Flux evaporation for wafer bump

Thu, 02 Jul 2026 09:16:14 +0800

On the bump line, flux residue isn’t a cosmetic problem. It’s a yield killer. One cold spot in the evaporation zone and the flux doesn’t clear. Solder balls misalign. The reflow profile drifts. We built our flux evaporation thermal platform for that reality, where the thermal budget is non-negotiable and every wafer has to repeat. Here’s what actually matters under the hood. The system hits wafers with short-wave infrared from quartz-halogen emitters, and closed-loop control holds uniformity at ±0.1°C across the full 200/300 mm field. Response is sub-second, so soak and peak track the recipe without overshoot. Cleanroom Class 1–100 is supported by a particle-controlled architecture: low-outgassing materials, HEPA-integrated plenums, and surfaces that are smooth with no crevices. Repeatability is specified at ≤0.2% setpoint deviation over 5,000+ process hours, and the platform integrates SECS/GEM for line-level traceability and recipe control. Why it works in wafer bumping. Flux evaporation has to happen before solder deposition, and it can’t leave films or invite oxidation. Our temperature stability cuts flux cracking and kills cold-lane defects, so bump height distribution tightens and rework drops. Energy use is trimmed with pulsed emitter control and recirculating airflow, lowering cost per wafer while keeping thermal headroom for high-throughput lines. The upshot: fewer excursions, predictable maintenance windows, and consistent line-of-sight to spec. A few practical notes. The platform needs a dedicated 208–240 V, 3-phase feed and a compressed air line for the air-handling module. Plan for 12–16 inches of clearance on all sides—thermal isolation and service access matter. For qualification, run a 4-point wafer map to verify uniformity against your bump stack and reflow profile. Expect a short burn-in after install to stabilize emitter output and lock the control loop.

Bump on Global Infrared Heating Systems

Flux evaporation for wafer bump