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4 layers PCB with IPC CLASS3 acceptance standard

4 layers PCB with SHENGYI S1000-2

4 layers PCB with impedance control

4 layers PCB with ENIG finish

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Immersion Tin, or Chemical Tin, it’s a RoHS Compliant metallic finish deposited by a chemical displacement reaction that is applied directly over the basis metal of the circuit board, the immersion Tin protects the underlying copper from oxidation over it’s intended shelf life, copper and tin however have a strong affinity for one another, the diffusion of one metal into the other will occur inevitably, directly impacting the shelf life of the deposit and the performance of the finish. The negative effects of tin whiskers growth are well described in industry related literature and topics of several published papers.

The typical thickness of Immersion Tin is ≥1.0UM and the shelf life is 6 months. The cost of Immersion Tin is more expensive than HASL but less expensive than Immersion Gold PCB and close to Immersion Silver. Similar to Immersion Silver, Immersion Tin is also sensitive in handling and storage, it requires PCB manufacturers to control and pack PCBs with Imm Tin more carefully.

The advantages of Immersion Tin

● Excellent flatness
● Mid range cost for lead free finish
● Good for fine pitch / BGA / smaller components
● Top choice for press fit technology
● Reworkable

The disadvantages of Immersion Tin

● Very sensitive to handling – gloves must be used
● Exposed Tin on final assembly can corrode
● Not good for multiple reflow/assembly processes
● Aggressive to soldermask – soldermask dam should be more than 5mil
● Baking prior to use can have a negative effect

A-TECH is capable of using Immersion Tin, we make the profile and electrical test before the process of Immersion Tin finish, and we use papers to separate each piece of boards to avoid scratches during package and transportation.

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A-TECH CIRCUITS Co., Ltd. Always put product quality first, not only select high-quality raw materials and use advanced production technology to manufacture carbon ink pcb, but also set up a professional quality inspection team to strictly monitor each production link and each production process, To ensure that the carbon ink pcb produced are of high quality.

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A-TECH CIRCUITS Co., Ltd. Introduce and learn from foreign advanced production methods, improve it in combination with its own conditions, develop a production method that is both in line with the company's conditions and efficient, and apply it to the production of carbon ink pcb, so that carbon ink pcb not only has high output, Moreover, it is durable, has a long service life, and has a certain quality guarantee.

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The company has been engaged in the production and sales of carbon ink pcb for many years, and has accumulated rich experience in production and management. The products produced are thick in materials, fine in workmanship, high in quality, beautiful and practical.

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The company has been engaged in the production and sales of carbon ink pcb for many years. It not only has advanced production and quality inspection equipment, but also has established a scientific quality inspection system.

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The carbon ink pcb of A-TECH CIRCUITS Co., Ltd. uses high-quality materials, exquisite workmanship, scientific structure, advanced design concept, and the finished product has the advantages of high precision, good durability, and high economic value.

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Its quality has been well controlled by strictly conducting quality control system.

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A-TECH bulk buy China carbon ink pcb Suppliers at discount