New Equipment | Assembly Services
Shenzhen YatSing PCB Co,.Ltd has been supplying printed circuit boards since 1981 ,as a leading manufacturer of Printed Circuit Boards in China,we provide excellent quality and lower price(specially lower price in single&double layer boards),and we
New Equipment | Assembly Services
• Place of Origin: Guangdong, China (Mainland) • Brand Name: ShanXu • Model Number: PCB RoHS Compliant • Number of Layers: 1-30 layer • Base Material: FR4, High Tg FR4, Halogen Free, SYL, Rogers, Aluminium • Copper Thickness: 1/3oz ~ 6oz • Boar
Electronics Forum | Tue Apr 24 02:56:12 EDT 2007 | chrispy1963
If the PCB you are using is a HASL pad finish and is a leaded assembly, we use homeplate pads with a 5 mil stencil. If the circuit has Enig finish and is PB-Free then we use 1:1 apertures with a 5 mil stencil Either method should provide no solde
Electronics Forum | Mon Aug 02 08:54:15 EDT 2010 | vetteboy86
I believe it is LF HASL. I will need to double check.
Industry News | 2018-10-18 10:16:53.0
Solder Tinned Pads vs Gold Plated Pads - The Importance of Selecting the Proper Surface Finish
Parts & Supplies | Circuit Board Assembly Products
1). FR-4 Tg170, Lead-free, Low Z-axis CTE, Low water absorption. 2). Excellent thermal stability and anti-CAF performance 3). 2-30 layer, 1.6mm thick 4). 1 oz copper finished 5). 10% impedance control 6). Immersion gold, HASL LF. 7). Suitable for hig
Technical Library | 2021-10-20 18:21:06.0
The solderability of the SAC305 alloy in contact with printed circuit boards (PCB) having different surface finishes was examined using the wetting balance method. The study was performed at a temperature of 260 _C on three types of PCBs covered with (1) hot air solder leveling (HASL LF), (2) electroless nickel immersion gold (ENIG), and (3) organic surface protectant (OSP), organic finish, all on Cu substrates and two types of fluxes (EF2202 and RF800). The results showed that the PCB substrate surface finish has a strong effect on the value of both the wetting time t0 and the contact angle h. The shortest wetting time was noted for the OSP finish (t0 = 0.6 s with EF2202 flux and t0 = 0.98 s with RF800 flux), while the ENIG finish showed the longest wetting time (t0 = 1.36 s with EF2202 flux and t0 = 1.55 s with RF800 flux). The h values calculated from the wetting balance tests were as follows: the lowest h of 45_ was formed on HASL LF (EF2202 flux), the highest h of 63_ was noted on the OSP finish, while on the ENIG finish, it was 58_ (EF2202 flux). After the solderability tests, the interface characterization of cross-sectional samples was performed by means of scanning electron microscopy coupled with energy dispersive spectroscopy.
Surface Mount Technology Association (SMTA) | https://www.smta.org/icsr/speaker_forms/Paper-Format-Requirements.doc
. Immersion silver surface finish eliminated due to corrosion risk Alternative finish must meet ICT and solderability requirements Investigate several alternatives (OSP, ImSn, ENIG, and LF HASL) PCB laminate may change from what was used on DT and NB products
