Monolithic Power Systems Inc. MCS1806GS-5-30-P

Overview

MCS1806GS-5-30-P from Monolithic Power Systems is a galvanically isolated, bidirectional Hall-effect current sensor with 5V supply, ±30A primary current range, ±2.5% total output error, 3kVRMS isolation voltage, and SOIC-8 package. It replaces optoisolators in high-voltage motor control and power supply feedback loops by sensing AC/DC current via differential Hall plates and internal low-resistance (0.9mΩ) conductor.

For engineers reviewing the MCS1806GS-5-30-P datasheet, MCS1806GS-5-30-P pinout, MCS1806GS-5-30-P application, or MCS1806GS-5-30-P equivalent, key selection criteria include working voltage (500VRMS), ratiometric analog output, adjustable bandwidth up to 100kHz, and immunity to stray magnetic fields via spinning-current offset cancellation.

Technical Context

The device integrates two matched Hall plates with asymmetric primary conductor geometry to generate differential magnetic field sensing (PMCF1 = 0.6 mT/A, PMCF2 = 0.3 mT/A), enabling rejection of common-mode external fields. Its internal signal chain includes dynamic offset cancellation, factory-trimmed sensitivity (66 mV/A), and ratiometric scaling of both zero-current output (VCC/2) and gain.

Isolation is achieved through reinforced dielectric barrier between primary current path (IP+/IP−) and signal side (VCC/VOUT/FILT/GND), certified to IEC62368-1 with 3000VRMS withstand voltage and 500VRMS working voltage. Bandwidth is set either internally (100kHz) or externally via capacitor on FILT pin, using RFI = 1.5kΩ and CFI = 1nF internal filter network.

Key Specifications

Pinout & Package

SOIC-8 package (5mm × 4mm, 1.27mm pitch) with reinforced creepage/clearance (4.2mm) between primary and secondary sides. Primary current path uses dual parallel pins (IP+, IP−) for low-inductance, high-current routing; signal side provides analog output referenced to VCC/2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCTR-30AB-T and TMC1100A1DQNT, the MCS1806GS-5-30-P uniquely balances 3000VRMS certification, ±2.5% guaranteed accuracy over full temperature range, and user-adjustable bandwidth-making it optimal for cost-sensitive yet safety-compliant industrial inverters and OBCs.

Availability

MCS1806GS-5-30-P is available at Aetrix Electronics and suitable for motor controls, switch-mode power supplies, automotive onboard chargers, and industrial load management requiring stable component supply with full traceability and long-lifecycle support.

Supply support for MCS1806GS-5-30-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 applications.

The MCS1806 product line delivers isolated current sensing solutions targeting space-constrained, high-voltage systems where accuracy, safety certification, and minimal external components are critical-such as inverters, EV chargers, and industrial power supplies.

FAQ

What is the maximum continuous primary current the MCS1806GS-5-30-P can handle without exceeding its 165°C junction limit?

The device supports ±30A continuous primary current under standard PCB conditions (2oz copper, 1in² thermal pad). At this level, self-heating remains below 15°C above ambient (25°C), keeping junction temperature well within the 165°C absolute maximum. Derating is required above 85°C ambient or with reduced copper area.

Can the MCS1806GS-5-30-P measure AC current at 50/60Hz with full accuracy?

Yes. The device maintains ±2.5% total output error across its full ±30A range at 50/60Hz, with negligible phase shift (<0.5°) and no magnetic hysteresis. Its differential Hall architecture inherently rejects 50/60Hz magnetic interference from nearby transformers or conductors.

How does the FILT pin affect bandwidth and noise performance?

Connecting a capacitor (CF) between FILT and GND forms a first-order low-pass filter with internal RFI (1.5kΩ) and CFI (1nF), reducing bandwidth per fBW = 1/(2π × RFI × (CF + CFI)). A 1nF CF lowers bandwidth to ~100kHz; 10nF reduces it to ~10kHz, cutting RMS noise from 50mA to ~16mA (60kHz BW).

Is the output truly ratiometric, and how is that verified?

Yes. Ratiometry is confirmed by KSENS (98–102%) and KVO (99–101%) coefficients measured across VCC = 4.5–5.5V. This means both sensitivity and zero-current output (VCC/2) scale linearly with supply voltage, ensuring consistent current measurement even with ±10% rail variation.

Does the MCS1806GS-5-30-P require calibration after soldering or during system operation?

No factory or field calibration is required. Offset voltage is trimmed during production, and lifetime drift is limited to ±1% for total output error. The spinning-current technique and differential Hall structure eliminate thermal and process-induced offsets, enabling plug-and-play deployment.

What is the minimum recommended copper area for thermal management on the primary current path?

A minimum of 100mm² (10mm × 10mm) of 2oz copper per IP+ and IP− trace is recommended for continuous ±30A operation at 25°C ambient. Increasing copper area to 200mm² reduces thermal resistance by ~30%, further limiting self-heating and extending lifetime reliability.