Diodes Incorporated ZXCT1110QW5-7

Overview

ZXCT1110QW5-7 from Diodes Incorporated is an AEC-Q100 Grade 1 qualified high-side unipolar current sense monitor in SOT25-5 package. It delivers 4mA/V transconductance with ±1.8% gain error, 40µA output offset at 10mV VSENSE, and operates over 2.5V–36V common-mode input range. Designed for automotive battery management and overcurrent protection, it eliminates ground-plane disruption while drawing only 3µA quiescent current.

For engineers reviewing the ZXCT1110QW5-7 datasheet, ZXCT1110QW5-7 pinout, ZXCT1110QW5-7 application, or ZXCT1110QW5-7 equivalent, key selection criteria include its separate GND pin enabling reduced output offset error, linear operation from 10mV to 500mV VSENSE, and guaranteed performance across −40°C to +125°C ambient temperature.

Technical Context

The ZXCT1110QW5-7 uses a high-side sensing architecture with dedicated GND pin to isolate substrate noise and minimize output current offset drift. Its internal voltage-to-current converter provides precise 4mA/V transconductance with <±1.8% error over 10mV–150mV VSENSE and full-range temperature coefficient of 265ppm/°C.

It supports line-powered operation without external supply, accepting common-mode voltages up to 36V on S+ and S− while maintaining 0.1–0.4µA/V common-mode rejection. The device achieves 0.65MHz small-signal bandwidth with 2.5kΩ RGAIN and exhibits <±2.62% total output current error at 100mV VSENSE.

Key Specifications

Pinout & Package

SOT25-5 surface-mount package with exposed pad for thermal dissipation; RoHS-compliant, halogen-free, lead-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current sensing applications.

Compared with MAX4080TAUA+ and INA240A1QDRQ1, the ZXCT1110QW5-7 offers lowest power consumption (3µA), true line-powered operation, and smallest SOT25 footprint-making it optimal for space-constrained, always-on automotive subsystems where unidirectional high-side sensing suffices.

Availability

ZXCT1110QW5-7 is available at Aetrix Electronics and suitable for automotive battery management, EV onboard charger protection, and 48V mild hybrid power distribution requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZXCT1110QW5-7 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

Diodes Incorporated is a global semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets.

The ZXCT11xxQ product line delivers micropower, high-side current monitors optimized for AEC-Q100-compliant automotive subsystems where ground-plane integrity and ultra-low quiescent current are critical design constraints.

FAQ

What is the minimum sense voltage for guaranteed linearity?

The ZXCT1110QW5-7 operates linearly from 10mV to 500mV VSENSE. Below 10mV, output current may fall to zero due to internal offset effects, making 10mV the practical lower limit for accurate measurement. At 10mV, output is 40µA ±4µA, and linearity improves progressively up to 500mV.

Can ZXCT1110QW5-7 be used in low-voltage systems below 2.5V?

No. The absolute minimum common-mode input voltage is 2.5V per datasheet specifications. Attempting operation below this risks violating recommended operating conditions and may result in undefined output behavior or increased offset error. Systems with sub-2.5V rails require alternative current-sense architectures.

How does the NC pin affect PCB layout?

Pin 5 (NC) must remain unconnected and unstubbed on the PCB. Routing traces to or placing vias near this pin can introduce parasitic capacitance that degrades high-frequency response and increases susceptibility to EMI. Maintain ≥0.2mm clearance and avoid copper pours beneath it per Diodes' layout guidelines.

Is external gain resistor (RGAIN) mandatory?

Yes. RGAIN converts the device's output current into a measurable voltage (VOUT = IOUT × RGAIN). Without it, the current output cannot interface with standard voltage-input circuits like comparators or ADCs. Typical values range from 1kΩ to 20kΩ depending on desired VOUT scale and noise immunity requirements.