Technical Library | 2015-08-13 15:52:40.0
Pad cratering has become more prevalent with the switch to lead free solders and lead free compatible laminates. This mainly is due to the use of higher reflow temperature, stiffer Pb-free solder alloys, and the more brittle Pb-free compatible laminates. However, pad cratering is difficult to detect by monitoring electric resistance since pad cratering initiates before an electrical failure occurs. Several methods have been developed to evaluate laminate materials' resistance to pad cratering. Pad-solder level tests include ball shear, ball pull and pin pull. The detailed methods for ball shear, ball pull, and pin pull testing are documented in an industry standard IPC-9708. Bansal, et al. proposed to use acoustic emission (AE) sensors to detect pad cratering during four-point bend test. Currently there is an industry-working group working on test guidelines for acoustic emission measurement during mechanical testing.
Technical Library | 2013-03-21 21:24:49.0
This paper explores the behaviour of a copper test vehicle with multiple reflowed solder joints, which has direct relevance to ball grid arrays (BGA) and high density interconnect structures. The paper explores the relative stress conditions on the distributed joints and the sensitivity to ball joint shape... First published in the 2012 IPC APEX EXPO technical conference proceedings
New Equipment | Assembly Services
PCB Assembly Quickturn and Prototype PCB Assembly. That's what you need, that's what we do. We can support small engineering projects up to full turn-key, medium volume production. With in-house process verification tools like AOI, Xray and Ersas
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Manufacturer of Real-time Automated Xray Inspection. Focus on SMT solder joint inspection of hidden joints ie, BGAs and PTH Barrel Fill per IPC-610. Clients include leading manufacturers in the electronics/automotive Industries.
PCBA(RoHS-Compliance,Lead free,ODM,OEM,SMT,EMS) We supply OEM and ODM services for PCBA. 1) Surface-mounting Technology (SMT) and Through-hole/DIP 2) 0402,0201 placement 3) BGA,CSP,QFP 4) IC precision: 0.3mm 5) AOI,X-Ray,ICT(In circuit test),FC
Technical Library | 2020-10-27 02:07:31.0
For companies that choose to take the Pb-free exemption under the European Union's RoHS Directive and continue to manufacture tin-lead (Sn-Pb) electronic products, there is a growing concern about the lack of Sn-Pb ball grid array (BGA) components. Many companies are compelled to use the Pb-free Sn-Ag-Cu (SAC) BGA components in a Sn-Pb process, for which the assembly process and solder joint reliability have not yet been fully characterized. A careful experimental investigation was undertaken to evaluate the reliability of solder joints of SAC BGA components formed using Sn-Pb solder paste. This evaluation specifically looked at the impact of package size, solder ball volume, printed circuit board (PCB) surface finish, time above liquidus and peak temperature on reliability. Four different BGA package sizes (ranging from 8 to 45 mm2) were selected with ball-to-ball pitch size ranging from 0.5mm to 1.27mm. Two different PCB finishes were used: electroless nickel immersion gold (ENIG) and organic solderability preservative (OSP) on copper. Four different profiles were developed with the maximum peak temperatures of 210oC and 215oC and time above liquidus ranging from 60 to 120 seconds using Sn-Pb paste. One profile was generated for a lead-free control. A total of 60 boards were assembled. Some of the boards were subjected to an as assembled analysis while others were subjected to an accelerated thermal cycling (ATC) test in the temperature range of -40oC to 125oC for a maximum of 3500 cycles in accordance with IPC 9701A standard. Weibull plots were created and failure analysis performed. Analysis of as-assembled solder joints revealed that for a time above liquidus of 120 seconds and below, the degree of mixing between the BGA SAC ball alloy and the Sn-Pb solder paste was less than 100 percent for packages with a ball pitch of 0.8mm or greater. Depending on package size, the peak reflow temperature was observed to have a significant impact on the solder joint microstructural homogeneity. The influence of reflow process parameters on solder joint reliability was clearly manifested in the Weibull plots. This paper provides a discussion of the impact of various profiles' characteristics on the extent of mixing between SAC and Sn-Pb solder alloys and the associated thermal cyclic fatigue performance.
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Contract manufacturer, complete service for assembled boards.
Training Courses | | | PCB Rework and Hand Soldering Courses
The PCB rework and hand soldering courses courses cover techniques of rework and repair of PCBs, BGAs and other electronics assemblies, and teach fundamentals of soldering of electronics assemblies.
Printed Circuit Board Assembly Services Through-Hole Our wave soldering and hand soldering processes are fully compliant with the highest commercial (IPC-A-610D) and military specifications. Surface Mount We use automated screen printing and pick-
Industry News | 2019-04-23 08:08:27.0
Saki Corporation announces the release of its new 2Di-LU1 inline bottom-side automated optical inspection (AOI) system at NEPCON China, Shanghai, China, and SMTconnect, Nuremberg, Germany. Saki's 2D line-scan technology is ultra-fast, capturing the image of an entire 460x500mm printed circuit board assembly (PCBA) and carriers of 610x610mm in one pass, in real time, storing the image into memory, and creating inspection data for the entire board.
IPC is the trade association for the printed wiring board and electronics assembly industries.
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