Eleminating False Positive ICT Response through the Use of Organic-Metal Final FinishAuthors: Rita Mohanty, John Fudala, Sathiya Narayana
Company: Enthone Inc.
Date Published: 9/27/2015 Conference: SMTA International
Historically, there have been two major types of final finishes: organic or metallic. As the ICT test probes requires a conductive pad/surface to perform the test, metallic final finishes works well for ICT. Organic finishes, such as organic solderability preservatives (OSP), faces challenges when it comes to ICT testing. Many fabricators prefer to use OSP because of its low cost but end up losing the cost advantage by implementing additional steps on the fabrication process to add metallic finish to the test pads on a PCB.
This paper will present results from a series of statistically designed experiments that includes different types of probes for in-circuit testing along with different types of final finishes to demonstrate pin testability of the various surface finishes. Through this exercise, we will be able to provide assemblers guideline in choosing the correct final finish for their end application.
Organic Metal (OM) final finish, OSP, ICT, probe design, metallic finish
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