Monolithic Power Systems Inc. MCQ1806GS-5-20-AEC1-Z

Overview

MCQ1806GS-5-20-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 ±20A, featuring ±2.5% total output error, 3kVRMS isolation voltage, 500VRMS working voltage, and 100mV/A sensitivity at 5V supply. It operates in automotive motor control and inverter systems where high accuracy, magnetic immunity, and compact SOIC-8 packaging are critical.

For engineers reviewing the MCQ1806GS-5-20-AEC1-Z datasheet, MCQ1806GS-5-20-AEC1-Z pinout, MCQ1806GS-5-20-AEC1-Z application in traction inverters or battery management, or MCQ1806GS-5-20-AEC1-Z equivalent for AEC-Q100-compliant current sensing, this page delivers verified technical context, package mapping, real-world application cards, and validated alternatives with functional distinctions.

Technical Context

The MCQ1806GS-5-20-AEC1-Z 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, high-fidelity current sampling without external shunts.

Galvanic isolation between IP+/IP− and signal pins (VCC/VOUT/FILT/GND) meets IEC62368-1 basic insulation requirements (3000VRMS withstand, 500VRMS working), enabling direct replacement of optocoupler-based current monitors in high-voltage automotive subsystems.

Key Specifications

Pinout & Package

MCQ1806GS-5-20-AEC1-Z uses a standard SOIC-8 (5mm × 4mm) package with creepage/clearance ≥4.2mm, optimized for automated assembly and high-voltage board spacing compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCTR-20AB-T, MCQ1806GS-5-20-AEC1-Z delivers certified automotive reliability and higher isolation; versus TLE4971-20S4-10-1-50, it offers smaller footprint and integrated supply regulation at minor accuracy trade-off-ideal for space-limited EPS and OBC modules.

Availability

MCQ1806GS-5-20-AEC1-Z is available at Aetrix Electronics and suitable for automotive motor control, traction inverter current sensing, and battery management systems requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.

Supply support for MCQ1806GS-5-20-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 focus on efficiency, integration, and reliability for automotive, industrial, and computing markets.

The MCQ1806 product line targets AEC-Q100-compliant isolated current sensing in electric vehicle powertrain subsystems, emphasizing low conductor resistance, magnetic immunity, and SOIC-8 manufacturability for high-volume automotive assembly.

FAQ

What is the maximum continuous primary current the MCQ1806GS-5-20-AEC1-Z can measure without saturation?

The device maintains linear output up to ±20A (its optimized accuracy range), with saturation voltages of VCC − 0.5V (high) and 0.5V (low) at 5V supply. Beyond ±20A, output remains proportional but nonlinearity exceeds ±2.5%; maximum survivable surge current is 3000A per IEC61000-4-5.

How does the FILT pin affect bandwidth and noise performance?

Connecting a capacitor (CF) between FILT and GND forms an RC filter with internal RFI (1.5kΩ) and CFI (1nF), setting the 3dB bandwidth. For example, 1nF yields ~100kHz; 10nF reduces bandwidth to ~10kHz, lowering output noise by √10 while increasing response time proportionally.

Is external calibration required for production use?

No. The device is factory-trimmed for sensitivity and offset, achieving ±2.5% total output error across −40°C to +125°C without system-level calibration. Zero-current output is guaranteed within ±10mV of VCC/2 at 25°C, and ratiometric tracking (KSENS/KVO ≥98%) eliminates supply-voltage dependency.

Can MCQ1806GS-5-20-AEC1-Z replace shunt resistors in high-side current sensing?

Yes - its galvanic isolation, 0.9mΩ conductor resistance, and bidirectional capability make it a drop-in alternative to high-side shunt + isolated amplifier solutions. It avoids shunt power loss (e.g., 360mW at 20A vs. >1W for typical 2.5mΩ shunts) and eliminates level-shifting complexity.

What PCB layout practices ensure optimal magnetic immunity?

Route IP+ and IP− traces symmetrically and tightly coupled (minimum loop area) to cancel common-mode magnetic fields. Keep signal traces (VOUT, FILT, GND) >5mm from high-di/dt nodes. Use solid ground plane beneath SOIC-8 footprint, and avoid placing ferrite beads or inductors within 10mm of the package body.

Does the device support both unidirectional and bidirectional current measurement?

Yes - the differential Hall architecture and ratiometric output centered at VCC/2 enable true bidirectional sensing from −20A to +20A. Unidirectional use is supported by biasing the output range (e.g., 0.5V–4.5V) via external circuitry, though native operation is symmetric about zero.

What is the thermal derating behavior above 125°C ambient?

Junction temperature must not exceed 165°C. At ambient >125°C, derating depends on PCB copper area and airflow; with 2oz copper and 1cm² thermal pad, power dissipation (10.5mA × 5V ≈ 52.5mW) allows ~10°C additional ambient before reaching TJ(max), assuming θJA ≈ 100°C/W.