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.
Turns DCR max Frequency Volt-time Sensed Terminating
Part number1
Inductance2 (Ohms) range
product3 current I 4 resistance R 5 Color
(N)
in
T
CST1
CST2
pri
:
sec min (µH) Pri
Sec
(kHz)
(V-µsec) max (A)
(Ohms)
dot
CST1-020L_ CST2-020L_ 1 : 20
81
0.0007 0.400 46 – 1000
10.8
20
1.0
Red
CST1-030L_ CST2-030L_ 1 : 30
180
0.0007 0.870 31 – 1000
16.2
20
1.5
Orange
CST1-040L_ CST2-040L_ 1 : 40
320
0.0007 1.14
23 – 1000
21.6
20
2.0
Yellow
CST1-050L_ CST2-050L_ 1 : 50
500
0.0007 1.50
19 – 1000
27.0
20
2.5
Green
CST1-060L_ CST2-060L_ 1 : 60
730
0.0007 1.98
15 – 1000
32.4
20
3.0
Blue
CST1-070L_ CST2-070L_ 1 : 70
980
0.0007 4.75
13 – 1000
37.8
20
3.5
Violet
CST1-100L_ CST2-100L_ 1 : 100
2000
0.0007 5.50 9 – 1000
54.0
20
5.0
Gray
CST1-125L_ CST2-125L_ 1 : 125
3000
0.0007 6.50 7 – 1000
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 machine-ready reel. EIA-481 embossed plastic
= 7″
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 (RT) 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: RT (Ohms) = Vout × Nsec / Iin.
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Typical Circuits
CST1
8
Pri
(1 turn)
Sec
(N turns)
7
4
8
I in
6
1
Pri
(1 turn)
Sec
(N turns)
7
3
RT
Vout
RT
Vout
CST2
I in
Specifications subject to change
US +1-847-639-6400 sales@coilcraft.comwithout 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 10/11/16
© Coilcraft Inc. 2016
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.
