Document 915-1
Current Sensing Transformers
CST4835
•
•
•
•
AEC-200 Grade 3 qualified (–40°C to +85°C ambient)
Miniature SMT design, only 4.5 × 4.8 mm footprint
500 Vac, one minute isolation between windings
Designed for use from 50 kHz up to 1 MHz to sense continuous
currents to 7 Amps
Core material
Ferrite
Environmental
RoHS compliant, halogen free
Terminations
RoHS compliant silver over nickel over phos bronze.
Other terminations available at additional cost.
Weight
115 – 122 mg
Ambient temperature
–40°C to +85°C
Storage temperature
Component: –40°C to +85°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
500/7″ reel; 2200/13″ reel; Plastic tape: 12 mm wide,
0.35 mm thick, 8 mm pocket spacing, 3.6 mm pocket depth
PCB washing
Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf
Part
number
1
CST4835-020E_
CST4835-030E_
CST4835-040E_
CST4835-050E_
CST4835-060E_
CST4835-070E_
CST4835-100E_
CST4835-125E_
CST4835-150E_
Turns
pri : sec (N)
1
:
20
1
:
30
1
:
40
1
:
50
1
:
60
1
:
70
1
:
100
1
:
125
1
:
150
Inductance
2
min (µH)
33
74
132
205
295
400
820
1280
1800
Primary DCR (Ohms)
typ
max
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
Secondary
DCR max
(Ohms)
0.35
0.90
1.60
2.50
3.60
4.60
9.50
13.0
21.0
Sensed
current
3
I
in
(A)
7
7
7
7
7
7
7
7
7
1. When ordering, please specify
termination
and
packaging
codes:
CST4835-150EC
Termination: E
= RoHS compliant silver over nickel over phos bronze
Special order:
T
= RoHS tin-silver-copper (95.5/4/0.5) or
S
= non-RoHS tin-lead (63/37).
Packaging: C
= 7″ machine-ready reel. EIA-481 embossed plastic
tape (500 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 (2200 parts per full reel).
2. Inductance measured between secondary pins at 100 kHz, 0.1 Vrms,
0 Adc.
3. Primary current of 7 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. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
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 915-1
Revised 08/07/13
© Coilcraft Inc. 2013
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 915-2
CST4835 Series SMT Current Sensing Transformers
Temperature Rise vs Current
50
0.177
max
4,5
0.138
max
3,5
1
2
2
3
Temperature rise (from 25°C)
45
40
35
30
25
20
15
10
5
0
0
1
2
3
4
5
6
7
8
9
10
11 12
4
Primary
1 turn
3
0.189
max
4,8
0.098
2,5
0.033
0,85
2
Secondary
N turns
1
0.49
1,25
1
4
0.01
0,25
0.140
3,55
2
3
Current (A rms)
0.104
2,65
Dimensions are in
inches
mm
Recommended
Land Pattern
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 915-2
Revised 08/07/13
© Coilcraft Inc. 2013
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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