Monolithic Power Systems Inc. MCS1805GS-330-B-P

Overview

MCS1805GS-330-B-P from Monolithic Power Systems is a bidirectional linear Hall-effect current sensor IC with galvanic isolation, 3kVRMS isolation voltage, and integrated over-current detection (OCD). It measures ±30A DC/AC currents with 44mV/A sensitivity, ±2.5% total accuracy, and 120kHz bandwidth in an SOIC-8 package. Used for real-time current monitoring in motor control inverters where primary conductor resistance is only 1.2mΩ.

For engineers reviewing the MCS1805GS-330-B-P datasheet, MCS1805GS-330-B-P pinout, MCS1805GS-330-B-P application, or MCS1805GS-330-B-P equivalent, this page delivers verified specifications including OCD threshold (±30A), ratiometric VOUT, 1µs OCD response time, and SOIC-8 isolation layout constraints-critical for IEC 62368-1-compliant power stage design.

Technical Context

The MCS1805GS-330-B-P employs a differential Hall array to reject external magnetic field gradients, enabling stable operation near noisy power conductors. Its spinning current technique minimizes offset drift, while factory trimming ensures ±2.5% total output error across –40°C to +125°C.

Galvanic isolation separates the 1.2mΩ primary current path (IP+/IP–) from the 3.3V analog signal domain (VCC/GND/VOUT/OCD), supporting basic insulation per IEC 62368-1 with 4.2mm creepage/clearance and 580VRMS working voltage.

Key Specifications

Pinout & Package

SOIC-8 package (5mm × 4mm) with internal primary conductor fusing on IP+ and IP– pins; 4.2mm creepage/clearance between primary and signal sides satisfies IEC 62368-1 basic insulation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS724LLCB-30AB-T and TMC1638-LA, the MCS1805GS-330-B-P delivers integrated OCD with 1µs response, tighter total accuracy (±2.5% vs ±3.5%), and superior high-frequency performance-making it optimal for fast-switching SiC/GaN inverter protection.

Availability

MCS1805GS-330-B-P is available at Aetrix Electronics and suitable for motor control inverters, automotive 48V DC/DC converters, industrial load management systems, and isolated switch-mode power supplies requiring stable component supply and long-term lifecycle support.

Supply support for MCS1805GS-330-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, with design centers in the US, China, and Taiwan.

The MCS1805 product line targets isolated current sensing in high-efficiency power conversion systems, emphasizing integration of magnetic sensing, isolation, and protection functions in compact surface-mount packages.

FAQ

What is the maximum continuous primary current rating for MCS1805GS-330-B-P?

The device supports ±30A continuous bidirectional current with thermal derating above +85°C ambient. Its 1.2mΩ primary conductor resistance limits self-heating to <1.5W at 30A RMS, enabling operation without heatsinking in PCB-mounted configurations per datasheet thermal characterization.

Does MCS1805GS-330-B-P require external calibration for accuracy?

No external calibration is required. Factory trimming ensures ±2.5% total output error across –40°C to +125°C, covering sensitivity, offset, nonlinearity, and temperature coefficients. System-level calibration is optional but not necessary for most industrial motor control applications.

How is the OCD threshold configured for MCS1805GS-330-B-P?

The OCD threshold is fixed at 100% of IPMAX (±30A) for the -B suffix variant. No external components or programming are needed-the internal comparator triggers /OCD within 1µs when primary current exceeds ±30A, with 3–12% hysteresis to prevent chatter during transient overloads.

Can MCS1805GS-330-B-P measure DC current accurately?

Yes. The spinning current technique and differential Hall architecture provide stable DC offset (<±10mV) and minimal drift (±1% lifetime), enabling accurate DC current measurement for battery monitoring and DC link applications without zero-point recalibration.

What is the recommended PCB layout for minimizing noise on VOUT?

Route VOUT with a dedicated 3mm-wide trace over solid GND plane; place 0.1µF ceramic bypass capacitor between VCC and GND within 3mm of pins 8 and 5; separate primary current path (pins 1–4) from signal traces by ≥8mm; avoid routing VOUT parallel to switching nodes or high-dI/dt paths.

Is MCS1805GS-330-B-P compliant with RoHS and REACH?

Yes. The device is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Certificate numbers B 113824 0012 Rev.00 and CBS 113824 0013 Rev.00 confirm compliance per MPS quality assurance documentation.

What is the minimum recommended pull-up resistor value for the /OCD pin?

The minimum recommended pull-up resistor is 10kΩ to VCC. Lower values improve rise time but increase static current; 10–100kΩ balances speed (<100ns) and power consumption (<0.3mA at 3.3V). Values above 500kΩ risk slow rise times and noise susceptibility per datasheet electrical characteristics.