Specifications subject to change without notice.
Please check our website for latest information.
US
UK
Taiwan
China
Singapore
+1-847-639-6400 sales@coilcraft.com
+44-1236-730595 sales@coilcraft-europe.com
+886-2-2264 3646 sales@coilcraft.com.tw
+86-21-6218 8074 sales@coilcraft.com.cn
+ 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2012
This product may not be used in medical of high
risk applications without prior Coilcraft appr
oval.
Specification subject to change without notice.
Please check out web site for latest infor
mation.
SMT Current Sensors
–
CST Series
Document 385-1
Document 385-1 Revised 08/17/11
Sensed Terminating Volt-time
Part number1 Turns (N) Inductance2 DCR max (Ohms) current3
resistance RT4 product5 Color
CST1 CST2 pri : sec min (µH) Primary Secondary Iin (A) (Ohms) (V-µsec) dot
CST1-020L_ CST2-020L_ 1 : 20 81 0.0007 0.400 10 2.0 16 Red
CST1-030L_ CST2-030L_ 1 : 30 180 0.0007 0.870 10 3.0 24 Orange
CST1-040L_ CST2-040L_ 1 : 40 320 0.0007 1.14 10 4.0 32 Yellow
CST1-050L_ CST2-050L_ 1 : 50 500 0.0007 1.50 10 5.0 41 Green
CST1-060L_ CST2-060L_ 1 : 60 730 0.0007 1.98 10 6.0 49 Blue
CST1-070L_ CST2-070L_ 1 : 70 980 0.0007 4.75 10 7.0 57 Violet
CST1-100L_ CST2-100L_ 1 : 100 2000 0.0007 5.50 10 10.0 81 Gray
CST1-125L_ CST2-125L_ 1 : 125 3000 0.0007 6.50 10 12.5 101 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 tin-silver over 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); nonRoHS 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. 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.
5. Maximum volt-time product for the secondary.
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
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
• Forusefrom50kHztonearly1MHz
• Twodifferentpinoutstomeettherequirementsofdifferent
applications.
• LowprimaryDCresistance;500Visolationbetweenwindings.
Typical Circuits
CST1
CST2
8
Sec
(N turns)
Pri
(1 turn)
7
6
4
RTVout
Iin
1
3
8
Sec
(N turns)
Pri
(1 turn)
7
RTVout
Iin
US
UK
Taiwan
China
Singapore
+1-847-639-6400 sales@coilcraft.com
+44-1236-730595 sales@coilcraft-europe.com
+886-2-2264 3646 sales@coilcraft.com.tw
+86-21-6218 8074 sales@coilcraft.com.cn
+ 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2012
This product may not be used in medical of high
risk applications without prior Coilcraft appr
oval.
Specification subject to change without notice.
Please check out web site for latest infor
mation.
CST Series Current Sensors
Dimensions
Document 385-2
Document 385-2 Revised 08/17/11
Temperature Rise vs Current Pinouts
0.079 ±0.008
2,0 ±0,2
0.073 ±0.008
1,85 ±0,2
0.023 ±0.008
0,6 ±0,2
0.320
8,13
Color dot by
pin 1indicates
partnumber
max
0.004 / 0,10
0.047
1,2
0.118
3,0
0.051
1,3
0.051
1,3
0.063
1,6
0.098
2,5
0.106
2,7 0.073
1,85
Recommended Land Pattern
0.315
8,0
0.235
5,97 max max
0.245
6,22
0.209
5,3
max
max
80
70
60
50
40
30
20
0
10
Temperature rise (from 25°C)
Current (A rms)
420861210 16 1814 20
8
7
34
16
7
8
34
16
CST1
Bottom View Bottom View
CST2