Document 131
Document 131 Revised 06/09/15
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.
Frequency Volt-time Sensed Terminating
Part Inductance1 DCR max range product2 current Iin resistance RT3 Color
number Turns (N) min (mH) (Ohms) (kHz) (Vµsec) max (A) (Ohms) code
D1869L 50 5 0.7 3 – 1000 149 35 1.4 Green
D1870L 100 20 1.4 2 – 1000 298 35 2.9 Brown
D1871L 200 80 4.5 1 – 1000 596 35 5.7 Red
CS1050L 50 5 0.7 3 – 1000 149 35 1.4
CS1100L 100 20 1.4 2 – 1000 298 35 2.9
CS1200L 200 80 4.5 1 – 1000 596 35 5.7
CS1750L 750 1125 62.0 0.2 – 1000 2235 35 21.4
D18xx Series
Leads 3 and A are in phase per orientation shown above.
0.75
19,05
0.20
5,08
0.033 ±0.002
0,84 ±0,05
0.50 ±0.015
12,7 ±0,38
0.80
20,30
max
min
1
33
Date
code
Color
code
max
0.465
11,81
0.125
3,175
0.45
11,43
0.34
8,64
max
A
max
max
max
B
0.80
20,3
0.20
5,08
max
min
0.70
17,8max
0.50 ±0.015
12,7 ±0,38
1
33
AB
0.158/0.218
5,544,01/
0.036/0.030
0,91/0,76
0.375
9,53 max
CS1xxx Series
1+
AB
I
in
RT
3−
V
out
Terminations: Tin-silver over copper
Weight: 4.0 – 4.5 g
Typical Circuit
Terminations: Tin-silver over copper
Weight: 5.3 – 5.8 g
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.
