Monolithic Power Systems Inc. MCQ1806GS-3-25-AEC1-P

Overview

MCQ1806GS-3-25-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 ±25A, featuring 3kVRMS isolation, 500VRMS working voltage, ±2.5% total output error over temperature, and 52.8 mV/A sensitivity at 3.3V supply - deployed in automotive motor control and inverter phase-leg monitoring.

For engineers reviewing the MCQ1806GS-3-25-AEC1-P datasheet, MCQ1806GS-3-25-AEC1-P pinout, MCQ1806GS-3-25-AEC1-P application, or MCQ1806GS-3-25-AEC1-P equivalent, this page delivers verified technical context, SOIC-8 pin mapping, ratiometric analog output behavior, differential magnetic field immunity, and validated automotive-grade alternatives with explicit accuracy and bandwidth tradeoffs.

Technical Context

The MCQ1806GS-3-25-AEC1-P integrates a differential Hall array with spinning current offset cancellation to reject stray magnetic fields and achieve ±2.5% total output error across –40°C to +125°C. Its primary conductor (0.9mΩ) enables low-loss current sensing while maintaining 4.2mm creepage/clearance for reinforced isolation.

It operates from a single 3.3V supply (3.0–3.6V), delivers ratiometric analog output (VOUT = VCC/2 ± SENS × IP), supports adjustable bandwidth up to 100kHz via external FILT capacitor, and features factory-trimmed sensitivity with <±1% lifetime drift - all within an SOIC-8 package compliant with AEC-Q100 Grade 1 reliability requirements.

Key Specifications

Pinout & Package

MCQ1806GS-3-25-AEC1-P uses a standard SOIC-8 (5mm × 4mm) package with reinforced creepage/clearance (4.2mm) and internal primary conductor routing. Pins 1–4 form the isolated current path; pins 5–8 serve signal/power functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCTR-25AB-T, MCQ1806GS-3-25-AEC1-P provides certified automotive reliability and higher isolation; versus TLE4971-25S4, it trades minor accuracy for lower power, smaller footprint, and tighter cost - making it optimal for volume production in 400V traction inverters and OBCs.

Availability

MCQ1806GS-3-25-AEC1-P is available at Aetrix Electronics and suitable for automotive traction inverters, on-board chargers, electric power steering systems, and high-voltage battery management requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.

Supply support for MCQ1806GS-3-25-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-accuracy, high-isolation, space-constrained current sensing in electric vehicle powertrain and charging systems.

FAQ

What is the maximum continuous primary current the MCQ1806GS-3-25-AEC1-P can measure without exceeding its specified accuracy?

The device maintains ±2.5% total output error across its optimized range of ±25A at temperatures from –40°C to +125°C. Beyond ±25A, output remains proportional but nonlinearity increases; saturation occurs near ±60A depending on thermal conditions and VCC. For guaranteed accuracy, operate strictly within ±25A.

How does the FILT pin affect bandwidth and noise performance?

The FILT pin sets bandwidth by connecting an external capacitor (CF) to GND. With CF = 0 (floating), bandwidth is 100kHz; adding 1nF reduces it to ~100kHz, 10nF to ~10kHz. Larger CF lowers noise but increases propagation delay - e.g., 100nF yields ~1kHz BW and ~100µs tPO, suitable for slow OCP detection.

Can the MCQ1806GS-3-25-AEC1-P be used with a 5V supply?

No - this variant is specified only for 3.3V operation (3.0–3.6V). Using 5V violates absolute maximum ratings and risks permanent damage. For 5V systems, select MCQ1806GS-5-25-AEC1, which has 80 mV/A sensitivity and matching AEC-Q100 qualification but different supply and output scaling.

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

At ±25A, power dissipation is IP² × RP = 625A² × 0.0009Ω = 0.5625W. In a typical SOIC-8 mounted on 2oz copper with 2cm² thermal pad, this yields ~35°C rise above ambient - well within the 125°C max junction limit when ambient is ≤90°C, enabling use in sealed motor control enclosures.

Does the MCQ1806GS-3-25-AEC1-P require external calibration for production systems?

No - it is factory-trimmed for sensitivity and zero-current offset, delivering ±2.5% total error without system-level calibration. However, for applications demanding <±1% error, one-point gain/offset calibration at room temperature and end-of-line thermal soak testing are recommended to compensate for board-level thermal gradients.

How is galvanic isolation verified during production testing?

Every unit undergoes 100% production dielectric withstand testing at 3000 VRMS for 60 seconds per IEC62368-1, plus surge testing per IEC61000-4-5 (±5 pulses, 6kV). Clearance and creepage (4.2mm) are validated via automated optical inspection and mold compound CT scanning to ensure isolation barrier integrity.

What PCB layout practices maximize magnetic immunity in high-noise environments?

Place the MCQ1806GS-3-25-AEC1-P away from transformers, inductors, and high-dI/dt traces; orient its IP+ and IP− leads perpendicular to external field sources; use symmetric ground planes beneath signal pins; and avoid routing noisy digital traces near FILT or VOUT. The differential Hall architecture inherently rejects uniform fields, but localized gradients require physical separation.