The DTD123YS is a digital transistor (BJT) manufactured by Rohm Semiconductor. This pre-biased transistor integrates bias resistors into a single package, simplifying circuit design and reducing component count. It's designed for use in various switching applications where a microcontroller or digital logic output directly controls a load.

Applications

• Digital circuit switching
• Inverter circuits
• Load driving from microcontroller outputs
• General-purpose amplification and switching

Features

• Built-in bias resistors (R1=2.2kΩ, R2=47kΩ)
• Reduces component count
• Simplifies circuit design
• Available in a small surface-mount package (SOT-346)
• NPN transistor

Benefits

• Saves board space due to integrated resistors
• Lowers assembly costs by reducing the number of components to place
• Reduces design time due to simplified biasing requirements
• Improves circuit reliability by reducing external wiring

Additional Details

The DTD123YS has a collector-emitter voltage (Vceo) of 50V and a collector current (Ic) of 100mA. The power dissipation is rated at 200mW. The input resistor (R1) is 2.2kΩ and the resistor ratio (R2/R1) is 21.3. The transistor is typically used in applications requiring low to medium current switching. Its small size and integrated resistors make it suitable for portable devices and other space-constrained applications.