onsemi (formerly ON Semiconductor) is headquartered in Scottsdale, Arizona, but its primary manufacturing is in the Czech Republic (Rožnov pod Radhoštěm), Philippines, Malaysia, and China. Czech Republic-origin onsemi parts face only 10% (EU/Section 122). Philippines/Malaysia also 10%. China-origin face ~60% (HTS 8541/8542 power semiconductors).
onsemi is headquartered in United States, but most components are manufactured in Czech Republic, Philippines, China, Malaysia. 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 Czech Republic is a customs violation.
MOSFETs, ESD protection, diodes — wafer fab & assembly
Assembly and test
Assembly and test
Assembly and test
| Country | Sec 122 | Sec 301 | Total |
|---|---|---|---|
| Czech Republic | 10% | — | 10% |
| Philippines | 10% | — | 10% |
| China | 10% | 50% | 60% |
| Malaysia | 10% | — | 10% |
* Section 301 rates shown for electronics HTS chapters (8541–8542). Rates vary by product.
| HTS Code | Description |
|---|---|
| 8541.21.0000 | Small signal transistors |
| 8541.29.0000 | Power MOSFETs |
| 8542.39.0000 | Power management ICs |
| 8541.10.0000 | Diodes, ESD protection |
onsemi operates an integrated device manufacturer (IDM) model with wafer fabrication and back-end operations across multiple geographies. The Rožnov pod Radhoštěm facility in the Czech Republic is a strategically significant integrated site performing both wafer fabrication and packaging — one of the few European semiconductor fabs producing power MOSFETs, ESD protection devices, and discrete semiconductors at scale. The Philippines (Carmona and Taguig sites) and Malaysia (Seremban) handle assembly and test for a broad range of power semiconductors, analog ICs, and discrete devices. China assembly handles some commodity packages. For US customs, Czech Republic-origin onsemi parts do not attract Section 301 duties, giving them a structural tariff advantage.
onsemi's product portfolio spans HTS 8541.21.0000 (power MOSFETs, small signal transistors), 8541.10.0000 (Schottky and rectifier diodes), 8542.39.0000 (power management ICs, NCP/NCS families), and 8541.40.9500 (photovoltaic devices, image sensors). Czech Republic-origin parts: 10% effective rate (Section 122 only). Philippines and Malaysia-origin parts: 10% effective rate. China-origin parts: approximately 60% effective rate (10% Section 122 + 50% Section 301 for HTS 8541/8542 power semiconductors). The ELi Elite intelligent power module (IPM) line and Aura power modules primarily assemble in the Czech Republic and Philippines.
onsemi has aggressively repositioned as a supplier to EV and industrial power conversion markets, with silicon carbide (SiC) MOSFETs and modules as primary growth products. The EliteSiC family (1200V SiC MOSFETs and diodes) is manufactured at the Hudson, NH facility (US COO, no tariff) and partially at East Fishkill, NY. SiC wafers are grown at onsemi's South Korea and US facilities. For buyers designing EV inverters or solar string inverters, US-manufactured SiC MOSFETs offer zero tariff exposure — a meaningful advantage over Chinese SiC suppliers facing 60%+ duties. However, onsemi's legacy silicon MOSFET and IGBT lines remain predominantly assembled offshore.
For standard onsemi power MOSFET lines (NTMFS, FDS, BSZ series), Czech Republic and Philippines COO are the most common. Importers should request onsemi's Certificate of Origin documentation, particularly for high-volume commodity parts where multiple back-end sites may be qualified. Parts bearing the 'NCV' prefix (AEC-Q100 automotive qualified) are typically sourced from Czech Republic or Philippines, both 10% rate. The NCP power management family and linear regulators in DIP/SOP packaging often route through Philippines. China-assembled onsemi parts (some commodity SOT packages) should be flagged in customs classification for the additional Section 301 levy.
onsemi has actively reduced its China manufacturing exposure over 2022–2025, partially in response to US-China trade tensions and customer requests for non-China COO supply. The company's 2022 acquisition of GTAT's SiC substrate assets and continued investment in the Czech Republic facility reflect a deliberate de-risking strategy. Buyers building multi-year supply agreements for power semiconductors should confirm onsemi's current site qualification for each part number, as factory transfers between Czech Republic and Philippines can alter lead times without necessarily changing the tariff rate.
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