Allegro MicroSystems manufactures magnetic sensors and motor drivers. US-origin products face 0% additional duty. Japan-origin: 10% Section 122. Thailand-origin: 10% Section 122. No Section 301 applies. Allegro dominates automotive current sensing with its ACS series.
Allegro MicroSystems is headquartered in United States, but most components are manufactured in United States, Japan, Thailand. 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% |
| Japan | 10% | — | 10% |
| Thailand | 10% | — | 10% |
* Section 301 rates shown for electronics HTS chapters (8541–8542). Rates vary by product.
| HTS Code | Description |
|---|---|
| 8542.39.0000 | Hall-effect sensors, motor drivers, gate drivers |
| 8543.70.9650 | Magnetic position sensors (ACS current sensors) |
Allegro MicroSystems (formerly a Sanken Electric subsidiary, now independent/Littelfuse-owned) operates its primary wafer fab in Manchester, New Hampshire (US). US-fabricated and US-assembled Allegro products carry US COO and face zero additional tariff. Japan-origin Allegro parts (Sunagawa fab output): 0% MFN + 10% Section 122 = 10%. Thailand back-end assembled parts: 10%. No Section 301 applies to Allegro's manufacturing base. Allegro's ACS current sensor family (HTS 8543.70) is the market-leading solution for EV battery management and motor phase current measurement, with applications requiring multiple sensors per vehicle — making landed cost optimization relevant at automotive volumes.
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