Monolithic Power Systems Inc. MCS1823GQTE-540BRN-P

Overview

MCS1823GQTE-540BRN-P from Monolithic Power Systems is a bidirectional linear Hall-effect current sensor IC with integrated over-current detection (OCD), designed for high-accuracy AC/DC current sensing in space-constrained power systems. It features ±40A rated current range, 50 mV/A sensitivity, 0.6 mΩ internal conductor resistance, 120 kHz bandwidth, and operates from a 5V supply. It delivers ratiometric analog output voltage proportional to primary current and supports fast OCD response within 1 µs.

For engineers reviewing the MCS1823GQTE-540BRN-P datasheet, MCS1823GQTE-540BRN-P pinout, MCS1823GQTE-540BRN-P application, or MCS1823GQTE-540BRN-P equivalent, this device is selected for precision motor control feedback, real-time fault protection in SMPS, and compact current monitoring where isolation, low offset drift, and gradient field immunity are critical.

Technical Context

The MCS1823GQTE-540BRN-P employs a differential Hall array architecture that cancels external magnetic field gradients, enabling operation in noisy electromagnetic environments. Its spinning current technique minimizes offset drift across temperature, while factory trimming ensures ±2.5% total output error over -40°C to +125°C.

It integrates a dedicated open-drain /OCD output with user-configurable threshold (50–240% of IPMAX via external pull-up resistor) and 1 µs response time. The TQFN-12 package embeds the primary conductor (IP+/IP−) with 100 VPK basic isolation per IEC62368-1, eliminating need for external shunts or isolated amplifiers.

Key Specifications

Pinout & Package

TQFN-12 (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad; ultra-small footprint optimized for dense PCB layouts and thermally demanding applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear Hall-effect current sensing applications.

Compared with ACS724LLCTR-40AB-T and TLE4971-25S4-10-1-5-SP, the MCS1823GQTE-540BRN-P uniquely combines ultra-small TQFN-12 packaging, integrated 1 µs OCD, and ratiometric analog output-making it optimal for compact, high-speed, analog-centric current monitoring where board area and fault latency are critical.

Availability

MCS1823GQTE-540BRN-P is available at Aetrix Electronics and suitable for motor control, switch-mode power supplies, and automotive on-board chargers requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MCS1823GQTE-540BRN-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with expertise in DC/DC converters, LED drivers, and precision analog sensors.

The MCS1823 product line is engineered for high-accuracy, isolated current sensing in compact power conversion and motor drive systems-emphasizing magnetic immunity, low thermal drift, and integration of protection features like OCD.

FAQ

What is the maximum continuous current the MCS1823GQTE-540BRN-P can measure?

The device is rated for ±40A continuous bidirectional current (IPMAX = ±40A). Its 0.6 mΩ internal conductor allows sustained operation at this level with <1 W power dissipation. Beyond ±40A, output remains proportional but nonlinearity increases beyond the guaranteed ±2.5% total error band.

Does the /OCD pin require an external pull-up resistor?

Yes. The /OCD pin is open-drain and must be pulled up to VCC using a resistor between 10 kΩ and 500 kΩ. This resistor sets the OCD threshold: lower values increase threshold percentage of IPMAX, enabling fine-grained fault margin tuning from 50% to 240% of ±40A.

Is the VOUT output ratiometric or absolute for this part number?

MCS1823GQTE-540BRN-P uses the "R" suffix in its part numbering (GQTE-540BRN), indicating ratiometric output mode. At zero current, VOUT = 0.5 × VCC (2.5 V typical with 5V supply), and full-scale output scales linearly with supply voltage variations.

Can the MCS1823GQTE-540BRN-P replace a shunt resistor + op-amp solution?

Yes-it replaces both components with galvanic isolation, no external gain calibration, and immunity to thermal EMF and PCB layout parasitics. Its 0.6 mΩ conductor eliminates shunt power loss and self-heating issues, while integrated Hall sensing avoids op-amp offset drift and common-mode rejection limitations.

What is the isolation rating, and does it meet safety standards?

The device provides basic isolation with VIOWM = 100 VPK or VDC per IEC62368-1. It is not rated for reinforced or functional isolation. For safety-critical applications requiring >100 V working voltage or creepage/clearance compliance, external isolation or certified alternatives must be used.

How does the differential Hall array improve accuracy in noisy environments?

The dual Hall transducers sense magnetic field differences at two spatially separated points along the conductor. Stray uniform or gradient fields induce equal voltages in both sensors, which cancel out in the differential amplifier stage-leaving only the field generated by the measured current, rejecting >95% of external EMI-induced errors.

What PCB layout guidelines ensure optimal thermal performance?

Mount the TQFN-12 on a 200 mm² copper pour connected to GND via ≥4 thermal vias (0.3 mm diameter) under the exposed pad. Keep IP+ and IP− traces wide (>2 mm) and symmetric to minimize inductance imbalance. Avoid routing sensitive analog traces near switching nodes or high-current paths.