CT4031
© 2023 Crocus Technology
CT4031 · Rev. 0.2
1
PRELIMINARY DATASHEET
XtremeSense® TMR Current Sensor with Common-Mode Field
Rejection and 5 kV
RMS
Galvanic Isolation in SOICW-16 Package
FEATURES
• 20 A to 65 A Unipolar and Bipolar Range
• 500 kHz Bandwidth
• Common-Mode Field Rejection
• 0.5 m Primary Conductor Resistance
• Ratiometric Output from Supply Voltage
• ±3% Max Total Error from -40°C to 125°C
• UL/IEC 62387 Certification
o Rated Isolation Voltage 5 kV
RMS
o Basic Isolation Working voltage 1287 V
RMS
o Reinforced Isolation Working Voltage 647 V
RMS
• Supply Voltage: 3.3 V or 5.0 V
• Available in 16-lead SOICW Package
PRODUCT DESCRIPTION
The CT4031 is a highly linear, XtremeSense® TMR based
Current Sensor. The TMR sensor is differential which
enables common-mode field rejection to cancel out stray
magnetic fields. The primary conductor is only 0.5 m
which enables the sensor to withstand high in-rush current
and minimize power loss. The current applied to the pin of
the primary conductor generates an internal differential
magnetic field. The TMR sensor provides a proportional
voltage to the differential magnetic field while rejecting
common-mode stray magnetic fields.
The pins of the primary conductive path and the sensor
leads are galvanically isolated. This enables high-side
current sensing without the need for additional isolation
techniques. The CT4031 is offered in an industry standard
16-lead SOICW package that is “green” and RoHS
compliant. The small footprint and low-profile footprint are
well suited for space-constrained applications.
PACKAGE: 16-lead SOICW (SWF suffix)
APPLICATIONS
• Motor Control
• Power Inverters
• UPS, SMPS and Telecom Power Supplies
• Consumer and Enterprise Electronics
TYPICAL APPLICATION
CT4031
© 2023 Crocus Technology
CT4031 · Rev. 0.2
2
PRELIMINARY DATASHEET
Part Ordering Information
Part Number
Current Range
(I
PMAX
)
Sensitivity
(mV/A)
V
CC
= 3.3V
Sensitivity
(mV/A)
V
CC
= 5.0V
Polarity
Package
CT4031-H20BSWF
±20
66
100
Bidirectional
16-lead SOICW
4.89 6.00 1.62 mm
CT4031-H30BSWF
±30
44
66.66
CT4031-H40BSWF
±40
33
50
CT4031-H50BSWF
±50
26.4
40
CT4031-H65BSWF
±65
20.3
30.77
CT4031-H30USWF
30
88
133.33
Unidirectional
CT4031-H40USWF
40
66
100
Evaluation Board Ordering Information
Part Number
Current Range (I
PMAX
)
Polarity
Operating Temperature Range
CTD4031-20B
±20
Bidirectional
-40°C to +125°C
CTD4031-30B
±30
CTD4031-40B
±40
CTD4031-50B
±50
CTD4031-65B
±65
CTD4031-30U
30
Unidirectional
CTD4031-40U
40