Diosdado Banatao

Diosdado "Dado" Banatao (May 23, 1946 – December 25, 2025) was one of Silicon Valley's most influential semiconductor pioneers and a rags-to-riches figure often called the "Bill Gates of the Philippines" and a "father of the semiconductor." Born to a rice farmer in Iguig, Cagayan Province, Philippines, he earned a B.S. in Electrical Engineering (cum laude) from the Mapúa Institute of Technology, relocated to the United States in 1968, worked as a design engineer at Boeing on the 747 program, and then earned a master's in electrical engineering and computer science from Stanford University (1972), concentrating on computer architecture. He was a member of the Homebrew Computer Club, where he crossed paths with Steve Jobs and Steve Wozniak.

His engineering career spanned National Semiconductor, Intersil, Commodore International, and Seeq Technology, where he is credited with developing the first 10-Mbit Ethernet CMOS chip (and the first single-chip 16-bit CMOS Ethernet transceiver). He went on to become a three-time startup founder: Mostron (1984), Chips and Technologies (1985, co-founded with Gordon Campbell and Ron Yara), which built the world's first single-chip PC chipset compatible with the IBM PC/XT and PC/AT and was later acquired by Intel; and S3 Graphics (1989), which pioneered GUI/graphics-accelerator chips and became one of the most profitable technology companies of the early 1990s after its 1993 IPO. He also served as CEO of Ikanos Communications around 2010.

Banatao moved into venture capital as a venture partner at the Mayfield Fund (roughly 1997–2000) before founding Tallwood Venture Capital in 2000, reportedly seeding it with a large amount of his own capital and later raising institutional funds (Tallwood II, ~$180M). At Tallwood he invested in and mentored semiconductor and communications startups, drawing on his operator's perspective to back "hard-to-do" chip technologies for computing, communications, and consumer platforms. He held board seats at numerous portfolio companies including Inphi, SiRF Technology, Wilocity, T-RAM Semiconductor, Alphion, Quintic, and Integrated Micro-Electronics.

Beyond investing, Banatao was a prominent philanthropist and mentor. He endowed CITRIS and the Banatao Institute at the University of California, chaired the Philippine Development Foundation (PhilDev), and funded scholarships for Filipino and Filipino-American engineering students through the Dado Banatao Educational Foundation and the Banatao Filipino American Fund. He appeared on the Forbes Midas List for five consecutive years (2002–2006) and received honors including the Ellis Island Medal of Honor, EY Entrepreneur of the Year, and the Ramon V. del Rosario award (2018).

• Deep-tech semiconductors first. Tallwood was built to invest in "unique and hard-to-do semiconductor technology solutions for computing, communication, and consumer platforms" — a deliberately narrow, technically demanding mandate rather than broad software/consumer investing.
• Early-stage, hands-on. He focused on early-stage companies addressing complex engineering challenges, emphasizing hands-on mentorship and a long-term perspective rather than quick flips.
• Operator's lens on technical teams. As a three-time founder and chip designer himself, he evaluated deals through an engineer's eyes — backing founders solving genuinely difficult platform-scale problems in communications, networking, and computing silicon.
• Concentrated conviction with own capital. Tallwood was notably self-financed at inception, signaling a high-conviction, concentrated style over spray-and-pray angel investing.
• Mission-adjacent bets. Later interests extended to areas his philanthropy touched — clean/renewable energy technology and broadening access to advanced technology — alongside core semiconductors.