Document 1101-1

Current Sense Transformers CST7030
AEC• AEC-Q200 Grade 1 (–40°C to +125°C)• Small surface mount current sensors• Sensed current up to 20 A; Designed for frequency range up
to 1 MHz and above• 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

Q200 +125°C			DCR max(Ohms)
Turns (N)
Inductance2
Part number1
pri : secmin (mH)pri   sec
CST7030-020L_
1 : 200.053
0.00150.420
CST7030-050L_
1 : 500.333
0.0015
2.76
CST7030-070L_
1 : 700.652
0.0015
5.04
CST7030-100L_
1 : 100
1.330
0.0015
10.68
CST7030-150L_
1 : 1502.993
0.001522.30
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). Quantities less than full
reel available: in tape (not machine ready) or withleader and trailer ($25 charge).
B = Less than full reel. In an effort to simplify our partnumbering system, Coilcraft is eliminating the needfor multiple packaging codes. When ordering, simply
change the last letter of your part number from B to C.
D = 13″ machine-ready reel. EIA-481 embossed plastictape. Factory order only, not stocked (2500 parts perfull reel).
2. Inductance measured between secondary pins at 100 kHz, 0.1 Vrms,
0 Adc.
3. For specific questions regarding frequency range, please contact us atcst@coilcraft.com.
4. Volt-time product is for the secondary, between pin 1 and 2.
5. Primary current of 20 A causes less than 25°C temperature rise from
25°C ambient. Higher current causes a greater temperature rise (seeTemperature Rise vs Current curve).
6. Terminating resistance (RT) value is based on 1 Volt output with 20 Amps
flowing through the primary. Varying terminating resistance increases ordecreases output Voltage/Ampere according to the following equation:
RT = Vout × Nsec / Iin.
7. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.

Frequency
range3(kHz)78 – >1000
31 – >1000
22 – >1000
16 – >1000
10 – >1000

Volt-time
product4(Vµsec)
6.4
16.0
22.4
32.0
48.0

SensedTerminating
current Iin5   resistance RT6max (A)(Ohms)
20
1.020
2.5
20
3.5
20
5.0
20
7.5

Typical Circuit
4I inPri(1 turn)

1–SecI(N turns) out3RTVout+2Core material Ferrite
Terminations RoHS compliant tin-silver-copper over tin over nickel overcopper

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)
Packaging 600/7″ reel; 2500/13″ reel Plastic tape: 16 mm wide,0.35 mm thick, 8 mm pocket spacing, 3.0 mm pocket depth
PCB washing Tested to MIL-STD-202 Method 215 plus an additionalaqueous wash. See Doc787_PCB_Washing.pdf.

Specificationssales@coilcraft.com
subject to change without notice.
US +1-847-639-6400
Please check ourwebsite for latest information.
UK +44-1236-730595
sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg

Document 1101-1

Revised 08/13/21© Coilcraft Inc. 2022
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 1101-2

CST7030 SMT Current Sense Transformers
Temperature Rise vs Current
45

Temperature rise (from 25°C)

AEC

Q200 +125°C

4035
30
2520
15
10
500

51015

202530Current (A rms)

Dimensions
0.118
max
3,00.118
3,00.006 /0,150.276
max
7,00.205
5,2 max

0.010
0,250.043
1,1

Recommended
Land Pattern

0.030
0,750.047
1,21230.102
2,604
10.043
1,10.047
1,20.043
1,10.073
1,85
CL0.063
1,6 0.063

4

1,60.073
1,8520.191
4,85

Dimensions are in0.067
1,700.063
0.063 1,6
1,60.045
1,150.045
1,15
30.191
4,85

inchesmm

US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg

Document 1101-2

Revised 08/13/21© Coilcraft Inc. 2022
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.