TLP 350 IGBT/MOSFET Gate Drive Optocoupler – 8 Pin DIP

Description

The TLP350 Gate Drive Optocoupler, manufactured by Toshiba, is a high-performance optical isolator explicitly designed to directly drive the gates of high-power IGBTs (Insulated-Gate Bipolar Transistors) and power MOSFETs. It consists of a GaAlAs light-emitting diode (LED) optically coupled to an integrated high-gain, high-speed photodetector, providing both exceptional galvanic isolation and a powerful output stage.

Available at Tomson Electronics, the TLP350 is housed in a standard 8-pin Dual Inline Package (DIP). Unlike standard signal optocouplers, this IC features a robust push-pull output capable of sourcing and sinking up to 2.5A of peak current. This makes it an essential component for hardware engineers building heavy-duty motor controllers, solar inverters, and high-frequency induction heating systems where driving high-capacitance power switches rapidly and safely is critical.

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Specifications

• Manufacturer: Toshiba
• Model: TLP350
• Package Type: 8-Pin DIP (Through-hole)
• Peak Output Current (Io): ±2.5A (Maximum)
• Operating Supply Voltage (Vcc): 15V to 30V
• Isolation Voltage: 3750 Vrms (Minimum)
• Propagation Delay Time: 500 ns (Maximum)
• Input Forward Current (If): 20 mA (Maximum recommended)

Datasheet

Download TLP350 (Toshiba) Datasheet PDF

Applications

• Industrial Motor Drives: Acting as the safe, isolated interface between low-voltage logic controllers and high-voltage AC or Brushless DC (BLDC) motor inverters.
• Solar & Wind Inverters: Driving the high-side and low-side IGBTs in grid-tied or off-grid power conversion equipment.
• Induction Heating (IH): Providing the rapid, high-current gate charging required for fast-switching resonance circuits in induction cooktops and industrial heaters.
• Uninterruptible Power Supplies (UPS): Managing the heavy-duty power switching stages required for reliable battery backup systems.

Frequently Asked Questions (FAQ)

Q: What makes the TLP350 different from a standard PC817 optocoupler?
A: A standard optocoupler like the PC817 is designed for low-level signal isolation and can only handle tiny amounts of current (usually under 50mA). The TLP350 features a specialized push-pull output stage capable of handling high-current surges up to 2.5A, which is necessary to overcome the gate capacitance and quickly turn on/off large power MOSFETs and IGBTs.

Q: Can I control this driver directly from an Arduino or ESP32?
A: Yes, you can drive the input LED side of the TLP350 using a 3.3V or 5V logic signal from a microcontroller (make sure to use an appropriate current-limiting series resistor). However, the output side of the TLP350 requires its own separate power supply (typically 15V to 30V) to properly drive the gate of your power transistor.

Q: Does this IC have built-in desaturation (short circuit) protection?
A: No, the TLP350 is a pure gate driver optocoupler. If you require advanced features like integrated active miller clamping or desaturation detection for high-end IGBT protection, you would need a more complex driver IC, though the TLP350 remains a highly reliable choice for standard gate drive applications.

Package Includes

• 1 × TLP350 IGBT/MOSFET Gate Drive Optocoupler (Toshiba) – 8-Pin DIP