Monolithic Power Systems Inc. MCS1803GS-10-P

Overview

MCS1803GS-10-P from Monolithic Power Systems is a galvanically isolated, linear Hall-effect current sensor optimized for ±10A primary current sensing with 200 mV/A sensitivity, ±2.5% total output error over –40°C to +125°C, and 2.2kVRMS isolation voltage. It operates from a 5V single supply, features differential Hall sensing for stray-field immunity, and replaces optocouplers in motor control and power supply monitoring.

For engineers reviewing the MCS1803GS-10-P datasheet, MCS1803GS-10-P pinout, MCS1803GS-10-P application, or MCS1803GS-10-P equivalent, key selection criteria include its ratiometric analog output, 4 µs rise time, SOIC-8 footprint with integrated 0.9 mΩ conductor, and factory-trimmed accuracy across automotive and industrial temperature ranges.

Technical Context

The device implements a differential Hall array with spinning current offset cancellation to suppress thermal drift and external magnetic interference. Its functional block integrates a POR-regulated 5V supply, dynamic offset compensation, and internal filter components (1.5 kΩ resistance, 1 nF capacitance) enabling bandwidth adjustment via external CF capacitor.

Galvanic isolation is achieved through physical separation of primary current path (IP+/IP–) and signal pins (VCC/VOUT/FILT/GND), validated per IEC62368-1 at 2200 VRMS withstand voltage and 6000 V surge. The primary conductor's 0.9 mΩ resistance minimizes power loss while supporting up to 250 A transient current per IEC61000-4-5.

Key Specifications

Pinout & Package

Package: SOIC-8 (5 mm × 4 mm), surface-mount, RoHS-compliant, MSL Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS712ELCTR-10A-T, MCS1803GS-10-P delivers tighter temperature stability and wider bandwidth; versus TLE4971-25S4, it offers simpler analog interface and lower system-level component count despite lower isolation rating.

Availability

MCS1803GS-10-P is available at Aetrix Electronics and suitable for motor control, automotive battery management, and switch-mode power supply designs requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.

Supply support for MCS1803GS-10-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, including DC/DC converters, LED drivers, and precision analog sensors.

The MCS1803 product line targets isolated current sensing in space-constrained, high-reliability applications such as electric vehicle subsystems and industrial automation, emphasizing accuracy, thermal stability, and minimal external component count.

FAQ

What is the maximum continuous primary current the MCS1803GS-10-P can handle without derating?

The device is rated for ±10 A continuous primary current with guaranteed ±2.5% total output error. Its 0.9 mΩ conductor resistance results in only 90 mW dissipation at ±10 A, allowing operation at full rating up to +125°C junction temperature without thermal derating in typical PCB layouts with 2 oz copper and thermal vias.

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 1.5 kΩ resistance and 1 nF capacitance, lowering bandwidth from 100 kHz (FILT open) to as low as 10 kHz (CF = 10 nF). This reduces input-referred noise from 50 mA(RMS) to ~16 mA(RMS) at 60 kHz, improving resolution for low-frequency measurements.

Can MCS1803GS-10-P measure bidirectional DC current accurately?

Yes. The device outputs a ratiometric voltage centered at VCC/2 (2.5 V @ 5 V), with ±200 mV swing for ±10 A. Zero-current output voltage drift is limited to ±15 mV over –40°C to +125°C, enabling accurate bidirectional measurement down to ±50 mA resolution without calibration.

Is external filtering required on the VOUT pin for ADC interfacing?

No external RC filter is required for standard 12-bit ADCs. VOUT drives ≥4.7 kΩ loads with 10 nF capacitive load tolerance; adding a 100 Ω series resistor and 1 nF capacitor at the ADC input suppresses high-frequency noise without affecting 4 µs rise time or introducing measurable phase lag.

What is the isolation creepage and clearance distance for MCS1803GS-10-P?

Per IEC62368-1, the SOIC-8 package provides 4.2 mm minimum external creepage and clearance between primary (IP+/IP–) and signal (VCC/VOUT/FILT/GND) leads. This meets reinforced insulation requirements for 350 VPK working voltage in pollution degree 2 environments.

Does the device require calibration during production?

No factory or system-level calibration is required. Sensitivity and offset are trimmed during wafer sort and final test; total output error remains within ±2.5% across –40°C to +125°C and lifetime, verified by ±1% lifetime drift specifications for both sensitivity and total error.

How does the differential Hall architecture reject external magnetic fields?

Two physically separated Hall plates sense opposing magnetic field polarities generated by the same primary current. Stray uniform fields induce equal voltages on both plates, which cancel in the differential amplifier stage. Layout asymmetry and spinning current techniques further reduce common-mode sensitivity to <0.1% of applied field.