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High-frequency PCB soldering is a core step in 5G high-frequency PCB SMT soldering, which directly determines signal integrity and transmission stability in the millimeter-wave frequency band. Jiajinyuan has verified on substrates including FR4, Rogers, and Taconic that the solder paste filling rate of 0.15mm micro-via pads is >92%, and the post-reflow coplanarity is ≤18μm. By optimizing squeegee pressure and trapezoidal compensation for stencil apertures, the high-frequency PCB soldering yield is stably maintained above 99.3%.
Published: 2010-01-11To address persistent production-line issues such as excessive voiding, poor solder climbing, and residual whitening in high-precision PCB assembly, this paper directly examines the measured performance of 8M9P/5RR zero-halogen low-void solder paste and 8MNTTP/5RNTT ultra-low-residue domestic solder paste. Combined with QFN device soldering, communication module rework, and automotive LED thermal management scenarios, it explains how low-void solder paste achieves a void rate of <3% through 0ppm halogen control, T4-grade fine powder distribution, and 305 alloy melting point matching, while also balancing PCB solder paste printing accuracy and batch stability of domestic solder paste.
Published: 2009-05-31Multiple domestic solder pastes were tested for key indicators including QFN solder climb rate, void control, and residue transparency. PCB solder paste selection must match the specific process window. The activity of soldering paste is inversely proportional to its halogen content. Domestic solder pastes now cover the full gradient from zero-halogen ROL0 to halogen-free ROL1. 8M9P/5RR achieves automotive lighting-grade low void rates, while 8MNTTP/5RNTT achieves over 90% solder climb on high-density pads of mobile phone motherboards.
Published: 2009-04-25To address production-line pain points in new energy circuit board soldering, such as poor solder climbing, high voiding rate, and excessive halogen residue, this paper draws on 20 years of frontline SMT experience to recommend multiple domestic solder pastes suitable for QFN/DFN packages, automotive lighting, and high-precision communication modules, covering niche scenarios including zero-halogen, water-washable, laser-specific, and ultra-low-temperature formulations. It focuses on analyzing the real process performance of the 8MQP/5RQ, 8M9P/5RR, and 8MW5/5RW5 series in meeting the three core demands for new energy solder paste, PCB solder paste, and domestic solder paste.
Published: 2009-04-05To meet stringent requirements in high-density PCB soldering such as fine pitch, high solder climb rate, and low void rate, multiple domestic halogen-free, lead-free high-temperature solder pastes compatible with T3/T4/T5 grade fine powder solder pastes are recommended, covering high-activity scenarios for QFN/DFN, precision placement in communications and consumer electronics, low-void thermal management for automotive lamps, and special models for laser dispensing. All products use 0307/305 alloy powders with a measured melting point of 217–227℃, balancing printability, wettability, and residue transparency.
Published: 2009-02-26Insufficient solder is a frequently occurring soldering defect in SMT production lines, especially prominent on large pad designs and PCBs with copper thickness of 2oz or above. Its essence is the combined effect of decreased solder paste transfer rate and insufficient wetting during the printing, placement, and reflow stages, requiring coordinated intervention across multiple links such as stencil aperture, squeegee pressure, peak temperature of the reflow profile, and nitrogen purity.
Published: 2009-02-24To address production-line pain points in high-density PCB assembly, such as poor solder climbing in QFN/DFN packages, high voiding rates, and whitish residues, this paper draws on 20 years of frontline SMT experience to directly recommend domestic solder paste models suited to different process windows, covering three core needs: high-density solder paste, PCB solder paste, and domestic solder paste. It focuses on analyzing the measured performance of series including 8MQP/5RQ, 8M9P/5RR, and 8MNTTP/5RNTT in terms of solder climbing rate, halogen control, alloy powder particle size distribution, and reflow compatibility.
Published: 2009-01-05Our technical team is always ready to provide professional solder material selection advice and SMT process solutions.