Monolithic Power Systems Inc. MCS1802GS-30-Z

Overview

MCS1802GS-30-Z from Monolithic Power Systems is a galvanically isolated, linear Hall-effect current sensor optimized for ±30A bidirectional DC/AC sensing with 44 mV/A sensitivity and ±2.5% total output error over -40°C to +125°C. It features differential Hall sensing, 0.9 mΩ internal conductor resistance, and SOIC-8 packaging-enabling high-accuracy motor phase current monitoring in industrial inverters.

For engineers reviewing the MCS1802GS-30-Z datasheet, MCS1802GS-30-Z pinout, MCS1802GS-30-Z application, or MCS1802GS-30-Z equivalent, key selection criteria include its 2.2kVRMS isolation rating, ratiometric 3.3V output scaling, adjustable bandwidth up to 100kHz via external FILT capacitor, and factory-trimmed offset stability across temperature.

Technical Context

The MCS1802GS-30-Z implements a differential Hall array with spinning current offset cancellation, eliminating drift from thermal gradients and stray magnetic fields. Its primary conductor path (IP+/IP−) is physically separated from signal pins (VCC, VOUT, FILT, GND), enabling reinforced galvanic isolation per IEC62368-1.

Signal conditioning includes an internal 1.5kΩ filter resistor and 1nF capacitor, allowing bandwidth tuning from <10kHz to 100kHz using an external CF capacitor on FILT. Output voltage is ratiometric to VCC (3.0–3.6V), with zero-current output fixed at VCC/2 and propagation delay of 1.5µs.

Key Specifications

Pinout & Package

SOIC-8 package (5mm × 4mm, 1.27mm pitch) with creepage/clearance ≥4.2mm between primary (IP+/IP−) and signal (VCC/VOUT/FILT/GND) sides.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCTR-30AB-T and TLE4971-25S4-10-1-5-SP, the MCS1802GS-30-Z offers tighter ±2.5% error over temperature without diagnostics overhead, lower power consumption, and SOIC-8 footprint compatibility with legacy PCB layouts.

Availability

MCS1802GS-30-Z is available at Aetrix Electronics and suitable for motor control, switch-mode power supplies, and over-current fault protection requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MCS1802GS-30-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 for industrial motor drives and power conversion, emphasizing accuracy, thermal stability, and integration to replace discrete isolation + shunt solutions.

FAQ

What is the maximum continuous primary current the MCS1802GS-30-Z can handle without derating?

The device is rated for ±30A continuous primary current with guaranteed ±2.5% total output error across -40°C to +125°C junction temperature. At 30A, power dissipation is 0.81W (I²×R = 30²×0.0009). With SOIC-8 θJA ≈ 100°C/W, junction rise is ~81°C above ambient-well within 165°C absolute max if ambient stays ≤44°C. Forced air or copper pour reduces thermal resistance.

How does the FILT pin affect bandwidth and noise performance?

Connecting a capacitor (CF) between FILT and GND forms a first-order RC filter with internal 1.5kΩ resistor and 1nF capacitor. A 1nF CF yields ~100kHz bandwidth; 10nF reduces it to ~10kHz. Lower bandwidth attenuates high-frequency noise (e.g., PWM switching artifacts) but increases response time-critical for fault detection timing budgets.

Can the MCS1802GS-30-Z measure AC current waveforms accurately?

Yes. The device responds linearly to both DC and AC currents up to 100kHz bandwidth. At 50/60Hz, total error remains ±2.5% across temperature. For distorted waveforms (e.g., 6-pulse rectifier outputs), harmonic content up to 5kHz is preserved with <0.5% nonlinearity, enabling true-RMS calculation in host MCU.

What is the significance of the ratiometric output specification?

Ratiometry means both sensitivity (mV/A) and zero-current output (VCC/2) scale proportionally with VCC. If VCC sags from 3.3V to 3.1V, VOUT at 0A drops from 1.65V to 1.55V, and sensitivity scales from 44 to 41.5 mV/A. This preserves measurement accuracy when powered from an unregulated or shared 3.3V rail, eliminating need for precision voltage references.

Does the MCS1802GS-30-Z require external calibration for production use?

No. Factory trimming ensures ±2.5% total output error over temperature and lifetime without user calibration. Offset voltage drift is limited to ±10mV (-40°C to +125°C), and sensitivity error drift is ±1% over 10 years. System-level calibration is optional only for sub-1% accuracy requirements.

How is galvanic isolation verified in production?

Every unit undergoes 100% production testing per IEC62368-1 for 2.2kVRMS withstand isolation voltage at 60 seconds. Dielectric surge strength is validated at 6kV (1.2/50µs waveform) during qualification. External creepage and clearance distances (4.2mm) are measured on sample units per IPC-A-610.

What layout guidelines ensure optimal magnetic immunity?

Place the device with IP+/IP− traces centered under the package body and avoid routing high-current traces near VCC/VOUT. Maintain ≥5mm distance from transformers, inductors, or bus bars. Use ground plane voids beneath IP+ and IP− pads to prevent eddy currents. Do not place decoupling capacitors or vias within 3mm of the primary conductor path.