PCB Fabrication

Why Enig Has Problems And How Enig

by:A-TECH      2020-10-23

Soft gold finish is used for boards designed mostly for functions that require wire bonding, excessive solderability and weldability. Soft gold produces a much stronger welded joint when in comparison with exhausting gold. Depending on applications, printed circuit board applied sciences use gold extensively.


Gold has good electrical conductivity, tarnish resistance, solderability after storage, and being wonderful etch resist. The PCB floor finish with ENEPIG is very thin (between zero.05μm and zero.1μm), making the assembly and soldering process quite simple and positively more reliable when compared to ENIG. ENEPIG additionally has a long shelf life due to its sturdiness and resistance from tarnishing.


If a lead-free surface finish is required you may want to attempt to use Lead-Free HASL. To create a HASL floor end, a board is submerged in molten solder (tin / lead). The solder then covers the entire uncovered copper surfaces on the board. Upon leaving the molten solder, high pressure scorching air is blown over the surface via air knives, this levels the solder deposit and removes the excess solder from the board floor.


ENIG consists of two layers of metallic coating, that are deposited on the copper surface through chemical process, 2-5μ inches of immersion Gold over μ inches of electroless Nickel . A surface finish is important for making a reliable connection between the PCB and the digital part. A surface end has two main features, to supply a solderable surface for adequate soldering elements to the PCB, and to protect any exposed copper from oxidizing.


Immersion Tin is a is a RoHS compliant (lead-free) surface finish that is an ideal alternative for flat floor necessities and fantastic pitch parts. White Tin is a deposit of a thin layer of Tin on Copper layer of a PCBs. It just isn't used as typically as different surface finishes as a result of not all PCB manufacturers provide it. The flatness of this specific coating makes this a perfect surface end choice for small geometries and components.


Heat, humidity and salinity conditions can pace up the process of oxidation of copper. Older solder fluxes may also include corrosive substances that will type shorts between close by traces over time. This is usually not a problem with SMT because the temperatures will be sufficient to interrupt down the acids. But when your boards require via-hole elements, NexPCB ensures that the fluxes used is not going to have an opposed impact on the efficiency and the solderability of your boards. It offers far better friction resistance than its alternatives, and is usually used to make .


However, just lately, manufacturers have realized it does have limitations. While HASL could also be low-value, the rise of improved floor mount applied sciences have exposed some shortcomings. One of the downsides of HASL is that it leaves uneven surfaces and isn't appropriate for fine pitch elements. Another downside is that HASL just isn't lead-free unless requested and having a different course of in place. There are different lead-free options that doubtless makes extra sense for a excessive-reliability product.

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