ramp to volume

**Ramp to Volume** is the **phase of increasing production output from pilot levels to full-volume manufacturing** — systematically scaling wafer starts, improving yield, qualifying equipment capacity, and establishing supply chain reliability to meet customer demand at target volume. **Ramp Phases** - **Early Ramp**: 100-1000 WSPM (wafer starts per month) — focus on yield improvement and process stabilization. - **Mid Ramp**: 1000-5000+ WSPM — scale equipment, train operators, establish supply chain. - **Full Volume**: Target WSPM achieved — yield at or near mature levels, all metrics stable. - **Yield Ramp**: Yield improvement typically follows a learning curve — each doubling of production adds ~5-10% yield. **Why It Matters** - **Revenue**: Faster ramp = earlier revenue — time-to-volume directly impacts business profitability. - **Capital**: Full-volume production requires $10-20B+ capital investment — equipment must be installed, qualified, and ramped. - **Competition**: First to volume wins market share — ramp speed is a competitive differentiator. **Ramp to Volume** is **scaling up the factory** — the critical transition from prototype to mass production that determines commercial success.