Monolithic Power Systems Inc. MCQ1806GS-5-25-AEC1-Z

Overview

MCQ1806GS-5-25-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 ±25A, featuring 3kVRMS isolation, 500VRMS working voltage, ±2.5% total output error over -40°C to +125°C, and 80 mV/A sensitivity at 5V supply - deployed in automotive motor control and inverter phase-leg monitoring.

For engineers reviewing the MCQ1806GS-5-25-AEC1-Z datasheet, MCQ1806GS-5-25-AEC1-Z pinout, MCQ1806GS-5-25-AEC1-Z application, or MCQ1806GS-5-25-AEC1-Z equivalent, this page delivers verified technical context, SOIC-8 pin mapping, ratiometric analog output behavior, bandwidth tuning via FILT pin, and validated automotive-grade alternatives with explicit accuracy and range trade-offs.

Technical Context

The device 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 (0.9mΩ) carries current directly through IP+/IP− pins, generating asymmetric magnetic fields sensed at two integrated Hall plates (PMCF1 = 0.6 mT/A, PMCF2 = 0.3 mT/A), enabling high-accuracy current-to-voltage conversion.

Isolation is achieved via internal dielectric barrier rated for 3kVRMS withstand and 6kV surge per IEC62368-1, with external creepage/clearance ≥4.2mm. Bandwidth is adjustable up to 100kHz using an external capacitor on the FILT pin, while propagation delay (1.5µs), rising time (4µs), and response time (5µs) support fast fault detection in safety-critical systems.

Key Specifications

Pinout & Package

MCQ1806GS-5-25-AEC1-Z uses a standard SOIC-8 package (5mm × 4mm, 1.27mm pitch) with reinforced creepage/clearance (≥4.2mm) for high-voltage isolation. Primary current path (IP+/IP−) and signal pins (VCC, VOUT, FILT, GND) are physically segregated to maintain galvanic separation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCTR-25AB-T, MCQ1806GS-5-25-AEC1-Z offers AEC-Q100 compliance and bandwidth configurability; versus TLE4971-25U5-S, it provides plug-and-play analog integration at the cost of absolute accuracy - making it optimal for cost-constrained, high-volume automotive analog control loops.

Availability

MCQ1806GS-5-25-AEC1-Z is available at Aetrix Electronics and suitable for automotive motor control, inverter phase-leg monitoring, and onboard charger current sensing requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.

Supply support for MCQ1806GS-5-25-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 core expertise in DC/DC converters, LED drivers, and isolated sensing solutions.

The MCQ1806 product line delivers automotive-qualified, monolithic Hall-effect current sensors targeting high-reliability traction inverters, battery systems, and charging infrastructure - emphasizing galvanic isolation, wide temperature operation, and minimal external component count.

FAQ

What is the maximum continuous primary current the MCQ1806GS-5-25-AEC1-Z can handle without derating?

The device is rated for ±25A optimized accuracy range, but its 0.9mΩ conductor supports continuous currents up to ±50A with increased nonlinearity beyond ±25A. Thermal limits depend on PCB copper area and ambient temperature; at 25A, power dissipation is ~0.56W, requiring ≥2cm² 2oz copper pour for ≤40°C rise in still air.

How does the FILT pin affect noise performance and bandwidth?

Connecting a capacitor (CF) between FILT and GND forms a first-order RC filter with internal RFI (1.5kΩ) and CFI (1nF), setting −3dB bandwidth as fBW ≈ 1/(2π × RFI × CF). For example, 1nF yields ~106kHz; 10nF yields ~10.6kHz. Larger CF reduces high-frequency noise but increases response time - 100nF raises tRESPONSE from 5µs to ~50µs.

Is the output truly ratiometric across the full 4.5–5.5V supply range?

Yes: KSENS (sensitivity ratiometry) and KVO (zero-current output ratiometry) are both specified 98–102% across VCC = 4.5–5.5V, meaning VOUT scales linearly with supply voltage. This ensures consistent full-scale output (e.g., 2V at ±25A) regardless of 5V rail tolerance, eliminating need for supply voltage monitoring in analog signal chains.

Can MCQ1806GS-5-25-AEC1-Z replace optocoupler-based current sensors in existing designs?

Yes - its 3kVRMS isolation, SOIC-8 footprint, and analog output match legacy optocoupler-based solutions (e.g., HCPL-7840), but with superior accuracy (±2.5% vs ±5%), no LED aging, and no external gain resistors. Layout changes are minimal: replace optocoupler with MCQ1806, add 1µF VCC bypass, and route IP+/IP− through primary conductor path.

What is the impact of external magnetic fields on measurement accuracy?

The differential Hall architecture cancels uniform external fields; tested immunity exceeds ±1mT at 50Hz–1MHz. However, localized fields >5mT near IP+ or IP− pins (e.g., from adjacent inductors) cause measurable offset shift. Recommended layout: keep magnetic components ≥8mm away and orient conductors perpendicular to sensitive axis (Z-axis of Hall plates).

Does the device require calibration during production?

No factory calibration is needed: sensitivity, offset, and ratiometry are trimmed at wafer sort. Total output error remains within ±2.5% over −40°C to +125°C without user adjustment. Optional one-point zero-current trim (at system level) can reduce residual offset to <±2mV, improving resolution at low currents.

How is AEC-Q100 Grade 1 qualification verified for this part number?

MCQ1806GS-5-25-AEC1-Z undergoes full AEC-Q100 stress testing including HTOL (1000h at 150°C), TC (1000 cycles −40°C ↔ +125°C), UHAST (96h @ 130°C/85% RH), and ESD (±2kV HBM). Qualification applies to the entire MCQ1806 family; the "-AEC1" suffix confirms Grade 1 (−40°C to +125°C) qualification per Rev. 1.0 datasheet dated Jan 2023.