Monolithic Power Systems Inc. MCS1800GS-25-P

Overview

MCS1800GS-25-P from Monolithic Power Systems is a galvanically isolated, linear Hall-effect current sensor optimized for ±25A DC/AC sensing with 55 mV/A sensitivity, ±3% total output error over -40°C to +125°C, and 200 VRMS working voltage isolation. It integrates differential Hall sensing, spinning-current offset cancellation, and an SOIC-8 package with 1.2 mΩ primary conductor resistance-used in motor phase current monitoring where compact size and magnetic immunity are critical.

For engineers reviewing the MCS1800GS-25-P datasheet, MCS1800GS-25-P pinout, MCS1800GS-25-P application, or MCS1800GS-25-P equivalent, this page delivers verified specifications including bandwidth adjustability (up to 100 kHz), ratiometric 3.3V output, 4 µs rise time, and isolation compliance per IEC62368-1-enabling rapid validation for industrial motor drives and SMPS over-current protection.

Technical Context

The MCS1800GS-25-P employs a dual-point differential Hall array with asymmetric primary conductor geometry to generate distinct vertical magnetic fields (B1 ≈ 1.15 mT/A, B2 ≈ 0.65 mT/A) at two integrated transducers, enabling stray-field rejection. Its internal signal chain includes dynamic offset cancellation, factory-trimmed sensitivity, and a built-in RC filter (RFi = 1.5 kΩ, CFi = 1 nF) that supports external bandwidth tuning via FILT pin capacitance.

Galvanic isolation is achieved through physical separation of primary current path (IP+/IP−) and signal pins (VCC/VOUT/FILT/GND), with 4.2 mm creepage/clearance and 1000 VRMS withstand voltage. The device operates exclusively from a 3.3V supply (3.0–3.6V range), delivering ratiometric analog output referenced to VCC/2 at zero current, with propagation delay of 1.5 µs and response time of 5 µs under full-scale step input.

Key Specifications

Pinout & Package

Package: SOIC-8 (5 mm × 4 mm, JEDEC MS-012 AA), surface-mount, lead-free/halogen-free, 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 ACS724LLCTR-20AU-T and TLE4971-25S4, the MCS1800GS-25-P offers superior thermal performance (1.2 mΩ vs ≥1.5 mΩ), tighter accuracy (±3% vs ±5%), and integrated bandwidth tuning-making it optimal for space-constrained, thermally sensitive motor control and SMPS designs requiring stable long-term calibration.

Availability

MCS1800GS-25-P is available at Aetrix Electronics and suitable for motor control, switch-mode power supplies, automotive on-board chargers, and industrial load management requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for MCS1800GS-25-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-focused on energy efficiency and miniaturization.

The MCS1800 product line delivers isolated current sensing solutions targeting high-reliability industrial and automotive applications where galvanic isolation, magnetic immunity, and thermal stability are essential design constraints.

FAQ

What is the maximum continuous primary current the MCS1800GS-25-P can handle without exceeding junction temperature limits?

The device supports ±25 A continuous primary current within its specified accuracy range. Self-heating data shows ≤100°C die temperature rise at 50 A DC on a 4 oz copper evaluation board. For sustained 25 A operation, ensure PCB layout provides ≥2200 mm² of 4 oz copper connected to IP+/IP− pins with thermal vias to maintain TJ ≤ 125°C ambient.

How does the FILT pin affect noise performance and bandwidth trade-offs?

Connecting a capacitor (CF) between FILT and GND forms a first-order low-pass filter with internal RFi (1.5 kΩ) and CFi (1 nF). A 1 nF CF yields ~100 kHz bandwidth and 50 mA RMS noise; increasing CF to 10 nF reduces bandwidth to ~10 kHz and noise to ~16 mA RMS. No external capacitor defaults to maximum bandwidth and highest noise floor.

Can the MCS1800GS-25-P measure bidirectional AC current waveforms accurately?

Yes-the device outputs a ratiometric analog voltage centered at VCC/2 (1.65 V @ 3.3 V), with polarity indicating current direction. It maintains ±3% total output error across -25 A to +25 A at 50/60 Hz and up to 10 kHz, supported by differential Hall sensing that rejects common-mode magnetic interference from nearby conductors.

What isolation certifications apply to the MCS1800GS-25-P, and how is creepage maintained?

The device is certified to IEC62368-1 for basic insulation with 1000 VRMS withstand voltage (60 s) and 200 VRMS working voltage. External creepage and clearance between IP+/IP− and signal pins are both 4.2 mm, achieved via SOIC-8 package molding and internal die placement-no conformal coating or spacing adjustments needed on PCB.

Is the zero-current output voltage (VOUT(Q)) stable over temperature and supply variation?

VOUT(Q) is nominally VCC/2 and exhibits ratiometric behavior: KVO = 99–101% across 3.0–3.6 V supply, and thermal drift is limited to ±15 mV over -40°C to +125°C. This stability enables direct connection to 12-bit ADCs without external gain/offset compensation in most industrial applications.

Does the MCS1800GS-25-P require external calibration for production use?

No-factory trimming ensures ±2.5% sensitivity error and ±15 mV offset voltage over temperature without user calibration. Lifetime drift is ±1% for both sensitivity and total output error, making it suitable for applications where recalibration is impractical, such as sealed motor drives or automotive battery systems.

How does the differential Hall architecture reject external magnetic fields?

The integrated Hall array measures the magnetic field difference between two spatially separated points above the asymmetric primary conductor. Uniform external fields induce identical signals at both points, canceling out in the differential amplifier stage-while the conductor's field gradient produces a measurable differential voltage proportional to current.