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CST1, CST2 – High Frequency
SMT Current Sense Transformers

  • Senses current up to 20 Amps
  • For use up to 1 MHz
  • 500 Vrms, one minute isolation (hipot) winding to winding
  • Eight different turns ratios to meet variety of requirements
  • Two pin-out configurations for different applications
  • AEC-Q200 Grade 1 (−40°C to +125°C)
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations
  • Two samples of each value are available in Coilcraft Designer's Kit C389

SPECIFICATIONS


Part number1
Click to get parts
Turns (N)
pri : sec
L
min2
(µH)
DCR max (Ohms)3 Freq
range
(kHz)
Volt‑time
product4
(Vµsec)
Sensed
current5
Iin (A)
Terminating
resistance6
RT (Ohms)
Color
dot
Pri Sec
CST1-020L_ 1 : 20 81 0.0007 (8-7) 0.400 (6-4) 46 – 1000 10.8 20 1.0 Red
CST1-030L_ 1 : 30 180 0.0007 (8-7) 0.870 (6-4) 31 – 1000 16.2 20 1.5 Orange
CST1-040L_ 1 : 40 320 0.0007 (8-7) 1.14 (6-4) 23 – 1000 21.6 20 2.0 Yellow
CST1-050L_ 1 : 50 500 0.0007 (8-7) 1.50 (6-4) 19 – 1000 27.0 20 2.5 Green
CST1-060L_ 1 : 60 730 0.0007 (8-7) 1.98 (6-4) 15 – 1000 32.4 20 3.0 Blue
CST1-070L_ 1 : 70 980 0.0007 (8-7) 4.75 (6-4) 13 – 1000 37.8 20 3.5 Violet
CST1-100L_ 1 : 100 2000 0.0007 (8-7) 5.50 (6-4) 9 – 1000 54.0 20 5.0 Gray
CST1-125L_ 1 : 125 3000 0.0007 (8-7) 6.50 (6-4) 7 – 1000 67.5 20 6.3 Black
CST2-020L_ 1 : 20 81 0.0007 (8-7) 0.400 (1-3) 46 – 1000 10.8 20 1.0 Red
CST2-030L_ 1 : 30 180 0.0007 (8-7) 0.870 (1-3) 31 – 1000 16.2 20 1.5 Orange
CST2-040L_ 1 : 40 320 0.0007 (8-7) 1.14 (1-3) 23 – 1000 21.6 20 2.0 Yellow
CST2-050L_ 1 : 50 500 0.0007 (8-7) 1.50 (1-3) 19 – 1000 27.0 20 2.5 Green
CST2-060L_ 1 : 60 730 0.0007 (8-7) 1.98 (1-3) 15 – 1000 32.4 20 3.0 Blue
CST2-070L_ 1 : 70 980 0.0007 (8-7) 4.75 (1-3) 13 – 1000 37.8 20 3.5 Violet
CST2-100L_ 1 : 100 2000 0.0007 (8-7) 5.50 (1-3) 9 – 1000 54.0 20 5.0 Gray
CST2-125L_ 1 : 125 3000 0.0007 (8-7) 6.50 (1-3) 7 – 1000 67.5 20 6.3 Black
1 When ordering, please specify termination and packaging codes: e.g. CST1-125LC or CST2-125LC
  Termination L = RoHS compliant tin-silver over tin over nickel over phos bronze (pins 1 – 6); RoHS compliant Matte tin over nickel over copper (pins 7 – 8).
Special order, added cost: S = non-RoHS tin-lead (63/37) over tin over nickel over phos bronze (pins 1 – 6); non-RoHS tin-lead over gold over nickel over copper (pins 7 – 8).
  Packaging C = 7" machine-ready reel
EIA-481 embossed plastic tape (250 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 C instead. D = 13" machine-ready reel
EIA-481 embossed plastic tape (1000 parts per full reel).
2 Inductance measured across secondary at 100 kHz, 0.1 Vrms.
3 DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Maximum volt-time product for the secondary, based on 2000 gauss.
5 Primary current of 20 A causes approximately 35°C temperature rise from 25°C ambient. Higher current causes a greater temperature rise. (see Temperature Rise vs Current curve).
6 Terminating resistor 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 Maximum part temperature: +165°C (ambient + temp rise)
9 Storage temperature range: Component: −40°C to +165°C
Tape and reel packaging: −40°C to +80°C
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