Diodes Incorporated ZXCT180QB4W5-7

Overview

ZXCT180QB4W5-7 from Diodes Incorporated is an AEC-Q100 Grade 1 automotive current shunt monitor supporting uni-directional high-side and low-side sensing with 200V/V fixed gain, 400μV max input offset voltage over temperature, −0.3V to 26V common-mode range, and 400kHz small-signal bandwidth at 20V/V (85kHz at 200V/V). It operates from 2.7V–5.5V supply and delivers rail-to-rail output for motor control fault detection in 12V/24V vehicle systems.

For engineers reviewing the ZXCT180QB4W5-7 datasheet, ZXCT180QB4W5-7 pinout, ZXCT180QB4W5-7 application, or ZXCT180QB4W5-7 equivalent, this part enables precise current measurement in high-common-mode automotive subsystems where supply voltage is decoupled from bus voltage - critical for e-pump monitoring, valve actuation, and battery charging safety circuits.

Technical Context

The ZXCT180QB4W5-7 implements a precision current-sense amplifier topology with internal matched resistor networks enabling fixed-gain operation without external components. Its input stage operates independently of VS, allowing accurate sensing across −0.3V to 26V common-mode while powered only by 2.7V–5.5V.

Pinout B (OUT on Pin 4) provides layout flexibility for PCB routing in space-constrained automotive modules. The device achieves 84dB minimum CMRR and 110dB typical CMRR at 12V common-mode, with PSRR of ±40μV/V over full supply range - essential for noise-immune operation in engine bay or chassis environments.

Key Specifications

Pinout & Package

Package: 5-pin SOT25 (3.0mm × 2.8mm × 1.3mm), RoHS-compliant, halogen-free, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current sensing amplifier applications.

Compared with INA240A1QDRQ1 and MAX40056ATA+T, the ZXCT180QB4W5-7 uniquely combines AEC-Q100 Grade 1 qualification, 200V/V gain, and −0.3V to 26V common-mode range in a single SOT25 package - making it the only drop-in solution for high-accuracy, high-common-mode automotive current monitoring without design compromises.

Availability

ZXCT180QB4W5-7 is available at Aetrix Electronics and suitable for vehicle motor controls, body control modules, and on-board charger protection requiring stable component supply across automotive production lifecycles.

Supply support for ZXCT180QB4W5-7 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.

The ZXCT180Q series was designed specifically for AEC-Q100-compliant current sensing in 12V/24V/48V automotive subsystems - prioritizing wide common-mode operation, low quiescent current, and pinout flexibility for PCB layout optimization.

FAQ

What is the difference between Pinout A and Pinout B versions of the ZXCT180Q?

Pinout A places the OUT signal on Pin 1; Pinout B places OUT on Pin 4. Both share identical electrical performance, but Pinout B (used in ZXCT180QB4W5-7) improves PCB routing in high-density layouts where output traces must avoid shunt resistor pads. The choice does not affect gain, bandwidth, or accuracy.

Can ZXCT180QB4W5-7 measure current in high-side configurations with 24V battery systems?

Yes. Its −0.3V to 26V common-mode input range allows direct connection across shunts placed between battery positive and load, even when powered by a separate 3.3V or 5V rail. The input stage operates independently of VS, enabling true high-side sensing without level shifters or isolated supplies.

How does the 200V/V gain option impact bandwidth and noise performance?

At 200V/V gain, the small-signal bandwidth is 85kHz (vs. 400kHz at 20V/V), and input-referred voltage noise is 40nV/√Hz. This trade-off optimizes resolution for low-voltage shunt drops (e.g., 5mV full-scale), making it ideal for high-current, low-resistance sensing where bandwidth requirements are below 100kHz.

Is external compensation required for stable operation of ZXCT180QB4W5-7?

No. The device is internally compensated for unity-gain stability. A 0.1μF ceramic bypass capacitor placed between VS and GND pins (as close as possible) is the only required external component. Additional capacitance may be added for noisy supply rails, but no feedback network or compensation components are needed.