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

Overview

MCQ1806GS-5-25-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 80mV/A sensitivity at 5V supply. It replaces optocouplers in high-reliability automotive motor control and inverter phase-leg monitoring.

For engineers reviewing the MCQ1806GS-5-25-AEC1-P datasheet, MCQ1806GS-5-25-AEC1-P pinout, MCQ1806GS-5-25-AEC1-P application, or MCQ1806GS-5-25-AEC1-P equivalent, this page delivers verified isolation specs, SOIC-8 terminal mapping, bandwidth tuning via FILT pin, ratiometric analog output behavior, and automotive-grade lifetime drift data (±1% total error drift).

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 internal 0.9mΩ primary conductor enables low-loss current sensing while maintaining 4.2mm creepage/clearance for reinforced isolation compliance per IEC62368-1.

Signal conditioning includes factory-trimmed sensitivity, ratiometric gain (KSENS = 98–102%), and adjustable bandwidth (up to 100kHz) via external capacitor on FILT pin. Propagation delay is 1.5µs and response time is 5µs, supporting fast overcurrent detection in traction inverters and DC-DC controllers.

Key Specifications

Pinout & Package

MCQ1806GS-5-25-AEC1-P uses a standard SOIC-8 package (5mm × 4mm, 1.27mm pitch) with reinforced creepage and clearance (4.2mm) between primary and secondary sides. Primary current path is internally bonded across dual pins for low inductance and high surge capability (3000A surge test).

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 and TLE4971-25S4, MCQ1806GS-5-25-AEC1-P uniquely combines AEC-Q100 Grade 1, 3kVRMS isolation, SOIC-8 form factor, and FILT-adjustable bandwidth - making it the only option qualified for under-hood inverter current sensing without external signal conditioning.

Availability

MCQ1806GS-5-25-AEC1-P is available at Aetrix Electronics and suitable for automotive motor control, onboard charger protection, and battery management systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MCQ1806GS-5-25-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 sensing product line, engineered specifically for high-accuracy, high-isolation current monitoring in electric vehicle powertrain and charging systems.

FAQ

What is the maximum continuous primary current the MCQ1806GS-5-25-AEC1-P can measure with guaranteed linearity?

The device maintains ±2.5% total output error across its optimized accuracy range of ±25A at 5V supply. Beyond ±25A, output remains proportional but nonlinearity increases; saturation occurs near ±60A based on 5V supply headroom and internal gain limits. For sustained operation, thermal limits require keeping junction temperature below 125°C, which constrains average current in high-ambient environments.

How does the FILT pin affect bandwidth and noise performance?

Connecting a capacitor (CF) between FILT and GND sets a first-order RC filter with internal RFI = 1.5kΩ and CFI = 1nF. A 1nF CF yields ~100kHz bandwidth; increasing CF reduces bandwidth and input-referred noise (e.g., 10nF → ~10kHz, IN ≈ 16mA RMS). FILT may be left floating for maximum bandwidth, but external filtering is then required for noisy environments.

Is the MCQ1806GS-5-25-AEC1-P compatible with 3.3V microcontrollers despite its 5V supply requirement?

Yes - its ratiometric output (VOUT = VCC/2 ± SENS × IP) produces a 2.0V full-scale swing at ±25A with 5V supply, well within the input range of most 3.3V ADCs. The 5V VCC is internally regulated and independent of MCU I/O voltage; no level-shifting is needed for analog readout, though digital control lines (if present) would require translation.

Does the device require external zero-current calibration during system startup?

No - spinning current offset cancellation and factory trimming ensure zero-current output (VOUT(Q)) stays within ±10mV of VCC/2 over -40°C to +125°C. This eliminates the need for system-level null calibration, reducing firmware complexity and startup time. Lifetime drift is specified at ±1%, validated over 1000 hours HTOL testing.

What is the significance of the dual IP+ and dual IP- pins in the SOIC-8 layout?

The duplicated IP+ (pins 1&2) and IP- (pins 3&4) terminals reduce effective lead inductance and resistance by paralleling bond wires and PCB traces. This preserves signal fidelity at high di/dt (e.g., >100A/µs in IGBT switching), minimizes self-heating (0.9mΩ total), and supports 3000A surge current per IEC61000-4-5 - critical for automotive fault tolerance.

Can the MCQ1806GS-5-25-AEC1-P be used in non-automotive industrial applications?

Yes - its 3kVRMS isolation, 500VRMS working voltage, and -40°C to +125°C operation meet IEC62368-1 and UL62368-1 standards for industrial equipment. While AEC-Q100 qualification targets automotive, the underlying reliability testing (HTOL, ESD, temperature cycling) exceeds typical industrial requirements, making it suitable for solar inverters, UPS systems, and servo drives.

How is the 0.9mΩ primary conductor resistance measured and why does it matter?

RP is defined as the total resistance between solder joint and internal conductor point, measured with both IP+ pins (and both IP- pins) at equal potential - matching actual PCB layout conditions. At 25A, this yields only 562.5µW conduction loss, enabling compact thermal design and minimizing voltage drop in high-current paths, especially critical in space-constrained inverter modules.