Monolithic Power Systems Inc. MCS1823GQTE-335URN-Z

Overview

MCS1823GQTE-335URN-Z from Monolithic Power Systems is a unidirectional, 3.3V-supplied linear Hall-effect current sensor IC with integrated over-current detection (OCD), rated for 0–35A primary current, 75.4 mV/A sensitivity, ±2.5% total output error, and 120kHz bandwidth. It uses a differential Hall array to reject stray magnetic fields and features 0.6mΩ internal conductor resistance for minimal power loss in motor control and power supply monitoring applications.

For engineers reviewing the MCS1823GQTE-335URN-Z datasheet, MCS1823GQTE-335URN-Z pinout, MCS1823GQTE-335URN-Z application, or MCS1823GQTE-335URN-Z equivalent, key selection considerations include its unidirectional 35A range, ratiometric/absolute VOUT option, 1µs OCD response time, TQFN-12 (3mm×3mm) package footprint, and factory-trimmed accuracy across –40°C to +125°C junction temperature.

Technical Context

The MCS1823GQTE-335URN-Z implements a spinning-current Hall plate architecture with dual magnetic coupling factors (PMCF1 = 1.15 mT/A, PMCF2 = 0.25 mT/A) to achieve low offset drift and immunity to external gradient fields. Its dynamic offset cancellation and POR-regulated internal supply ensure stable operation under fast transients.

It integrates a dedicated open-drain /OCD output with user-configurable threshold (via external pull-up resistor) and 1µs response time, while the analog VOUT provides ratiometric or absolute scaling - selectable at factory - enabling direct interfacing with 3.3V ADCs or microcontrollers without external gain stages.

Key Specifications

Pinout & Package

TQFN-12 (3mm × 3mm, 0.5mm pitch) with exposed thermal pad; ultra-compact footprint ideal for space-constrained power modules and automotive ECUs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear Hall-effect current sensing applications.

Compared with ACS724LLCTR-35AB-T and TLE4971-5U, the MCS1823GQTE-335URN-Z uniquely combines unidirectional 35A sensing, 1µs OCD response, and ultra-small TQFN-12 packaging - making it optimal for space- and speed-critical analog protection loops where digital overhead is undesirable.

Availability

MCS1823GQTE-335URN-Z is available at Aetrix Electronics and suitable for motor control, switch-mode power supplies, and over-current fault protection requiring stable component supply, consistent parametric performance across temperature, and long-term lifecycle support.

Supply support for MCS1823GQTE-335URN-Z 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, with design expertise in DC/DC converters, LED drivers, and precision analog sensors.

The MCS1823 product line targets compact, high-efficiency current sensing in automotive, industrial, and computing power systems - emphasizing magnetic immunity, thermal robustness, and integration of protection features like OCD in minimal footprint.

FAQ

What is the maximum continuous current the MCS1823GQTE-335URN-Z can measure?

The device is rated for 0–35A unidirectional primary current (IPMAX = 35A). Its 0.6mΩ internal conductor allows continuous operation at 35A with <0.75W dissipation. Beyond 35A, VOUT remains proportional but nonlinearity increases beyond ±2.5% specification - not recommended for precision measurement.

Does the MCS1823GQTE-335URN-Z require external calibration?

No. It is factory-trimmed for sensitivity and zero-current offset, delivering ±2.5% total output error over –40°C to +125°C without end-of-line calibration. System-level calibration may still be applied for highest accuracy, but is not required for most motor control or protection applications.

How is the over-current detection threshold configured?

The /OCD pin is open-drain and requires an external pull-up resistor (10kΩ–500kΩ) to VCC. Threshold is set by resistor value: lower resistance yields higher OCD trip point (up to 240% of IPMAX), higher resistance lowers it (down to 50%). No programming or configuration pins are needed.

Is the VOUT output ratiometric or absolute by default?

The MCS1823GQTE-335URN-Z is shipped with ratiometric VOUT (VOUT(Q) = 0.1 × VCC at IP = 0A). Absolute output mode is available as a custom order variant (e.g., MCS1823GQTE-335ARN-Z); the part number suffix "U" indicates unidirectional, "R" indicates ratiometric output.

What is the thermal performance of the TQFN-12 package?

The TQFN-12 (3mm×3mm) package has a junction-to-board thermal resistance (θJB) of 25°C/W and junction-to-ambient (θJA) of 120°C/W (with 2-layer board, 1-in² copper). At 35A, junction temperature rise is ~19°C above ambient - well within the –40°C to +125°C operating range.

Can the MCS1823GQTE-335URN-Z replace shunt-based current sensing?

Yes - it replaces shunt resistors and associated op-amp circuitry in applications requiring isolation, low power loss, and immunity to EMI. Unlike shunts, it provides inherent galvanic isolation (VIOWM = 100V) and eliminates I²R heating, though it does not provide reinforced isolation per IEC 60747-17.

What is the minimum recommended bypass capacitance on VCC?

A 0.1µF ceramic capacitor placed between VCC and GND, as close as possible to pins 12 and 5, is required. For improved high-frequency noise rejection in noisy environments, a parallel 1µF X7R capacitor is recommended - both must be low-ESR types with short, wide traces.