Monolithic Power Systems Inc. MCS1802GS-50-P

Overview

MCS1802GS-50-P from Monolithic Power Systems is a galvanically isolated, linear Hall-effect current sensor optimized for ±50A bidirectional DC/AC sensing with 26.4 mV/A sensitivity, ±2.5% total output error over -40°C to +125°C, and 2.2kVRMS isolation voltage-used in motor control inverters for real-time phase current feedback.

For engineers reviewing the MCS1802GS-50-P datasheet, MCS1802GS-50-P pinout, MCS1802GS-50-P application, or MCS1802GS-50-P equivalent, key selection criteria include primary conductor resistance (0.9 mΩ), ratiometric 3.3V analog output, adjustable bandwidth up to 100 kHz via external FILT capacitor, and SOIC-8 package compatibility with high-density power board layouts.

Technical Context

The MCS1802GS-50-P implements a differential Hall array architecture that cancels stray magnetic fields, with two physically separated Hall plates (PMCF1 = 0.6 mT/A, PMCF2 = 0.3 mT/A) sensing magnetic field gradients across an integrated low-resistance primary conductor. Its spinning current offset cancellation ensures stable zero-current output (VOUT(Q) = VCC/2) with ±10 mV offset drift over temperature.

Galvanic isolation is achieved via internal dielectric barrier between primary current path (IP+/IP−) and signal pins (VCC/VOUT/FILT/GND), rated at 2.2kVRMS withstand voltage per IEC62368-1 and 6kV surge capability per IEC61000-4-5. Bandwidth is programmable from 10 kHz to 100 kHz using an external capacitor on FILT, leveraging internal RFi = 1.5 kΩ and CFi = 1 nF.

Key Specifications

Pinout & Package

Package: SOIC-8 (5 mm × 4 mm), surface-mount, RoHS-compliant, MSL Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCB-50AB-T, MCS1802GS-50-P delivers tighter ±2.5% error over full temperature range on 3.3 V rail, while TLE4971-50S4 trades analog simplicity for digital diagnostics and higher isolation-making MCS1802GS-50-P optimal for cost-sensitive, high-accuracy analog feedback loops.

Availability

MCS1802GS-50-P is available at Aetrix Electronics and suitable for motor control inverters, automotive battery monitoring, and industrial switch-mode power supplies requiring stable component supply with guaranteed long-term availability.

Supply support for MCS1802GS-50-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 high-efficiency power conversion systems, targeting space-constrained, thermally demanding applications such as EV traction inverters and server PSUs where accuracy, isolation, and minimal board area are critical.

FAQ

What is the maximum continuous primary current the MCS1802GS-50-P can handle without damage?

The device supports continuous primary currents up to ±50 A within its specified accuracy range. Absolute maximum surge current is 3000 A (8 µs/20 µs pulse), and transient rating is 250 A (10 ms single peak). Thermal limits depend on PCB copper area; at 50 A RMS, junction temperature rise is <3°C with 2 oz copper and 2 cm² thermal pad per side.

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 RFi = 1.5 kΩ and CFi = 1 nF, setting bandwidth per fBW = 1/(2π × RFi × (CF + CFi)). A 10 nF CF yields ~10 kHz bandwidth and reduces input-referred noise from 50 mA(RMS) to ~15 mA(RMS), improving SNR for low-frequency monitoring.

Is the MCS1802GS-50-P compatible with 5 V microcontrollers?

No-the output is ratiometric to 3.3 V supply only. VOUT swings 0–3.3 V and is not 5 V tolerant. Direct connection to a 5 V MCU ADC requires level-shifting or a 3.3 V–compatible MCU. The 3.3 V supply must remain within 3.0–3.6 V; exceeding 3.6 V risks damage per absolute maximum ratings.

Does the device require calibration for zero-current offset in production?

No-factory trimming ensures ±10 mV offset voltage over −40°C to +125°C, translating to ±0.38 A error at ±50 A range. This eliminates production-line offset calibration. System-level gain calibration may still be applied for highest accuracy, but is optional due to ±2.5% total output error guarantee.

Can the MCS1802GS-50-P measure AC current waveforms accurately at 50/60 Hz?

Yes-its 100 kHz bandwidth and <5 µs response time fully support 50/60 Hz sinusoidal current measurement with negligible phase lag (<0.01° at 60 Hz). The differential Hall architecture rejects 50/60 Hz magnetic interference from nearby transformers or inductors, ensuring clean waveform capture.

What is the minimum recommended PCB copper area for thermal management at 50 A?

For continuous 50 A operation, MPS recommends ≥2 cm² of 2 oz copper on both top and bottom layers connected via ≥8 thermal vias under the SOIC-8 body. With this layout, thermal resistance from junction to ambient is ~35°C/W, limiting junction rise to <3°C at 50 A-well below the 125°C max operating temperature.

How is galvanic isolation verified in production?

Every unit undergoes 100% production testing per IEC62368-1 for 2.2 kVRMS withstand voltage at 60 seconds. Additionally, dielectric surge strength is validated per IEC61000-4-5 with ±5 pulses at 6 kV, ensuring reliability in harsh EMI environments like industrial motor drives.