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CST Series – High Frequency
SMT Current Sensing Transformers

New RoHS part numbers are shown. Lead was removed from terminations. The second to the last character is now L to indicate RoHS compliance. (View old data sheet.)

  • Senses current to greater than 10 Amps
  • For use between 50 kHz to 1 MHz
  • 500 V isolation winding to winding
  • 8 different turns ratios to meet variety of requirements
  • 2 pin-out configurations for different applications
  • 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


CST1-020L_ 1 : 20 81 0.0007 (8-7) 0.400 (6-4) 10 2.0 16 Red
CST1-030L_ 1 : 30 180 0.0007 (8-7) 0.870 (6-4) 10 3.0 24 Orange
CST1-040L_ 1 : 40 320 0.0007 (8-7) 1.140 (6-4) 10 4.0 32 Yellow
CST1-050L_ 1 : 50 500 0.0007 (8-7) 1.500 (6-4) 10 5.0 41 Green
CST1-060L_ 1 : 60 730 0.0007 (8-7) 1.980 (6-4) 10 6.0 49 Blue
CST1-070L_ 1 : 70 980 0.0007 (8-7) 4.750 (6-4) 10 7.0 57 Violet
CST1-100L_ 1 : 100 2000 0.0007 (8-7) 5.500 (6-4) 10 10.0 81 Gray
CST1-125L_ 1 : 125 3000 0.0007 (8-7) 6.500 (6-4) 10 12.5 101 Black

CST2-020L_ 1 : 20 81 0.0007 (8-7) 0.400 (1-3) 10 2.0 16 Red
CST2-030L_ 1 : 30 180 0.0007 (8-7) 0.870 (1-3) 10 3.0 24 Orange
CST2-040L_ 1 : 40 320 0.0007 (8-7) 1.140 (1-3) 10 4.0 32 Yellow
CST2-050L_ 1 : 50 500 0.0007 (8-7) 1.500 (1-3) 10 5.0 41 Green
CST2-060L_ 1 : 60 730 0.0007 (8-7) 1.980 (1-3) 10 6.0 49 Blue
CST2-070L_ 1 : 70 980 0.0007 (8-7) 4.750 (1-3) 10 7.0 57 Violet
CST2-100L_ 1 : 100 2000 0.0007 (8-7) 5.500 (1-3) 10 10.0 81 Gray
CST2-125L_ 1 : 125 3000 0.0007 (8-7) 6.500 (1-3) 10 12.5 101 Black
1 When ordering, please specify packaging code: e.g. CST1-125LC or CST2-125LC
  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 Primary current of 10 A causes approximately 25°C temperature rise above 25°C ambient. Higher current causes a greater temperature rise (see Temperature Rise vs Current curve).
4 Terminating resistor value is based on 1 Volt output with 10 Amps flowing through the primary. Varying terminating resistance increases or decreases output Voltage/Ampere according to the following equation:
RT (Ohms) = Vout × Nsec / Iin.
5 Maximum volt-time product for the secondary.
6 Ambient temperature range: –40°C to +125°C
7 Storage temperature range: Component: –40°C to +125°C
T&R packaging: –40°C to +80°C
8 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.
9 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.

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Updated: April 21, 2010