PCB Technical - What is the difference between lead-free tin spraying and lead tin spraying for PCB manufacturing?

ipcb is a circuit board manufacturer specializing in the manufacture of printed circuit boards, focusing on the production of single, double-sided and multilayer circuit boards for many years. It can provide proofing and small batch production of multi-layer PCB boards such as impedance boards, HDI boards, and blind buried via boards. Next, I will introduce the difference between lead-free tin spraying and lead-free tin spraying for PCB manufacturing.

PCB board

The difference between lead-free tin spraying and lead tin spraying for PCB board
1. Lead-free tin spraying belongs to an environmentally friendly process, does not contain harmful substances "lead", the melting point is about 218 degrees; the temperature of the tin furnace needs to be controlled at 280-300 degrees; the wave soldering temperature needs to be controlled at about 260 degrees; over reflow soldering The temperature is around 260-270 degrees.

  
2. Lead spraying is not an environmentally friendly process, and contains harmful substances "lead", with a melting point of about 183 degrees; the temperature of the tin furnace must be controlled at 245-260 degrees; the temperature of wave soldering must be controlled at about 250 degrees; the temperature of over reflow soldering Around 245-255 degrees.

3. From the surface of tin, lead-tin is brighter, and lead-free tin is dull; the wettability of lead-free board is a little bit worse than that of leaded board.

4. The lead content of lead-free tin does not exceed 0.5, and the lead content of leaded tin reaches 37.

5. Lead will increase the activity of the tin wire during the soldering process. The lead-tin wire is better than the lead-free tin wire; however, lead is poisonous, and long-term use is not good for the human body. Lead-free tin has a higher melting point than lead tin, and the solder joints will be much stronger.

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

PCB proofing

PCB board service advantages
The energy production is from 2 to 14 layers, and the 14-22 layers can be sampled and produced.
Minimum line width/spacing: 3mil/3milBGA spacing: 0.20MM
The smallest aperture of the finished product: 0.1mm Size: 610mmX1200mm
Ink: Tamura, Taiyo, Fudokken from Japan;
FR4: Shengyi, Kingboard, Haigang, Hongren, Guoji, Hazheng, Nanya,
(Shengyi S1130/S1141/S1170), Tg130 degree Celsius/ Tg170 degree Celsius Tg180 degree Celsius Contour TG sheet)
High frequency board: Rogers (Rogers), Taconic, ARLLON;
Surface technology: tin spray, lead-free tin spray, immersion gold, full board gold plating, plug gold plating, full board thick gold, chemical tin (silver), anti-oxidation (OSP) blue glue, carbon oil

PCBA processing plant

Why choose ipcb?
1. Strength guarantee
▪ SMT workshop: It has imported placement machines and multiple optical inspection equipment, which can produce 4 million points per day. Each process is equipped with QC personnel, who can keep an eye on product quality.
▪ DIP production line: There are two wave soldering machines. Among them, there are more than ten old employees who have worked for more than three years. The workers are highly skilled and can weld all kinds of plug-in materials.

2. Quality assurance, high cost performance
▪ High-end equipment can paste precision shaped parts, BGA, QFN, 0201 materials. It can also be used as a model for mounting and placing bulk materials by hand.
▪ Both samples and large and small batches can be produced. Proofing starts at 800 yuan, and batches start at 0.008 yuan/point, and there is no start-up fee.

3. Rich experience in SMT and soldering of electronic products, stable delivery
▪ Accumulated services to thousands of electronic companies, involving SMT chip processing services for various types of automotive equipment and industrial control motherboards. The products are often exported to Europe and the United States, and the quality can be affirmed by new and old customers.
▪ Delivery on time, normal 3-5 days after the materials are complete, and small batches can also be shipped on the same day.

4. Strong maintenance ability and perfect after-sales service
▪ The maintenance engineer has rich experience and can repair the defective products caused by all kinds of patch welding, and can ensure the connection rate of each circuit board.
▪ 24-hour customer service staff will respond at any time and solve your order problems as quickly as possible.