What documents should be provided for PCBA quotation?

The information to be provided for PCBA processing is gerber file (production data Of PCB board) and bom list (material list or component list).The English name is Bill Of Material. It should be noted that the list of components should be as clear and detailed as possible, including the brand, specification, size, quantity and type of components etc.

What are the common types of PCBA substrates?

1. FR-4 sheet is an epoxy board with high mechanical and dielectric properties, good heat resistance and moisture resistance, and good mechanical processing.

2. The aluminum substrate is a metal-based copper clad laminate with good heat dissipation function. Generally, the single panel is composed of a three-layer structure, which is a circuit layer (copper foil), an insulating layer and a metal base layer. Aluminum substrates are commonly used in LED lighting products.There are two sides, the white side is the welding LED pin, and the other side is the color of aluminum, which will contact with the thermal conductivity after applying thermal coagulation.

3. The FPC board is a highly flexible and excellent flexible printed circuit board made of polyimide or polyester film. It has the characteristics of high wiring density, light weight, thin thickness and good bending characteristics.Used in high-end products such as mobile phones and hard drives.

Depending on the product application, the choice of PCBA substrate will be different. Generally, the more high-end products are, the more advanced PCBA substrates are and the more expensive they are.

PCBA storage conditions and requirements?

(1) conformal coating
For a long time not used PCBA board, should be coated with conformal coating,which has the functions of moisture-proof, dust-proof and anti-oxidation, which can effectively extend the storage time and extend the time after applying conformal coating for 9 months.

(2) vacuum packaging
PCBA storage is not in contact with air and water. Firstly, the PCBA board is packaged in a vacuum bag, and the edge of the box needs to be surrounded with a layer of bubble film when packing.The bubble film has better water absorption, which plays a very good role in moisture-proof. Of course, moisture-proof beads are also indispensable.Then sort the emissions and label them.After the box is sealed, the box must be separated from the wall, stored in a dry and ventilated place, and avoid sunlight.

(3) control the temperature and humidity of the warehouse
The temperature of the warehouse where PCBA is stored is preferably controlled at 23±3°C, 55±10%RH,the storage temperature is less than 25 degrees, the relative humidity is less than 65%, with temperature control and no corrosive gas in the indoor environment.For the OSP process PCB, due to its thin protective film, PCBA requires more stringent storage conditions for storage.