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

Overview

MCS1806GS-3-10-Z 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 internal conductor for high-accuracy AC/DC current measurement in high-voltage motor control and power conversion systems.

For engineers reviewing the MCS1806GS-3-10-Z datasheet, MCS1806GS-3-10-Z pinout, MCS1806GS-3-10-Z application, or MCS1806GS-3-10-Z equivalent, this page delivers verified specifications, SOIC-8 package layout, real-world use cases in inverters and fault protection, and validated alternative parts with documented functional differences.

Technical Context

The device implements a spinning-current Hall array with two matched magnetic coupling points (PMCF1 = 0.6 mT/A, PMCF2 = 0.3 mT/A) to cancel stray fields and eliminate hysteresis. Its internal 1.5kΩ filter resistor and 1nF capacitor set baseline bandwidth at 100kHz when FILT is unconnected.

Galvanic isolation is achieved via reinforced dielectric barrier between primary current path (IP+/IP−) and signal side (VCC/VOUT/FILT/GND), rated for 3kVRMS surge and 500VRMS working voltage per IEC62368-1. Propagation delay is 1.5µs and response time is 5µs under full-scale step input.

Key Specifications

Pinout & Package

SOIC-8 package (5mm × 4mm, 1.27mm pitch) with creepage/clearance ≥4.2mm between primary and secondary sides. Primary current path uses dual parallel pins (1&2 = IP+, 3&4 = IP−) for low-inductance, high-current routing; signal side occupies pins 5–8.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCTR-10AU-T and TB9052FG, MCS1806GS-3-10-Z delivers superior isolation robustness, tighter accuracy over temperature, and faster dynamic response-making it optimal for safety-critical motor control and high-reliability power conversion where analog fidelity and timing integrity are mandatory.

Availability

MCS1806GS-3-10-Z 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-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, including DC-DC converters, LED drivers, and precision analog sensors.

The MCS1806 product line targets high-efficiency, space-constrained power systems needing accurate, isolated current feedback-designed specifically for automotive traction inverters, server PSUs, and industrial servo drives.

FAQ

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

The device supports ±10A continuous primary current within its specified accuracy range. At 10A DC, self-heating on a standard 2-layer 1oz copper evaluation board raises junction temperature by ~35°C above ambient. With TA ≤ 90°C and adequate PCB copper area, TJ remains below 125°C-well within the -40°C to +125°C operating limit.

Can the MCS1806GS-3-10-Z measure AC currents up to 10kHz?

Yes. With FILT pin left floating, the device achieves 100kHz small-signal bandwidth-more than sufficient for 10kHz sinusoidal or PWM currents. For noisy environments, adding a 1nF capacitor to FILT reduces bandwidth to ~60kHz while suppressing high-frequency EMI without degrading fundamental current tracking.

How does the ratiometric output improve system accuracy?

The ratiometric design ensures both sensitivity (KSENS = 98–102%) and zero-current output (KVO = 99–101%) scale directly with VCC. When paired with an ADC using the same VCC as its reference, supply voltage variations cancel out-eliminating a major source of gain and offset error in measurement chains.

Is external filtering required on the VOUT pin?

No external RC filter is required for basic operation. The internal 1.5kΩ resistor and 1nF capacitor provide inherent low-pass filtering. However, if system noise exceeds 50mA(RMS) input-referred noise floor, a 10nF capacitor from VOUT to GND further attenuates high-frequency interference without affecting DC accuracy.

What is the minimum recommended copper area for the IP+ and IP− pads?

MPS recommends ≥25mm² of 2oz copper per pad (IP+ and IP− separately) to maintain <1°C/W thermal resistance and limit self-heating. For 10A continuous operation, this keeps temperature rise below 10°C-critical for preserving long-term offset stability and avoiding derating.

Does the MCS1806GS-3-10-Z support bidirectional current sensing in a single-ended supply configuration?

Yes. With 3.3V supply, VOUT centers at 1.65V (VCC/2) at zero current. Positive currents raise VOUT toward 3.3V; negative currents lower it toward 0V. The output remains linear and monotonic across ±10A, enabling true bidirectional measurement without dual supplies or level-shifting circuitry.