Document 1471-1

Current Sense Transformers CST1211
AEC• Designed for use up to 1 MHz and above• AEC-Q200 Grade 1 (–40°C to +125°C)• Insulation distances in compliance with IEC 60664 (basicinsulation, 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

Q200 +125°C

Core material Ferrite
Environmental RoHS compliant
Terminations Tin-silver-copper over tin over nickel over copper
Weight 2.6 gAmbient 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 additionalaqueous wash. See Doc787_PCB_Washing.pdf.

DCR max			(Ohms)
Turns (N)L2Part number1
pri : secmin (mH)pri   sec
CST1211-050LD
1 : 501.70.00153
0.65
CST1211-070LD
1 : 703.00.00153
1.38
CST1211-100LD
1 : 100
7.00.00153
2.79
CST1211-125LD
1 : 125
11.00.00153
4.85
CST1211-200LD
1 : 200
32.00.00153 10.42
1. Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic
tape (350 parts per full reel). Quantities less than full reel available: intape (not machine ready) or with leader and trailer ($25 charge).
2. Inductance measured between secondary pins at 100 kHz,
0.1 Vrms, 0 Adc.
3. For specific questions regarding frequency range, please contact us atcst@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 from25°C ambient. Higher current causes a greater temperature rise (seeTemperature Rise vs Current curve).
7. Terminating resistance (RT) value is based on 1 Volt output with 28 Amps
flowing through the primary. Varying terminating resistance increases ordecreases 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-5Dmarking).
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.

Frequency		
range3Isolation4(kHz)(Vrms)
33 – >10003000
24 – >10003000
17 – >10003000
13 – >10003000
11 – >10003000
1I in

Pri
(1 turn)

2US +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

Volt-time
product5(Vµsec)
106.0
148.4
212.0
265.0
424.0

Sensedcurrent Iin6(A)
2828
28
2828

Terminating
resistance RT7(Ohms)
1.8
2.5
3.64.57.1

4SecI(N turns) out

5Document 1471-1–RTVout+Revised 10/26/21© Coilcraft Inc. 2022
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 1471-2

CST1211 Series SMT Current Sense Transformers
Temperature Rise vs Current
4540

Temperature rise (from 25°C)

AEC

Q200 +125°C

3530
2520151050051015202530

3540

Current (A rms)

Dimensions are inUS +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 1471-2

inchesmm

Revised 10/26/21© Coilcraft Inc. 2022
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.