Monolithic Power Systems Inc. MCQ1806GS-5-05-AEC1-Z

Overview

MCQ1806GS-5-05-AEC1-Z 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 ±5A, featuring ±2.5% total output error, 400 mV/A sensitivity at 5V supply, and 3kVRMS isolation. It integrates a 0.9mΩ primary conductor and differential Hall sensing for stray-field immunity, deployed in automotive motor control and on-board charger systems.

For engineers reviewing the MCQ1806GS-5-05-AEC1-Z datasheet, MCQ1806GS-5-05-AEC1-Z pinout, MCQ1806GS-5-05-AEC1-Z application, or MCQ1806GS-5-05-AEC1-Z equivalent, this page delivers verified technical context, SOIC-8 package mapping, real-world automotive use cases, and validated alternative options with documented functional trade-offs.

Technical Context

The device implements a differential Hall array with spinning current offset cancellation, enabling stable zero-current output (VOUT(Q) = VCC/2) and <±15mV offset voltage over –40°C to +125°C. Its internal 1.5kΩ filter resistor and 1nF capacitor set a base bandwidth of 100kHz, adjustable via external CF on FILT–GND.

Galvanic isolation separates primary current path (IP+/IP−) from signal pins (VCC/VOUT/FILT/GND), achieving 3kVRMS withstand voltage and 500VRMS working voltage per IEC62368-1, with 4.2mm creepage and clearance. The ratiometric analog output scales with VCC (KSENS = 98–102%, KVO = 99–101%), supporting direct ADC interfacing without gain calibration.

Key Specifications

Pinout & Package

SOIC-8 package (5mm × 4mm, 1.27mm pitch) with reinforced creepage/clearance (4.2mm) for high-voltage isolation. Primary current path occupies pins 1–4 (IP+/IP−); signal side occupies pins 5–8 (GND/FILT/VOUT/VCC).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCTR-05AB-T, MCQ1806GS-5-05-AEC1-Z provides 25% higher isolation margin and full automotive qualification; versus TB9052FG, it delivers 10× faster response for analog feedback control but requires external ADC resources.

Availability

MCQ1806GS-5-05-AEC1-Z is available at Aetrix Electronics and suitable for automotive powertrain systems, on-board chargers, and electric power steering requiring stable component supply with AEC-Q100 compliance and 15-year lifecycle assurance.

Supply support for MCQ1806GS-5-05-AEC1-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, with design centers in the US, China, and Taiwan.

The MCQ1806 product line targets automotive current sensing applications demanding high accuracy, galvanic isolation, and AEC-Q100 reliability-specifically engineered for traction inverters, OBCs, and EPS systems where safety and longevity are critical.

FAQ

What is the maximum continuous primary current the MCQ1806GS-5-05-AEC1-Z can measure with guaranteed linearity?

The device maintains ±2.5% total output error across its optimized range of ±5A. Beyond ±5A, output remains proportional but nonlinearity increases; saturation occurs near ±15A depending on thermal conditions. For sustained operation, keep primary current ≤±5A to meet datasheet accuracy specs.

Can the MCQ1806GS-5-05-AEC1-Z operate with a 3.3V supply?

No. This variant is specified exclusively for 4.5V–5.5V operation. The "-5-" in the part number denotes 5V supply optimization. For 3.3V systems, use MCQ1806GS-3-05-AEC1-Z, which has different internal trimming and 264mV/A sensitivity.

How does the FILT pin affect bandwidth and noise performance?

Connecting a capacitor (CF) between FILT and GND forms an RC low-pass filter with internal RFI (1.5kΩ) and CFI (1nF). A 1nF CF yields ~100kHz bandwidth; increasing CF to 10nF reduces bandwidth to ~10kHz, lowering integrated noise from 50mA(RMS) to ~16mA(RMS) at 60kHz.

Is external calibration required for production use?

No. The device is factory-trimmed for sensitivity and offset. At ±5A and 25°C, sensitivity error is ±2%; over –40°C to +125°C, total output error remains within ±2.5%. Single-point zero-current calibration at system level suffices for most automotive applications.

What is the thermal impact of the 0.9mΩ primary conductor at full-scale current?

At ±5A, power dissipation is I²R = 25 × 0.0009 = 22.5mW. With typical SOIC-8 θJA ≈ 120°C/W, this adds <3°C junction rise above ambient-well within the –40°C to +125°C operating range and enabling placement near heat-generating power stages.

Does the MCQ1806GS-5-05-AEC1-Z support bidirectional current measurement in both AC and DC modes?

Yes. The differential Hall architecture and ratiometric VOUT = VCC/2 + SENS × IP enable true bidirectional sensing for AC waveforms (e.g., motor phase currents) and DC levels (e.g., battery charge/discharge) without polarity reversal or external circuitry.

What PCB layout practices ensure optimal magnetic immunity?

Route high-current traces symmetrically between IP+ and IP− pads to minimize net magnetic field; keep signal traces (VOUT, FILT) >5mm from power paths; use ground plane void beneath the IC's Hall sensing region; avoid placing magnets or inductors within 10mm of the package body.