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Electronics Forum | Wed Dec 17 09:53:26 EST 2003 | davef
IPC-2222 - Sectional Design Standard For Printed Board For Organic Printed Boards, Table 9-3 � Plated Through Hole Diameter To Lead Diameter Relationships will give you the standard information you require. If we can�t get proper hole fill after try
Electronics Forum | Fri Feb 17 18:33:08 EST 2006 | mika
Paste In Hole "PIH" or Pin In Paste "PIP" are two different names of the same process. As far as I know this is fairly simple: the reason from the beginning is to avoid an extra process step/steps in the production line. That is to produce through h
Industry News | 2021-01-12 09:13:33.0
Expanded Line of CDE's NHR-Slimpack High-Temperature Prismatic Capacitors are released by New Yorker Electronics
Industry News | 2021-12-15 20:08:31.0
Siemens pressure transmitter is a kind of equipment which converts pressure into pneumatic signal or electric signal for control and remote transmission. It can convert the physical pressure parameters such as gas and liquid sensed by the load cell sensor into standard electrical signals (such as 4 ~ 20mADC), which can be supplied to the secondary instruments such as indicating alarm instrument, recorder and regulator for measurement, indication and process adjustment.
Technical Library | 2019-06-21 10:39:15.0
Recently, an ACI Technologies (ACI) customer called to discuss failures that they had observed with some through-hole capacitor parts. The components were experiencing failures following vibration and accelerated stress testing. Upon receipt of the samples, ACI performed three levels of inspection and Energy Dispersive Spectroscopy (EDS) testing to investigate the root cause of the failures. These analyses enabled ACI to verify the elements comprising the solder joints and make the following recommendations in order to prevent future occurrences. The first inspection was to investigate the capacitor leads using optical microscopy, and no anomalies were found that could indicate bad parts from the vendor or improper handling prior to assembly. However, vertical fill in the barrel of the plated through-holes was too close to the IPC-A-610 minimum specification of 75% to determine a pass/fail condition, and therefore required further investigation.
Technical Library | 2021-09-29 13:35:21.0
In PCB circuit assemblies the trend is moving to more SMD components with finer pitch connections. The majority of the assemblies still have a small amount of through hole (THT) components. Some of them can't withstand high reflow temperatures, while others are there because of their mechanical robustness. In automotive applications these THT components are also present. Many products for cars, including steering units, radio and navigation, and air compressors also use THT technology to connect board-to-board, PCB's to metal shields or housings out of plastic or even aluminium. This is not a simple 2D plain soldering technology, as it requires handling, efficient thermal heating and handling of heavy (up to 10 kg) parts. Soldering technology becomes more 3D where connections have to be made on different levels. For this technology robots using solder wire fail because of the spattering of the flux in the wires and the long cycle time. In wave soldering using pallets the wave height is limited and pin in paste reflow is only a 2D application with space limitations. Selective soldering using dedicated plates with nozzles on the solder area is the preferred way to make these connections. All joints can be soldered in one dip resulting in short cycle times. Additional soldering on a small select nozzle can make the system even more flexible. The soldering can only be successful when there is enough thermal heat in the assembly before the solder touches the board. A forced convection preheat is a must for many applications to bring enough heat into the metal and board materials. The challenge in a dip soldering process is to get a sufficient hole fill without bridging and minimize the number of solder balls. A new cover was designed to improve the nitrogen environment. Reducing oxygen levels benefits the wetting, but increases the risk for solder balling. Previous investigations showed that solder balling can be minimized by selecting proper materials for solder resist and flux.
SMTnet Express, June 24, 2021, Subscribers: 26,990, Companies: 11,385, Users: 26,722 Filling of Microvias and Through Holes by Electrolytic Copper Plating — Current Status and Future Outlook The electronics industry is further
Imagineering, Inc. | https://www.pcbnet.com/blog/class-ii-vs-class-iii-inspection-standards-in-pcb-assembly/
. There is a difference between Class 2 and Class 3 when it comes to the amount of barrel fill that’s used in the through-hole leads
Surface Mount Technology Association (SMTA) | https://www.smta.org/southeast-asia/
. The related manufacturing personnel are well aware of common encumbering defects happen erratically with this process. Some of these defects encountered daily are bridging, solder skips, solder voids and insufficient barrel fill or hole-fill
