In LED module production, the selection of domestic solder paste directly determines solder wetting rate, void rate and cleaning difficulty. Jiajinyuan 8MQP/5RQ series LED solder paste achieves nearly 100% solder wetting in QFN/DFN packages; the 8M9P/5RR series module solder paste is halogen-free with an extremely low void rate; the 8MA series balances the conventional pitch of lighting LEDs and residue transparency. Multiple domestic solder pastes have passed production line verification, becoming cost-effective alternatives to imported LED solder pastes.

Solder paste samples must closely align with actual production line requirements. Domestic solder pastes already have replacement capability in terms of QFN solder wetting rate, halogen control, void rate, and laser welding adaptability. The 8MQP/5RQ series achieves nearly 100% solder wetting, the 8M9P/5RR series delivers zero halogen and extremely low void rate, and the 5RLJ series is specifically optimized for jet valve dispensing. SMT solder paste selection should use process window matching, residue transparency, and post-soldering cleaning cost as hard indicators.

High-wettability solder paste directly determines solder climb rate and void control in the soldering of fine-pitch devices such as QFN/DFN. Domestic solder paste brand Jiajinyuan covers the full spectrum from no-clean ROL0 to water-washable ORH1. Its 8MQP/5RQ series achieves nearly 100% solder climb, while the 8M9P/5RR series has an extremely low void rate and is suitable for automotive lighting. The selection of SMT solder paste must match the coupling relationship among alloy melting point, flux activity, and cleaning process.

To address the common issue of solder collapse during the soldering of fine-pitch components such as 0.4mm pitch QFN and 0.3mm CSP, we recommend a range of field-tested anti-collapse solder pastes that cater to specific requirements including zero halogen, low voiding, and high solder climb. Among them, the 8MNTTP/5RNTT series achieves a solder climb rate of over 98% with transparent residue during reflow soldering on mobile phone motherboards, while the 8M9P/5RR series delivers a void rate of less than 3% on automotive LED lighting boards. All products use T4/T5 grade fine-pitch alloy powder and rosin-based flux vehicles, making them truly triple-positioned products that are anti-collapse solder pastes, fine-pitch solder pastes, and domestic solder pastes suitable for domestic production lines.

Continuous printing solder paste directly affects yield and line changeover efficiency in SMT production lines. Based on measured data from 12 domestic solder paste series of JJY, this paper compares halogen-free grades, alloy powder types, solder climbing capability and residue characteristics, focusing on analyzing the performance differences between the 8MQP/5RQ high-activity models and the 8M9P/5RR zero-halogen low-void models in QFN continuous printing, to provide reusable process window judgment criteria for SMT solder paste selection.

For high-volume SMT production lines, the quality stability of domestic solder paste directly determines the first pass yield and rework cost. The 8MQP/5RQ series achieves nearly 100% solder wetting rate for QFN packages, with both halogen indicators below 1500ppm; the 8M9P/5RR series is halogen-free with an extremely low void rate, making it suitable for high-heat scenarios such as automotive lighting. These mass-produced solder pastes have been validated at multiple leading EMS manufacturers for over 6 consecutive months with no batch-related failures. Solder paste selection for SMT must match the reflow profile window and device pad design. Domestic solder paste has evolved from being usable to being reliable.

For production lines with tight budgets but non-negotiable welding quality, Jiajinyuan's domestic solder paste centers on its halogen-free, lead-free high-temperature series, covering scenarios such as high solder climbing for QFN/DFN, precision welding of communication equipment, and low voiding for automotive lamps. It offers economical solder paste with T3/T4 grade 0307/305 alloy powder, ensuring SMT solder paste printability, reflow stability, and residue transparency while keeping the per-kilogram cost within an industry-advantageous range.

Medium-temperature solder paste for electronic assembly is irreplaceable in soldering temperature-sensitive devices such as LEDs, crystal oscillators, copper wire lights, and transparent displays. The 8M/2R series medium-temperature solder paste launched by domestic solder paste brand Jiajinyuan is compatible with alloys such as Sn64Bi35Ag1, with a melting point of 151–172℃ and a soldering temperature of 195–220℃. It balances wettability and low thermal stress, and ensures printing accuracy with T2.5–T5 grade fine powder particle size, making it a cost-effective choice to replace imported medium-temperature solder paste.

In repair prototyping scenarios, syringe solder paste selection must balance solder wetting performance, residue transparency, and equipment compatibility. Among domestic solder pastes, the Jiajinyuan 8MQP/5RQ series achieves nearly 100% solder wetting on QFN/DFN devices, while the 8MNTTP/5RNTT series contains only 100~200ppm of halogens with transparent residues, making it particularly suitable for high-precision repair solder paste needs such as mobile phones and Bluetooth devices.

Multiple 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.

Addressing the printing challenges of 0201 small components, domestic solder pastes need to balance the high-resolution transfer rate and low voiding rate of fine-powder solder pastes. Two 0201 solder pastes, Jiajinyuan LFP-JJY5RNTT-0307 and LFP-JJY5RR-0307, are recommended. The former contains 00507BN/T5 fine powder with 100~200ppm halogen, suitable for high-precision consumer electronics. The latter is halogen-free ROL0 grade with T4 powder, featuring outstanding thermal cycling reliability, and has achieved 98.7% solder joint coverage on mobile phone motherboard production lines.

To address the mounting challenges of 01005 micro components, domestic solder paste brands have achieved stable printing and solder wetting of high-density solder pastes in openings below 0.3mm through the synergistic optimization of T4/T5 grade ultra-fine alloy powder, ROL0 grade ultra-low halogen control, and rosin-based active systems. Among them, the 8MNTTP/5RNTT series achieved over 92% solder joint coverage in actual tests on mobile phone motherboards, significantly outperforming conventional T3 powder solutions.

To address the frequent occurrence of cold solder joint defects on SMT production lines, this domestic solder paste, through optimized alloy powder ratio and flux activity design, achieves nearly 100% solder wetting rate on QFN/DFN devices while significantly reducing void rate. Its multiple product lines, including halogen-free, zero-halogen, water-washable and laser-compatible variants, cover different process requirements, making it a cost-effective anti-cold-solder-joint solder paste solution to replace imported SMT solder pastes.

To address the frequent solder whisker issues on SMT production lines, domestic anti-whisker solder paste significantly suppresses solder tip formation without reducing solder wetting rate by optimizing alloy powder morphology, particle size distribution, and flux rheological properties. Models such as LFP-JJY5RQ-0307T4 and LFP-JJY5RNTT-305 have been experimentally verified to be compatible with QFN packages below 0.3mm, making them a cost-effective domestic solder paste solution to replace imported SMT solder paste.

Low-residue solder paste and no-clean solder paste are becoming key choices for cost reduction and efficiency improvement in high-density PCBA production lines. Domestic solder paste has already demonstrated the capability to replace imported alternatives in terms of halogen control, solder climbing performance, and thermal stability. The Jiajinyuan 8MNTTP/5RNTT series achieves ultra-low halogen levels of 100~200ppm with transparent residue, while the 8M9P/5RR series reaches 0ppm zero halogen with extremely low voidage, making it suitable for high thermal reliability scenarios such as automotive lighting.

Domestic solder paste that resists oxidation and maintains long-term stability once opened is designed for high-frequency lid opening and intermittent printing scenarios on SMT production lines. It adopts a ROL0 zero-halogen rosin-based formula and a T4/T5 fine powder alloy system, significantly improving the shelf life and printing lifespan of antioxidant solder paste series such as 8MQP/5RQ and 8MNTTP/5RNTT. It achieves nearly 100% solder wetting rate for QFN packages while ensuring clear post-reflow residue, making it a high-reliability choice for replacing imported SMT solder paste and reducing oxidation risks of domestic solder paste.

Solder paste samples must be selected based on actual production line requirements. Domestic solder pastes already have the capability to replace imported ones in terms of QFN solder climbing rate, halogen control, and adaptability to special processes. SMT solder paste selection should prioritize matching device packaging, reflow window, and cleaning requirements. For example, the 8MQP/5RQ series achieves nearly 100% solder climbing for high-density QFNs, while the 8M9P/5RR is suitable for low-void sensitive scenarios such as automotive lighting.

When planning to replace solder paste on the production line, it is necessary to balance solder wetting rate, void rate, residue transparency, and equipment compatibility. Based on frontline SMT process verification, this paper sorts out 16 domestically produced solder paste models that have been applied in mass production, covering typical scenarios such as high solder wetting for QFN/DFN, low voids for automotive lighting, laser dispensing, stainless steel/aluminum welding, and ultra-low temperature applications. It focuses on recommending SMT solder pastes such as 8MQP/5RQ, 8M9P/5RR, and 8MNTTP/5RNTT, providing directly actionable selection criteria for domestic solder paste replacement.

Solder paste selection for SMT factories must match production line equipment, component packages, and reliability requirements. Among domestic solder pastes, the Jiajinyuan series covers hard requirements such as over 90% solder wetting for QFN, low voids in automotive lamps, and no solder balls for laser dispensing. SMT solder paste parameters such as 0307T4 alloy with a melting point of 221–227°C, ROL0 halogen <500ppm, and translucent rosin residue have been batch-verified on mobile phone motherboards and communication modules.

To 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.