BD139 Medium Power NPN Transistor from China
BD139 is a medium-power NPN transistor (80V/1.5A) for audio drivers and switching applications. HTS 8541.29.00 classification. Popular in European amplifier designs.
Duty Rate — China → United States
50%
Rate breakdown
9903.91.0550%Effective with respect to entries on or after January 1, 2025, articles the product of China, as provided for in subdivision (f) of U.S. note 31 to this subchapter
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Specify thermal resistance for heat sink design requirements
• Include safe operating area (SOA) for pulsed audio applications
• Comply with automotive AEC-Q101 qualification if specified