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CST2020 Series

Current Sense Transformers

RoHS compliant AEC-Q flag
  • Sensed current up to 40 Amps
  • For use between 400 Hz to 1 MHz
  • Very low primary resistance
  • AEC-Q200 Grade 1 (−40°C to +125°C)
  • Meets Reinforced Insulation per UL 60950-1.
Buy Now:
Count Unit price
1 $3.25
100 $2.60
300 $1.95
500 $1.17
1000 $0.91
2500 $0.78
5000 $0.72

For high volume or non-stock items, request a quote.

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Specifications

Electrical specifications at 25°C.

Part number Inductance
min (mH) 1
DCR max (Ω) Turns Ratio Volt-time
product (V-µs) 2
Frequency (kHz) Current (A) 3 Terminating
resistance RT (Ω) 4
Isolation
Voltage (Vrms) 5
Pri Sec Pri : Sec
CST2020-070L 3.46 0.00084 0.83 1 : 70 277 1.8 40.0 1.8 4000
CST2020-100L 7.07 0.00084 1.2 1 : 100 395 1.3 40.0 2.5 4000
CST2020-200L 28.28 0.00084 4.0 1 : 200 791 0.6 40.0 5.0 4000
CST2020-300L 63.63 0.00084 7.8 1 : 300 1186 0.4 40.0 7.5 4000
Notes
  1. Inductance measured between secondary pins at 10 kHz, 0.1 Vrms, 0 Adc.
  2. Maximum volt-time product is for the secondary, based on 2000 Gauss.
  3. Primary current of 40 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).
  4. Terminating resistance (RT) value is based on 1 Volt output with 40 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. 4000 Vrms, one minute isolation (hipot) winding to winding

Termination:

  • RoHS-compliant. 260°C compatible. Tin-silver-copper over tin over copper over steel (pins 1 – 3).
  • Tin-silver-copper over tin over nickel over copper (pins 4 – 5) terminations.
Environmental
Environmental:
RoHS compliant
Ambient temperature range:
–40°C to +125°C
Storage temperature range:
Component: –40°C to +165°C.
Tray packaging: –40°C to +80°C
Maximum part temperature:
+165°C (ambient + temp rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332

Performance curves

Temperature vs Current

Schematics

cst2020schematic.gif

Physical characteristics

cst2020dimensions.gif

dims_inches_mm.gif

General specification

Core Material:
Ferrite
Weight:
7 – 8.5 g
Packaging:
100 per tray

Washing

Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More Info.

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