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Introduction
Specifications
Environmental
Performance curves
Schematics
Physical characteristics
Tape & Reel
Soldering/Washing

3D Model Datasheet

CST1211 Series

SMT Current Sense Transformers

Sensed current up to 28 Amps
Designed for use up to 1 MHz and above
Very low primary resistance
AEC-Q200 Grade 1 (−40°C to +125°C)
UL Class 180 (H) insulating materials, UL 1446 Class F (155°C) Insulation System (UL File E83628 CC-5D marking)
Bobbin plastic UL 94-V0, CTI PLC3
Pri/Sec: 9 mm creepage and 8 mm clearance
- Creepage distance: Pri/Sec: 9 mm; Pri/Core: 5 mm
- Clearance distance: Pri/Sec: 8 mm; Pri/Core: 4 mm

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See Coilcraft ST614TCB Series

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Count	Unit price
1	$3.90
350	$3.13
700	$1.88
1400	$1.48
2800	$1.27
5000	$1.16

For high volume or non-stock items, request a quote.

Termination

L = Tin-silver-copper over tin over nickel

Packaging

D = 13" machine-ready reel

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Specifications

Electrical specifications at 25°C.

Part number (Hover for schematics)	Inductance min (mH) 1	DCR max (Ω)		Turns Ratio	Volt-time product (V-µs) 2	Frequency (kHz) 3	Current (A) 4	Terminating resistance R_T (Ω) 5	Isolation Voltage (Vrms) 6
Part number (Hover for schematics)	Inductance min (mH) 1	Pri	Sec	Pri : Sec	Volt-time product (V-µs) 2	Frequency (kHz) 3	Current (A) 4	Terminating resistance R_T (Ω) 5	Isolation Voltage (Vrms) 6
CST1211-050LD	1.7	0.0015	0.65	1 : 50	106	33 — >1000	28.0	1.8	3000
CST1211-070LD	3.0	0.0015	1.4	1 : 70	148.4	24 — >1000	28.0	2.5	3000
CST1211-100LD	7.0	0.0015	2.8	1 : 100	212	17 — >1000	28.0	3.6	3000
CST1211-125LD	11.0	0.0015	4.9	1 : 125	265	13 — >1000	28.0	4.5	3000
CST1211-200LD	32.0	0.0015	10.4	1 : 200	424	11 — >1000	28.0	7.1	3000

Notes

Inductance measured between secondary pins at 100 kHz, 0.1 Vrms, 0 Adc.
Volt-time product is for the secondary, between pin 4 and 5.
For specific questions regarding frequency range, please contact us at [email protected].
Primary current of 28 A causes less than 40°C temperature rise from 25°C ambient. Higher current causes a greater temperature rise.
Terminating resistance (R_T) 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:
R_T (Ohms) = V_out × N_sec / I_in.
3000 Vrms, one minute isolation (hipot) winding to winding.

Termination:

RoHS-compliant. 260°C compatible. Tin-silver-copper over tin over nickel over copper terminations.

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).

Environmental

Environmental:

RoHS compliant

Ambient temperature range:

−40°C to +125°C

Storage temperature range:

Component: −40°C to +165°C
Tape and reel packaging: −40°C to +80°C

Maximum part temperature:

+165°C (Ambient + temperature rise)

Failures in Time (FIT) / Mean Time Between Failures (MTBF):

See FIT/MTBF Calculations

Performance curves

Temperature vs Current

Schematics

Physical characteristics

Tape and Reel specification

Parts per reel	Reel dimensions (mm)					Tape dimensions (mm)						Orientation
13" (330 mm)	A	B	C	D	E	W	P	Po	P1	H	T
350	330	100	13	30,4	24,4	24	16	4	2	11,6	0,5

General specification

Core Material:

Ferrite

Weight:

2.6 g

Packaging:

350/13″ reel; Plastic tape: 24 mm wide, 0.5 mm thick, 16 mm pocket spacing, 11.6 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):

1 (unlimited floor life at <30°C / 85% relative humidity

Resistance to soldering heat:

Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.

Refer to Soldering Coilcraft Components before soldering.

PCB Washing:

Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

CST1211 Series

SMT Current Sense Transformers