Monolithic Power Systems Inc. MCQ1806GS-3-10-AEC1-P

Overview

MCQ1806GS-3-10-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 ±10A, featuring ±2.5% total output error over -40°C to +125°C, 3.3V single-supply operation, 132mV/A sensitivity, and 3kVRMS isolation rating. It replaces optocouplers in high-reliability automotive motor control and inverter current monitoring.

For engineers reviewing the MCQ1806GS-3-10-AEC1-P datasheet, MCQ1806GS-3-10-AEC1-P pinout, MCQ1806GS-3-10-AEC1-P application, or MCQ1806GS-3-10-AEC1-P equivalent, this page delivers verified technical context, SOIC-8 package mapping, ratiometric analog output behavior, isolation compliance (IEC62368-1), and validated automotive-grade performance under thermal stress and magnetic interference.

Technical Context

The MCQ1806GS-3-10-AEC1-P integrates 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 (0.9mΩ) enables low-loss current sensing while maintaining galvanic isolation between power path (IP+/IP−) and signal pins (VOUT, FILT, GND, VCC).

Bandwidth is adjustable up to 100kHz via external capacitor on FILT pin; internal filter (RFI = 1.5kΩ, CFI = 1nF) sets default response. Propagation delay is 1.5µs, rising time 4µs, and power-on time 90µs - optimized for real-time fault detection in traction inverters and OCP circuits.

Key Specifications

Pinout & Package

SOIC-8 (5mm × 4mm) surface-mount package with reinforced creepage/clearance (4.2mm) for reinforced isolation. Primary current path (IP+/IP−) is internally paralleled for low-inductance, low-resistance conduction; signal side is fully isolated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCB-10AU-T, MCQ1806GS-3-10-AEC1-P offers superior thermal robustness and bandwidth tuning; versus TLE4971-25S5-S, it provides simpler analog integration and lower latency, but lacks embedded diagnostics - choice depends on whether system-level safety architecture favors analog simplicity or digital fault visibility.

Availability

MCQ1806GS-3-10-AEC1-P is available at Aetrix Electronics and suitable for automotive traction inverters, onboard chargers, and HVAC motor controllers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MCQ1806GS-3-10-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 focus on efficiency, integration, and reliability for automotive, industrial, and cloud infrastructure markets.

The MCQ1806 product line delivers isolated current sensing solutions targeting ASIL-B compliant electric vehicle subsystems, emphasizing low drift, magnetic immunity, and seamless integration into space-constrained power stages.

FAQ

What is the maximum continuous primary current the MCQ1806GS-3-10-AEC1-P can measure with full accuracy?

The device is optimized for ±10A with ±2.5% total output error across -40°C to +125°C. It remains functional beyond ±10A (up to ±50A per family variants), but nonlinearity increases outside this range. At ±10A, conductor dissipation is 90mW - well within SOIC-8 thermal limits at 125°C ambient.

How does the FILT pin affect bandwidth and noise performance?

Connecting a capacitor (CF) between FILT and GND forms a first-order RC filter with internal RFI (1.5kΩ) and CFI (1nF). With CF = 0 (open), bandwidth is 100kHz. Adding 1nF yields ~110kHz; 10nF reduces it to ~11kHz. Larger CF lowers noise floor but increases response time - e.g., 10nF extends tRESPONSE from 5µs to ~45µs.

Is external calibration required for production use?

No. The device is factory-trimmed for sensitivity and offset; zero-current output (VOUT(Q)) is guaranteed within ±10mV of VCC/2 over temperature. Ratiometric behavior (KSENS/KVO = 98–102%) ensures consistent scaling without per-unit calibration, reducing test time and cost in high-volume automotive manufacturing.

Can the MCQ1806GS-3-10-AEC1-P replace optocoupler-based current sensors?

Yes - its 3kVRMS isolation, 4.2mm creepage/clearance, and IEC62368-1 certification meet or exceed optocoupler safety standards. Unlike optos, it offers superior temperature stability (no LED aging), higher bandwidth (100kHz vs. typically <50kHz), and no current-transfer-ratio (CTR) degradation over lifetime.

What PCB layout practices ensure optimal magnetic immunity?

Route IP+ and IP− traces symmetrically and tightly coupled (differential pair) to cancel common-mode magnetic fields. Keep signal traces (VOUT, FILT, GND) away from high-di/dt paths. Use solid ground plane beneath signal side; avoid routing noisy signals (e.g., gate drivers) under the SOIC-8 body. Maintain ≥5mm clearance from transformers or inductors.

Does the device support bidirectional current measurement out-of-the-box?

Yes - VOUT is centered at VCC/2 (1.65V at 3.3V supply), producing positive voltage for current in IP+→IP− direction and negative deviation for reverse flow. No external biasing or op-amp circuitry is needed; the full ±10A range maps linearly to ~0.33V–2.97V output swing.

What is the impact of supply voltage variation on measurement accuracy?

VOUT is ratiometric: both sensitivity (SENS) and zero-current output (VOUT(Q)) scale with VCC. KSENS (98–102%) and KVO (99–101%) guarantee that accuracy remains stable across VCC = 3.0–3.6V - critical during automotive cold-crank (2.8V) or load-dump (4.5V) events where unregulated rails fluctuate.