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CST7030 Series
SMT Current Sense Transformers

  • Sensed current up to 20 Amps
  • For use up to 1 MHz
  • Very low primary resistance
  • AEC-Q200 Grade 1 (−40°C to +125°C)
  • 500 Vrms, 1 minute isolation (hipot) winding to winding
  • Designed for:
    Continuous AC current monitoring in switched-mode power supply;
    Overload and short-circuit protection;
    Current measurement in traction motor and battery management systems in conventional and xEV (EV, HEV, FCEV) vehicles.
  • Can also be used in 48 V vehicle electrical systems.
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations

SPECIFICATIONS


Part number1
Click to get parts
Turns (N)
pri : sec
L  min2
(mH)
DCR max (Ohms)3 Frequency
range
(kHz)
Volt‑time
product4
(Vµsec)
Sensed
current Iin5
max (A)
Terminating
resistance RT6
(Ohms)
Pri Sec
CST7030-020L_ 1 : 20 0.053 0.0015 0.420 78 – 1000 6.4 20 1.0
CST7030-050L_ 1 : 50 0.333 0.0015 2.76 31 – 1000 16.0 20 2.5
CST7030-070L_ 1 : 70 0.652 0.0015 5.04 22 – 1000 22.4 20 3.5
CST7030-100L_ 1 : 100 1.330 0.0015 10.68 16 – 1000 32.0 20 5.0
CST7030-150L_ 1 : 150 2.993 0.0015 22.30 10 – 1000 48.0 20 7.5
1 When ordering, please specify packaging code: e.g.CST7030-150LC
  Packaging C = 7" machine-ready reel
EIA-481 embossed plastic tape (600 parts per full reel).
B = Less than full reel
In tape, but not machine-ready. To have a leader and trailer added ($25 charge), use code letter D instead.
D = 13" machine-ready reel
EIA-481 embossed plastic tape. Factory order only, not stocked (2500 parts per full reel).
2 Inductance measured between secondary pins at 100 kHz, 0.1 Vrms, 0 Adc.
3 DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Maximum volt-time product is for the secondary, based on 2000 Gauss.
5 Primary current of 20 A causes less than 25°C temperature rise from 25°C ambient. Higher current causes a greater temperature rise (see Temperature Rise vs Current curve).
6 Terminating resistance (RT) value is based on 1 Volt output with 20 Amps flowing through the primary. Varying terminating resistance increases or decreases output Voltage/Ampere according to the following equation:
RT (Ohms) = Vout × Nsec / Iin.
7 Ambient temperature range: −40°C to +125°C
8 Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
9 Maximum part temperature: +165°C (Ambient + temperature rise)
10 Resistance to soldering heat: Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
11 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info..

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Updated: April 11, 2017