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
Part number
1
CST7030-020L_
CST7030-050L_
CST7030-070L_
CST7030-100L_
CST7030-150L_
Turns (N)
pri : sec
1
:
20
1
:
50
1
:
70
1
:
100
1
:
150
Inductance
2
min (mH)
0.053
0.333
0.652
1.330
2.993
DCR max
(Ohms)
pri
sec
0.0015
0.420
0.0015
2.76
0.0015
5.04
0.0015
10.68
0.0015
22.30
Frequency
range
(kHz)
78 – 1000
31 – 1000
22 – 1000
16 – 1000
10 – 1000
Volt-time
product
3
(Vµsec)
6.4
16.0
22.4
32.0
48.0
Sensed
current
I
in
4
max (A)
20
20
20
20
20
Terminating
resistance R
T
5
(Ohms)
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 (R
T
) 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:
R
T
= V
out
× N
sec
/
I
in.
6 Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Typical Circuit
4
1
–
I
in
Pri
(1 turn)
Sec
I
(N turns)
out
R
T
V
out
3
2
+
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; 2500/13″ 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 additional
aqueous wash. See
Doc787_PCB_Washing.pdf.
Document 1101-1
Revised 06/24/15
© Coilcraft Inc. 2017
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
Specifications subject to change
US
+1-847-639-6400 sales@coilcraft.com
without notice.
Please check our website 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 1101-2
CST7030 SMT Current Sense Transformers
Temperature Rise vs Current
45
40
Temperature rise (from 25°C)
35
30
25
20
15
10
5
0
0
5
10
15
20
25
30
Current (A rms)
Dimensions
0.118
max
3,0
0.118
3,0
0.205
5,2 max
0.006 /0,15
0.276
max
7,0
0.010
0,25
0.043
1,1
0.102
2,60
4
1
2
3
0.047
1,2
0.043
1,1
0.047
1,2
0.043
1,1
0.030
0,75
1
Recommended
Land Pattern
0.067
1,70
0.063
1,6 0.063
1,6
4
0.073
1,85
C
L
0.073
1,85
2
0.063
0.063 1,6
1,6
0.191
4,85
0.045
1,15
0.045
1,15
3
0.191
4,85
Dimensions are in
inches
mm
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 06/24/15
© Coilcraft Inc. 2017
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
