Fan out wafer level packaging heater

Tue, 30 Jun 2026 01:37:47 +0800

On the line, fan-out redistribution is all about thermal control. One hotspot while the epoxy mold compound cures, one drift during the photoresist bake, and you’re suddenly fighting line-width control and bump coplanarity. The heater has to deliver repeatable temperature—across every die, every lot, every shift. What actually matters We built the fan-out WLP heater around short-wave infrared halogen quartz emitters. It’s surface-driven heating that’s fast, so you keep the thermal budget tight. Across the active zone, you get ±0.1°C uniformity, measured on bare silicon with mapped thermocouples. Response is in seconds, which matters when you’re running tight closed-loop control on soft bake and hard bake. Cleanroom Class 1–100 is supported by a low-outgassing design and zero particle generation under steady operation. In the field, it runs 24/7, with thousands of hours between maintenance intervals. Why it holds up in production In redistribution, you bake photoresist, cure underfill, then reflow bumps—each step is a yield gate. The heater stabilizes the thermal profile so critical dimension stays in spec and underfill voids stay minimal. Tight uniformity cuts down on edge-of-wafer rejects, and repeatability makes lot-to-lot transfers straightforward. Energy use drops because the quartz emitters heat the target area directly, not the whole chamber. The result: more good die per wafer, fewer reworks, and uptime you can plan around. Things to get right up front The heater drops into existing coater/bake tracks and mold presses, but the mounting footprint and aperture have to match the tool. You’ll need a dedicated power feed and Class-compliant shielding for EMI-sensitive areas. When setpoints climb above 250°C, pay attention to the quartz and ceramic interfaces—we provide the thermal derating curve. Plan the integration early, and the process window opens fast.

Level on Indoor Warm IR Solutions

Fan out wafer level packaging heater