By Why We Review Sensors
Sensors are where the physical world meets the digital system, and their datasheets rarely tell the full story. This review examines two Infineon sensing families from the perspective of an FAE who supports customers through design-in and bring-up: the TLE4972 coreless current sensor and the KP236 absolute pressure sensor. Both are measured on typical evaluation setups, with attention to accuracy, layout sensitivity and practical integration.
TLE4972 Coreless Current Sensor
The TLE4972 measures current by sensing the magnetic field around a conductor, without any ferrite core. The differential Hall arrangement rejects stray fields from adjacent conductors, which is the feature that makes the part practical in inverter layouts where busbars carry large currents nearby. The ±35 A variant reviewed here covers the phase currents of a 40 A-class motor drive with margin.
Accuracy in Practice
The device is factory-calibrated, so the accuracy of the measured data depends mostly on the mechanical placement of the conductor relative to the package. The datasheet specifies the recommended conductor geometry; following it closely keeps the accuracy within the stated tolerance. On our evaluation board, the measured error across the current range stayed below one percent of full scale, including the effect of the board trace resistance. Temperature drift was low enough to ignore in a typical motor-drive application without additional compensation.
Interface and Integration
The analog output connects directly to an ADC; the XMC4800 delta-sigma ADC digitizes it with high resolution, and the AURIX TC277 performs the same function in automotive applications. The response time is fast enough for the current loop bandwidth required by field-oriented control. Because there is no core, there is no saturation limit and no hysteresis: the sensor measures the true current waveform, including the switching ripple that control engineers need to observe.
Layout Sensitivity
The conductor path is part of the calibration, so the PCB layout determines the achievable accuracy. The recommended geometry places the conductor directly under the package with a defined width and length. Stray fields from other phases are rejected by the differential structure, which we verified by placing a second current path at increasing distances: the effect on the output stayed within the datasheet specification. This robustness is the main reason we recommend the TLE4972 over shunt-based solutions when isolation is required.
KP236 Absolute Pressure Sensor
The KP236 measures absolute pressure from 10 kPa to 115 kPa, covering manifold pressure, pneumatic control and altitude sensing. The output is analog and ratiometric to the supply, and the sensor is factory-calibrated across the full temperature range.
Measured Performance
On the bench, the KP236 output tracked a calibrated reference within the datasheet accuracy at room temperature and after thermal cycling. The ratiometric behavior means the accuracy depends on the supply stability: feeding the sensor and the ADC from the same reference removes most of the supply sensitivity. The response time is fast enough for pneumatic control loops, and the factory calibration eliminates the trimming step that analog sensors traditionally require on the production line.
Integration Notes
The output connects directly to an MCU ADC; a simple RC filter removes high-frequency noise. The pressure port should be designed so that condensation cannot reach the sensing element, and the package orientation should follow the datasheet recommendation. In the smart appliance applications we support, the KP236 handles filter clog detection and water level monitoring with a single part, reducing BOM count compared with mechanical sensors.
Comparison and Selection Guidance
Choose the TLE4972 when the system needs isolated, wide-bandwidth current measurement without the cost and bulk of current transformers; choose the ±5 A, ±20 A or ±35 A variant to match the current range. Choose the KP236 when the system needs absolute pressure with factory calibration and a simple analog interface. Both families carry automotive-grade temperature ratings, which makes them suitable for industrial applications that demand automotive robustness, and both are covered by BeiLuo's stock and FAE support.
Layout and Production Considerations
The TLE4972 is not a standard component from the layout perspective: the current-carrying conductor must follow the package recommendation, and the sensing element orientation defines which direction the field is measured. Keep adjacent high-current traces away from the sensor area, or account for their contribution in the calibration. The KP236 is more forgiving, but the pressure port orientation and the sealing method determine whether the reading stays stable over temperature cycles. Both devices are offered in automotive-qualified variants, and the same package is available for industrial grades, which allows one layout to serve multiple product tiers. BeiLuo can supply both families with the import documentation that volume production requires.
Final Verdict
Both sensors deliver their datasheet performance with straightforward integration, and the coreless architecture of the TLE4972 removes a real mechanical constraint from inverter design. The factory calibration saves production cost, and the automotive qualification gives industrial designers confidence in field reliability. For engineers evaluating sensing options, we recommend a small evaluation order from BeiLuo to validate the layout and the interface before committing the final design.