Semtech Buys Dedicated SiGe Capacity at Tower for AI Data Center Optics

Semtech will invest in dedicated silicon germanium (SiGe) wafer capacity at Tower Semiconductor under an expanded multi-year agreement, extending a manufacturing partnership that has already run for 20 years. The secured capacity spans Tower fabs in the United States, Israel and Japan, giving Semtech supply assurance across three regions as demand for AI data center optical interconnect components grows.

The deal addresses what is becoming AI's next constraint: power spent moving data rather than computing it. As AI clusters scale across racks, rows and campuses, the energy cost of moving each bit increasingly determines how much useful work each accelerator delivers. Every step in the speed roadmap — from 800G to 1.6T and on to 3.2T — raises requirements for bandwidth, reach and power per bit, and increases the weight of the high-speed analog front end that drives and receives the signal.

What does the agreement cover?

Semtech's signal integrity product line runs on Tower's SiGe process technology. The portfolio includes:

• Transimpedance amplifiers (TIAs)
• Modulator drivers and laser drivers
• Linear equalizers

These components serve a broad set of interconnect architectures: fully retimed optics (FRO), linear pluggable optics (LPO), linear receive optics (LRO), near-packaged optics (NPO), eXtra-dense pluggable optics (XPO), linear equalizers mounted on PCB, and active copper cables (ACC). Semtech believes the range positions it to address copper links inside the rack and optical links across the data center as the industry shifts to its next generation of architectures.

The capacity commitment builds on current production. Semtech expects demand for its SiGe-based products to grow across a broadening base of customer programs and end markets, and the agreement adds supply resilience and geographic diversification to its manufacturing strategy. The two companies also work jointly on a technology roadmap, not just capacity, aimed at product leadership in multi-generational AI data center interconnects.

What has the partnership already produced?

Semtech received the Optical Component Innovation (Chip/Wafer) award at the European Conference on Optical Communication (ECOC) 2026 for its 224 Gbps per Lane TIA Family for Linear Pluggable Optics, built on Tower's SiGe technology. The award offers a concrete measure of where the collaboration stands today: a qualified analog front end already operating at 224 Gbps per lane, the per-lane speed that underpins next-generation module rates.

What did the executives say?

"Connectivity is now a primary factor in how far AI systems can scale," said Hong Hou, Semtech President and CEO. "Our customers are scaling interconnect bandwidth quickly and at massive scale. Meeting that demand requires long-term capacity planning and commitment with our manufacturing partners. Tower has been a trusted partner to Semtech for 20 years, and we are very pleased with our partnership agreement that secures dedicated SiGe capacity across three regions to grow across copper and optical interconnects, from 800G and 1.6T today through 3.2T and beyond."

Russell Ellwanger, CEO of Tower Semiconductor, framed the deal as preparation ahead of demand rather than a reaction to it. "By qualifying these solutions well ahead of market need, we both stand fully prepared for immediate implementation as the market moves into these generations," Ellwanger said. He added that the companies are "the key drivers of the technologies carrying the market forward, ensuring a continual expansion of our already leading market share in optical transceiver connectivity within this high-growth market."

Why does the timing matter?

The agreement locks in analog foundry capacity before the 1.6T and 3.2T transitions tighten supply. Securing dedicated SiGe wafers across three geographies also hedges Semtech against single-site disruption in a segment where the analog front end increasingly sets the power budget of the whole link. With qualified 224 Gbps-per-lane products in hand and capacity reserved across US, Israeli and Japanese fabs, Semtech and Tower have positioned themselves for the interconnect speed steps now moving from roadmap to deployment.