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

Datasheet

CSX7045 Series

SMT Current Sense Transformers

The CSX7045 series is a high-isolation, low-loss current sensing transformer designed for high-performance power electronics and automotive applications. It features a compact chip-style package with a low 5.3 mm profile, delivering consistent quality and cost efficiency.

With very low DCR, the series minimizes conduction losses and self-heating, making it ideal for high-current applications up to 20 A+. A wide range of turns ratios from 1:50 to 1:250 provides excellent design flexibility, while bandwidth up to 800 kHz enables accurate high-frequency current measurement in fast-switching systems such as DC-DC converters, motor drives, inverters, and power management circuits. Offering 1800 Vrms isolation, the CSX7045 is ideal for demanding automotive environments.

Very low primary DC resistance
Designed for use up to 800 kHz
1800 Vrms, one minute isolation (hipot) between primary and secondary
Qualified based on AEC-Q200 Rev E
- Solderability: Tested per J-STD-002, Method S1 and Method D

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Specifications

Electrical specifications at 25°C.

Part number 1 (Hover for schematics)	Inductance min (mH) 2	DCR max 3		Turns Ratio	Volt-time product (V-µs) 4	Frequency (kHz)	Current (A) 5	Terminating resistance R_T (Ω) 6	Isolation Voltage (Vrms) 7
Part number 1 (Hover for schematics)	Inductance min (mH) 2	Pri (mΩ)	Sec (Ω)	Pri : Sec	Volt-time product (V-µs) 4	Frequency (kHz)	Current (A) 5	Terminating resistance R_T (Ω) 6	Isolation Voltage (Vrms) 7
CSX7045-050RC	0.38	0.5	1.4	1 : 50	51.75	30 — >800	20.0	2.5	1800
CSX7045-100RC	1.54	0.5	3.8	1 : 100	103.5	14 — >800	20.0	5.0	1800
CSX7045-150RC	3.65	0.5	9.0	1 : 150	155.3	10 — >800	20.0	7.5	1800
CSX7045-175RC	5.32	0.5	12.0	1 : 175	181.1	8 — >800	20.0	8.75	1800
CSX7045-200RC	6.93	0.5	17.3	1 : 200	207	6 — >800	20.0	10.0	1800
CSX7045-250RC	11.06	0.5	22.0	1 : 250	258.7	4 — >800	20.0	12.5	1800

Notes

When ordering, please specify packaging code: e.g. CSX7045-250RC
Inductance is measured at 100 kHz, 0.1 Vrms, 0 ADC on an Agilent 4263B (or equivalent) with a Coilcraft CCF1546 test fixture.
DCR is measured on a Keithley 580 Micro-ohmmeter (or equivalent).
Volt-time product is for the secondary, between pins 3 and 4.
Primary current that causes a 40°C rise from 125°C.
Terminating resistance (R_T) value is based on 1 Volt output with 20 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.
1800 Vrms, one minute isolation (hipot) between primary and secondary.

Termination:

RoHS compliant tin over nickel over silver glass frit (primary). RoHS compliant tin over nickel over copper (secondary).

Packaging:

C = 7" 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).
D = 13" machine-ready reel
EIA-481 embossed plastic tape. Factory order only, not stocked (1500 parts per full reel).

Environmental

Environmental:

RoHS compliant , halogen free

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 + temp rise)

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

See FIT/MTBF Calculations

Performance curves

Temperature Rise vs Current

Schematics

Physical characteristics

Tape and Reel specification

Parts per reel		Reel dimensions (mm)					Tape dimensions (mm)						Orientation
7" (178 mm)	13" (330 mm)	A	B	C	D	E	W	P	Po	P1	H	T
350	1500*	178/300	60/100	13	22,4	16,4	16	8	4	2	5,5	0,4

* Special order

General specification

Core Material:

Ferrite

Weight:

500 – 550 mg

Packaging:

350/7″ reel 1500/13″ reel Plastic tape: 16 mm wide, 0.4 mm thick, 8 mm pocket spacing, 5.5 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):

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

Resistance to soldering heat:

Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles

Refer to Soldering Coilcraft Components before soldering.

PCB Washing:

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

CSX7045 Series

SMT Current Sense Transformers