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

3D Model Datasheet

CST4835 Series

SMT Current Sense Transformers

Senses current up to 7 Amps
Designed for use between 11 kHz to 1 MHz and above
9 turns ratios to meet variety of requirements
AEC-Q200 Grade 1 (−40°C to +125°C)

Need parts for space, military or other critical applications?
See Coilcraft AE475TCB Series

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Part number

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Count	Unit price
1	$1.83
250	$1.56
500	$1.36
1000	$1.19
2500	$1.02
5000	$0.93

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

Packaging

C = 7" machine-ready reel

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Specifications

Electrical specifications at 25°C.

Part number 1 (Hover for schematics)	Inductance min (µH) 2	DCR max (Ω)		Turns Ratio	Volt-time product (V-µs) 3	Frequency (kHz) 4	Current (A) 5	Terminating resistance R_T (Ω) 6	Isolation Voltage (Vrms) 7
Part number 1 (Hover for schematics)	Inductance min (µH) 2	Pri	Sec	Pri : Sec	Volt-time product (V-µs) 3	Frequency (kHz) 4	Current (A) 5	Terminating resistance R_T (Ω) 6	Isolation Voltage (Vrms) 7
CST4835-020E_	33	0.0030	0.35	1 : 20	6	83 — >1000	7.0	2.9	500
CST4835-030E_	74	0.0030	0.90	1 : 30	9	56 — >1000	7.0	4.3	500
CST4835-040E_	132	0.0030	1.6	1 : 40	12	42 — >1000	7.0	5.7	500
CST4835-050E_	205	0.0030	2.5	1 : 50	15	33 — >1000	7.0	7.1	500
CST4835-060E_	295	0.0030	3.6	1 : 60	18	28 — >1000	7.0	8.6	500
CST4835-070E_	400	0.0030	4.6	1 : 70	21	24 — >1000	7.0	10.0	500
CST4835-100E_	820	0.0030	9.5	1 : 100	30	17 — >1000	7.0	14.3	500
CST4835-125E_	1280	0.0030	13.0	1 : 125	37.5	13 — >1000	7.0	17.9	500
CST4835-150E_	1800	0.0030	21.0	1 : 150	45	11 — >1000	7.0	21.4	500

Notes

When ordering, please specify packaging code: e.g. CST4835-150EC
Inductance measured between secondary pins at 100 kHz, 0.1 Vrms, 0 Adc.
Volt-time product is for the secondary, between pin 1 and 2.
For specific questions regarding frequency range, please contact us at [email protected].
Primary current of 7 A causes approximately 25°C temperature rise above 25°C ambient. Higher current causes a greater temperature rise (see Temperature Rise vs Current curve).
Terminating resistor value is based on 1 Volt output with 7 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.
500 Vrms, one minute isolation (hipot) winding to winding.

Termination:

RoHS compliant tin-silver over tin over nickel over copper (pins 2 – 1); RoHS compliant tin over nickel over copper (pins 4 – 3).

Packaging:

C = 7″ machine-ready reel. EIA-481 embossed plastic tape (500 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
B = Less than full reel. In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to C.
D = 13″ machine-ready reel. EIA-481 embossed plastic tape (2200 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 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
500	2200*	178/330	60/100	13	18,4	12,4	12	8	4	2	6,6	0,35

General specification

Core Material:

Ferrite

Weight:

115 – 122 mg

Packaging:

500/7″ reel; 2200/13″ reel; Plastic tape: 12 mm wide, 0.35 mm thick, 8 mm pocket spacing, 3.6 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):

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

Resistance to soldering heat:

38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332

Refer to Soldering Coilcraft Components before soldering.

PCB Washing:

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

CST4835 Series

SMT Current Sense Transformers