Monolithic Power Systems Inc. MCQ1806GS-3-05-AEC1-P

Overview

MCQ1806GS-3-05-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, galvanically isolated Hall-effect current sensor for automotive and industrial DC/AC current sensing. It delivers ±2.5% total output error over -40°C to +125°C, features 3kVRMS isolation, 500VRMS working voltage, ±5A bidirectional range, and 264 mV/A sensitivity with 3.3V supply.

For engineers reviewing the MCQ1806GS-3-05-AEC1-P datasheet, MCQ1806GS-3-05-AEC1-P pinout, MCQ1806GS-3-05-AEC1-P application, or MCQ1806GS-3-05-AEC1-P equivalent, this page provides verified technical context, SOIC-8 package layout, ratiometric analog output behavior, isolation compliance (IEC62368-1), and automotive-grade reliability data - all confirmed from MPS Rev. 1.0 documentation.

Technical Context

The MCQ1806GS-3-05-AEC1-P implements a differential Hall array with spinning current offset cancellation to reject stray magnetic fields and achieve stable zero-current output (VOUT(Q) = VCC/2). Its primary conductor (0.9 mΩ) carries current directly through the package, generating opposing magnetic fields at two integrated Hall transducers (PMCF1 = 0.6 mT/A, PMCF2 = 0.3 mT/A), whose difference is converted to a proportional analog voltage.

Isolation is achieved via reinforced dielectric barrier between primary pins (IP+, IP−) and signal pins (VCC, VOUT, FILT, GND), certified to 3kVRMS withstand and 500VRMS working voltage per IEC62368-1. Bandwidth is adjustable up to 100 kHz using an external capacitor on FILT, while ratiometric scaling (KSENS = 98–102%, KVO = 99–101%) ensures output stability across VCC variation (3.0–3.6V).

Key Specifications

Pinout & Package

MCQ1806GS-3-05-AEC1-P uses a standard SOIC-8 (5mm × 4mm) package with creepage/clearance ≥4.2 mm between primary and secondary sides, optimized for PCB space-constrained automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCTR-05AB-T and TLE4971-5U, the MCQ1806GS-3-05-AEC1-P uniquely combines AEC-Q100 Grade 1, 3.3V-only operation, adjustable bandwidth, and SOIC-8 size - making it optimal for space- and qualification-constrained 48V hybrid subsystems where supply rail simplicity matters.

Availability

MCQ1806GS-3-05-AEC1-P is available at Aetrix Electronics and suitable for electric power steering, on-board chargers, 48V mild hybrid disconnect switches, and traction inverter phase monitoring requiring stable component supply across automotive production lifecycles.

Supply support for MCQ1806GS-3-05-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MCQ1806 series belongs to MPS's automotive-qualified isolated current sensor product line, engineered specifically for high-reliability, low-loss current measurement in electrified vehicle subsystems including EPS, OBC, and battery management.

FAQ

What is the maximum continuous primary current the MCQ1806GS-3-05-AEC1-P can measure with guaranteed accuracy?

The device is specified for ±5A with ±2.5% total output error across -40°C to +125°C. While it remains functional beyond ±5A (up to ±50A), nonlinearity increases outside this range, and accuracy degrades beyond the ±2.5% specification. For reliable closed-loop control, operate strictly within ±5A.

Does the MCQ1806GS-3-05-AEC1-P require external calibration for automotive production?

No. The device is factory-trimmed for sensitivity and offset, delivering ±2.5% total output error without system-level calibration. Lifetime drift is limited to ±1% for both sensitivity and total error, satisfying AEC-Q100 long-term stability requirements for automotive ECUs.

How does the FILT pin affect noise performance and response time?

Connecting a capacitor (CF) between FILT and GND sets the 3dB bandwidth: 1 nF yields ~100 kHz, while 10 nF reduces it to ~10 kHz. Lower bandwidth reduces input-referred noise (e.g., 50 mA RMS at 60 kHz) but increases response time - tRESPONSE rises from 5 µs (no CF) to ~50 µs (10 nF), impacting fault detection speed.

Can the MCQ1806GS-3-05-AEC1-P be used in bidirectional DC applications like regenerative braking?

Yes. Its linear, ratiometric output (VOUT = VCC/2 ± SENS × IP) is inherently bidirectional and supports both motoring and regenerative current flow. The ±5A range and 0.9 mΩ conductor enable accurate energy recovery measurement in 48V mild hybrid brake-by-wire systems.

What is the minimum creepage distance, and how does it impact PCB layout?

The package guarantees ≥4.2 mm external creepage and clearance between primary (IP+, IP−) and secondary (VCC, VOUT, FILT, GND) pins. This mandates ≥4.2 mm slotting or isolation barrier in PCB layout - critical for passing IEC62368-1 basic insulation testing in automotive 48V systems.

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 = 3.0–3.6V. This means both sensitivity and zero-current output scale linearly with supply voltage, ensuring consistent ADC codes despite LDO ripple or battery sag in automotive 3.3V domains.

What failure modes are covered under AEC-Q100 Grade 1 qualification?

AEC-Q100 Grade 1 certification covers stress tests including HTOL (1000 hrs at 125°C), TC (1000 cycles -40°C to +125°C), UHAST (96 hrs), and ESD (±2kV HBM). These validate robustness against thermal cycling, moisture ingress, and electrostatic discharge - essential for under-hood EPS and OBC deployments.