Littelfuse manufactures circuit protection components across multiple countries. Mexico-origin Littelfuse products are USMCA-exempt (0% additional duty). Philippines and Lithuania-origin: 10% Section 122. China-origin TVS diodes and MOVs: 25% Section 301 + 10% Section 122 = 35% total.
Littelfuse is headquartered in United States, but most components are manufactured in Mexico, China, Philippines, Lithuania. 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 Mexico is a customs violation.
Assembly and test (USMCA)
Assembly and test
Assembly and test
Assembly and test
| Country | Sec 122 | Sec 301 | Total |
|---|---|---|---|
| Mexico | 10% | — | 10% |
| China | 10% | 50% | 60% |
| Philippines | 10% | — | 10% |
| Lithuania | 10% | — | 10% |
* Section 301 rates shown for electronics HTS chapters (8541–8542). Rates vary by product.
| HTS Code | Description |
|---|---|
| 8536.10.0040 | Fuses (0154, 0251 series) |
| 8536.90.8085 | Circuit protection modules |
| 8541.10.0090 | TVS diodes (SMBJ, P6KE series) |
| 8504.10.0000 | Varistors (V series MOVs) |
Littelfuse's multi-country manufacturing creates a mixed tariff profile. Mexico-origin Littelfuse products (assembled at Matamoros and Monterrey) qualify for USMCA and face 0% additional duty — this is the best-case sourcing scenario for US importers. Philippines-origin (Laguna facility): 10% Section 122. Lithuania-origin: 10% Section 122. China-origin Littelfuse products (Wuxi, Shanghai): HTS 8536 fuses face 25% Section 301 + 10% Section 122 = 35% total; HTS 8541.10 TVS diodes from China face 50% Section 301 + 10% Section 122 = 60% total. Buyers should request COO at time of order to determine applicable duty rate.
Enter any Littelfuse part number to get the COO, HTS code, and full duty calculation including MPF and HMF.
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