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

Overview

MCQ1806GS-3-05-AEC1-Z 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, supports ±5A bidirectional primary current range with 264 mV/A sensitivity, and features 3kVRMS isolation voltage and 0.9mΩ internal conductor resistance. Used in motor control feedback loops and inverter phase-leg monitoring where high accuracy and magnetic immunity are critical.

For engineers reviewing the MCQ1806GS-3-05-AEC1-Z datasheet, MCQ1806GS-3-05-AEC1-Z pinout, MCQ1806GS-3-05-AEC1-Z application, or MCQ1806GS-3-05-AEC1-Z equivalent, this page provides verified technical context, SOIC-8 package layout, ratiometric analog output behavior, AEC-Q100 compliance evidence, and real-world design tradeoffs for bandwidth vs. noise in traction inverter subsystems.

Technical Context

The MCQ1806GS-3-05-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 forms part of the signal path, enabling direct current flow with minimal insertion loss (0.9mΩ).

Isolation is achieved via reinforced dielectric barrier between primary pins (IP+, IP−) and secondary signal pins (VCC, VOUT, FILT, GND), rated for 3kVRMS surge and 500VRMS working voltage per IEC62368-1. Bandwidth is adjustable up to 100kHz using an external capacitor on the FILT pin, with propagation delay of 1.5µs and response time of 5µs.

Key Specifications

Pinout & Package

MCQ1806GS-3-05-AEC1-Z uses a standard SOIC-8 (5mm × 4mm) surface-mount package with creepage and clearance ≥4.2 mm between primary and secondary sides. The package supports automated optical inspection and reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLE4971-5U and ACS724LLCTR-05AB-T, the MCQ1806GS-3-05-AEC1-Z offers superior isolation (3kVRMS), tighter total error (±2.5% vs. ±3.5%), and guaranteed AEC-Q100 Grade 1 compliance - making it the preferred choice for automotive traction inverters and OBCs requiring functional safety alignment.

Availability

MCQ1806GS-3-05-AEC1-Z is available at Aetrix Electronics and suitable for automotive traction inverters, on-board chargers, and industrial servo drives requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for MCQ1806GS-3-05-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 precision analog sensors.

The MCQ1806 product line is designed specifically for automotive and industrial isolated current sensing, emphasizing AEC-Q100 compliance, magnetic immunity, and integration of primary conductor + Hall sensor + signal conditioning in a single SOIC-8 package.

FAQ

What is the maximum continuous primary current the MCQ1806GS-3-05-AEC1-Z can measure without saturation?

The device maintains linear output up to ±5A (its optimized accuracy range). Beyond ±5A, VOUT remains proportional but nonlinearity increases beyond ±0.5%. Saturation occurs near ±15A, where VOUT reaches VCC–0.3V (high) or 0.3V (low) - confirmed by electrical characteristics tables and Figure 3 in the datasheet.

How does the FILT pin affect noise performance and bandwidth?

Connecting a capacitor (CF) between FILT and GND sets a first-order RC filter with RFI = 1.5kΩ and CFI = 1nF internal values. A 1nF external CF yields ~100kHz bandwidth and 50mA(RMS) noise; increasing CF to 10nF reduces bandwidth to ~10kHz and noise to <15mA(RMS), per noise density (200µA/√Hz) and bandwidth calculations in Section 5.

Is the MCQ1806GS-3-05-AEC1-Z compatible with 3.3V microcontrollers without level-shifting?

Yes. With VCC = 3.3V, VOUT swings ratiometrically from ~0.3V to ~3.0V (VCC–0.3V), fully compatible with 3.3V-tolerant ADC inputs. The 98–102% ratiometry coefficient (KSENS) ensures output scaling tracks supply variation, eliminating need for external reference or calibration.

Does the device require external calibration for zero-current offset?

No. Factory trimming achieves ±15mV offset voltage (VOE) over –40°C to +125°C, and spinning current cancellation minimizes thermal drift. The datasheet specifies VOE is measured with zero external magnetic field - no user calibration is needed for automotive-grade repeatability.

What is the creepage and clearance distance between primary and secondary sides?

Both creepage and clearance distances are 4.2 mm, validated per IEC62368-1 for reinforced insulation. This meets requirements for basic isolation in 500VRMS working voltage applications and supports PCB layout with minimum 4.2 mm slotting between IP+/IP− and signal pins.

Can the MCQ1806GS-3-05-AEC1-Z replace shunt resistors in high-side current sensing?

Yes - its galvanic isolation eliminates the need for high-side differential amplifiers and level shifters. With 0.9mΩ conductor resistance and ±2.5% accuracy, it provides lower power loss (<15mW at 5A) and better common-mode rejection than typical 1mΩ shunts paired with isolated amplifiers.