A-TECH carbon lead free hasl pcb company for wholesale

Company Advantages
1. The quality of A-TECH pcb gold plating is strictly tested. We check the color fastness of the fabric/attachment, and the overall construction of this product. It is lead-free and environmental-friendly and has passed SGS test
2. There will professional technical persons to help you if there is any problems for our lead free hasl pcb. It has passed AOI which ensures there will be no errors or welding defects
3. A quality assurance system is instituted to demonstrate compliance with the requirements of standards. It stands out for its impact endurance performance
4. Comprehensive quality control is carried out to ensure the product meets with all related quality standards. Being laminated by advanced vacuum lamination equipment, it has a uniform dielectric thickness after lamination

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.

Company Features
1. Thanks to the diligent efforts made by our A-TECH staff, we have been rapidly grown into a leading lead free hasl pcb manufacturer.
2. As the trustworthy peelable solder mask pcb supplier, A-TECH has been always providing the best quality products.
3. A-TECH CIRCUITS Co., Ltd.' purpose is to strengthen its technological power to be an expert in hasl pcb finish field. Ask!