Document 385-1
SMT Current Sensors
–
CST Series
•ꢀ Forꢀuseꢀfromꢀ50ꢀkHzꢀtoꢀnearlyꢀ1ꢀMHz
•ꢀ Twoꢀdifferentꢀpinoutsꢀtoꢀmeetꢀtheꢀrequirementsꢀofꢀdifferentꢀ
applications.
•ꢀ LowꢀprimaryꢀDCꢀresistance;ꢀ500ꢀVꢀisolationꢀbetweenꢀwindings.
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
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 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 Only pure water or alcohol recommended
Sensed Terminating Volt-time
Part number1
DCR max (Ohms)
Primary
4
Turns (N) Inductance2
current3 resistance RT product5
Color
dot
CST1
CST2
pri:sec
min (µH)
Secondary Iin (A)
(Ohms)
(V-µsec)
CST1-020L_
CST1-030L_
CST1-040L_
CST1-050L_
CST1-060L_
CST2-020L_
CST2-030L_
CST2-040L_
CST2-050L_
CST2-060L_
1:20
1:30
1:40
1:50
1:60
81
180
320
500
730
0.0007
0.0007
0.0007
0.0007
0.0007
0.400
0.870
1.14
10
10
10
10
10
2.0
3.0
4.0
5.0
6.0
16
24
32
41
49
Red
Orange
Yellow
Green
Blue
1.50
1.98
CST1-070L_
CST1-100L_
CST1-125L_
CST2-070L_
CST2-100L_
CST2-125L_
1:70
1:100
1:125
980
2000
3000
0.0007
0.0007
0.0007
4.75
5.50
6.50
10
10
10
7.0
10.0
12.5
57
81
101
Violet
Gray
Black
1. When ordering, please specify termination and packaging codes:
Typical Circuits
CSTX-125LC
Termination: L = RoHS compliant tin-silver over tin over nickel over phos
bronze (pins 1 – 6); RoHS compliant tin-silver over tin
over nickel over copper (pins 7 – 8)
CST1
8
6
Special order: S = non-RoHS tin-lead (63/37) over tin
over nickel over phos bronze (pins 1 – 6); nonRoHS tin-
lead over gold over nickel over copper (pins 7 – 8).
Pri
(1 turn)
Sec
(N turns)
I
R
T
Vout
in
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.
7
4
D =13″ machine-ready reel. EIA-481 embossed plastic
CST2
tape (1000 parts per full reel).
8
1
2. Inductance measured between secondary pins at 100 kHz, 0.1 Vrms.
3. Primary current of 10 A causes approximately 25°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
10 Amps flowing through the primary. Varying terminating resistance
increases or decreases output Voltage/Ampere according to the fol-
lowing equation: RT (Ohms) = Vout × Nsec/Iin.
Pri
(1 turn)
Sec
(N turns)
I
R
T
Vout
in
7
3
5. Maximum volt-time product for the secondary.
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Specifications subject to change without notice.
Document 385-1 Revised 08/17/11
US +1-847-639-6400 sales@coilcraft.com
Please check our website for latest information.
UK +44-1236-730595 sales@coilcraft-europe.com
© Coilcraft Inc. 2012
This product may not be used in medical of high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check out web site for latest information.
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
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