Document
Document 1101-1
Current Sense Transformers CST7030
• AEC-Q200 Grade 1 qualified (–40°C to +125°C ambient) • Small surface mount current sensors • Sensed current up to 20 A; Frequency range up to 1 MHz • Very low primary DC resistance • 500 Vrms, one minute isolation (hipot) between windings • 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
Turn s (N) Induc tance2 D(CORhmmsa)x
Part number1 pri : sec min (mH)
pri sec
CST7030-020L_ 1 : 20 CST7030-050L_ 1 : 50 CST7030-070L_ 1 : 70 CST7030-100L_ 1 : 100 CST7030-150L_ 1 : 150
0.053 0.333 0.652 1.330 2.993
0.0015 0.0015 0.0015 0.0015 0.0015
0.420 2.76 5.04 10.68 22.30
Freraqnugeen cy
Volt-time Sensed Terminating product3 current Iin4 resistance RT5
(kHz)
(Vµsec) max (A) (Ohms)
78 – 1000 31 – 1000 22 – 1000 16 – 1000 10 – 1000
6.4 16.0 22.4 32.0 48.0
20 20 20 20 20
1.0 2.5 3.5 5.0 7.5
1. When ordering, please specify packaging code:
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 C 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. Maximum volt-time product is for the secondary, based on 2000 Gauss. 4. 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). 5. 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 = Vout × Nsec / Iin. 6 Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Typical Circuit
42
Iin
Pri (1 turn)
Sec (N turns)
RT
Vout
31
Core material Ferrite Terminations RoHS compliant tin-silver over tin over nickel over phos bronze Weight 0.16 g Ambient temperature –40°C to +125°C Maximum part temperature +165°C (ambient + temp rise) Storage temperature Component: –40°C to +125°C. Tape and reel packaging: –40°C to +80°C Resistance to soldering heat Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C / 85% relative humidity) Failures in Time (FIT) / Mean Time Between Failures (MTBF) 38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332 Packaging 600/7″ reel; 2500.