• 1.

    Operating Temperature Range: The combination of ambient temperature and temperature rise.

  • 2.

    Storage Temperature Range: -20°C to +60°C. Applies to parts removed from original packaging.

  • 3.

    Drive Inductance: Tested at 10kHz, 0.1 VRMS.

  • 4.

    SRF: Values are for reference only.

  • 5.

    Flammability Standard: Meets UL 94V-0.

  • 6.

    ET Product: The maximum ET is based upon a flux density of 2200 Gauss at 25°C.

    ET = EP/2f
    Where as, EP = Primary Voltage (V) f = Frequency (Hz)

  • 7.

    Hi-Pot Rating: GT04: Drive-Gate = 4,500 VDC, Gate1-Gate2 = 1500VDC; GT04-U: Drive-Gate = 4,500VAC, Gate1-Gate2 = 2500VAC. Tested @ 60Hz, 1mA.

  • 8.

    Suitable for bipolar applications only.

  • 9.

    PACKAGING

    • Pieces/Tray: 120

    • Trays/Box: 12

    • Pieces/Box: 1440

  • 10.

    Compliance & Solutions:

    REACH Compliant    RoHS Compliant    Custom Solutions

  • 11.

    Specifications subject to change without prior notice.

Frequently Asked Questions (FAQs)

What effect does the GT04’s turns ratio have on gate voltage delivered to the power device?

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GT04 parts are offered with either 1:1:1 or 1:2.5:2.5 primary:secondary:tertiary turns ratios. A higher secondary ratio (1:2.5) increases the voltage seen at the gate relative to the driver’s primary voltage, allowing designers to tailor gate drive amplitude to the MOSFET/IGBT requirements without changing the driver IC.

How does drive inductance influence gate-drive waveform shape?

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Drive inductance values in the GT04 range from approximately 0.039 mH to 8.91 mH depending on variant. Higher inductance tends to slow down current changes, flattening and broadening pulses, while lower inductance supports sharper transitions but can increase driver current demand. Selecting the appropriate inductance ensures proper balance between pulse fidelity and driver loading.

What role does leakage inductance play in the GT04’s performance?

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Leakage inductance (listed up to ~1500 nH on larger variants) limits how tightly the magnetic flux is coupled between windings. Lower leakage helps maintain clean gate transitions and reduces overshoot or ringing. Higher leakage may be acceptable in slower switching systems but can cause waveform distortion in high-speed designs.

How should ET product (V-µs) be considered in driver design?

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The GT04’s ET product — ranging from ~63 V-µs to ~378 V-µs across variants — represents the Volt-microsecond area the core can support before saturation. Designers should ensure the gate-drive pulse voltage and duration do not exceed this rating, especially at low switching frequencies, to prevent core saturation and waveform distortion.

Why is SRF (self-resonant frequency) relevant even if it’s not a primary spec?

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SRF values (typically 0.3–4.3 MHz) indicate where winding parasitic inductance and capacitance resonate. Operating too close to SRF can lead to unintended peaking or attenuation of gate pulses. Staying well below SRF helps maintain predictable transformer behavior in the specified 20 kHz–300 kHz range.

How does the isolated 4500 VDC rating affect safety and layout?

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The GT04 Series provides robust isolation between the drive and gate windings with a 4.5 kVDC dielectric rating, enabling safe operation in high-voltage AC/DC converters and offline supplies. Designers should maintain appropriate creepage and clearance distances on the PCB to preserve this isolation in finished assemblies.

What practical impact does winding DCR have on driver loading?

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DCR values (e.g., 40 mΩ–2700 mΩ depending on winding and variant) directly affect how much current the transformer draws from the driver. Lower DCR reduces resistive loss and reduces driver stress but may increase magnetizing current. Selecting a variant with proper DCR helps avoid excessive power loss and driver heating.

How should I choose between the 1:1:1 and 1:2.5:2.5 variants?

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Use the 1:1:1 variants for gate-drive circuits where the gate threshold and voltage swing are close to the driver’s native voltage. Choose 1:2.5:2.5 variants when higher gate-drive voltages are needed without changing driver supply voltages, such as when driving higher-gate-charge devices or optimizing switching performance.

Do GT04 transformers require specific driver impedance matching?

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Driver impedance affects how quickly energy is transferred into the transformer’s magnetizing inductance. Drivers with low output impedance allow sharper edges and less distortion in the gating waveform. Ensuring the driver can source and sink sufficient current for the transformer’s inductance and DCR helps achieve clean switching performance.

What should be checked when validating GT04 performance in simulation?

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Engineers should include the transformer’s actual drive inductance, leakage inductance, DCR, ET product, and turns ratio in simulation models rather than treating the transformer as ideal. This yields more realistic predictions of gate voltage amplitude, rise/fall times, and current draw on the driver during switching events.