Silicon Labs is a fabless US company specializing in wireless IoT SoCs and timing ICs. TSMC-fabricated parts (Taiwan origin): 0% MFN + 10% Section 122 = 10% total. GlobalFoundries US-origin parts: 0% additional duty. No Section 301 applies to Taiwan or US origin.
Silicon Labs is headquartered in United States, but most components are manufactured in Taiwan, Singapore, 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 Taiwan is a customs violation.
| Country | Sec 122 | Sec 301 | Total |
|---|---|---|---|
| Taiwan | 10% | — | 10% |
| Singapore | 10% | — | 10% |
| United States | 10% | — | 10% |
* Section 301 rates shown for electronics HTS chapters (8541–8542). Rates vary by product.
| HTS Code | Description |
|---|---|
| 8542.31.0025 | EFR32 Zigbee/Thread/BLE SoCs, wireless MCUs |
| 8542.39.0000 | Timing ICs, IoT SoCs |
Silicon Laboratories Inc. (Silicon Labs) is a fabless semiconductor company headquartered in Austin, Texas. Its EFR32 wireless SoC family (covering Zigbee, Thread, Z-Wave, BLE, and Wi-SUN protocols) is fabricated at TSMC in Taiwan. Taiwan-origin Silicon Labs products: 0% MFN + 10% Section 122 = 10% total. No Section 301 applies. EFM32 ultra-low-power MCUs are also TSMC Taiwan-fabricated. Silicon Labs divested its infrastructure and automotive business to Skyworks in 2021, focusing on IoT and wireless. The EFR32MG21/MG24 Series 2 Zigbee/Thread SoCs are widely deployed in smart home devices and building automation, with significant US import volume.
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