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BC817-40

BC817-40 Description

The BC817-40 from Diotec Semiconductor is a high-performance NPN bipolar junction transistor (BJT) designed for surface-mount applications. Packaged in a compact SOT-23 form factor, it offers a robust 45V collector-emitter breakdown voltage (Vceo) and a maximum collector current (Ic) of 800mA, making it suitable for medium-power switching and amplification tasks. With a transition frequency (ft) of 100MHz, it ensures efficient operation in high-frequency circuits. The device is characterized by low saturation voltage (700mV @ 50mA, 500mA), enhancing energy efficiency in switching applications.

BC817-40 Features

• High Current Handling: Supports up to 800mA Ic, ideal for driving relays, LEDs, and small motors.
• Low Saturation Voltage: 700mV @ 500mA minimizes power loss in switching applications.
• High DC Current Gain (hFE): 250 @ 100mA, 1V ensures strong signal amplification.
• Surface-Mount Design: SOT-23 package enables compact PCB layouts.
• Wide Voltage Range: 45V Vceo accommodates diverse circuit requirements.
• RoHS & REACH Compliance: Meets environmental standards, though RoHS status is "Not Applicable" per manufacturer specifications.
• High Transition Frequency: 100MHz ft suits RF and fast-switching applications.

BC817-40 Applications

• Switching Circuits: Relay drivers, LED drivers, and load switches due to low Vce(sat).
• Amplification: Audio preamps, signal conditioning, and sensor interfaces leveraging high hFE.
• High-Frequency Systems: RF modules and oscillator circuits benefiting from 100MHz ft.
• Power Management: DC-DC converters and voltage regulators requiring efficient switching.
• Consumer Electronics: Portable devices, where compact SOT-23 packaging is critical.

Conclusion of BC817-40

The BC817-40 stands out as a versatile NPN BJT for surface-mount designs, combining high current capability, low saturation voltage, and excellent gain. Its 100MHz transition frequency and 45V voltage tolerance make it a preferred choice for switching, amplification, and RF applications. While lacking RoHS certification, its performance and Diotec Semiconductor's reliability ensure broad adoption in consumer electronics, industrial controls, and communication systems. Engineers value its balance of power efficiency, compact size, and cost-effectiveness for modern PCB designs.