• 1.

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

  • 2.

    Secondary Inductance: Tested at 10kHz, 0.1VRMS.

  • 3.

    Primary DCR (1-2): 0.2 mΩ (Ref)

  • 4.

    Current Rating: Peak current (50% duty cycle) through primary (1-2) to cause 40°C temperature rise at 25°C ambient.

  • 5.

    SRF: Values are for reference only.

  • 6.

    Terminating Resistor (RB): To calculate the value use the formula,
    RB = EOTR/IP

  • 7.

    Flammability Standard: Meets UL 94V-0.

  • 8.

    ET Product: The maximum ET is based upon a flux density of 3700 Gauss at 25°C. Suitable for bipolar applications only.

    ET = EO/2f
    EO = IPRB/TR

    Where as,

    EO = Output voltage (V)   TR = Turns Ratio
    RB = Term. Resistor (Ω)       f = Frequency (Hz)
    IP = Primary Current (A)

  • 9.

    PACKAGING

    • Pieces/Tray: 121

    • Trays/Box: 10

    • Pieces/Box: 1210

  • 10.

    Specifications subject to change without prior notice.

Frequently Asked Questions (FAQs)

What determines CT10’s 40 A current rating?

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The 40 Arms rating corresponds to a temperature rise of 40 °C at 25 °C ambient. System designers must ensure their primary conductor is sized appropriately to carry the current without exceeding thermal limits.

How do turns-ratio options affect CT10’s output?

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Higher turns ratios increase secondary voltage for a given primary current, which may improve sensing resolution but require careful burden resistor selection. Lower ratios produce smaller voltage with lower dissipation.

Can CT10 be used at typical SMPS switching frequencies?

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Yes, when switching frequency, burden resistor, and waveform characteristics remain within CT10’s ET-product and SRF boundaries. Operation too close to SRF or ET limits may introduce distortion.

How should CT10 be placed relative to switching components?

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To reduce noise coupling, position CT10 away from high-dv/dt nodes and minimize loop areas in the secondary path. Place the burden resistor close to the secondary pins for best accuracy.

How do I avoid saturating CT10’s core?

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Ensure the volt-seconds applied to the transformer remain below the ET-product limit. Long on-times at high current or oversized burden resistors can cause flux imbalance and saturation.

Is CT10 suitable for pulsed or non-sinusoidal waveforms?

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Yes, as long as the waveform includes adequate reset per switching cycle and remains within ET limits. SMPS triangular and pulsed currents are typical use cases.

Can CT10 sense bidirectional currents?

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Yes. CT10 supports AC and bidirectional switching-current waveforms provided reset conditions are met.

What isolation level does CT10 provide?

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CT10 is Hi-Pot tested to 3000 VAC, enabling safe measurement of elevated-voltage or isolated power rails.

What factors most influence measurement accuracy?

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ET limitations, burden resistor selection, PCB parasitics, proximity to switching nodes, and the current waveform shape can affect amplitude accuracy and phase characteristics.

Where can I get datasheet, models, and mechanical files for CT10?

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All documentation, including datasheets and mechanical drawings, is available on the CT10 product page at ICE Components.