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Monolithic Power Systems Inc. MCS1805GS-350-B-P
- Part No.:
- MCS1805GS-350-B-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Unclassified
- Package:
- Datasheet:
-
MCS1805GS-350-B-P.pdf
- Description:
- LINEAR HALL-EFFECT CURRENT SENSO
- Quantity:
- Payment:
- Shipping:
Inventory:2,130
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Product details
Overview
MCS1805GS-350-B-P from Monolithic Power Systems is a bidirectional linear Hall-effect current sensor IC with galvanic isolation, 3.3V supply, ±50A sensing range, 26.4 mV/A sensitivity, and integrated over-current detection (OCD) with 1µs response time. It replaces optoisolators in motor control and power supply feedback loops where high accuracy, noise immunity, and 3kVRMS isolation are required.
For engineers reviewing the MCS1805GS-350-B-P datasheet, MCS1805GS-350-B-P pinout, MCS1805GS-350-B-P application, or MCS1805GS-350-B-P equivalent, this device delivers ratiometric analog output, differential magnetic field rejection, ±2.5% total accuracy across -40°C to +125°C, and SOIC-8 footprint compatibility for space-constrained industrial and automotive current monitoring.
Technical Context
The MCS1805GS-350-B-P uses a differential Hall array to cancel stray magnetic fields and a spinning current technique to minimize offset drift. Its primary conductor (IP+ and IP−) forms an isolated current path with 1.2 mΩ resistance, enabling direct integration into high-current paths without external shunts.
Galvanic isolation is achieved via internal molding and package design, delivering 3kVRMS withstand voltage and 580VRMS working voltage per IEC 62368-1. The OCD function triggers at 100% of IPMAX (±50A) by default, with open-drain /OCD output and 3–12% hysteresis for noise-immune fault latching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V ±0.3V - Enables direct interface with 3.3V logic and low-power microcontrollers without level-shifting. |
| Current Range | ±50A bidirectional - Supports full-scale AC/DC current measurement in motor phase legs or DC bus lines. |
| Sensitivity | 26.4 mV/A - Delivers 1.32V full-scale output swing (±50A × 26.4 mV/A), compatible with 12-bit ADCs. |
| Total Accuracy | ±2.5% - Includes linearity, offset, gain, and temperature error; sufficient for Class 0.5 energy metering and closed-loop motor control. |
| Bandwidth | 120kHz - Captures fast transients in switch-mode power supplies and PWM-driven inverters. |
| OCD Response Time | 1µs - Enables cycle-by-cycle over-current protection in SiC/GaN-based converters. |
| Isolation Rating | 3kVRMS - Meets reinforced isolation requirements for functional safety in industrial drives and EV chargers. |
Pinout & Package
Package: SOIC-8 (5mm × 4mm, creepage/clearance ≥4.2 mm), surface-mount, RoHS-compliant, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IP+ | Primary current input (+) | Fused internal terminal for high-side or bidirectional current path; connects directly to power rail. |
| 3, 4 IP− | Primary current return (−) | Fused internal terminal completing isolated current loop; enables Kelvin-sense-like isolation integrity. |
| 5 GND | Signal ground reference | Reference for VOUT and /OCD; must be tied to controller ground, not power ground, to maintain isolation barrier. |
| 6 /OCD | Open-drain over-current flag | Active-low fault signal; requires external pull-up (10–500 kΩ) to VCC for interrupt generation or latch reset. |
| 7 VOUT | Analog current-proportional output | Ratiometric voltage (VCC/2 ±1.32V for ±50A); drives 4.7kΩ load with ≤4.7nF capacitance. |
| 8 VCC | 3.3V supply input | Requires 0.1–1µF bypass capacitor to GND; UVLO threshold at 2.5V ensures clean startup under brownout. |
Key Features
| Feature | Design Value |
|---|---|
| Differential Hall sensing | Rejects external gradient magnetic fields up to ±100 Oe, eliminating need for magnetic shielding in noisy environments. |
| Factory-trimmed accuracy | ±2.5% total error over temperature without calibration-reduces BOM count and firmware compensation overhead. |
| Integrated OCD | Configurable threshold (50–240% IPMAX) with 1µs response and 3–12% hysteresis-enables robust fault handling without external comparators. |
| Low-noise density | 100 µA(rms)/√Hz input-referred noise-supports high-resolution current monitoring down to <100mA RMS in 120kHz bandwidth. |
| Small SOIC-8 footprint | 5mm × 4mm body with 1.2mΩ primary resistance-minimizes board area and power loss versus discrete shunt + isolator solutions. |
Applications
| Motor Control | Switch-Mode Power Supplies |
|---|---|
|
Use Scenario: Real-time phase current sensing in 3-phase BLDC inverters for field-oriented control (FOC). IC Role / Device Role / Timing Role: Isolated analog current feedback element with 120kHz bandwidth and sub-µs OCD response for torque ripple suppression and short-circuit shutdown. Use Value: Enables precise current regulation without shunt resistor heating or optocoupler latency, improving efficiency and thermal margin. |
Use Scenario: Primary-side current monitoring in LLC resonant converters for peak-current-mode control and over-load protection. IC Role / Device Role / Timing Role: High-bandwidth, isolated current transducer feeding ADC and fault logic; OCD output directly gates PWM controller disable. Use Value: Eliminates gate-drive transformer complexity while maintaining 3kVRMS isolation and <1µs fault reaction-critical for GaN-based high-frequency designs. |
| Automotive Systems | Load Detection and Management |
|
Use Scenario: Battery pack current monitoring in 12V/48V mild-hybrid systems for state-of-charge (SoC) estimation and fuseless over-current protection. IC Role / Device Role / Timing Role: Bidirectional isolated sensor interfacing to ASIL-B compliant MCU; OCD output feeds system safety manager for ISO 26262 fault response. Use Value: Meets automotive AEC-Q100 Grade 1 (−40°C to +125°C) and provides reinforced isolation without optical degradation over lifetime. |
Use Scenario: Smart circuit breaker supervision in data center PDUs for real-time load profiling and predictive maintenance. IC Role / Device Role / Timing Role: High-accuracy, low-drift current monitor with ratiometric output-enabling stable readings across wide supply voltage variation (3.0–3.6V). Use Value: Reduces calibration frequency and supports long-term drift compensation via factory-trimmed offset and sensitivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated linear current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS724LLCTR-50AB-T | 5V supply only; ±50A range; 40 mV/A sensitivity; no integrated OCD; 2.4kVRMS isolation | Lacks fast OCD and 3.3V operation-requires external comparator and level shift for 3.3V systems | Select when cost-sensitive designs accept added external components and lower isolation rating |
| TMC1100-50B | 3.3V supply; ±50A; 25 mV/A; integrated OCD; 2.5kVRMS isolation; SPI digital output only | Digital interface eliminates ADC requirement but adds firmware dependency and lacks analog fallback | Select when digital control loop architecture dominates and analog redundancy is not needed |
Compared with ACS724LLCTR-50AB-T and TMC1100-50B, the MCS1805GS-350-B-P uniquely combines 3.3V analog operation, 3kVRMS isolation, and hardware OCD in SOIC-8-offering lowest component count and fastest fault response for industrial and automotive analog-control systems.
Availability
MCS1805GS-350-B-P is available at Aetrix Electronics and suitable for motor control, switch-mode power supplies, automotive battery management, and load detection applications requiring stable component supply, long-lifecycle support, and certified isolation performance.
Supply support for MCS1805GS-350-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 delivers isolated current sensing for high-efficiency power conversion systems, targeting applications where accuracy, speed, and safety-certified isolation replace legacy shunt + optocoupler architectures.
FAQ
What is the default OCD threshold for MCS1805GS-350-B-P?
The default OCD threshold is set to 100% of IPMAX (±50A), meaning the /OCD pin asserts low when sensed current exceeds ±50A. This threshold is factory-configured and non-adjustable without custom ordering; alternative thresholds (e.g., 150% IPMAX) require part number variants like MCS1805GS-350-B-P150.
Can MCS1805GS-350-B-P measure unidirectional current?
No-MCS1805GS-350-B-P is strictly bidirectional (suffix "B"). For unidirectional operation (0–50A), use MCS1805GS-350-U-P, which outputs 0.1×VCC at zero current and scales linearly to VCC at +50A, with different sensitivity (52.8 mV/A) and offset behavior.
What is the maximum primary conductor current the device can handle continuously?
The primary conductor is rated for continuous operation at ±50A (IPMAX). Absolute maximum surge current is 3000A (8µs/20µs pulse), and transient capability is 200A (10ms), per IEC 61000-4-5 testing-exceeding typical industrial overload requirements.
Does VOUT remain ratiometric if VCC varies within its operating range?
Yes-VOUT maintains 98–102% ratiometry to VCC across the full 3.0–3.6V supply range, verified at TJ = −40°C to +125°C. This ensures consistent scaling even during input rail droop, critical for accurate current reconstruction in variable-voltage systems.
How is isolation verified during production?
Every unit undergoes 100% production testing per IEC 62368-1:2018 for 3000VRMS withstand isolation voltage at 60 seconds. Dielectric surge strength is validated at 6000V (1.2µs/50µs waveform), and external creepage/clearance is guaranteed at ≥4.2 mm between primary and signal pins.
What PCB layout practices maximize noise immunity?
Route IP+ and IP− traces symmetrically and tightly coupled to minimize loop area; keep VCC bypass capacitor (0.1–1µF) within 2 mm of Pin 8; separate primary and signal ground planes with isolation gap ≥4.2 mm; avoid routing noisy signals near VOUT or /OCD traces.
Is the SOIC-8 package lead-free and halogen-free?
Yes-MCS1805GS-350-B-P complies with RoHS Directive 2011/65/EU and is both lead-free and halogen-free, with green status confirmed on the MPS Quality Assurance website and documented in Certificate Number B 113824 0012 Rev.00.
MCS1805GS-350-B-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- *
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
MCS1805GS-350-B-P FAQ
1.How can I place an order for MCS1805GS-350-B-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MCS1805GS-350-B-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-350-B-P reliable?
The price and inventory of MCS1805GS-350-B-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-350-B-P is usually 5 days.
3.What payment methods are accepted for MCS1805GS-350-B-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCS1805GS-350-B-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCS1805GS-350-B-P?
MCS1805GS-350-B-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCS1805GS-350-B-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-350-B-P?
For technical support, including MCS1805GS-350-B-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCS1805GS-350-B-P requirements.
6.How does Aetrix verify that MCS1805GS-350-B-P is sourced from the original manufacturer or authorized distributors?
All MCS1805GS-350-B-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-350-B-P meets industry standards.
7.What is the process for return or replacement of MCS1805GS-350-B-P?
All MCS1805GS-350-B-P units undergo pre-shipment inspection (PSI). If there is an issue with MCS1805GS-350-B-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-350-B-P part is unused and in its original packaging.
Return procedure for MCS1805GS-350-B-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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