Document 385-1
Current Sense Transformers
CST1, CST2
•
•
•
•
•
For use up to 1 MHz
AEC-Q200 Grade 1 qualified (–40°C to +125°C ambient)
Two pinouts to meet the requirements of different applications.
Low primary DC resistance
500 Vrms, one minute isolation (hipot) between windings.
Designer’s Kit C389
contains 2 each of each part
Core material
Ferrite
Terminations
See Note 1.
Weight
0.4 g
Ambient temperature
–40°C to +125°C
Maximum part temperature
165°C (ambient + temp rise)
Storage temperature
Component: –40°C to +165°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
250/7″reel;1000/13″ reel; Plastic tape: 16 mm wide,
0.35 mm thick, 12 mm pocket spacing, 5.6 mm pocket depth
PCB washing
Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See
Doc787_PCB_Washing.pdf.
Part number
1
CST1
CST2
CST1-020L_ CST2-020L_
CST1-030L_ CST2-030L_
CST1-040L_ CST2-040L_
CST1-050L_ CST2-050L_
CST1-060L_ CST2-060L_
CST1-070L_ CST2-070L_
CST1-100L_ CST2-100L_
CST1-125L_ CST2-125L_
Turns
(N)
pri : sec
1
:
20
1
:
30
1
:
40
1
:
50
1
:
60
1
:
70
1
:
100
1
:
125
Inductance
2
min (µH)
81
180
320
500
730
980
2000
3000
DCR (Ohms)
Pri
Sec
ref
max
0.0007 0.400
0.0007 0.870
0.0007 1.14
0.0007 1.50
0.0007 1.98
0.0007 4.75
0.0007 5.50
0.0007 6.50
Frequency
range
(kHz)
46 – 1000
31 – 1000
23 – 1000
19 – 1000
15 – 1000
13 – 1000
9 – 1000
7 – 1000
Volt-time
Sensed
Terminating
product
3
current
I
in
4
resistance R
T
5
Color
(V-µsec)
max (A)
(Ohms)
dot
10.8
20
1.0
Red
16.2
20
1.5
Orange
21.6
20
2.0
Yellow
27.0
20
2.5
Green
32.4
20
3.0
Blue
37.8
20
3.5
Violet
54.0
20
5.0
Gray
67.5
20
6.3
Black
1. When ordering, please specify
termination
and
packaging
codes:
CSTX-125LC
Termination: L
= RoHS compliant tin-silver over tin over nickel over phos
bronze (pins 1 – 6); RoHS compliant matte tin over
nickel over copper (pins 7 – 8)
Special order:
S
= non-RoHS tin-lead (63/37) over tin
over nickel over phos bronze (pins 1 – 6); non-RoHS
tin-lead over gold over nickel over copper (pins 7 – 8).
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 between secondary pins at 100 kHz, 0.1 Vrms.
3. Maximum volt-time product for the secondary, based on 2000 gauss.
4. Primary current of 20 A causes approximately 35°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 fol-
lowing equation: R
T
(Ohms) = V
out
× N
sec
/
I
in.
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Typical Circuits
CST1
8
6
+
I
in
Pri
(1 turn)
Sec
I
(N turns)
out
R
T
V
out
7
4
–
CST2
8
1
+
I
in
Pri
(1 turn)
Sec
I
(N turns)
out
R
T
V
out
7
3
–
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 385-1
Revised 04/22/17
© 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.
Document 385-2
CST Series Current Sense Transformers
Temperature Rise vs Current
40
Pinouts
CST1
8
3
CST2
7
4
3
Temperature rise (from 25°C)
35
30
25
20
15
10
5
0
4
1
7
6
1
8
6
Bottom View
0
2
4
6
8
10
12
14
16
18
20
Bottom View
Current (A rms)
Dimensions
0.235 max
5,97
Color dot by
pin 1 indicates
part number
0.245 max
6,22
0.209
max
5,3
0.315
max
8,0
0.320
max
8,13
0.004 / 0,10
Recommended Land Pattern
0.118
3,0
0.023 ±0.008
0,6 ±0,2
0.098
2,5
0.073 ±0.008
1,85 ±0,2
0.106
2,7
0.047
1,2
0.063
1,6
0.051
1,3
0.051
1,3
0.073
1,85
0.079 ±0.008
2,0 ±0,2
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 385-2
Revised 04/22/17
© 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.
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