Rohm Semiconductor is headquartered in Kyoto, Japan, and manufactures primarily at its Chikugo and Tsukuba fabs in Japan. Japan-origin Rohm products face 0% MFN + 10% Section 122 = 10% total. No Section 301 applies to Japan-origin goods. Rohm's Malaysian operations produce analog ICs also at 10% total.
Rohm Semiconductor is headquartered in Japan, but most components are manufactured in Japan, Malaysia. For US customs purposes, the COO is where the component is manufactured — not where the company is based. Declaring Japan as COO when parts ship from Japan is a customs violation.
| Country | Sec 122 | Sec 301 | Total |
|---|---|---|---|
| Japan | 10% | — | 10% |
| Malaysia | 10% | — | 10% |
* Section 301 rates shown for electronics HTS chapters (8541–8542). Rates vary by product.
| HTS Code | Description |
|---|---|
| 8541.21.0090 | SiC MOSFETs and Schottky diodes |
| 8542.39.0000 | Power management ICs and gate drivers |
| 8541.29.0000 | Zener diodes |
Rohm is one of the leading suppliers of silicon carbide (SiC) power devices, with vertically integrated SiC manufacturing from substrate growth through device fabrication at its Chikugo, Japan facility. SiC MOSFETs (SCT series) and SiC Schottky barrier diodes (RCS, RGW series) are manufactured in Japan and classified under HTS 8541.21. All Japan-origin Rohm SiC products face only the 10% Section 122 surcharge — no Section 301 applies. This compares favorably against any China-origin SiC alternatives. Rohm's SiC substrate supply chain is vertically integrated, giving it a supply security advantage for EV and industrial power conversion applications.
Rohm's primary manufacturing sites are in Japan (Chikugo, Tsukuba) with assembly and test also in Malaysia. Japan-origin Rohm products: 0% MFN + 10% Section 122 = 10% effective. Malaysia-origin Rohm products: 0% MFN + 10% Section 122 = 10% effective. No Section 301 (List 3 or List 4A) applies to Japan or Malaysia origin. Power management ICs (BD series, BU series) under HTS 8542.39 from Japan: 10% total. Gate driver ICs under HTS 8542.39 from Japan: 10% total. Buyers specifying Rohm SiC devices for EV inverter or solar converter designs can budget a flat 10% landed cost premium.
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