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Monolithic Power Systems Inc. MCS1805GS-305-U-P

Name: MCS1805GS-305-U-P
Brand: Monolithic Power Systems Inc.
SKU: MCS1805GS-305-U-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCS1805GS-305-U-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Unclassified

Package:

Datasheet:: MCS1805GS-305-U-P.pdf

Description:: LINEAR HALL-EFFECT CURRENT SENSO

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Inventory:1,493

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Product details

Overview

MCS1805GS-305-U-P from Monolithic Power Systems is a unidirectional linear Hall-effect current sensor IC with galvanic isolation, 3.3V supply, 5A rated range, 528 mV/A sensitivity, and integrated over-current detection (OCD) with 1 µs response time. It delivers ±2.5% total output error across –40°C to +125°C and replaces optoisolators in high-reliability motor control and power supply monitoring.

For engineers reviewing the MCS1805GS-305-U-P datasheet, MCS1805GS-305-U-P pinout, MCS1805GS-305-U-P application, or MCS1805GS-305-U-P equivalent, this device supports precise DC/AC current sensing in space-constrained industrial inverters, battery management systems, and isolated DC-DC converters where low-noise density (100 µA_rms/√Hz), 120 kHz bandwidth, and 3 kV_RMS isolation are critical.

Technical Context

The MCS1805GS-305-U-P uses a differential Hall array to reject external magnetic gradients and employs spinning current calibration for ultra-stable offset (<±15 mV at 0 A). Its primary conductor (1.2 mΩ) enables direct high-current path integration while maintaining signal integrity via internal isolation barriers.

It integrates fast OCD with user-configurable threshold (50–240% of I_PMAX) and open-drain /OCD output, alongside ratiometric analog VOUT proportional to current. The SOIC-8 package provides 4.2 mm creepage/clearance and meets IEC 62368-1 basic insulation requirements at 580 V_RMS working voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.3 V ±10%; powers internal Hall sensors and signal chain with 8–12 mA quiescent current
Current Range	0–5 A unidirectional; optimized for low-range precision sensing in battery charge/discharge paths
Sensitivity	528 mV/A; enables high-resolution output (0–1.65 V full-scale) without external gain stages
Total Output Error	±2.5% over –40°C to +125°C; includes linearity, offset, and sensitivity drift for production-grade accuracy
Isolation Rating	3 kV_RMS withstand, 580 V_RMS working voltage; certified per IEC 62368-1 for reinforced insulation in mains-connected systems
OCD Response Time	1 µs; detects overcurrent events faster than typical protection ICs, enabling sub-microsecond fault shutdown
Noise Density	100 µA_rms/√Hz; ensures stable measurement in noisy switching environments like SMPS and motor drives

Pinout & Package

SOIC-8 package (5 mm × 4 mm), surface-mount, with primary current terminals (IP+, IP−) physically isolated from signal pins (VCC, GND, VOUT, /OCD) by internal dielectric barrier.

Pin/Terminal	Circuit Role	Design Meaning
1, 2	IP+	Primary current input (+); fused internal conductor rated for 3000 A surge (8/20 µs)
3, 4	IP−	Primary current return (−); fused internal conductor; forms low-resistance (1.2 mΩ) current path
5	GND	Signal ground reference for analog output and OCD logic; isolated from IP path
6	/OCD	Open-drain over-current flag; active-low, requires external pull-up (10–500 kΩ to VCC)
7	VOUT	Analog output voltage (0.1×VCC to VCC); ratiometric, proportional to sensed current
8	VCC	3.3 V supply input; requires 0.1–1 µF bypass capacitor to GND for noise immunity

Key Features

Feature	Design Value
Differential Hall Sensing	Rejects stray magnetic fields via dual-point field sampling; eliminates need for external shielding
Factory-Trimmed Accuracy	±2.5% total error over temperature without end-of-line calibration
Integrated OCD	Configurable threshold (50–240% of I_PMAX) with 1 µs response-no external comparator required
Low-Noise Signal Chain	100 µA_rms/√Hz input-referred noise enables <10 mA resolution in 5 A range
Small Footprint Isolation	SOIC-8 replaces bulkier optocoupler-based solutions while delivering 3 kV_RMS isolation

Applications

Motor Control

Battery Management System

Use Scenario: Real-time phase current monitoring in BLDC inverter half-bridges.

IC Role / Device Role / Timing Role: Unidirectional current sensor on low-side shunt replacement; provides isolated feedback to PWM controller.

Use Value: Enables precise torque control and stall detection with 528 mV/A gain and 120 kHz bandwidth matching FET switching dynamics.

Use Scenario: Cell-string current measurement during charging/discharging in 48 V EV auxiliary batteries.

IC Role / Device Role / Timing Role: Primary current monitor on main pack output; feeds BMS microcontroller via isolated analog interface.

Use Value: Delivers ±2.5% accuracy across automotive temperature range without calibration, reducing BOM cost vs. shunt+isolator combos.

Industrial SMPS

Over-Current Fault Protection

Use Scenario: Input current sensing in 1 kW AC-DC front-end rectifiers.

IC Role / Device Role / Timing Role: High-side current monitor feeding PFC controller; withstands 580 V_RMS working voltage.

Use Value: Eliminates high-voltage level-shifting circuitry while maintaining 3 kV_RMS isolation compliance per IEC 62368-1.

Use Scenario: Fast trip detection in programmable power supplies with adjustable current limits.

IC Role / Device Role / Timing Role: Dedicated OCD trigger with 1 µs latency; asserts /OCD to disable gate drivers upon overcurrent.

Use Value: Reduces fault propagation delay by >90% versus discrete comparator solutions, preventing MOSFET destruction.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ACS712ELC-05B	5 V supply only; 185 mV/A sensitivity; no integrated OCD; 2.5 kV_RMS isolation	Lacks fast OCD output and ratiometric VOUT; requires external comparator for overcurrent	Choose when cost-sensitive, low-bandwidth (<50 kHz), and OCD not required
TMC1100-5A	3.3 V supply; 500 mV/A sensitivity; 1.5 µs OCD response; 2.5 kV_RMS isolation	Lower isolation rating and no factory-trimmed ±2.5% total error spec	Choose when footprint compatibility with TMC family is prioritized over certification-grade isolation

Compared with ACS712ELC-05B and TMC1100-5A, the MCS1805GS-305-U-P uniquely combines 3 kV_RMS certification, 1 µs OCD, and ±2.5% total error in a single SOIC-8 package-enabling simplified, safety-compliant designs in high-reliability power systems.

Availability

MCS1805GS-305-U-P is available at Aetrix Electronics and suitable for motor control, battery management systems, and industrial switch-mode power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MCS1805GS-305-U-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 delivers isolated current sensing for industrial, automotive, and computing applications where reliability, small size, and integrated protection features are essential.

FAQ

What is the maximum continuous primary current the MCS1805GS-305-U-P can handle?

The MCS1805GS-305-U-P is rated for 0–5 A unidirectional continuous current. Its internal primary conductor has 1.2 mΩ resistance and is tested to survive 200 A transient (10 ms) and 3000 A surge (8/20 µs), but sustained operation above 5 A exceeds its specified accuracy and thermal limits.

Does the /OCD pin require an external pull-up resistor?

Yes. The /OCD pin is open-drain and must be pulled up to VCC using a resistor between 10 kΩ and 500 kΩ. A 10 kΩ pull-up ensures fast rise time and robust noise immunity, while higher values reduce power consumption but increase susceptibility to EMI.

Can the MCS1805GS-305-U-P measure AC current?

Yes. Its linear Hall architecture supports true RMS AC current measurement up to 120 kHz bandwidth. With unidirectional configuration, it measures the absolute value of AC waveforms (e.g., rectified output), making it suitable for AC input monitoring in SMPS and inverters.

How does the ratiometric VOUT improve system accuracy?

VOUT scales directly with VCC (98–102% ratiometry), so ADC reference and sensor supply can share the same rail. This cancels supply-induced gain errors, eliminating need for precision voltage references and improving end-to-end measurement stability across varying input voltages.

Is the MCS1805GS-305-U-P compliant with automotive AEC-Q200?

No. The MCS1805GS-305-U-P is qualified for industrial temperature range (–40°C to +125°C) and meets IEC 62368-1 isolation standards, but it is not AEC-Q200 stress-tested or certified for automotive use. For automotive applications, consult MPS's AEC-Q200-qualified variants such as MCS1805GS-310-U-A.

What is the recommended PCB layout for minimizing magnetic interference?

Route high-current traces symmetrically between IP+ and IP− pins to cancel magnetic fields. Keep signal traces (VOUT, /OCD) away from primary current paths and use ground planes beneath signal layers. Avoid placing ferromagnetic components within 5 mm of the SOIC-8 body to prevent Hall sensor perturbation.

Does the device include internal over-temperature protection?

No. The MCS1805GS-305-U-P does not integrate thermal shutdown. Its junction temperature is rated to 165°C, and safe operation relies on proper PCB copper area, ambient airflow, and derating per the thermal characteristics in the datasheet. External thermal monitoring is recommended for high-power applications.

MCS1805GS-305-U-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: *

Packaging:: Tape & Reel (TR)

Product Status:: Active

MCS1805GS-305-U-P FAQ

1.How can I place an order for MCS1805GS-305-U-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MCS1805GS-305-U-P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MCS1805GS-305-U-P reliable?

The price and inventory of MCS1805GS-305-U-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCS1805GS-305-U-P is usually 5 days.

3.What payment methods are accepted for MCS1805GS-305-U-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCS1805GS-305-U-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MCS1805GS-305-U-P?

MCS1805GS-305-U-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCS1805GS-305-U-P order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MCS1805GS-305-U-P?

For technical support, including MCS1805GS-305-U-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCS1805GS-305-U-P requirements.

6.How does Aetrix verify that MCS1805GS-305-U-P is sourced from the original manufacturer or authorized distributors?

All MCS1805GS-305-U-P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCS1805GS-305-U-P meets industry standards.

7.What is the process for return or replacement of MCS1805GS-305-U-P?

All MCS1805GS-305-U-P units undergo pre-shipment inspection (PSI). If there is an issue with MCS1805GS-305-U-P, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MCS1805GS-305-U-P part is unused and in its original packaging.

Return procedure for MCS1805GS-305-U-P:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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