Customer scenario

A South Korean MEMS supplier producing microphones and barometric sensors needed a reliable inline solution for ASIC chip encapsulation and frame-level solder‑paste (stencil‑free) coating on MEMS packages. Market demand required sustained volume growth to keep the customer among the top regional suppliers, while quality and yield targets tightened for voice‑grade microphones and pressure sensors used in mobile and automotive applications. The customer sought a machine that could deliver stable long‑run operation, full-process verification, and flexible throughput scaling without introducing handling damage to delicate MEMS die.

Mingseal GS600M solution 

Mingseal proposed the GS600M Inline Visual Encapsulation Dispensing Machine configured for two coordinated processes: precision under-seal/encapsulation of MEMS ASICs and uniform solder‑paste coating of package frames. The GS600M’s robust transport, high-resolution vision, and configurable valve architecture directly address the customer’s throughput and quality requirements.

Key technical approach

• Dual-process integration: The GS600M was programmed to perform sequential operations on each substrate — first frame-level solder‑paste coating (stencil‑free micro‑dispensing) to prepare contacts, followed by ASIC encapsulation or protective sealant around MEMS elements. This integrated flow eliminates additional handling steps and reduces thermal/mechanical stress on fragile devices.
• Vision-guided, zero‑omission verification: High‑resolution cameras perform fly‑align positioning and post‑dispense inspection. The system supports both 100% inline optical inspection for critical points and configurable statistical sampling (auto switch to spot-check mode) for non-critical batches, ensuring immediate detection of missing or malformed deposits and preventing long runs of undetected defects.
• Configurable single/dual‑valve architecture for UPH scaling: For customers targeting higher throughput, the GS600M supports an optional dual‑valve module. In dual‑valve mode, parallel dispensing paths raise UPH by 60–80% depending on recipe and substrate layout, enabling rapid scale-up while maintaining dispense accuracy.
• Stable transport and process repeatability: Precision conveyor control and laser‑altimeter Z compensation protect MEMS diaphragms from contact and maintain consistent standoff during frame paste coating and encapsulation. This reduces handling-induced yield loss common in competitive systems with less stable transport mechanics.

Performance and production outcomes

• Yield improvement: With optimized recipes and inline verification, the GS600M delivered a measurable lift in first-pass yield for MEMS microphone and barometer assemblies—an improvement in the range of 0.03–0.07% compared to previous competitor lines. This small percentage gain translates to substantial reductions in rework and scrap across high-volume production.
• Avoidance of sustained defects: The combined 100% inspection and smart spot-check modes prevent long runs of undetected failures. When the system detects a trend, it triggers alarms and recipe rollback, enabling rapid process correction and minimizing impact on downstream assemblies.
• Higher throughput without sacrificing quality: Enabling the dual‑valve module increased effective UPH by 60–80% in validated layouts, allowing the customer to meet growing demand while keeping footprint and labor costs controlled.
• Consistent solder‑paste coating and encapsulation integrity: The GS600M’s thermal and dispense controls produce even solder‑paste coverage on package frames and reliable sealant wetting around ASICs, preserving MEMS acoustic and pressure performance after assembly.

Conclusion 

For Korean MEMS manufacturers aiming to sustain regional leadership in microphones and pressure sensors, the GS600M provides an integrated, high‑stability platform for ASIC encapsulation and frame solder‑paste coating. Its vision‑guided zero‑omission inspection, optional dual‑valve throughput scaling, and precise transport mechanics deliver improved yields (0.03–0.07% uplift), robust defect prevention, and a 60–80% UPH increase when dual‑valve modules are enabled. Contact Mingseal to run a process validation and tune dispense recipes for your MEMS package geometries and production targets.