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After Lucent Technologies acquired VTC Inc., its semiconductor operation was recast in 2000 as PolarFab, an independent, U.S.-owned foundry focused on BiCMOS and mixed-signal chips. Rather than compete directly in the price-pressured disk-drive IC business, PolarFab aimed to manufacture chips for multiple customers and support them with design, testing and engineering services. It later became Polar Semiconductor under new ownership.
What happened to VTC’s semiconductor operation?
Lucent acquired VTC, including its intellectual property and 232 design and product engineers, according to 2000 trade coverage. The remaining operation became PolarFab in 2000. Polar Semiconductor’s company history records the transition and says the new foundry served more than 50 customers worldwide.
PolarFab was presented as an independent, U.S.-owned pure-play foundry: it would manufacture chips for customers rather than sell its own competing line of semiconductor products. The shift was a strategic response to pricing pressure in disk-drive ICs. PolarFab president and COO Gregory Peterson said VTC could compete in head preamps when pricing and customer expectations were “reasonable”; a foundry serving several customers offered a different way to sustain manufacturing economics.
What did “pure-play BiCMOS foundry” mean?
A pure-play foundry manufactures chips for other companies. BiCMOS combines bipolar transistors and CMOS circuitry on the same substrate. In PolarFab’s target applications, bipolar devices could provide speed and noise immunity for analog front ends, while CMOS handled digital functions. That mix suited communications interfaces, RF circuits, power management, Bluetooth, disk-drive read channels and other mixed-signal designs.
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This specialization distinguished PolarFab’s pitch from a conventional commodity-CMOS foundry: it was built around analog, RF and mixed-signal requirements, not a race to offer the newest logic node. Its 2001 Polar35 process was a 0.35-micron offering for analog, BiCMOS, CMOS and mixed-signal ICs, with an 8-inch fab. PolarFab reported RF bipolar NPN capability up to 28 GHz fT, along with Cadence process-design-kit support and its PolarShuttle multi-project-wafer program. Those are historical Polar35 specifications, not claims about current process offerings.
What services and capacity did PolarFab offer at launch?
PolarFab’s model extended beyond wafer fabrication. It offered prototype assembly, wafer probing, final package testing, yield enhancement and engineering help with electrostatic discharge and latch-up issues. Peterson described the remaining 420 employees as providing “hand-holding” services to designers.
Trade reports from 2000 describe capacity in two ways. PolarFab said it could make more than 10,000 wafers per month at launch, with plans to reach at least 17,000 monthly by early 2001 and 22,000 by the second quarter of 2001. It also reported launch output of 30,000 six-inch wafers per quarter, with expansion plans for 35,000 and then 40,000 quarterly. These are period-specific company figures and plans, not verified current output. Peterson described the facility as 170,000 square feet.
Who were PolarFab’s customers, and where did it compete?
The 2000 launch coverage named Seagate, Western Digital, Maxtor and Samsung among VTC’s disk-drive customers, and Cirrus Logic and Lucent among its chip-supplier customers. It also reported that PolarFab had contracts with Lucent’s Microelectronics Group and Maxim Integrated Products. Those named relationships describe the launch period and should not be read as a current customer list.
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In 2001, PolarFab positioned itself in analog and mixed-signal foundry work against Taiwan Semiconductor Manufacturing and X-Fab. Its sales director Jerry Thimsen summarized its focus as RF, power management, Bluetooth and related applications. The competitive distinction was therefore specialization and engineering support, rather than a direct comparison with leading-edge logic manufacturing.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How did PolarFab become Polar Semiconductor?
Polar Semiconductor’s official history says the company completed a 200mm fab in 2001 and entered a foundry agreement with Allegro Microsystems. Sanken Electric acquired the business in 2005, after which it adopted the Polar Semiconductor name. A 2005 acquisition announcement put the purchase price at $83 million and reported 45 customers at that time; those figures refer to the transaction period, not present-day scale.
The company describes itself today as an independent technology-development and wafer-manufacturing center. Its current capabilities include GaN, MOSFET, IGBT and BCD technologies. Those capabilities reflect the company’s later evolution and should not be attributed to PolarFab’s original 2000 offering.
What the history does—and does not—establish
The transition shows how VTC’s manufacturing operation moved from serving an in-house product business toward contract manufacturing for outside chip companies. The available historical reporting provides launch-era capacity, process and customer examples, while the company history supplies the ownership and facility timeline. It does not establish Polar Semiconductor’s 2026 revenue, fab utilization or complete current customer roster.
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