PCB board selection of lead - free spray tin and lead spray tin difference?

Shenzhen kingford is a professional manufacturer of printed circuit board manufacturing circuit board, for many years focused on single, double-sided, multi-layer circuit board production. Can provide impedance board, HDI board, blind hole plate and other multi-layer PCB board proofing, small batch production business. Next, we introduce the PCB board selection of lead - free spray tin and lead spray tin difference.

PCB board selection of lead - free spray tin and lead spray tin difference

1, lead-free tin spray belongs to environmental protection process, does not contain harmful substances "lead", the melting point is about 218 degrees; The temperature of the tin furnace should be controlled at 280-300 degrees; Overwave soldering temperature should be controlled at about 260 degrees; The over-reflow welding temperature is about 260-270 degrees. 

2, lead spray tin does not belong to the environmental protection process, containing harmful substances "lead", melting point about 183 degrees; Tin furnace temperature should be controlled at 245-260 degrees; Overwave soldering temperature should be controlled at about 250 degrees; The over-reflow welding temperature is about 245-255 degrees.

3, from the surface of tin, lead tin is bright, lead-free tin is dull; Lead-free plates are less invasive than those with lead.

4. The lead content of lead-free tin is not more than 0.5, and the lead content of leaded tin reaches 37.

5, lead will improve the activity of tin wire in the welding process, lead tin wire is relatively better than lead-free tin wire; But lead is toxic and is not good for people in the long run. Lead-free tin has a higher melting point than leaded tin, and the welding points will be much stronger.

6. In the surface treatment of PCB board, usually the price of lead-free tin spray and leaded tin spray is the same, there is no difference.

PCB board service advantage

Energy production from 2 layers to 14 layers, 14-22 layers can be proofing production.

Minimum line width/spacing: 3mil/3milBGA Spacing :0.20MM

Minimum aperture: 0.1mm Size :610mmX1200mm

Ink: Tamura, Taiyo, Fudoken;

FR4: Shengyi, Kingboard, Harbour, Hongren, Guoji, Hezheng, Nanya,

(Shengyi S1130/S1141/S1170),Tg130℃/ Tg170℃ T g180℃ and other high TG plates)

High frequency plate: Rogers, Taconic, ARLLON;

Surface process: tin spray, lead-free tin spray, gold plating, full plate gold plating, plug gold plating, full plate thick gold, chemical tin (silver), anti-oxidation (OSP) blue glue, carbon oil

2. What information should a perfect BOM list contain for SMT processing?

BOM is a very important material in SMT processing, it is the abbreviation of the list of components. It lists all the components required on the circuit board and the specification parameter information of each component. In a general BOM, the product name, material number and description of each material are listed in detail, as well as the information about the quantity and supplier. A perfect BOM usually has flowcharts and instructions.

To sum up, a perfect BOM contains the following:

Step 1: Number

2. Material name

3. Specifications/models

4. Encapsulation

Step 5: Brand

Step 6 Use

7. Material specifications

8. Supplier information

9. Note note

At kingford, we usually explain to the customer what BOM is required. If the customer provides CAD data or Gerber data directly, we cannot ensure the complete and correct output of the customer's bill of materials. Therefore, we usually ask the customer to provide the original BOM so that we can use the correct material in SMT processing.

SMT machining advantage

1. Highly professional: The company focuses on processing samples and small and medium-sized batches, and promises to deliver the materials within 3-5 working days after confirmation.

2. Professional equipment: The company's equipment is tailored for sample and small and medium-sized batch production of advanced equipment, can stick 0201, BGA spacing 0.3MM, QFN, CSP, CON and other components.

3. Professional technology: 100% of technical backbone workers have more than 5 years of work experience, 85% of front-line operators have more than 3 years of work experience.

4. The company implements the 5S and 6σ concepts in daily operation, so as to ensure that the shipment is checked at least 7 times. If the quantity reaches 100PCS, our company promises to pass AOI optical inspection.

5. The company promises that the straight through rate of welding is more than 99%. If customers find welding defects, the company promises to repair them free of charge.

Why choose Shenzhen kingford?

1. Strength guarantee

▪SMT workshop: We have imported SMT machines and several sets of optical inspection equipment, with a daily output of 4 million. Each process is equipped with QC personnel, who can keep an eye on product quality.

▪DIP production line: We have two wave-soldering machines, among which there are more than 10 old employees who have worked for more than three years. The skilled workers can weld all kinds of plug-in materials.

2. Quality assurance, cost-effective

▪ High-end equipment can stick precision shaped parts, BGA, QFN, 0201 materials. Can also template patch, loose material hand.

▪ Sample and size batch can be produced, proofing from 800 yuan, batch 0.008 yuan/point, no start-up fee.

3. Rich experience in SMT and welding of electronic products, stable delivery

▪ Accumulated SMT SMT processing services for thousands of electronic enterprises, involving many kinds of automotive equipment and industrial control motherboard. The products are often exported to Europe and the United States, and the quality can be affirmed by new and old customers.

▪ On time delivery, normal 3-5 days after complete materials, small batch can also be expedited on the same day shipment.

4. Strong maintenance ability and perfect after-sales service

▪ Experienced maintenance engineers can repair all kinds of patch welding caused by bad products, to ensure the connection rate of each piece of circuit board.

▪ 24-hour customer service staff at any time response, the fastest speed to solve your order problems.