Monolithic Power Systems Inc. MCQ1806GS-5-20-AEC1-P

Overview

MCQ1806GS-5-20-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, galvanically isolated Hall-effect current sensor for bidirectional AC/DC current measurement up to ±20A, featuring 3kVRMS isolation, ±2.5% total output error over -40°C to +125°C, 100 mV/A sensitivity at 5V supply, and SOIC-8 package with integrated 0.9mΩ primary conductor. It replaces optocouplers in high-reliability automotive motor control and inverter current monitoring.

For engineers reviewing the MCQ1806GS-5-20-AEC1-P datasheet, MCQ1806GS-5-20-AEC1-P pinout, MCQ1806GS-5-20-AEC1-P application, or MCQ1806GS-5-20-AEC1-P equivalent, this page delivers verified technical context, SOIC-8 terminal mapping, ratiometric analog output behavior, ±20A bidirectional sensing range, and AEC-Q100-compliant thermal and isolation performance - all critical for functional safety–aware power stage design.

Technical Context

The MCQ1806GS-5-20-AEC1-P implements differential Hall sensing with spinning current offset cancellation to reject stray magnetic fields and achieve ±2.5% total output error across its ±20A range. Its internal 0.9mΩ copper conductor enables low-loss current sampling without external shunts.

Galvanic isolation is achieved via reinforced dielectric barrier rated for 3kVRMS withstand and 500VRMS working voltage per IEC62368-1, with 4.2mm creepage/clearance. Bandwidth is adjustable up to 100kHz via external capacitor on FILT pin, while propagation delay remains fixed at 1.5µs and response time at 5µs.

Key Specifications

Pinout & Package

MCQ1806GS-5-20-AEC1-P uses a standard SOIC-8 (5mm × 4mm) surface-mount package with reinforced creepage/clearance for isolation compliance. Primary current terminals (IP+, IP−) are electrically isolated from signal pins (VCC, VOUT, FILT, GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCTR-20AB-T, MCQ1806GS-5-20-AEC1-P delivers higher isolation integrity and automotive qualification; versus TLE4971-20S4, it offers smaller footprint and lower system cost where diagnostics are handled externally.

Availability

MCQ1806GS-5-20-AEC1-P is available at Aetrix Electronics and suitable for automotive traction inverters, on-board chargers, and industrial motor drives requiring stable component supply, AEC-Q100 compliance, and reinforced isolation integrity.

Supply support for MCQ1806GS-5-20-AEC1-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 core expertise in DC/DC converters, LED drivers, and precision analog sensing solutions.

The MCQ1806 product line delivers isolated current sensing for automotive and industrial power systems, designed specifically to replace optocouplers and discrete shunt+amplifier solutions while meeting stringent AEC-Q100 and IEC62368-1 requirements.

FAQ

What is the maximum continuous primary current the MCQ1806GS-5-20-AEC1-P can measure with guaranteed linearity?

The device maintains ±0.5% nonlinearity and ±2.5% total output error across its specified ±20A range. Beyond ±20A, output remains proportional but nonlinearity increases; absolute maximum surge current is 250A (10ms) per IEC61000-4-5 transient testing.

How does the FILT pin affect bandwidth and noise performance?

Connecting a capacitor (CF) between FILT and GND sets the 3dB bandwidth: fBW ≈ 0.35 / tR, where tR is rising time. Larger CF reduces bandwidth and input-referred noise (e.g., 1nF yields ~60kHz and 50mA RMS noise); floating FILT defaults to 100kHz maximum.

Is external calibration required for production systems using this sensor?

No. The MCQ1806GS-5-20-AEC1-P is factory-trimmed for sensitivity and offset, delivering ±2.5% total output error over temperature without system-level calibration. Ratiometric output further eliminates supply voltage dependency.

Can the device operate with a 3.3V supply instead of 5V?

No - MCQ1806GS-5-20-AEC1-P is a 5V-option variant. For 3.3V operation, use MCQ1806GS-3-20-AEC1 (100mV/A sensitivity). Supply voltage is laser-trimmed during manufacturing and not interchangeable across part numbers.

What is the thermal resistance (θJA) of the SOIC-8 package under standard JEDEC conditions?

While θJA is not explicitly published, the device achieves 125°C maximum junction temperature with 0.9mΩ primary resistance and typical 10.5mA supply current. Layout guidance recommends ≥250mm² copper pour under exposed pad (if present) and thermal vias to inner ground planes.

Does the MCQ1806GS-5-20-AEC1-P support bidirectional current sensing in both AC and DC modes?

Yes - the differential Hall architecture and ratiometric output enable accurate measurement of both AC and DC currents across the full ±20A range. Zero-current output is VCC/2 (2.5V), with symmetric positive/negative swing.

How is isolation verified during production testing?

Every unit undergoes 100% production dielectric withstand testing at 3000 VRMS for 60 seconds per IEC62368-1. Additionally, surge testing at 6000V (1.2/50µs) is performed on sample lots per IEC61000-4-5.