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2.1 Applicable Component Scenarios

Conventional chip resistors and capacitors (0402/0603/0805/1206 mainstream packages), small flat-body SMT devices, and small ICs without exposed bottom pads. These devices have flat bodies and low center of gravity with stable red glue bonding, suitable for wave soldering production.

2.2 Inapplicable Components & Layouts

BGA/QFN/LGA devices with bottom pads, fine-pitch precision ICs and heavy high-center-of-gravity devices are not applicable. PCB layouts with too small spacing between plug-in through-holes and chip components are prone to glue overflow and hole blockage, which requires preliminary DFM optimization and adjustment.

2.3 Mandatory PCB Design Requirements

Add solder resist dams on SMT pads to block horizontal red glue overflow; Stencil openings must strictly avoid all plug-in through-holes with precise pin avoidance; Arrange chip components in accordance with the wave soldering direction to avoid shadow missing soldering defects.

3. Comparative Analysis of Advantages and Disadvantages of Plastic & Aluminum Alloy Red Glue Stencil Processes

3.1 General Advantages of the Process

• Greatly improved production efficiency: Pre-fix bottom SMT components with red glue, and complete wave soldering at one time after plug-in, eliminating manual supplementary welding and saving a lot of labor costs.

• Low process implementation threshold: No need for high-cost selective wave soldering equipment, suitable for various production modes such as small and medium-sized factories and batch mass production.

• Strong printing consistency: Compared with manual dispensing, stencil printing features uniform glue volume and consistent curing effect, effectively solving common wave soldering defects such as chip component falling off and displacement.

• Compatible with mixed assembly processes: Perfectly solve the differentiated welding problem of "top plug-in + bottom SMT", becoming the mainstream cost-effective mixed assembly mass production process.

3.2 Process Deficiencies and Control Difficulties

• High precision dependence: Red glue has no self-correction ability after curing. Errors in stencil opening and through-hole avoidance design will cause batch defects, requiring extremely high tooling design precision.

• Difficult rework: Fully cured red glue has high hardness, making it difficult to disassemble chip components and putting forward high requirements for primary production yield.

• Scenario limitations: For high-vibration, high-reliability vehicle and military scenarios, the red glue bonding strength needs to be verified in advance to prevent component falling off during long-term use.

• High design threshold: Dense through-holes and close-spacing component layouts require professional DFM evaluation and avoidance optimization, and standard stencils cannot meet production requirements.

3.3 Comparative Advantages and Disadvantages of Two Types of Stencils

Plastic Stencil: High cost performance and short sampling cycle, suitable for small-batch and temporary orders; The disadvantages are poor long-term precision stability and short service life, not applicable to long-term large-batch mass production.

Integrated Aluminum Alloy Open-hole Stencil: High precision, no deformation, long service life and stable product yield, suitable for large-batch and high-precision mass production; Although the one-time customization cost is higher than plastic stencils, the long-term comprehensive use cost is lower.

4. Industry Summary & ECLEN Technical Advantages

The plug-in through-hole avoidance red glue stencil is the core key of DIP+SMT mixed wave soldering process.The avoidance design, opening precision and material selection of the stencil directly determine the yield of PCBA mass production. Plastic stencils are suitable for small-batch sampling, while integrated aluminum alloy open-hole stencils are the optimal solution for industrial mass production.

Suzhou ECLEN Electronic Technology Co., Ltd. has been deeply engaged in the design and production of SMT red glue stencils, wave soldering jigs and tooling fixtures for many years, focusing on solving mixed process defects such as component falling off, glue overflow, hole blockage and cold solder joints. We provide free pre DFM manufacturability evaluation based on customers' original PCB drawings and Gerber files, customize plastic and integrated aluminum alloy full open-hole red glue stencils, and support one-stop delivery of wave soldering carriers, helping customers reduce costs, improve efficiency and avoid batch defects.