The 2SD424 is a silicon NPN epitaxial planar transistor designed for high-voltage switching applications. While originally manufactured by companies like Sanken, it's now often sourced through distributors or alternative manufacturers like Savantic, Inc. due to its mature lifecycle. It is used in various power supply and control circuits.

Applications

• Switching Power Supplies: Used as a switching element in various power supply designs.
• DC-DC Converters: Integrated into DC-DC conversion circuitry.
• Inverters: Used in DC to AC inverters.
• Motor Control: Can be employed in controlling the speed of DC motors.
• Lighting Control: Applied in lighting control circuits.

Features

• NPN Epitaxial Planar Transistor: Silicon NPN transistor with an epitaxial planar construction.
• High Breakdown Voltage: Capable of handling high voltage levels.
• High Collector Current: Can sustain substantial collector current.
• Fast Switching Speed: Designed for efficient switching operations.
• Low Saturation Voltage: Minimizes power dissipation when the transistor is conducting.

Benefits

• Efficient Power Conversion: Facilitates efficient switching in power electronic circuits.
• Reliable Switching: Provides consistent and reliable switching performance.
• Reduced Power Loss: Helps in minimizing power losses during switching operations.
• High-Voltage Capability: Suited for high-voltage applications, enhancing operational safety and reliability.

Specifications

• Polarity: NPN
• Material: Silicon (Si)
• Collector-Emitter Voltage (VCEO): 330V (Typical)
• Collector Current (IC): 2A (Typical)
• Peak Collector Current (ICM): 4A
• Power Dissipation (PC): 25W (Typical)
• Transition Frequency (fT): typically around 5 MHz, but varies. Consult datasheet.
• Package: TO-126

The 2SD424 is an NPN transistor that remains a viable option for high-voltage switching, offering a blend of performance and reliability for mature power supply and control applications. Despite potentially being sourced from different manufacturers now, its core characteristics remain relevant for many existing designs.