Technical Library | 2013-01-17 15:37:21.0
A problem exists with electroless nickel / immersion gold (ENIG) surface finish on some pads, on some boards, that causes the solder joint to separate from the nickel surface, causing an open. The solder has wet and dissolved the gold. A weak tin to nickel intermetallic bond initially occurs, but the intermetallic bond cracks and separates when put under stress. Since the electroless nickel / immersion gold finish performs satisfactory in most applications, there had to be some area within the current chemistry process window that was satisfactory. The problem has been described as a 'BGA Black Pad Problem' or by HP as an 'Interfacial Fracture of BGA Packages…'[1]. A 24 variable experiment using three different chemistries was conducted during the ITRI (Interconnect Technology Research Institute) ENIG Project, Round 1, to investigate what process parameters of the chemical matrix were potentially satisfactory to use and which process parameters of the chemical matrix need to be avoided. The ITRI ENIG Project has completed Round 1 of testing and is now in the process of Round 2 TV (Test Vehicle) build.
New Equipment | Assembly Services
PNC Inc. has been manufacturing hi-reliability printed circuit boards since 1968. All Military Spec PC boards are manufactured in the security of our Nutley NJ, USA facility. PNC is certified by the Department of Defense to Military Performance Speci
Industry Directory | Distributor / Manufacturer / Manufacturer's Representative
Specializing in Xray Fluorescence, Eastern Applied offers XRF solutions for RoHS testing, thin gold measurements (ENIG, ENIPIG), solder analysis, and much more. Authorized Distributor of Hitachi High-Tech XRF analyzers.
Industry Directory | Manufacturer
PCB Global is a dedicated Prototype Quick Turn High Tech. PCB supplier - Quotes and orders can be processed 24/7/365 - free online quotation visit www.pcbglobal.com
Industry Directory | Manufacturer
Since 1971, Eagle Electronics Inc. has provided our Customers with the highest quality Printed Circuit Boards at fair and competitive prices.
New Equipment | Soldering Robots
The premium model that achieves fast, precise, and high-quality soldering operation. Offering two slim types of high performance soldering robots that letting our customers choose the best one to fit their objectives. Both come with a clean cut feed
New Equipment | Solder Materials
V9 No Clean solder paste is formulated for near-zero voiding on BGA, BTC and LED soldering applications. Significant void reduction achievable on all surface finishes including ENIG, ImSn and OSP. V9 exhibits stable print performance on fine feature
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.
1-22 Layers PCBs FR-4, Rogers, High Tg FR4, CEM-1, CEM-3, etc. Material 0.4-6.0 mm Board Thickness Lead Free HASL, ENIG, Immersion Tin, Immersion Silver, OSP etc. Treatment Green, Red, White, Yellow, Black, Blue Solder Mask
Layer: Single-Sided Price：USD275.50 Quantity :3Panel Min Holes：2.00mm surface Treatment:ENIG solder mask:White silk screen : Black Board Thickness: 1.6mm Cu Thickness: 35um Aluminium Model: 5052 Thermal Conductivity: 150W/m. K Breakdown Voltage:
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