Monolithic Power Systems Inc. MCS1805GS-530-B-P

Overview

MCS1805GS-530-B-P from Monolithic Power Systems is a bidirectional linear Hall-effect current sensor IC with galvanic isolation, 5V supply, ±30A sensing range, 66 mV/A sensitivity, and integrated over-current detection (OCD) with 1 µs response time. It replaces optoisolators in motor control and power supply current monitoring where high accuracy (±2.5% total error), 3 kVRMS isolation, and 120 kHz bandwidth are required.

For engineers reviewing the MCS1805GS-530-B-P datasheet, MCS1805GS-530-B-P pinout, MCS1805GS-530-B-P application, or MCS1805GS-530-B-P equivalent, this device delivers isolated analog current measurement with factory-trimmed offset, ratiometric output, differential magnetic field rejection, and fast OCD fault signaling for real-time protection in space-constrained industrial and automotive systems.

Technical Context

The MCS1805GS-530-B-P uses a differential Hall array to cancel stray magnetic fields and employs spinning current technique for ultra-low offset drift. Its primary conductor (IP+/IP−) forms an integrated low-resistance path (1.2 mΩ) enabling direct high-current sampling without external shunts.

Galvanic isolation between primary current terminals and signal pins meets IEC 62368-1 basic insulation requirements (3 kVRMS withstand, 580 VRMS working voltage). The /OCD pin provides open-drain, active-low fault signaling with user-configurable threshold (100% of IPMAX by default) and 3–12% hysteresis.

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 fused and electrically isolated from signal pins.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated linear current sensing applications.

Compared with ACS724LLCTR-30AB-T and TMC1100-BOB, the MCS1805GS-530-B-P uniquely combines 3 kVRMS isolation, 120 kHz bandwidth, and integrated 1 µs OCD - making it optimal for compact, high-reliability power conversion systems requiring both precision sensing and autonomous fault response.

Availability

MCS1805GS-530-B-P is available at Aetrix Electronics and suitable for motor control, switch-mode power supplies, automotive battery management, and industrial over-current protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MCS1805GS-530-B-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 MCS1805 product line targets isolated current sensing in energy-efficient power systems, emphasizing integration, accuracy, and safety certification to replace legacy optocoupler-based solutions in industrial and automotive applications.

FAQ

What is the maximum continuous primary current the MCS1805GS-530-B-P can measure?

The device is rated for ±30 A continuous bidirectional current. Its primary conductor resistance is 1.2 mΩ, resulting in only 1.08 mW power dissipation at ±30 A, enabling operation without heatsinking in typical PCB layouts. Surge current capability is 3000 A per IEC 61000-4-5.

Does the MCS1805GS-530-B-P require external calibration for zero-current offset?

No. The device features factory-trimmed offset with ±10 mV maximum error over -40°C to +125°C, eliminating need for system-level calibration. Spinning current technique and differential Hall architecture ensure stable offset drift of ≤±1 mV over lifetime.

How is the OCD threshold configured for the MCS1805GS-530-B-P?

The OCD threshold is fixed at 100% of IPMAX (±30 A) for this variant. No external components are needed - the threshold is set at wafer level. For custom thresholds (e.g., 150%), contact MPS for special-order variants like MCS1805GS-530-B-150.

Can the MCS1805GS-530-B-P be used with a 3.3 V supply?

No. The "5" in the part number denotes 5 V supply operation. For 3.3 V systems, use MCS1805GS-330-B-P (same ±30 A range, 44 mV/A sensitivity). Mixing supply voltages risks incorrect ratiometric scaling and out-of-spec output voltage range.

What is the recommended bypass capacitor for VCC?

A ceramic capacitor of 0.1 µF to 1 µF placed between VCC (pin 8) and GND (pin 5) is mandatory. This suppresses high-frequency noise coupling into the Hall sensor and ensures stable operation during fast current transients, especially critical for OCD timing accuracy.

Is the SOIC-8 package of MCS1805GS-530-B-P lead-free and RoHS compliant?

Yes. All MPS parts, including MCS1805GS-530-B-P, are lead-free, halogen-free, and fully compliant with the EU RoHS directive. The top marking "MCS1805" and date code (e.g., "MPSYWW") confirm genuine MPS packaging and green status per MPS Quality Assurance documentation.