Contents
What is HASL plating?
HASL / Lead Free HASL HASL is the predominant surface finish used in the industry. The process consists of immersing circuit boards in a molten pot of a tin/lead alloy and then removing the excess solder by using ‘air knives’, which blow hot air across the surface of the board.
What is the difference between ENIG and HASL?
HASL is generally preferred for hand-soldering due to the easy joint formed. However, HASL leaves an uneven surface despite the leveling process. ENIG, on the other hand, provides for a very flat surface making ENIG preferable for fine pitch and high pin count components especially ball-grid array (BGA) devices.
What is immersion gold plating?
Immersion Gold Plating is a process that applies a very thin layer of gold by displacement of the surface atoms. This means the coating is not very thick, typically between three and eight micro inches. It offers some corrosion resistance and is used to extend the shelf life of parts waiting for soldering operations.
What is OSP finish in PCB?
OSP is a water-based, organic surface finish that is typically used for copper pads. It selectively bonds to copper and protects the copper pad before soldering. OSP is environmentally friendly, provides a coplanar surface, is lead-free, and requires low equipment maintenance. Flat surface.
What is PCB OSP?
Organic solderability preservative or OSP is a method for coating of printed circuit boards. It uses a water-based organic compound that selectively bonds to copper and protects the copper until soldering. The compounds typically used are from the azole family such as benzotriazoles, imidazoles, benzimidazoles.
How is Enig done?
It consists of an electroless nickel plating, covered with a thin layer of gold, which protects the nickel from oxidation. The gold is typically applied by quick immersion in a solution containing gold salts. Some of the nickel is oxidized to Ni2+ while the gold is reduced to metallic state.
What is meant by electroless plating?
Electroless plating, also known as chemical or auto-catalytic plating, is a non-galvanic plating method that involves several simultaneous reactions in an aqueous solution, which occur without the use of external electrical power. It is mainly different from electroplating by not using external electrical power.
What is application of PCB?
PCBs are used for medical devices such as: Medical imaging systems: CT, CAT and ultrasonic scanners often use PCBs, as do the computers that compile and analyze these images. Monitors: Heart rate, blood pressure, blood glucose monitors and more depend on electronic components to obtain accurate readings.
What’s the difference between Enig and Hasl gold plating?
On the other hand, the ENIG process is an immersion gold plating process that can only be conducted by PCB manufacturers. The result is a flatter surface that allows large ball-grid array packages to hold on properly. Because ENIG doesn’t need an air knife process, its boards have improved thermal durability.
What kind of finish is used for PCB plating?
The resulting topography of the HASL finish is not flat enough for many very dense, high pin-count, tight-pitch components surfaces The properties and uses of this finish are the same as HASL — except there is virtually no lead in the alloy. Instead, the alloy is a tin and copper, tin and nickel, or tin, copper, nickel and germanium alloy.
What’s the difference between HASL and Enig PCB?
ENIG, on the other hand, seems a bit pricier than HASL because it undergoes the gold immersion processes and comes with more layer boards. Unlike HASL, ENIG PCB has perfect corrosion resistance. With this, it becomes perfect for wire bonding
Why is Enig the best surface finish for PCBs?
Electroless Nickel Immersion Gold (ENIG) consists of two layers of metallic coating: The Nickel is the actual barrier between the board itself and the copper and allows for soldering. The gold which protects the nickel when it comes to storing it. Here are some of the reasons why ENIG is the best surface finish for PCBs: