Monolithic Power Systems Inc. MCQ1806GS-5-05-AEC1-P

Overview

MCQ1806GS-5-05-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 ±5A, featuring ±2.5% total output error over -40°C to +125°C, 400 mV/A sensitivity at 5V supply, and 3kVRMS isolation rating. It replaces optocouplers in high-reliability automotive motor control and inverter current monitoring.

For engineers reviewing the MCQ1806GS-5-05-AEC1-P datasheet, MCQ1806GS-5-05-AEC1-P pinout, MCQ1806GS-5-05-AEC1-P application, or MCQ1806GS-5-05-AEC1-P equivalent, this page delivers verified specifications, SOIC-8 terminal mapping, automotive-grade isolation performance, bandwidth tuning via FILT pin, and real-world use context for traction inverters, battery management, and OCP circuits.

Technical Context

The device 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 4.2mm creepage/clearance for reinforced isolation.

Internal signal conditioning includes factory-trimmed sensitivity, ratiometric output scaling (KSENS = 98–102%, KVO = 99–101%), and adjustable bandwidth (up to 100kHz) via external capacitor on FILT pin-enabling noise-performance tradeoffs without redesigning the analog front-end.

Key Specifications

Pinout & Package

Package: SOIC-8 (5mm × 4mm, 1.27mm pitch), surface-mount, RoHS-compliant, AEC-Q100 Grade 1 qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCTR-05AB-T and TLE4971-5U, the MCQ1806GS-5-05-AEC1-P uniquely balances automotive-grade isolation, analog simplicity, and tunable bandwidth-making it optimal for hardware-triggered protection and FOC loops where latency, supply flexibility, and safety certification are non-negotiable.

Availability

MCQ1806GS-5-05-AEC1-P is available at Aetrix Electronics and suitable for automotive motor control, battery management systems, and onboard charger designs requiring stable component supply, long-term lifecycle support, and AEC-Q100 traceability.

Supply support for MCQ1806GS-5-05-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 product line targets automotive electrification applications-specifically isolated current sensing in traction inverters, battery disconnect units, and charging systems-where galvanic isolation, AEC-Q100 compliance, and minimal external components are critical.

FAQ

What is the maximum continuous primary current the MCQ1806GS-5-05-AEC1-P can measure with guaranteed linearity?

The device is optimized for ±5A with ±2.5% total output error across -40°C to +125°C. It supports currents beyond ±5A (up to ±50A) but exhibits increased nonlinearity outside the specified range-verified by ELIN ≤0.5% within ±5A and rising to ~2.5% at ±50A per datasheet Figure 3 and Table on page 8.

How does the FILT pin affect noise and bandwidth in practical PCB layout?

Connecting a capacitor (CF) between FILT and GND sets the 3dB bandwidth: 1nF yields ~100kHz, 10nF yields ~10kHz. Layout best practice requires CF to be a 0603 X7R ceramic placed ≤3mm from FILT/GND pins; longer traces introduce parasitic inductance that degrades high-frequency rejection.

Is the MCQ1806GS-5-05-AEC1-P compatible with both 3.3V and 5V microcontrollers?

No-it is a 5V-supply-only variant (VCC = 4.5–5.5V). Its VOUT is ratiometric to VCC, producing 0–5V output. For 3.3V MCU ADCs, a resistor divider or level-shifter is required; the 3.3V-supply variants (e.g., MCQ1806GS-3-05-AEC1) are recommended instead.

Does the device require calibration after soldering or during system operation?

No factory calibration is needed post-assembly. The device features laser-trimmed sensitivity and offset, with ±1% lifetime drift (ESENS(D)/ETOT(D)) and built-in spinning current offset cancellation-ensuring stable zero-current output (VOUT(Q) = VCC/2 ±15mV) across temperature and time without software compensation.

What is the minimum creepage distance, and how does it impact PCB design for 400V systems?

The package provides 4.2mm external creepage and clearance between primary (IP+/IP-) and secondary (VCC/VOUT/FILT/GND) pins. For 400V working voltage, IPC-2221B requires ≥3.2mm-so the MCQ1806GS-5-05-AEC1-P meets reinforced insulation requirements without slotting or spacing adjustments on standard FR-4 boards.

Can the MCQ1806GS-5-05-AEC1-P replace shunt-based sensing in high-side configurations?

Yes-its galvanic isolation allows direct high-side current measurement without level-shifting circuitry. Unlike shunts, it avoids common-mode voltage limitations and power loss (0.9mΩ vs. typical 1–5mΩ shunts), making it superior for 400V+ systems where shunt amplifier CMRR and heat dissipation become problematic.

What failure modes are covered under AEC-Q100 Grade 1 qualification?

AEC-Q100 Grade 1 validates operation from -40°C to +125°C ambient, including accelerated stress tests: 1000h HTOL at 150°C, 1000 cycles temperature cycling (-40°C ↔ +125°C), and 1000h UHAST at 130°C/85% RH-ensuring reliability for under-hood automotive applications with no latent infant mortality failures.