Monolithic Power Systems Inc. EVCS1801-S-25-00A

Overview

EVCS1801-S-25-00A from Monolithic Power Systems is a linear Hall-effect current sensor evaluation board designed to demonstrate the MCS180XGS-25 current sensor IC, supporting ±25 A primary current sensing at 5 V supply, with 80 mV/A typical sensitivity, differential Hall array for stray-field rejection, and galvanic isolation between primary conductor (IP+/IP−) and signal pins (VOUT, VCC, GND).

For engineers reviewing the EVCS1801-S-25-00A datasheet, EVCS1801-S-25-00A pinout, EVCS1801-S-25-00A application, or EVCS1801-S-25-00A equivalent, this board enables rapid validation of DC/AC current measurement accuracy, bandwidth response (up to 100 kHz), output linearity, and isolation integrity in motor control, power supply monitoring, and over-current protection circuits.

Technical Context

The EVCS1801-S-25-00A implements the MCS180XGS-25 IC in SOIC-8 package, configured with fixed ±25 A full-scale range and 5 V supply. Its differential Hall array rejects external magnetic interference, while internal 0.9 mΩ conductor resistance minimizes power loss and thermal drift under load.

Output voltage follows VOUT = 0.5 × VCC + Sens × IP (Sens = 80 mV/A typ), enabling ratiometric operation. Bandwidth is adjustable via external capacitor C4; default configuration supports ≥100 kHz small-signal response with 4 μs rise time.

Key Specifications

Availability

EVCS1801-S-25-00A is available at Aetrix Electronics and suitable for motor control validation, switch-mode power supply current monitoring, and over-current fault protection prototyping requiring stable component supply and traceable evaluation hardware.

Supply support for EVCS1801-S-25-00A 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.

The MCS180X product line delivers isolated, contactless current sensing for industrial and automotive applications where safety, accuracy, and magnetic immunity are critical-designed specifically to replace optocouplers and shunt-based solutions.

FAQ

What is the primary purpose of the EVCS1801-S-25-00A evaluation board?

This board is a ready-to-use platform for evaluating the MCS180XGS-25 linear Hall-effect current sensor IC. It provides accessible test points for VCC, GND, VOUT, IP+, and IP−, pre-mounted decoupling capacitors (C1, C2), and configurable filter capacitor C4 to validate accuracy, bandwidth, linearity, and isolation performance under real-world current conditions up to ±25 A.

Can the EVCS1801-S-25-00A operate with 3.3 V supply?

No - this specific variant (EVCS1801-S-25-00A) is optimized for 5 V supply and the MCS180XGS-25 IC. The "1" in the part number denotes 5 V operation; 3.3 V variants (e.g., EVCS1800-S-25-00A) use different IC versions with adjusted sensitivity and biasing. Using 3.3 V on this board may result in out-of-spec output offset and reduced dynamic range.

How is galvanic isolation achieved on this evaluation board?

Isolation is inherent to the MCS180XGS-25 IC itself - its SOIC-8 package integrates a monolithic Hall sensor die separated by internal insulation from the primary copper conductor path (IP+/IP− pins). No external transformers or optocouplers are used. The board maintains >2.5 kVRMS isolation rating between primary and secondary sides, verified per IEC 60747-17.

What role does capacitor C4 play in system performance?

C4 is an external filter capacitor connected between FILT and GND that sets the sensor's signal bandwidth. Increasing C4 capacitance reduces bandwidth and improves noise immunity; decreasing it raises bandwidth toward the IC's native 100 kHz limit. Default omission (open circuit) yields maximum bandwidth and fastest step response (4 μs rise time), as confirmed in MPS test reports.

Does this board support AC current measurement?

Yes - the MCS180XGS-25 IC and EVCS1801-S-25-00A board support true AC/DC current sensing. Output voltage centers at VCC/2 (2.5 V at 5 V supply) and swings symmetrically with bidirectional current flow (±25 A), enabling accurate zero-crossing detection and RMS measurement when paired with appropriate signal conditioning and sampling circuitry.

Are screw terminals included with the board?

Yes - the bill of materials specifies two 4-pin Philips-style screw terminals (Keystone 8191K-ND) pre-installed for IP+ and IP− connections. These accept wire sizes from 22–14 AWG and provide secure, low-resistance mechanical attachment to the primary current path without soldering.