What this part is and where it fits
The Texas Instruments TMCS1101A4BQDR is a precision isolated Hall-effect current sensor that outputs a ratiometric voltage proportional to the sensed current. It measures both AC and DC current bidirectionally up to 5.75 A, with a sensitivity of 400 mV/A and a bandwidth of 80 kHz. The ±0.5% accuracy and ±0.05% linearity make it suitable for motor-drive phase monitoring, power-supply output sensing, and battery-charger current loops where galvanic isolation is needed without a separate isolator. The 8-SOIC package and surface-mount footprint fit standard pick-and-place assembly, and the -40°C to 125°C operating range covers industrial enclosures and under-hood automotive environments.
Supply and output — what the ratings mean for your BOM
The sensor runs on a single 4.5 V to 5.5 V supply. Maximum supply draw is 6 mA.
Bandwidth and response time — what they buy you
The 80 kHz bandwidth covers the switching frequency of most motor drives and power converters, so you see the ripple waveform, not just the DC average. The 6.5 µs response time means the output settles within one or two PWM cycles — fast enough for overcurrent detection in a drive's firmware loop, but not fast enough for a hardware trip on a sub-microsecond fault. If you need a hardwired desaturation or fast-trip comparator, you'd add an external comparator ahead of this sensor's output.
Package and mounting
The 8-SOIC package (3.90 mm body width) is a standard surface-mount footprint that reflows on a normal lead-free profile. The supplier device package is 8-SOIC, same as the case code. No special clearance or slot in the PCB is needed — the Hall-effect die inside the package provides isolation through the mould compound, not through an air gap.
Lifecycle and sourcing
The TMCS1101A4BQDR is listed as Active with ROHS3 compliance.