Diodes Incorporated

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The DRDC3105 is an integrated solid-state DC relay driver that can switch inductive loads. It provides a robust driver interface by acting as a buffer stage between sensitive logic circuits and that of 3 to 6V DC inductive relay coils. With a low input drive current requirement, the DRDC3105 only has slight loading on the input circuitry and it will provide good transient isolation between output and input channels. The output switch is guaranteed by design to go open-circuit and fall into the off-state condition when input drive is lost or disconnected. In the industry standard SOT23 and SOT26, the DRDC3105 comes as a single or dual die which can replace three to six individual discrete components within a single integrated package, including a Zener across the output. The Zener will clamp at 6.6V to sink inductive currents to ground which will reduce EMI noise in the system. By integrating the Zener, the DRDC3105 eliminates the need for an external free-wheeling diode and allows the driving of inductive loads such as relays, solenoids, incandescent lamps, and small DC motors.


  • Inductive load driver capable of driving 3 to 6V DC coils
  • Optimized to switch inductive loads from supply of 3 to 5V with the capability to drive coils up to 2.5W from a 5V rail
  • Fully integrated into a single SOT23 or dual SOT26 package to minimize footprint area and reduce number of components
  • Includes Zener across output to reduce EMI noise
  • Internal low saturation BJT to reduce power dissipation in driving high currents into the coil
  • Output guaranteed to be in off-state condition during no input
  • Near – Zero quiescent supply current in off-state condition with minimal leakage
  • Rugged design and inherently robust by using solid-state BJT technology integrated into a single die
  • ESD Protected up to 1kV on Human Body Model (HBM)
  • “Lead-Free”, RoHS Compliant
  • Halogen and Antimony Free "Green" Device
  • Qualified to AEC-Q101 Standards for High Reliability
  • Application(s)

  • Automotive: 5.0 V Driven Relays, Lamp Drivers, Motor Controls
  • Telecom equipment: Modems, DSL, Cable (EMTA), Line Cards, IP-PBX, Analog Terminal Adaptors, End User Telecom Equipment
  • Desktop Computers, Printers, Photocopiers
  • LCD & Plasma TVs, Set Top Boxes
  • Consumer Appliances, White Goods, Automated Door Control
  • Industrial equipment inc. Process Control, ATE equipment
  • Solar inverters
  • Product Specifications

    Product Parameters

    AEC Qualified Yes
    Compliance (Only Automotive supports PPAP) Standard
    R1 / R2 (KΩ) 1, 33 KΩ
    MaximumVCEO/VCC (V) 6 V
    MaximumIO/IC (mA) 500 mA

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    Technical Documents

    Recommended Soldering Techniques


    RoHS CofC

    Product Change Notices (PCNs)

    A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

    PCN # Issue Date Implementation Date Subject
    PCN-2495 2021-03-31 2021-07-01 Qualification of Additional Assembly & Test Sites and Additional Wafer Back Grinding and Back Metal Process
    Source for Select Discrete Products