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BC817-25

BC817-25 Description

The BC817-25 from Diotec Semiconductor is an NPN bipolar junction transistor (BJT) designed for high-performance switching and amplification in compact surface-mount applications. Packaged in SOT23-3, it offers a robust 45V collector-emitter breakdown voltage (V_CE) and a maximum collector current (I_C) of 800mA, making it suitable for medium-power circuits. With a transition frequency of 100MHz, it ensures efficient high-frequency operation. The device is RoHS non-compliant and carries an ECCN EAR99 classification, indicating unrestricted export control.

BC817-25 Features

• High Current Handling: Supports up to 800mA I_C, ideal for driver stages and load switching.
• Low Saturation Voltage: 700mV max @ 50mA base current (I_B) and 500mA I_C, minimizing power loss in saturated switching.
• High DC Current Gain (h_FE): 160 (min) @ 100mA, 1V, ensuring strong signal amplification.
• Surface-Mount Design: SOT23-3 package enables compact PCB layouts, suitable for space-constrained designs.
• Wide Operating Range: -55°C to +150°C junction temperature tolerance for robust performance in varied environments.

BC817-25 Applications

• Switching Circuits: Relay drivers, LED drivers, and power management due to low V_CE(sat).
• Amplification: Audio preamps, signal conditioning, and sensor interfaces leveraging high h_FE.
• Portable Electronics: Battery-operated devices benefiting from its 310mW power dissipation and small footprint.
• Automotive Modules: Non-critical subsystems where 45V breakdown voltage provides sufficient headroom.

Conclusion of BC817-25

The BC817-25 excels in high-efficiency switching and amplification with its low saturation voltage, high gain, and compact form factor. While it lacks RoHS compliance, its 100MHz bandwidth and 800mA current rating make it a versatile choice for industrial, consumer, and automotive electronics. Engineers will appreciate its balance of performance and cost-effectiveness in medium-power analog and digital designs.