Luminary Micro was a semiconductor company that designed ARM Cortex-M3 based microcontrollers before being acquired by Texas Instruments in 2009. They pioneered the Stellaris family of 32-bit microcontrollers for embedded applications.
Luminary Micro is headquartered in United States, but most components are manufactured in United States. For US customs purposes, the COO is where the component is manufactured — not where the company is based. Declaring United States as COO when parts ship from United States is a customs violation.
| Country | Sec 122 | Sec 301 | Total |
|---|---|---|---|
| 🇺🇸 United States | 10% | — | 10% |
* Section 301 rates shown for electronics HTS chapters (8541–8542). Rates vary by product.
| HTS Code | Description |
|---|---|
| 8542.31.0025 | Microcontrollers |
For US importers, the country of origin (COO) of a Luminary Micro component determines which tariff layers apply at the border — not where Luminary Micro is headquartered. Under US customs law, COO is the country where the component was manufactured or substantially transformed, which is typically a fabrication or assembly facility rather than a corporate headquarters. Luminary Micro components manufactured in United States carry an effective US import duty of 10%, reflecting the applicable MFN base rate plus any Section 301 or Section 122 surcharges in effect.
The total US import duty on Luminary Micro components is calculated as a stack of applicable tariff layers: (1) the MFN (most-favored-nation) base rate from the USITC HTS schedule — typically 0% for electronic components in HTS chapters 8541–8542; (2) Section 122 global surcharge of 10%, applicable to all countries since May 2025; (3) Section 301 China-specific surcharges of 50% for semiconductors and ICs (HTS 8541–8542) or 25% for passive components, applicable only to China-origin goods; and (4) Merchandise Processing Fee (MPF) of 0.3464% of customs value, with a minimum of $32.71 and maximum of $634.62 per entry. For Luminary Micro components manufactured in United States, the combined effective rate is 10%. Electronics procurement teams should verify the specific COO at the lot or date-code level, as some manufacturers source from multiple facilities.
Correct HTS (Harmonized Tariff Schedule) classification is required for accurate duty calculation and CBP entry. Electronic components fall across several HTS chapters: integrated circuits (microcontrollers, memory, analog ICs) under HTS 8542; discrete semiconductors (diodes, transistors, MOSFETs) under HTS 8541; passive components including capacitors under HTS 8532, resistors under HTS 8533, and inductors under HTS 8504. Misclassification exposes importers to CBP penalties and potential back-duties. If you are unsure of the correct HTS code for a specific Luminary Micro part number, use TariffTracker's part number lookup to get a classification recommendation based on distributor and manufacturer data cross-referenced with the USITC tariff schedule.
Enter any Luminary Micro part number to get the COO, HTS code, and full duty calculation including MPF and HMF.
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