Monolithic Power Systems Inc. MCS1802GS-05-Z

Overview

MCS1802GS-05-Z from Monolithic Power Systems is a galvanically isolated, linear Hall-effect current sensor optimized for ±5A bidirectional DC/AC sensing with 264 mV/A sensitivity, ±2.5% total output error over -40°C to +125°C, and 2.2kVRMS isolation voltage. It integrates differential Hall sensing, spinning-current offset cancellation, and ratiometric analog output for high-accuracy motor control and power supply monitoring.

For engineers reviewing the MCS1802GS-05-Z datasheet, MCS1802GS-05-Z pinout, MCS1802GS-05-Z application, or MCS1802GS-05-Z equivalent, this page delivers verified specifications including SOIC-8 package mapping, primary conductor resistance (0.9 mΩ), 4 µs output rise time, adjustable bandwidth up to 100 kHz, and isolation compliance per IEC62368-1 - all confirmed against MPS Rev. 1.1 documentation.

Technical Context

The MCS1802GS-05-Z implements a differential Hall array with two magnetically coupled transducers (PMCF1 = 0.6 mT/A, PMCF2 = 0.3 mT/A) to reject stray fields and eliminate hysteresis. Its internal 0.9 mΩ primary conductor enables low-loss current sampling while maintaining 4.2 mm creepage/clearance.

Signal conditioning includes factory-trimmed sensitivity, dynamic offset cancellation, and an internal RC filter (RFi = 1.5 kΩ, CFi = 1 nF) that supports external bandwidth tuning via FILT pin capacitor. Output is ratiometric (KSENS = 98–102%, KV0 = 99–101%) and referenced to VCC/2 at zero current.

Key Specifications

Pinout & Package

SOIC-8 package (5 mm × 4 mm, 1.27 mm pitch) with reinforced creepage and clearance (4.2 mm) for reinforced isolation. Primary current path (IP+, IP−) is internally shorted per side and electrically isolated from signal pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS712ELCTR-05B-T and TLE4971-5U, the MCS1802GS-05-Z offers superior thermal stability (±2.5% error to +125°C), faster response (4 µs rise), and flexible bandwidth control - making it optimal for high-reliability industrial motor drives and compact power supplies where size and precision are critical.

Availability

MCS1802GS-05-Z is available at Aetrix Electronics and suitable for motor control, switch-mode power supplies, and over-current fault protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MCS1802GS-05-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, including DC/DC converters, LED drivers, and precision analog sensors.

The MCS1802 product line delivers isolated current sensing solutions targeting space-constrained, high-efficiency applications such as motor drives, EV charging, and industrial power supplies - emphasizing accuracy, reliability, and integration.

FAQ

What is the minimum recommended bypass capacitor for VCC?

A 1 µF low-ESR ceramic capacitor must be placed as close as possible to the VCC pin (Pin 8) to suppress high-frequency noise and ensure stable internal regulator operation. This value is specified in the Absolute Maximum Ratings section and validated across -40°C to +125°C operation.

Can the MCS1802GS-05-Z measure AC current waveforms accurately?

Yes - its linear Hall architecture supports true RMS-capable AC current measurement up to 100 kHz bandwidth. The ratiometric output and ±2.5% total error specification apply equally to sinusoidal, square, and arbitrary waveforms within the ±5 A range and operating temperature limits.

How does the FILT pin affect bandwidth and noise performance?

Connecting a capacitor (CF) between FILT (Pin 6) and GND (Pin 5) forms a first-order low-pass filter with internal RFi (1.5 kΩ) and CFi (1 nF). Increasing CF reduces bandwidth and input-referred noise - e.g., 1 nF yields ~100 kHz, while 10 nF lowers it to ~10 kHz and cuts 60 kHz noise from 50 mARMS to ~16 mARMS.

Is the primary conductor rated for continuous 5 A current?

Yes - the 0.9 mΩ internal conductor supports continuous ±5 A with <225 µW conduction loss at 25°C. Thermal derating applies above +85°C ambient; maximum junction temperature remains 165°C per Absolute Maximum Ratings, allowing sustained operation under typical PCB copper pour conditions.

Does the device require calibration after soldering?

No - factory trimming of sensitivity and offset, combined with spinning-current cancellation, ensures ±2.5% total output error without post-solder calibration. Layout-dependent thermal gradients may introduce <±0.3% additional error, mitigated by symmetric copper pours around IP+ and IP− traces.

What safety certifications does the isolation barrier meet?

The isolation barrier is type-tested per IEC62368-1 for 2.2 kVRMS withstand voltage (60 s) and 6 kV surge (IEC61000-4-5), with 100% production testing. External creepage and clearance are 4.2 mm - satisfying reinforced insulation requirements for functional safety up to 350 VPK working voltage.

How is zero-current output voltage (VOUT(Q)) defined and trimmed?

VOUT(Q) is defined as the output voltage at IP = 0 A and is trimmed to VCC/2 ±15 mV over temperature. This is achieved via laser trimming of internal offset compensation circuitry during final test, ensuring ratiometric behavior (KV0 = 99–101%) across the 3.0–3.6 V supply range.