Monolithic Power Systems Inc. MCS1806GS-3-10-P

Overview

MCS1806GS-3-10-P from Monolithic Power Systems is a 3.3V single-supply, galvanically isolated Hall-effect current sensor with ±10A bidirectional sensing range, ±2.5% total output error over -40°C to +125°C, and 3kVRMS isolation rating. It integrates differential Hall transducers and a 0.9mΩ primary conductor for high-accuracy AC/DC current measurement in high-noise industrial motor drives and inverters.

For engineers reviewing the MCS1806GS-3-10-P datasheet, MCS1806GS-3-10-P pinout, MCS1806GS-3-10-P application, or MCS1806GS-3-10-P equivalent, this device delivers ratiometric analog output, adjustable bandwidth up to 100kHz via external capacitor, factory-trimmed sensitivity of 132mV/A, and immunity to stray magnetic fields - critical for precision closed-loop control in space-constrained power systems.

Technical Context

The MCS1806GS-3-10-P implements a differential Hall array architecture that cancels external magnetic interference by measuring magnetic field gradients across two integrated sensing points. Its spinning current technique minimizes offset drift, while internal filter components (RFI = 1.5kΩ, CFI = 1nF) enable bandwidth tuning via external CF capacitor.

Galvanic isolation is achieved through reinforced SOIC-8 packaging with 4.2mm creepage and clearance, rated for 3000VRMS withstand voltage and 500VRMS working voltage per IEC62368-1. The device operates with 3.0–3.6V supply, draws 8.5–10.5mA, and features propagation delay of 1.5µs and response time of 5µs at full scale.

Key Specifications

Pinout & Package

SOIC-8 package (5mm × 4mm, 1.5mm height) with reinforced insulation barrier separating primary current path (pins 1–4) from signal side (pins 5–8). Primary terminals are internally paralleled for low-inductance, high-current routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS712ELCTR-10A-T and TMC1100-10A, the MCS1806GS-3-10-P uniquely combines 3.3V operation, SOIC-8 footprint, 3kVRMS isolation, and analog ratiometric output - making it optimal for compact, high-reliability industrial inverters where supply headroom and board space are constrained.

Availability

MCS1806GS-3-10-P is available at Aetrix Electronics and suitable for motor controls, switch-mode power supplies, and over-current fault protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MCS1806GS-3-10-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, with design focus on efficiency, integration, and reliability for industrial, automotive, and computing markets.

The MCS1806 product line delivers isolated current sensing solutions targeting high-density power conversion systems - emphasizing low-loss conduction, magnetic immunity, and simplified system-level safety certification.

FAQ

What is the maximum continuous primary current the MCS1806GS-3-10-P can handle without exceeding junction temperature limits?

The device supports ±10A as its optimized accuracy range, but thermal analysis shows it can sustain ±25A continuously on a 2oz copper PCB with 250mm² thermal pad, assuming TA = 25°C and no forced airflow. Self-heating data indicates ~35°C rise at ±10A, keeping TJ well below 125°C under typical conditions.

Does the MCS1806GS-3-10-P require external calibration for production use?

No. The device is factory-trimmed for sensitivity and offset, delivering ±2.5% total output error across -40°C to +125°C without user calibration. Only system-level gain/offset correction is needed if higher precision is required, leveraging its ratiometric output and known 132mV/A sensitivity.

How does the FILT pin affect noise performance and bandwidth trade-off?

Connecting a capacitor (CF) between FILT and GND sets the 3dB bandwidth per fBW = 1/(2π × 1.5kΩ × (1nF + CF)). A 1nF CF yields ~53kHz bandwidth and ~35mA(RMS) input-referred noise; increasing CF to 10nF lowers bandwidth to ~5.3kHz but reduces noise to ~11mA(RMS), enabling cleaner measurements in low-dynamic applications.

Can the MCS1806GS-3-10-P be used in AC mains-connected equipment?

Yes - its 500VRMS working voltage and 3000VRMS isolation rating comply with IEC62368-1 basic insulation requirements for 250VAC mains applications. External creepage and clearance meet 4.2mm minimums, and the SOIC-8 package is qualified for reinforced insulation in double-insulated designs.

What is the impact of supply voltage variation on measurement accuracy?

VOUT is ratiometric: both sensitivity (KSENS = 98–102%) and zero-current output (KVO = 99–101%) track VCC changes. At 3.0V supply, sensitivity remains within ±2% of nominal 132mV/A, preserving absolute accuracy without additional regulation - critical for battery-powered or unregulated auxiliary rails.

Is the primary conductor rated for high surge currents, such as those in fault conditions?

Yes - the internal conductor passes IEC61000-4-5 surge testing at 3000A (8µs/20µs waveform) and supports 250A transient current for 10ms. This enables robust overcurrent detection in industrial drives where short-circuit currents exceed 1000A before protection triggers.

How does the differential Hall architecture reject external magnetic fields?

The two Hall elements sense magnetic flux density at spatially separated points along the asymmetric primary conductor. Uniform external fields induce identical signals in both sensors, which cancel in the differential amplifier stage. Only the field *gradient* generated by the primary current produces net output - achieving >40dB rejection of 50Hz–1MHz interference.