Monolithic Power Systems Inc. MCS1802GS-10-P

Overview

MCS1802GS-10-P from Monolithic Power Systems is a galvanically isolated, linear Hall-effect current sensor optimized for ±10A bidirectional DC/AC sensing with ±2.5% total output error over -40°C to +125°C, 3.3V single supply, and 2.2kVRMS isolation. It integrates differential Hall sensing, spinning-current offset cancellation, and an internal 0.9mΩ primary conductor-enabling high-accuracy motor phase current monitoring in space-constrained industrial inverters.

For engineers reviewing the MCS1802GS-10-P datasheet, MCS1802GS-10-P pinout, MCS1802GS-10-P application, or MCS1802GS-10-P equivalent, key selection criteria include its ratiometric 132mV/A sensitivity, 4µs output rise time, ±10A accuracy range, SOIC-8 footprint with integrated primary path, and isolation compliance per IEC62368-1.

Technical Context

The MCS1802GS-10-P implements a differential Hall array with two physically separated sensing points (PMCF1 = 0.6mT/A, PMCF2 = 0.3mT/A) to reject stray magnetic fields. Its spinning-current technique and factory-trimmed transducer gain deliver stable offset voltage (±10mV over temperature) and <0.5% nonlinearity across full scale.

Bandwidth is adjustable up to 100kHz via external capacitor on FILT pin, leveraging internal 1.5kΩ filter resistance and 1nF capacitance. Galvanic isolation is achieved through physical separation of primary (IP+/IP−) and signal (VCC/VOUT/FILT/GND) terminals, with 4.2mm creepage/clearance and 2.2kVRMS withstand rating.

Key Specifications

Pinout & Package

Package: SOIC-8 (5mm × 4mm), surface-mount, with integrated primary current path and signal-side isolation barrier.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS712ELCTR-10B-T, MCS1802GS-10-P offers tighter ±2.5% error and 3.3V compatibility; versus TLE4971-2C5-S0001, it provides simpler analog integration and lower cost where digital output isn't needed.

Availability

MCS1802GS-10-P is available at Aetrix Electronics and suitable for motor control, automotive battery management, and industrial switch-mode power supplies requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MCS1802GS-10-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, including DC-DC converters, LED drivers, and precision analog sensors.

The MCS1802 product line delivers isolated current sensing for industrial motor drives and automotive subsystems, emphasizing accuracy, thermal stability, and ease of layout with integrated primary conductors.

FAQ

What is the maximum continuous primary current the MCS1802GS-10-P can handle?

The device is rated for ±10A continuous primary current with guaranteed ±2.5% total output error. It supports transient surges up to 250A (10ms) and 3000A (8µs/20µs pulse) per IEC61000-4-5, but sustained operation beyond ±10A increases nonlinearity and thermal stress on the 0.9mΩ conductor.

How does the FILT pin affect bandwidth and noise performance?

Connecting a capacitor (CF) between FILT and GND forms a first-order RC filter with internal 1.5kΩ resistance and 1nF capacitance. A 1nF CF yields ~100kHz bandwidth; increasing CF reduces bandwidth and input-referred noise-for example, 10nF lowers bandwidth to ~10kHz and cuts 60kHz noise from 50mA(RMS) to ~16mA(RMS).

Is external calibration required for accuracy over temperature?

No. The MCS1802GS-10-P is factory-trimmed for sensitivity and offset, achieving ±2.5% total output error from -40°C to +125°C without user calibration. Offset voltage drift is limited to ±10mV over temperature, and sensitivity error remains within ±2% across the full range.

Can the MCS1802GS-10-P replace optocoupler-based current sensing circuits?

Yes. With 2.2kVRMS isolation, 4.2mm creepage/clearance, and IEC62368-1 certification, it replaces optocouplers in reinforced insulation applications. Unlike optocouplers, it provides analog linearity, no LED aging, and superior temperature stability-ideal for motor control feedback loops.

What is the recommended PCB layout for minimizing noise coupling?

Separate primary (IP+/IP−) and signal (VCC/VOUT/GND/FILT) copper areas with ≥4.2mm clearance. Place the 1µF VCC bypass capacitor within 2mm of pin 8. Route FILT traces away from noisy switching nodes. Use a solid GND plane under signal pins and avoid routing high-dI/dt traces near VOUT or FILT.

Does the device support unidirectional current measurement?

Yes. Though specified for ±10A bidirectional operation, it functions unidirectionally with 0A to +10A or 0A to −10A. The output spans VCC/2 ±1.32V (at 10A), so a 3.3V supply gives 0.3V–3.0V output range-compatible with most 3.3V ADCs without level-shifting.

What is the power-on time and how does it impact system startup?

Power-on time is 90µs-defined as the interval from VCC crossing 2.5V UVLO threshold to VOUT settling within 10% of final value. This enables rapid system initialization in motor drives and power supplies where current sensing must be active before first PWM cycle.