CST1-020L Datasheet, PDF (1/2 Pages) Coilcraft lnc. – SMT Current Sensors

Document 385-1
SMT Current Sensors – CST Series
The CST surface mount current sensing transformers
are designed for use from 50 kHz to nearly 1 MHz to
sense continuous currents to 10 Amps and greater.
The CST1 and CST2 differ in pinout numbering and layout
in order to meet the requirements of different applications.
These transformers feature extremely low primary DC
resistance and 500 V isolation between windings. They
are available in eight different turns ratios to meet a
wide variety of requirements. They are ideal for use in
switching power supply applications.
Coilcraft Designer’s Kit C389 contains samples of each
of the standard parts shown. To order, contact Coilcraft
or visit http://order.coilcraft.com.
Part number¹
CST1
CST2
CST1-020L_
CST1-030L_
CST1-040L_
CST1-050L_
CST1-060L_
CST2-020L_
CST2-030L_
CST2-040L_
CST2-050L_
CST2-060L_
CST1-070L_
CST1-100L_
CST1-125L_
CST2-070L_
CST2-100L_
CST2-125L_
Turns (N)
pri : sec
1 : 20
1 : 30
1 : 40
1 : 50
1 : 60
1 : 70
1 : 100
1 : 125
Inductance²
DCR max (Ohms)
Sensed Terminating Volt-time
current³ resistance R_T⁴ product⁵
min (µH) Primary Secondary I_in (A) (Ohms) (V-µsec)
81
0.0007
0.400
10
2.0
16
180
0.0007
0.870
10
3.0
24
320
0.0007
1.14
10
4.0
32
500
0.0007
1.50
10
5.0
41
730
0.0007
1.98
10
6.0
49
980
0.0007
4.75
10
7.0
57
2000
0.0007
5.50
10
10.0
81
3000
0.0007
6.50
10
12.5
101
Color
dot
Red
Orange
Yellow
Green
Blue
Violet
Gray
Black
1. When ordering, please specify termination and packaging codes:
Typical Circuits
CSTX-125LC
Termination: L = RoHS compliant matte tin over nickel over phos bronze
CST1
Special order:
T = RoHS tin-silver-copper (95.5/4/0.5) or
8
6
S = non-RoHS tin-lead (63/37).
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.
I_in
Pri
(1 turn)
Sec
(N turns)
R_T
V_out
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).
7
4
2. Inductance measured between secondary pins at 100 kHz, 0.1 Vrms.
CST2
3. Primary current of 10 A causes approximately 25°C temperature rise
above 25°C ambient. Higher current causes a greater temperature
8
1
rise (see Temperature Rise vs Current curve).
4. Terminating resistance (R_T) 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
I_in
Pri
(1 turn)
Sec
(N turns)
R_T
V_out
following equation: R_T (Ohms) = V_out × N_sec / I_in.
5. Maximum volt-time product for the secondary.
6. Storage and operating temperature range -40°C to +125°C.
7. Electrical specifications at 25°C.
7
3
Specifications subject to change without notice.
Please check our website for latest information.
Document 385-1 Revised 06/11/09
© Coilcraft, Inc. 2009