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Visit PSI's main Coplanarity Services page for more information. PSI has over 20 years experience restoring gull wing leads on QFP and SOIC packages, as well as myriad surface mount connector styles. The goal of lead restoration is not to mimic "l
Electronics Forum | Mon Jul 22 02:13:31 EDT 2019 | jandon
some PQFN package configurations have no toe exposed or do not have a continous solderable surface on the exposed toe and a toe fillet will not form. (IPC-A-610F 8.3.13)
Electronics Forum | Fri Jul 19 22:26:32 EDT 2019 | dhanish
Thanks Dave..What is the voids spec for QFN?This is another challenge with the QFN's
Industry News | 2017-04-13 17:29:30.0
Saki Corporation will demonstrate the advanced capabilities and new extra component detection (ECD) feature of its BF-3Di 3D automated optical inspection (AOI) systems at NEPCON China on April 25-27, 2017 at the Shanghai World EXPO Exhibition & Convention Center in Shanghai, China, in booth 1J25.
Technical Library | 2018-05-23 12:12:43.0
Driven by miniaturization, cost reduction and tighter requirements for electrical and thermal performance, the use of lead-frame based bottom-termination components (LF-BTC) as small-outline no-leads (SON), quad-flat no leads (QFN) packages etc., is increasing. However, a major distractor for the use of such packages in high-reliability applications has been the lack of a visible solder (toe) fillet on the edge surface of the pins: because the post-package assembly singulation process typically leaves bare copper leadframe at the singulation edge, which is not protected against oxidation and thus does not easily solder-wet, a solder fillet (toe fillet) does not generally develop.
Technical Library | 2023-08-04 15:38:36.0
The MicroLeadFrame® (MLF®)/Quad Flat No-Lead (QFN) packaging solution is extremely popular in the semiconductor industry. It is used in applications ranging from consumer electronics and communications to those requiring high reliability performance, such as the automotive industry. The wide acceptance of this packaging design is primarily due to its flexible form factors, size, scalability and thermal dissipation capabilities. The adaptation and acceptance of MLF/QFN packages in automotive high reliability applications has led to the development of materials and processes that have extended its capabilities to meet the performance and quality requirements. One of process developments that is enabling the success of the MLF/QFN within the automotive industry has been the innovation of side wettable flanks that provide the capability to inspect the package lead to printed circuit board (PCB) interfaces for reliable solder joints. Traditionally, through-board X-ray was the accepted method for detecting reliable solder joints for leadless packages. However, as PBC layer counts and routing complexities have increased, this method to detect well-formed solder fillets has proven ineffective and incapable of meeting the inspection requirements. To support increased reliability and more accurate inspection of the leadless package solder joints, processes to form side-wettable flanks have been developed. These processes enable the formation of solder fillets that are detectable using state-of-the-art automated optical inspection (AOI) equipment, providing increased throughput for the surface mount technology (SMT) processes and improved quality as well.
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AOI - Omron RNS/RNS_ptH, VI3000, Marantz 22X IPC-610D Class 3, Pb/Pb free process, 5S, FMEA, MSA, PPAP, SPC, CPK, 6Sigma, lean manufacturing, Quality management, ISO/TS 16949 ,ISO 9001,ISO 14 001
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AOI - Omron RNS_ptH, RNS-LS, VT-WIN2 VI3000 Marantz 22X IPC 610D certified ISO 9001-2008, etc automotive standards ROHS
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic2306&OB=ASC.html
. The problem is more obvious for QFN parts. When using the "least" setting the it looks like the toe is just too short and the solder creates a bubble shaped contact instead of a nice fillet
Heller Industries Inc. | https://hellerindustries.com/wp-content/uploads/2018/07/leadfree.pdf
: Nitrogen Temperature:240°C Excellent Wetting in Toe and Heel – Small, Acceptable Voids Cross Section of QFP Solder Fillet PROPRIETARY AND CONFIDENTIAL INFORMATION Pages: 16 of 24 Rev Level: 1 Rev Date: 1/03/01 Test # 8 Material
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