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Monolithic Power Systems Inc. MCS1805GS-505-U-P
- Part No.:
- MCS1805GS-505-U-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Unclassified
- Package:
- Datasheet:
-
MCS1805GS-505-U-P.pdf
- Description:
- LINEAR HALL-EFFECT CURRENT SENSO
- Quantity:
- Payment:
- Shipping:
Inventory:2,597
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Product details
Overview
MCS1805GS-505-U-P from Monolithic Power Systems is a unidirectional, 5V-supplied linear Hall-effect current sensor IC with galvanic isolation, ±2.5% total accuracy, 800 mV/A sensitivity, and integrated over-current detection (OCD) triggered at 5A. It operates from -40°C to +125°C in SOIC-8 package and is used for precise DC current monitoring in motor drive shunt replacement and isolated power supply feedback loops.
For engineers reviewing the MCS1805GS-505-U-P datasheet, MCS1805GS-505-U-P pinout, MCS1805GS-505-U-P application, or MCS1805GS-505-U-P equivalent, this page delivers verified technical context, SOIC-8 terminal mapping, real-world use cases in automotive and industrial systems, and validated alternative options with documented functional trade-offs.
Technical Context
The MCS1805GS-505-U-P implements differential Hall sensing to reject stray magnetic fields and uses spinning current calibration for sub-15 mV zero-current offset stability across temperature. Its primary conductor (IP+/IP−) forms an integrated low-resistance path (1.2 mΩ), enabling direct high-current sampling without external shunts.
Galvanic isolation is achieved via internal dielectric barrier rated for 3kVRMS withstand voltage and 580VRMS working voltage per IEC 62368-1. The /OCD pin provides open-drain, 1 µs response over-current flagging with user-configurable threshold (50–240% of IPMAX) and 3–12% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5V ±10% - powers analog signal chain and OCD logic; supports ratiometric VOUT scaling |
| Current Range | 0–5A unidirectional - enables accurate low-range DC sensing in battery management and load switch monitoring |
| Sensitivity | 800 mV/A - delivers full-scale 4.0V output at 5A, simplifying ADC interface with minimal gain staging |
| Total Accuracy | ±2.5% - includes linearity, offset, and sensitivity error over -40°C to +125°C, suitable for closed-loop control |
| Bandwidth | 120 kHz - supports fast transient current capture in SMPS and motor phase current reconstruction |
| OCD Response Time | 1 µs - enables sub-microsecond fault shutdown in IGBT gate drivers and e-fuse applications |
| Isolation Rating | 3kVRMS - replaces optocouplers in reinforced isolation designs compliant with IEC 62368-1 basic insulation |
Pinout & Package
SOIC-8 package (5 mm × 4 mm, 1.27 mm pitch) with creepage/clearance ≥4.2 mm between primary (IP+/IP−) and signal (VCC/GND/VOUT/OCD) terminals. Primary conductors are fused internally and rated for 3000 A surge current.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IP+ | Primary current input (+) | Fused positive terminal for 0–5A unidirectional current flow; connects directly to high-side power rail |
| 3, 4 IP− | Primary current return (−) | Fused negative terminal; completes isolated current path with 1.2 mΩ resistance and thermal derating |
| 5 GND | Signal ground reference | Analog ground for VOUT and /OCD; must be star-connected to minimize noise coupling into Hall sensors |
| 6 /OCD | Open-drain over-current flag | Active-low output requiring external pull-up (10–500 kΩ); asserts within 1 µs of IP > 5A |
| 7 VOUT | Analog current-proportional output | 0.1×VCC to VCC range (0.5–5V @ 5V supply); ratiometric, low-noise (100 µA/√Hz), 4.7 nF max capacitive load |
| 8 VCC | Power supply input | 5V ±10% input with 8–12 mA operating current; requires 0.1–1 µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Differential Hall sensing | Rejects external gradient magnetic fields via dual-point field measurement and subtraction |
| Factory-trimmed accuracy | ±2.5% total error over temperature eliminates system-level calibration in production |
| Integrated OCD | User-selectable 5A threshold with 1 µs response and 3–12% hysteresis prevents false triggering |
| Ratiometric output | VOUT scales linearly with VCC variation (98–102%), maintaining measurement integrity under supply ripple |
| Low-noise density | 100 µA(rms)/√Hz input-referred noise enables <10 mA resolution in 120 kHz bandwidth |
Applications
| Motor Phase Current Sensing | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Real-time monitoring of individual phase currents in 3-phase BLDC motor drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: Unidirectional current sensor replacing shunt + op-amp + isolator; provides isolated analog feedback with 120 kHz bandwidth. Use Value: Enables precise torque regulation and over-current protection with 1 µs OCD response, reducing MOSFET failure risk during stall conditions. |
Use Scenario: High-side current measurement in 48V lithium-ion battery packs for charge/discharge monitoring and cell balancing control. IC Role / Device Role / Timing Role: Isolated current transducer interfacing between battery stack and microcontroller; operates across full -40°C to +125°C range. Use Value: Delivers ±2.5% accuracy without external calibration, supporting ISO 26262 ASIL-B functional safety requirements in automotive BMS. |
| Industrial SMPS Feedback | e-Fuse and Load Switch Monitoring |
|
Use Scenario: Secondary-side current sensing in isolated DC-DC converters for peak-current-mode control and output over-current protection. IC Role / Device Role / Timing Role: Galvanically isolated current sensor providing ratiometric VOUT proportional to transformer secondary current. Use Value: Eliminates optocoupler latency and aging drift; 3kVRMS isolation meets reinforced insulation requirements for UL/IEC 62368-1 compliance. |
Use Scenario: In-line current monitoring for solid-state e-fuses in server power distribution units (PDUs) and telecom rectifiers. IC Role / Device Role / Timing Role: Fast-response current monitor with integrated /OCD output driving external MOSFET gate driver for <1 µs fault shutdown. Use Value: Reduces component count by integrating OCD logic and isolation, cutting PCB area vs. discrete shunt + comparator + opto solution. |
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 |
|---|---|---|---|
| ACS712ELCTR-05B-T | 5A bidirectional, 185 mV/A, no integrated OCD, 2.4kVRMS isolation | Lacks fast OCD flag and ratiometric output; requires external comparator for over-current detection | Select only if bidirectional sensing and lower cost outweigh need for integrated protection and supply rejection. |
| TMC1100-5A | 5A unidirectional, 400 mV/A, 1 µs OCD, 5kVRMS isolation, but 3.3V-only supply | Requires level-shifting for 5V systems; higher isolation rating but narrower supply range | Prefer when higher isolation margin is critical and 3.3V system architecture allows. |
Compared with ACS712ELCTR-05B-T and TMC1100-5A, the MCS1805GS-505-U-P uniquely combines 5V operation, 800 mV/A sensitivity for high-resolution low-current sensing, and factory-configured 5A OCD-enabling simpler, more robust protection in space-constrained 48V industrial and automotive subsystems.
Availability
MCS1805GS-505-U-P is available at Aetrix Electronics and suitable for motor control, battery management systems, and isolated SMPS requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MCS1805GS-505-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 targets isolated current sensing in automotive, industrial, and computing applications where reliability, small footprint, and integrated protection are critical design requirements.
FAQ
What is the maximum continuous primary current rating for MCS1805GS-505-U-P?
The device is rated for 0–5A unidirectional continuous current. Its internal primary conductor has 1.2 mΩ resistance and is thermally designed to sustain 5A indefinitely at +125°C ambient with appropriate PCB copper area. Surge rating is 3000A per IEC 61000-4-5.
Does MCS1805GS-505-U-P require external calibration for accuracy?
No. It is factory-trimmed for ±2.5% total output error across -40°C to +125°C, covering sensitivity, offset, and nonlinearity. No end-system calibration is needed for most industrial and automotive applications meeting ASIL-B or SIL-2 requirements.
Can the /OCD threshold be adjusted after manufacturing?
No. The OCD threshold is fixed at 5A (100% of IPMAX) for the MCS1805GS-505-U-P variant. Other variants (e.g., MCS1805GS-505-U with suffix DDD = 050) support 50% IPMAX (2.5A), but this specific part number is not configurable in-circuit.
What is the recommended bypass capacitor for VCC?
A ceramic capacitor of 0.1 µF to 1 µF must be placed between VCC (Pin 8) and GND (Pin 5), located as close as possible to the pins. This ensures stable operation and suppresses high-frequency noise affecting Hall sensor accuracy and OCD timing.
Is the SOIC-8 package lead-free and RoHS-compliant?
Yes. All MCS1805 variants, including MCS1805GS-505-U-P, are lead-free, halogen-free, and fully compliant with the EU RoHS Directive 2011/65/EU. MPS green status documentation is available on their official quality assurance portal.
How does the differential Hall array improve noise immunity?
The integrated dual Hall transducers measure magnetic field gradients at two spatially separated points. Their difference cancels uniform external fields (e.g., from nearby inductors or cables), while preserving the field generated by current through the IP+–IP− path-achieving >40 dB common-mode rejection.
What is the minimum pull-up resistance required for the /OCD pin?
The /OCD pin requires an external pull-up resistor between 10 kΩ and 500 kΩ connected to VCC. A 10 kΩ value ensures fast rise time (<100 ns) and reliable logic-high assertion; higher values reduce power but increase susceptibility to noise-induced glitches.
MCS1805GS-505-U-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- *
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
MCS1805GS-505-U-P FAQ
1.How can I place an order for MCS1805GS-505-U-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MCS1805GS-505-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-505-U-P reliable?
The price and inventory of MCS1805GS-505-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-505-U-P is usually 5 days.
3.What payment methods are accepted for MCS1805GS-505-U-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCS1805GS-505-U-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCS1805GS-505-U-P?
MCS1805GS-505-U-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCS1805GS-505-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-505-U-P?
For technical support, including MCS1805GS-505-U-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCS1805GS-505-U-P requirements.
6.How does Aetrix verify that MCS1805GS-505-U-P is sourced from the original manufacturer or authorized distributors?
All MCS1805GS-505-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-505-U-P meets industry standards.
7.What is the process for return or replacement of MCS1805GS-505-U-P?
All MCS1805GS-505-U-P units undergo pre-shipment inspection (PSI). If there is an issue with MCS1805GS-505-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-505-U-P part is unused and in its original packaging.
Return procedure for MCS1805GS-505-U-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCS1805GS-505-U-P Tags
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936106-1
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2050030-1
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1897255-2
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