CST1211 Series SMT Current Sense Transformers | Coilcraft
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CST1211 Series
SMT Current Sense Transformers

  • Sensed current up to 28 Amps
  • For use between 1.18 kHz to 1 MHz
  • Very low primary resistance
  • AEC-Q200 Grade 1 (−40°C to +125°C)
  • 3000 Vrms, one minute isolation (hipot) winding to winding
  • 3.6 mm creepage and clearance
  • UL Class 180 (H) insulating materials
  • RoHS-compliant. 260°C compatible. Tin-silver-copper over tin over nickel over copper terminations

SPECIFICATIONS


Part number1
Click to get parts
Turns (N)
pri : sec
Inductance2
min (mH)
DCR max
(Ohms)
Freq
range
(kHz)
Volt‑time
product3
(Vµsec)
Sensed
current4
Iin (A)
Terminating
resistance RT5
(Ohms)
Pri Sec
CST1211-050LD 1 : 50 1.7 0.00153 0.65 33 – 1000 106.0 28 1.8
CST1211-070LD 1 : 70 3.0 0.00153 1.38 24 – 1000 148.4 28 2.5
CST1211-100LD 1 : 100 7.0 0.00153 2.79 17 – 1000 212.0 28 3.6
CST1211-125LD 1 : 125 11.0 0.00153 4.85 13 – 1000 265.0 28 4.5
CST1211-200LD 1 : 200 32.0 0.00153 10.42 11 – 1000 424.0 28 7.1
1 Packaging D = 13" machine-ready reel
EIA-481 embossed plastic tape (350 parts per full reel).
2 Inductance measured between secondary pins at 100 kHz, 0.1 Vrms, 0 Adc.
3 Maximum volt-time product is for the secondary, based on 2000 Gauss.
4 Primary current of 28 A causes less than 40°C temperature rise from 25°C ambient. Higher current causes a greater temperature rise (see Temperature Rise vs Current curve).
5 Terminating resistance (RT) value is based on 1 Volt output with 28 Amps flowing through the primary. Varying terminating resistance increases or decreases output Voltage/Ampere according to the following equation:
RT (Ohms) = Vout × Nsec / Iin.
6 Ambient temperature range: −40°C to +125°C
7 Maximum part temperature: +165°C (ambient + temp rise)
8 Storage temperature range: Component: −40°C to +165°C
Tape and reel packaging: −40°C to +80°C
9 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.
10 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: June 10, 2019