At present, the main products of SMT patches are lead-free soldering process, lead soldering process and red plastic soldering process. And its point calculation method is also very similar, but many users do not know much about the calculation and cost of SMT patch points.
Unit price of solder joint:
At present, the unit price of solder joints varies from 0.008 to 0.03 yuan per solder joint, which depends on the following conditions:1. Unit price according to process:
A Solder paste with lead SMT chip processing is relatively cheap.B Solder paste lead-free SMT chip processing costs are relatively high.
C Red plastic environmental SMT chip processing cost is relatively low.
D Solder paste red plastic dual-process SMT chip processing has high cost and relatively complicated process.
2. According to the order quantity:
A The common SMT chip proofing process is 3-20 pieces, which will charge engineering fees, and will not be calculated by multiplying the points by the unit price.B Small batch SMT chip processing and production below 1000 pieces will be charged the startup fee + points multiplied by the unit price.
3. Batch SMT chip processing, calculated by counting points multiplied by unit price.
A One-sided and one-sided SMT single-sided SMT chip processing is relatively fast, and two-sided SMT chip processing requires two turns of lines, which costs more.B. Precision analysis SMT patch processing is more precise. If there is a BGA \ high-density IC, the solder paste for the board will be expensive.
C. The density of chip components is large. There are many points in PCB boards of the same size. The efficiency will be high, because the shorter the coordinate stroke when the placement machine is working, the faster the SMT chip processing will be.
4. Start-up fee: The processing fee for a single batch of less than 1,000 yuan is a small batch processing order.
For small batch SMT chip processing orders, after counting the points, they will look at the types of board components, the time to debug the chip mounter, and the difficulty of making the first piece will add a startup fee ranging from 400 to 2,000 yuan.
5. Proofing fee: SMT patch processing order is a SMT patch proofing order with less than 100 pieces.
The difficulty of the board, the time for the program, the time for the transfer to the machine are different, and the charge is 800 yuan to 3,000 yuan. Engineering costs.
6. SMT stencil fee: according to the size of the PCB board, open different types of stencil.
According to the precision of the chip on the PCBA, choose to open the electric polishing steel mesh or ordinary steel mesh. The cost of different types of stencils is about 120 ~ 350. Of course, customers can also provide the stencil themselves.
