Monolithic Power Systems Inc. EVCS1806-S-3-40-00A

Overview

EVCS1806-S-3-40-00A from Monolithic Power Systems is a 2-layer evaluation board for the MCS1806GS-3-40 Hall-effect current sensor, supporting ±40 A primary current sensing at 3.3 V supply with 33 mV/A typical sensitivity and 3 kVRMS galvanic isolation. It enables rapid validation of isolated current measurement in motor drives, power supplies, and battery management systems.

For engineers reviewing the EVCS1806-S-3-40-00A datasheet, EVCS1806-S-3-40-00A pinout, EVCS1806-S-3-40-00A application, or EVCS1806-S-3-40-00A equivalent, this board provides verified test conditions (VCC = 3.3 V, IP = ±40 A), on-board screw terminals (IP+/IP−), configurable bandwidth via C4, and direct VOUT access for oscilloscope or multimeter measurement.

Technical Context

The EVCS1806-S-3-40-00A implements a differential Hall array to reject stray magnetic fields and supports only DC/AC current sensing - no internal signal conditioning beyond linear analog output. Its isolation barrier separates primary conductor pins (IP+, IP−) from low-voltage sensor domain (VCC, GND, VOUT, FILT).

Board-level design includes 0.1 µF ceramic decoupling (C1) at VCC, 4.7 µF bulk capacitance (C2), and an unpopulated capacitor footprint (C4) to set bandwidth - lower C4 values reduce output ripple noise per application note guidance.

Key Specifications

Availability

EVCS1806-S-3-40-00A is available at Aetrix Electronics and suitable for motor control validation, industrial power supply monitoring, and battery pack current sensing requiring stable component supply and repeatable bench testing capability.

Supply support for EVCS1806-S-3-40-00A 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.

This evaluation board belongs to MPS's current sensing product line, designed specifically to accelerate development of isolated current measurement in cost-sensitive, space-constrained applications where optocoupler replacement is required.

FAQ

What is the maximum continuous primary current the EVCS1806-S-3-40-00A can safely handle?

The board is rated for ±40 A primary current per its target device MCS1806GS-3-40 specification. The screw terminals (Keystone 8191K-ND) are rated for 15 A continuous; however, the board layout uses wide copper traces to sustain higher peak currents. For sustained ±40 A operation, external heatsinking or forced airflow is recommended per MPS application note AN-123.

Does the EVCS1806-S-3-40-00A support both AC and DC current measurement?

Yes - the underlying MCS1806GS-3-40 sensor uses a linear Hall-effect architecture with zero-drift calibration, enabling accurate measurement of both DC and AC currents up to 100 kHz bandwidth when C4 is omitted. Output voltage scales linearly with instantaneous current magnitude and polarity.

How is isolation achieved on this evaluation board?

Isolation is implemented entirely within the MCS1806GS-3-40 IC (SOIC-8 package), which integrates a monolithic Hall sensor, signal conditioning, and isolation barrier. The board maintains >8 mm creepage/clearance between primary conductor pads (IP+, IP−) and low-voltage pins (VCC, GND, VOUT), meeting IEC 60950-1 reinforced insulation requirements.

Can I change the supply voltage from 3.3 V to 5 V on this board?

No - the EVCS1806-S-3-40-00A is hardware-configured for 3.3 V operation only. The "-3" in the part number denotes fixed 3.3 V VCC compatibility. To evaluate at 5 V, use EVCS1806-S-5-40-00A, which has different internal biasing and sensitivity (50 mV/A).

What is the role of capacitor C4 on the board?

C4 is an unpopulated 0805 footprint placed in series with the FILT pin to adjust sensor bandwidth. Installing a capacitor here forms a low-pass filter: larger values reduce bandwidth and output ripple noise; omitting C4 maximizes bandwidth (~100 kHz). Default configuration (C4 open) delivers full sensor bandwidth.

Is there a reference design or layout guide included with this board?

Yes - the official EVCS1806-S-X-Y-00A Rev. 1.0 documentation includes full schematic (Figure 1), top/bottom PCB layer drawings (Figures 2–4), BOM with manufacturer part numbers, and test waveforms. All files are available for download from Monolithic Power Systems' website under product page MCS1806.