BD681 - N­DARL. 100V 4A

BD681 is a high-gain silicon NPN Darlington power transistor designed for medium-power linear and switching applications, such as audio amplifiers and motor drivers. As of March 2026, individual units typically range from €0.39 to €3.00 depending on the retailer and quantity purchased. 

Technical Specifications

The BD681 features the following key specifications:

• Type: NPN Darlington Transistor.
• Collector-Emitter Voltage ( VCEO): 100V (Maximum).
• Collector Current ( IC): 4A (Continuous).
• Power Dissipation ( Ptot): 40W at a case temperature of 25°C.
• DC Current Gain ( hFE): Minimum 750 at  IC=1.5A .
• Package Type: SOT-32 (also referred to as TO-126).