Technical Library | 2019-12-05 13:30:46.0
Conformal coatings are regularly employed to protect the surface of a soldered printed circuit board assembly from moisture, chemicals in the PCBA's service environment, and foreign objects or debris. Conformal coatings are nonconductive and therefore cannot be placed on any location where electrical contact will be required, such as connector pins, test points, and sockets. Conformal coatings are also not permitted on any mechanical interface location, such as mounting holes or brackets, to assure the proper fit between items in the final assembly. In order to apply conformal coatings to an assembly and comply with the restrictions on keep-out areas, masking is employed to protect those surfaces.
Technical Library | 2020-11-09 16:59:53.0
A customer contacted ACI Technologies regarding a high failure rate of their assemblies. They provided assemblies to be X-rayed and inspected for the purpose of identifying any process related issues such as (but not limited to) solder and assembly workmanship and evidence of damage due to moisture related problems during reflow (a.k.a. "popcorning"). Moisture damage usually appears as physical damage to the component. The first indication of moisture damage would be externally observable changes to the package in the form of bulging or fractures to the outer surface of the component, an example of which is shown in Figure 1. Internally observable indicators of moisture damage typically include fractures to the die inside the package and lifted or fractured wire bonds. These conditions would be apparent during transmissive X-ray inspection. Another symptom of moisture related damage would be inconsistent solder joint sizes that result from package deformation during the liquidus phase of the reflow process. None of these indicators of moisture related damage were present on the customer samples.
Events Calendar | Mon Mar 16 00:00:00 EDT 2020 - Mon Mar 16 00:00:00 EDT 2020 | ,
BGA & Area Array Failures, Causes & Corrective Actions Online Webinar
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Other courses related to electronics manufacturing and assembly
Used SMT Equipment | Adhesive Dispensers
YAMAHA placement machine YV100X type substrate size: 1, M-Type: L460 * W335 ~ L50xW50mm / t = 0.4 ~ 3.0mm 2, L-Type: L460 * W440 ~ L50xW50mm / t = 0.4 ~ 3.0mm 3, ※ATS20A use: L460*W250～L50xW50mm Second, YAMAHA placement machine YV100X productio
Events Calendar | Mon Apr 23 00:00:00 EDT 2018 - Thu Apr 26 00:00:00 EDT 2018 | Shanghai, China
SMTA China East Conference 2018
Industry News | 2003-05-21 08:13:48.0
Two half-day workshops on Thursday during SMTA
Parts & Supplies | Assembly Accessories
SMT MACHINE GENUINE SPARE PARTS JUKI FX-1 FX-1R TWO-PHASW STEPING MOTOR L900E321000 103H7823-17XE42 JUKI Pats Specifications: Brand Name JUKI FX-1 FX-1R TWO-PHASW STEPING MOTOR Part Number L900E321000 Model Number 103H7823-17XE42 Ensure Te
Industry News | 2003-05-30 07:52:35.0
New courses on today's most important topics in electronics manufacturing, assembly, and related business issues
Industry News | 2003-04-21 10:24:56.0
Learning today for tomorrow's demands
