Level on Infrared Quartz Heating Systems

Fan out wafer level packaging heater

Tue, 30 Jun 2026 04:54:05 +0800

On the FO-WLP line, the bake step is where yield quietly slips away. A soft bake that drifts by 2°C throws off the photoresist profile. Run the hard bake hot, and you’re asking for underfill voids and warpage. You’re fighting for thermal uniformity across the reconstituted wafer while the clock keeps ticking. What matters, technically We built the fan-out wafer level packaging heater for the bake ovens and hot plates that sit between lithography and mold. Short-wave halogen emitters give you fast, direct response, and we hold wafer-level uniformity to ±0.1°C across the active area. The heater body is quartz and high-purity ceramic, so particle generation stays near zero in Class 1–100 cleanrooms. Temperature repeatability is ±0.2°C shot-to-shot, so your soft bake and hard bake profiles stay locked to spec. Control is PID, with SECS/GEM readiness, so you get traceable setpoints, ramp rates, and soak times. Why this works in FO-WLP FO-WLP stacks heterogeneous dies in mold compound, then redistributes I/O. The thermal budget is tight: you have to clear photoresist activation windows without driving copper migration or inducing CTE stress. This heater holds the bake curve precisely, so critical dimension control improves and scum/footing risk drops. Tight uniformity cuts edge-of-field rejects on the RDL, and repeatability shortens qualification cycles. Energy use falls because the emitter heats on demand with minimal thermal mass. It’s built for 24/7 operation, counting on planned maintenance windows, not unplanned downtime. A few practical notes The heater fits most FO-WLP hot-plate platforms, but integration comes down to mechanical envelope, vacuum chucking, and exhaust routing. Match voltage and connector type to your tool. After a lamp replacement, there’s a short warm-up stabilization period—schedule it into PM so bake profiles stay in spec.

Wafer level CSP (Chip Scale Package) heater

Tue, 09 Jun 2026 03:28:42 +0800

Out on the packaging floor, a CSP heater going down stops the whole line. Every minute of unplanned downtime means scrapped wafers and margin going up in smoke. We built our wafer-level CSP heater to run 7×24 without throwing a fault, because when you’re chasing yield, uptime comes first. What matters, technically We spec thermal uniformity at ±0.1°C across the wafer, so every photoresist soft bake and hard bake lands inside the thermal budget—no edge bias. It’s cleanroom-ready from Class 1 to Class 100, and the heater geometry is engineered for zero particle generation. No extra scrubs. No yield hits. Repeatability is locked in by a stable, closed-loop temperature profile that holds setpoints cycle after cycle. Plan on service life measured in tens of thousands of hours, not thousands, with maintenance windows you can actually predict. Why this works in wafer-level CSP In wafer-level CSP, temperature repeatability is what buys you bond integrity, warpage control, and consistent line widths after lithography. You can tighten spec limits without chasing drift. Energy use drops because the heater hits setpoint fast, then idles clean. Unplanned stops fall when the unit survives continuous operation without thermal fatigue or hot-spot failures. Fewer rework lots. Stable particle counts. The process behaves the same at shift change as it does at midnight. Here’s what you need to know Installation means matching the chamber footprint and confirming connector compatibility—we provide the interface drawings and pin map. The heater only performs within spec when chamber exhaust and coolant flow match the rated conditions. Airflow changes will shift uniformity. Set the first preventive check at 2,000 hours to verify temperature calibration and cleanliness. After that, you can stretch intervals based on your own measured drift data.