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Document 131
Current Sensors – D18xx, CS1xxx
These sensors function as the secondaries of a current
transformer.The conductor carrying the current to be mea-
sured is the “one turn primary.”Voltage per Ampere can be
adjusted by varying the terminating resistor (see note 3).
Applications include sensing branch circuit overload,
switcher feedback, and detecting load drop or shutdown.
They come in a molded version (CS1xxx Series) or en-
capsulated model (D18xx Series).
Coilcraft Designer’s Kit P403 contains samples of
the CS1050, CS1100 and CS1200 sensors, current
transformer versions with equivalent ratings, plus two
50/60 Hz current sensors. To order, contact Coilcraft or
visit http://order.coilcraft.com.
Part  Inductance1 DCR max
number Turns (N) min (mH)
(Ohms)
D1869L
D1870L
D1871L
CS1050L
CS1100L
CS1200L
CS1750L
50
100
200
50
100
200
750
5
20
80
5
20
80
1125
0.7
1.4
4.5
0.7
1.4
4.5
62.0
Frequency Volt-time Sensed Terminating
range
(kHz)
 (pVrµosdeucc)t 2 cmurarexn(At I)i n
resistance
(Ohms)
RT3 Ccoodloer
3 – 1000
2 – 1000
1 – 1000
3 – 1000
2 – 1000
1 – 1000
0.2 – 1000
149
298
596
149
298
596
2235
35
35
35
35
35
35
35
1.4
2.9
5.7
1.4
2.9
5.7
21.4
Green
Brown
Red
1. Inductance is measured at 1 kHz, 0.05 Vrms.
2. Volt-time product is based on 2000 Gauss.
3. Terminating resistance (RT) value is based on 1 Volt output with 35 Amps flowing through the primary. Varying terminating resistance increases or
decreases output Voltage/Ampere according to the following equation: RT = Vout × Nsec / Iin
4. Ambient temperature range –40°C to +85°C.
5. Electrical specifications at 25°C.
D18xx Series
CS1xxx Series
Typical Circuit
01.14,6851max
Date
code
0.20
5,08
min
109.7,055 max
BA
Color
code
0.34
8,64
max
0.45
11,43
max
3
0.125
3,175
max
3
0.50 ±0.015
12,7 ±0,38
Terminations: Tin-silver over copper
Weight:
4.0 – 4.5 g
200.8,300max
B
0.033 ±0.002
0,84 ±0,05
1
09.,35735max
0.70
17,8
max
A
0.80
20,3
max
0.20
5,08
min
3
0.158/0.218
4,01/5,54
0.036/0.030
0,91/0,76
31
0.50 ±0.015
12,7 ±0,38
A
1+
Iin
3
B
RT Vout
Terminations: Tin-silver over copper
Weight:
5.3 – 5.8 g
Leads 3 and A are in phase per orientation shown above.
Document 131 Revised 06/09/15