2N6403G Littelfuse SCR 400V 16A TO220AB

The 2N6403G is a Silicon Controlled Rectifier (SCR) produced by Littelfuse. Here are the key specifications and details about this component:


  • Manufacturer: Littelfuse
  • Part Number: 2N6403G
  • Type: Silicon Controlled Rectifier (SCR)
  • Voltage Rating: 400V
  • Current Rating: 16A
  • Package: TO-220AB (Through-Hole, 3-pin)
  • DataSheet 2N6403G PDF

Key Features:

  1. SCR: The Silicon Controlled Rectifier is a four-layer solid-state current-controlled electrical switch capable of handling high voltages and currents.

  2. Voltage and Current Ratings: This SCR is rated for a maximum voltage of 400V and a maximum current of 16A, making it suitable for medium-power applications.

  3. Package Type (TO-220AB): The TO-220AB package is a through-hole package with three pins that allow for easy mounting on a circuit board.

Main Specifications and Usage:

  • Voltage Regulation: SCRs are commonly used for switching and controlling AC power, motor control, power supplies, and other high-power applications.

  • Overvoltage Protection: They can also be used in crowbar circuits to protect sensitive components from overvoltage conditions.

  • Switching Applications: SCRs are widely employed in situations where high-power switching is required and where the device needs to remain in an "on" state until reset manually or through control signals.

Working Principle:

When a small current is applied to the gate of the SCR, the device turns on and allows a larger current to flow through it until the current drops below a certain threshold or a reverse voltage is applied.

Benefits and Considerations:

  • Reliability: SCRs are known for their reliability and ruggedness, suitable for demanding applications.

  • Efficiency: They have low conduction losses and can handle high currents efficiently.

  • Thermal Considerations: Thermal management is important as they can generate heat during operation.

Typical Applications:

  • Motor Control: SCRs are commonly used in motor control circuits.

  • Light Dimming: They are used in light dimming circuits and power control applications.

  • Heating Systems: SCRs are found in applications like heating systems where power regulation is critical.


  • Heat Sink: Consider using a heat sink to manage heat dissipation, especially in high-power applications.

  • Gate Signal: Apply the appropriate gate signal to turn the SCR on at the intended time.

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