Monolithic Power Systems Inc. MCS1802GS-50-Z

Overview

MCS1802GS-50-Z from Monolithic Power Systems is a 3.3V linear Hall-effect current sensor with galvanic isolation, ±50A bidirectional sensing range, ±2.5% total output error over temperature (−40°C to +125°C), 26.4 mV/A sensitivity, and 0.9 mΩ internal conductor resistance-used in motor control and over-current protection circuits where high accuracy and magnetic immunity are required.

For engineers reviewing the MCS1802GS-50-Z datasheet, MCS1802GS-50-Z pinout, MCS1802GS-50-Z application, or MCS1802GS-50-Z equivalent, key selection criteria include isolation voltage (2.2 kVRMS), ratiometric output behavior, adjustable bandwidth via external FILT capacitor, and SOIC-8 footprint compatibility with space-constrained PCB layouts.

Technical Context

The MCS1802GS-50-Z implements a differential Hall array architecture that cancels stray magnetic fields, enabling stable operation in noisy environments. Its spinning current technique minimizes offset drift, while factory trimming ensures ±2.5% total output error across −40°C to +125°C.

Galvanic isolation between primary current path (IP+/IP−) and signal pins (VCC/VOUT/FILT/GND) provides 2.2 kVRMS withstand voltage per IEC62368-1, replacing optocouplers in isolated current monitoring. Bandwidth is adjustable up to 100 kHz via external capacitor on FILT pin, with 4 µs output rise time and 1.5 µs propagation delay.

Key Specifications

Pinout & Package

Package: SOIC-8 (5 mm × 4 mm), surface-mount, with primary current terminals (IP+, IP−) physically separated from signal pins (VCC, VOUT, FILT, GND) to maintain galvanic isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCTR-50AB-T and TLE4972-50S4-10-1-50, the MCS1802GS-50-Z delivers superior speed (4 µs vs. ≥8 µs), native 3.3 V operation, and lower conductor loss (0.9 mΩ vs. ≥1.2 mΩ), making it optimal for high-efficiency, space-constrained, and low-voltage embedded systems.

Availability

MCS1802GS-50-Z is available at Aetrix Electronics and suitable for motor control, automotive battery management, and switch-mode power supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MCS1802GS-50-Z 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 conversion, LED drivers, and precision analog sensing solutions.

The MCS1802 product line delivers isolated, high-accuracy current sensing for demanding power electronics applications-including EV traction inverters, industrial servo drives, and telecom rectifiers-where reliability, miniaturization, and thermal efficiency are critical.

FAQ

What is the maximum continuous primary current rating for MCS1802GS-50-Z?

The MCS1802GS-50-Z is rated for ±50 A continuous primary current with guaranteed ±2.5% total output error across −40°C to +125°C. Its 0.9 mΩ internal conductor resistance results in only 2.25 W of power dissipation at ±50 A, enabling operation without forced air cooling in typical PCB layouts.

How does the FILT pin affect bandwidth and noise performance?

Connecting an external capacitor (CF) between FILT and GND forms a first-order RC filter with internal RFi (1.5 kΩ) and CFi (1 nF), reducing bandwidth per fBW = 1/(2π × RFi × (CF + CFi)). A 1 nF CF lowers bandwidth to ~100 kHz; increasing CF to 10 nF reduces it to ~10 kHz, lowering output noise from 50 mA(RMS) to ~16 mA(RMS) at 60 kHz.

Can MCS1802GS-50-Z replace optocoupler-based current sensors?

Yes-the device provides 2.2 kVRMS galvanic isolation with 4.2 mm creepage/clearance, meeting IEC62368-1 requirements. Unlike optocouplers, it offers ratiometric analog output, no LED aging, and superior temperature stability (±2.5% error vs. ±5–10% for opto-based solutions), making it a direct drop-in replacement in feedback loops.

What is the zero-current output voltage and how is it trimmed?

VOUT(Q) is factory-trimmed to VCC/2 (1.65 V at 3.3 V), with offset voltage VOE limited to ±10 mV over −40°C to +125°C. This corresponds to ±0.38 A equivalent current error at 26.4 mV/A sensitivity. Trim is performed using laser or EEPROM-based calibration during final test, ensuring stability over lifetime.

Does MCS1802GS-50-Z support AC and DC current measurement equally?

Yes-the differential Hall architecture responds identically to AC and DC magnetic fields generated by the primary conductor. Its 100 kHz bandwidth supports sinusoidal currents up to 15.9 kHz (−3 dB point), and its 4 µs rise time enables accurate capture of fast transients such as inverter switching edges or fault surges.

What PCB layout considerations ensure optimal magnetic immunity?

Place the MCS1802GS-50-Z away from strong external magnetic sources (e.g., transformers, inductors). Orient the SOIC-8 package so the IP+ and IP− leads run perpendicular to dominant stray field vectors. Use symmetric copper pours on layer 2 beneath IP+ and IP− to minimize field coupling asymmetry-critical for maintaining <0.5% nonlinearity.

Is the SOIC-8 package lead-free and RoHS-compliant?

Yes-MCS1802GS-50-Z is fully lead-free, halogen-free, and compliant with EU RoHS Directive 2011/65/EU. The SOIC-8 package uses matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1, allowing unlimited floor life at ≤30°C/60% RH.