PCB supplier china:What is Immersion Tin ?
Immersion Tin (ImSn) is a metallic coating of‘Tin’, which is deposited directly over the top copper layer of a PCB that produced by PCB supplier china, which using an electroless chemical bath process. PCB finishes are used to protect the copper tracks and pads on printed circuit boards while in storage. Immersion Tin forms a dense uniform coating (0.8 to 1.2 micrometers) with good hole wall lubricity. Its appearance is usually White, so it is also called‘White Tin‘ during PCB supplier china .
Immersion Tin is not a usual displacement process; it is self-limiting and depends on the exchange between Copper and Tin. It can only take place in the presence of thiourea, which is a carcinogen, with health implications, so the process needs to be highly controlled.
Advantages of Immersion Tin Surface Finish:
- Shelf-life: 6 months
- Easy to rework (but rework should be limited)
- Due to its planarity (flatness), suitable for fine-pitch/ BGA/ small components placement
- Not expensive coomparing other finish in PCB supplier china
- Good for backplane panels, which are assembled using press fit pin insertion
- Offers good solderability after exposure to various thermal cycles
Disadvantages of Immersion Tin Surface Finish:
- Not durable, sensitive to handle
- Tin Whiskering: Tin Whiskering is an internal defect developed during Tin Deposition. Due to this, some material protrudes out of the structure, creating whiskers. These ‘Whiskers’ grow outwards and create a shorting problem with the adjacent connections.
- Environmental concerns with Thiourea (carcinogen) used during processing
- Not good for PTH
Other news about S&L
- Sun&Lynn Circuits CO., Ltd. was invited to attend the Sixth Global Customs AEO Conference!
- Celebrating the Establishment of SUNLYNN CIRCUITS(THAILAND)
- Good News! Sun&Lynn Circuits Co.,Ltd. is honored as one of the Top 100 Innovative Enterprises in Bao
- What Should You Know about Metal Core PCB?
- FPC supplier : the types of Flexible PCB
- PCB manufacturer China:Why PCB board snake line, what is it used for?
- What is Metal Core PCB and types of Metal Core PCB?
- Why are High frequency PCBs much more expensive than normal PCBs?
- Flexible PCB supplier China :When to use flexible PCB?
- Flexible PCB manufacturer:What Is Flex Soldering?
Your browsing history
- PCB manufacturer China How to choose which surface treatment for pcb
- Factors that Affect Flex rigid PCB Cost
- High frequency PCB:How to expand the life of your cellphone
- PCB supplier china:What are the standards for SMT and DIP assembly of components
- Routine Recycling Technology of Waste metal core PCB
- Advantages of Through-hole Automotive PCB Assembly
- FPC manufacturer:Tencent’s WeChat Releases Palm Pay
- Flex rigid PCB:Will the plug-in hybrid car be fed?
- Celebrating the Establishment of SUNLYNN CIRCUITS(THAILAND)
- Flexible PCB manufacturer What ate required to product your PCB
A total of -comments【I want to comment】