Spansion (Thailand) Ltd. was a Thailand-incorporated manufacturing subsidiary of Spansion, Inc., the Sunnyvale, California flash-memory maker (NYSE: CODE) created in 2003 from the AMD–Fujitsu flash joint venture. Its plant at 229 Moo 4 Changwattana Road, Pakkred, Nonthaburi, established in 1990, was Spansion's largest back-end site, with roughly 877 employees as of May 2011 per a Spansion Japan product-change notice. Spansion was acquired by Cypress Semiconductor in an all-stock merger announced December 2014 (valued around $4 billion); Infineon Technologies AG then bought Cypress in 2020, so the surviving Spansion entities are Infineon subsidiaries (Bursa Malaysia filings).
Operations. The Thai entity performed semiconductor assembly, test, marking and packaging (TSOP, BGA, SOIC and MCP packages) — back-end manufacturing rather than product marketing. Parent Spansion's line card covered parallel and serial NOR flash, lower-density NAND, microcontrollers, and analog/mixed-signal and power-management ICs (Investing.com profile; merger materials).
Litigation posture. Spansion (Thailand) appears once in the tracked data, as a defendant and never as plaintiff — consistent with an operating manufacturer named as a respondent because its chips were the imported accused articles. No plaintiff-side or Eastern District of Texas activity appears in the data.
Notable case. Macronix International Co., Ltd. et al. v. Spansion, Inc. et al. (filed December 27, 2013), the Section 337 complaint instituted as USITC Inv. No. 337-TA-909, "Certain Non-Volatile Memory Devices and Products Containing the Same." Macronix asserted its memory patents against Spansion chips and downstream customers (Beats, Delphi, Harman, Ruckus, Tellabs). It was one front in a broader two-way Macronix–Spansion dispute — including Spansion's own 337-TA-916 action and parallel district-court and German suits — settled by mutual dismissal and cross-license in January 2015 (Cypress 8-K/A).
Context. In September 2025, Malaysian Pacific Industries agreed to buy Infineon Technologies (Thailand) Ltd from Spansion LLC, Spansion Inc. and Cypress for about US$77.9 million. The deal closed February 4, 2026, and the entity became Carsem Semiconductor (Bangkok) Ltd. That Nonthaburi seller entity shares the tracked address and appears to be Spansion (Thailand) Ltd.'s successor.