PCB Fabrication

The Difference Between Enig And Enepig

by:A-TECH      2020-10-26

It also allows for a significantly safer, cleaner, and more ecologically-pleasant manufacturing course of due to the complete omission of lead. Since there is no need for an air knife course of, ENIG boards warp much less – particularly when very thin – and have barely improved thermal sturdiness. There are many kinds of surface finish used for plating the Printed Circuit Boards. E.g. Organic Surface Protectant , Immersion Silver , Immersion tin, Electroless Nickel with Immersion Gold coating , and direct gold plating . Among them, HASL and ENIG have been dominating the market for many years.

ENIG can be difficult for some printed circuit board manufacturers, as black pad may be troublesome to detect when examining the floor end since the gold completely covers the final surface. ENIG has been a popular floor end because of its very flat surface, ability to deal with multiple reflow cycles and good shelf life. However, there could be challenges with nickel corrosion that can cause what is called “Black Pad”. Black pad occurs when the nickel underneath the gold plating corrodes excessively and the component soldered to that pad loses connectivity.

We detail the most common floor finishes in another weblog post called Printed Circuit Board Finishes. There you will find information on the more common finish types used by a printed circuit board manufacturer, together with Electroless Nickel Immersion Gold , HASL, Lead Free HASL, and more.

Recent will increase in gold prices and the demand for lead free finishes have driven improvements in the immersion gold processes for both ENEPIG and ENIG. While ENEPIG has been round for the reason that mid-90s, the price, features, and advantages over ENIG have brought on it to realize in latest popularity.

As one of the most extensively produced raw supplies, nowhere is this more prevalent than in manufacturing of circuit boards. As noted earlier, solder leveling is an intensive process that involves the usage of several harsh, environmentally unfriendly chemicals corresponding to lead and flux. This is why the European Union went by way of great measures to eliminate the usage of leaded HASL and solder with the RoHS program. The United States government has lately been becoming a member of the motion by devising tax incentives for companies who utilize non-lead-primarily based merchandise.

HASL had been famous up to now and ENIG is gaining market nowadays. Due to anti lead legal guidelines in EU, China, California, and so on, calls for for ENIG have elevated in the past few years. Silver surface finishes could be utilized to copper traces with an electroless immersion response, displacing the copper layer. The course of involves submerging the circuit boards in a shower of molten tin/lead alloy after which eradicating excess solder utilizing ‘air blades,’ which blow scorching air via the plate floor. ENIG PCB finish is a double layer metallic coating with nickel that acts both as a protective barrier to the copper circuits and a floor on which the components are welded.

Although barely extra pricier than immersion tin, immersion silver finish provides everything that the aforementioned methodology supplies at a thickness virtually four instances less than the former. On prime of that, it offers better solder formation, and is a superb choice for boards with high frequency indicators. As cohabitants of planet earth, we should always all be mindful of our surroundings.

While HASL is a wonderful method there are actually drawbacks. Electroless Nickel Immersion Gold is a gold plating technique generally used by PCB manufacturers to allow for a variety of advantages over other strategies. It creates a significantly flatter surface, a significant necessity for giant ball-grid array packages to adhere correctly.

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