Document 1471-1
Current Sense Transformers CST1211
• Designed for use up to 1 MHz and above
• AEC-Q200 Grade 1 (–40°C to +125°C)
AEC
+
Q200 125°C
• Insulation distances in compliance with IEC 60664 (basic
insulation, working voltage Vrms = 800 V)
• UL Class 180 (H) insulating materials, UL 1446 Class F8
• Bobbin plastic UL 94-V0, CTI PLC3
• Pri/Sec: 9 mm creepage and 8 mm clearance9
Core material Ferrite
Environmental RoHS compliant
Terminations Tin-silver-copper over tin over nickel over copper
Weight 2.6 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)
Packaging 350/13″ reel; Plastic tape: 24 mm wide, 0.5 mm thick,
16 mm pocket spacing, 11.6 mm pocket depth
PCB washing Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
DCR max
Frequency
range3
Volt-time
Sensed
Terminating
7
(Ohms)
6
Turns (N)
pri:sec
L2
Isolation4 product5 current Iin resistanceRT
Part number1
min (mH)
pri
sec
(kHz)
(Vrms)
(Vµsec)
(A)
(Ohms)
CST1211-050LD
CST1211-070LD
CST1211-100LD
CST1211-125LD
CST1211-200LD
1:50
1:70
1:100
1:125
1:200
1.7
3.0
7.0
11.0
32.0
0.00153
0.00153
0.00153
0.00153
0.65
1.38
2.79
4.85
33 – >1000
24 – >1000
17 – >1000
13 – >1000
11 – >1000
3000
3000
3000
3000
3000
106.0
148.4
212.0
265.0
424.0
28
28
28
28
28
1.8
2.5
3.6
4.5
7.1
0.00153 10.42
1
4
–
1. Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic
tape (350 parts per full reel). Quantities less than full reel available: in
tape (not machine ready) or with leader and trailer ($25 charge).
2. Inductance measured between secondary pins at 100 kHz,
0.1 Vrms, 0 Adc.
Pri
(1 turn)
Sec
(N turns)
Iout
Iin
R
T
Vout
3. For specific questions regarding frequency range, please contact us at
cst@coilcraft.com.
4. 3000 Vrms, one minute isolation (hipot) between windings.
5. Volt-time product is for the secondary, between pin 4 and 5.
6. Primary current of 28 A causes less than 40°C temperature rise from
25°C ambient. Higher current causes a greater temperature rise (see
Temperature Rise vs Current curve).
2
5
+
7. Terminating resistance (RT) value is based on 1 Volt output with 28 Amps
flowing through the primary. Varying terminating resistance increases or
decreases output Voltage/Ampere according to the following equation:
RT = Vout × Nsec/Iin.
8
UL 1446 Class F (155°C) Insulation System (UL File E83628 CC-5D
marking).
9. Creepage distance: Pri/Sec: 9 mm; Pri/Core: 5 mm
Clearance distance: Pri/Sec: 8 mm; Pri/Core: 4 mm.
10.Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Document 1471-1 Revised 10/26/21
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© Coilcraft Inc. 2022
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.