generally has FR4 (Shengyi, Kingboard, Guoji, three prices from top to bottom), the board thickness ranges from 0.2mm to 3.0mm, and the copper thickness varies from 0.5oz to 3oz. All of these have caused a huge price difference in the sheet material; in terms of solder mask ink, there is also a certain price difference between ordinary thermosetting oil and photosensitive green oil.
2. Different surface treatment processes cause price diversity
Common ones are: OSP (anti-oxidation), lead spray tin, lead-free tin spray (environmental protection), gold plating, immersion gold (6 layer Rigid-flex Immersion Gold PCB), and some combination processes, etc. The prices of the above processes are getting higher The later is more expensive.
3. The price diversity caused by the difficulty of PCB itself
Two kinds of circuit boards have 1000 holes. One board has a hole diameter greater than 0.2mm and the other board has a hole diameter of less than 0.2mm, which will result in different drilling costs. All kinds are larger than 4mil, and one kind is smaller than 4mil, which will also cause different production costs; secondly, there are some designs that do not follow the ordinary board process flow are also extra money, such as half-hole, BVH (buried/blind via hole) PCB , The hole in the plate, and the key board are printed with carbon oil.
4. The different thickness of copper foil causes price diversity
Common copper and platinum thicknesses are: 18um (1/2OZ), 35um (1OZ), 70um (2OZ), 105um (3OZ), 140um (4OZ), etc. The thickness of the above copper foil becomes more expensive as it goes back.
5. Customer's acceptance criteria for High Quality PCB Quickturn Products
Commonly used are: IPC2, IPC3, enterprise standard, military standard, etc. The higher the standard, the higher the price.
6. Mold fee and test stand
(1) Mold cost. For prototypes and small batches, the general plate factory uses the drilling and milling shape, and there will be no additional milling fees. When making large quantities, mold punching is required, so there is a set of mold costs. The board factory generally quotes above RMB 1,000.
(2) Test fee: The prototype is generally tested by flying probes, and the board factory generally charges 100-400 yuan for the test fee; the test rack is required to test in batches, and the test rack is generally quoted by the board manufacturer between 1,000-1,500 yuan.
7. The price difference caused by different payment methods
The shorter the payment time, such as cash payment, the lower the price.
8. Order quantity/delivery time
(1) The smaller the quantity, the more expensive the price is, because even if it is 1PCS, the board factory has to do the engineering data, and the film is out, whichever process is indispensable
(2)Quick-turn PCB fabrication delivery date: The data delivered to the PCB factory must be complete (GERBER information, the number of layers of the board, the plate, the thickness, the surface treatment, the ink color, the character color and some special requirements must be clearly written ), Quick Turn PCB is money based on time, so it is also expensive.
From the above discussion, it is not difficult to see that the diversity of PCB processing prices has its inherent inevitable factors. This article can only provide a rough price range for reference. Of course, the specific price is still in direct contact with the manufacturer.