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Base/Gate Driver Transformers

  • Frequency range of 10 - 250 kHz and up
  • 3750 Vrms, one minute isolation (hipot) between primary and secondary windings;
    1500 Vrms, one minute between secondaries
  • UL1446 Class B (130°C) Insulation System (UL File E83628)
  • RoHS-compliant. Tin-silver over tin over copper terminations.
  • Samples of 4 standard transformers available in Coilcraft Designer's Kit P404

Photo    Pricing    PDF data sheet


Standard Version Specifications


Part number
Click to get parts
SD250-1L SD250-2L SD250-3L SD250-4L
Turns ratio ±3% (pri : sec) 1 : 1 1 : 1.5 1 : 1 : 1 1 : 1.5 : 1.5
Primary winding
Inductance (min)1 1.5 mH 1.5 mH 1.5 mH 1.5 mH
Leakage inductance (max)1 4.0 µH 4.0 µH 4.0 µH 4.0 µH
DCR2 0.4 Ohms 0.4 Ohms 0.4 Ohms 0.4 Ohms
Volt-time product 375 V-µsec 375 V-µsec 375 V-µsec 375 V-µsec
Secondary winding(s)
Capacitance, pri to sec (max) 50 pF 50 pF 50 pF 50 pF
DCR, each section (max)2 0.75 Ohms 2.5 Ohms 0.75 Ohms 2.5 Ohms
1 Measured at 1 Vrms, 15.75 kHz
2 DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
3 Ambient temperature range: −40°C to +85°C
4 Storage temperature range: Component: −40°C to +85°C
Packaging trays: −40°C to +80°C
5 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.

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Updated: October 30, 2017