Diodes Incorporated ZXCT180B4W5-7

Overview

ZXCT180B4W5-7 from Diodes Incorporated is a unidirectional current shunt monitor optimized for high-side and low-side sensing in automotive and industrial power systems. It delivers 200V/V fixed gain, ±1% max gain error over −40°C to +125°C, 400μV max input offset voltage, 400kHz small-signal bandwidth (at 20V/V), and operates from 2.7V to 5.5V supply while measuring shunt voltages across −0.3V to 26V common-mode range - enabling precise motor fault detection in 12V/24V battery-fed circuits.

For engineers reviewing the ZXCT180B4W5-7 datasheet, ZXCT180B4W5-7 pinout, ZXCT180B4W5-7 application, or ZXCT180B4W5-7 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, rail-to-rail output swing, 2V/μs slew rate for fast transient response, and SOT25 package compatibility with space-constrained PCB layouts in motor control and solar inverter designs.

Technical Context

The ZXCT180B4W5-7 implements a precision current-sense amplifier topology that isolates measurement circuitry from high common-mode voltages using internal high-voltage input stages. Its differential input architecture achieves 84–110dB CMRR and supports bidirectional layout flexibility via Pinout B (OUT on Pin 4).

It features four factory-set gain options; this variant uses Pinout B with Gain = 200V/V, resulting in 85kHz bandwidth (C_L = 10pF), ±400μV max V_OS at 12V V_CM, and 1.0μV/°C drift - all specified across −40°C to +125°C for automotive-grade reliability.

Key Specifications

Pinout & Package

Package: 5-pin SOT25 (3.0mm × 1.6mm × 1.1mm body, 0.95mm height), RoHS-compliant, matte tin-plated leads, MSL Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and TSC2100IDR, ZXCT180B4W5-7 provides the highest fixed gain (200V/V) in an AEC-Q100-qualified SOT25 package with guaranteed ±1% gain error over temperature - making it optimal for space-constrained, high-accuracy automotive motor control where external components must be minimized and fault response time is critical.

Availability

ZXCT180B4W5-7 is available at Aetrix Electronics and suitable for motor control, automotive lighting, solar inverter DC-link monitoring, and industrial power supply overcurrent protection requiring stable component supply, AEC-Q100 compliance, and SOT25 footprint consistency.

Supply support for ZXCT180B4W5-7 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 power management, signal integrity, and protection solutions for automotive, industrial, and consumer markets.

The ZXCT180 series belongs to Diodes' precision current-sensing amplifier product line, engineered specifically for high-common-mode, low-power, AEC-Q100-compliant applications in motor drives, battery management, and power conversion systems.

FAQ

What is the difference between ZXCT180B4W5-7 and ZXCT180A4W5-7?

ZXCT180B4W5-7 uses Pinout B (OUT on Pin 4), while ZXCT180A4W5-7 uses Pinout A (OUT on Pin 1). Both deliver identical 200V/V gain, electrical specs, and temperature performance. The pinout difference enables flexible PCB routing: Pinout B places OUT adjacent to IN− and GND, simplifying low-impedance analog trace layout in high-noise motor drive environments.

Can ZXCT180B4W5-7 measure bidirectional current?

No. ZXCT180B4W5-7 is strictly unidirectional: it amplifies only positive differential voltage (IN+ > IN−) and outputs a voltage referenced to GND. For bidirectional sensing, Diodes offers the ZXCT181 series, which includes internal reference and dual-supply capability to resolve current flow direction.

What is the maximum capacitive load the OUT pin can drive?

The ZXCT180B4W5-7 output is stable with up to 1nF capacitive load, per datasheet specification. Driving larger loads (e.g., long traces or ADC input capacitance >1nF) requires an external unity-gain buffer to prevent peaking or oscillation, especially at higher gains like 200V/V where bandwidth drops to 85kHz.

Does ZXCT180B4W5-7 require external resistors for gain setting?

No. Gain is factory-configured and fixed at 200V/V for this variant; no external resistors are needed. The device achieves gain through internal laser-trimmed thin-film resistors, ensuring ±1% accuracy over temperature without user adjustment or layout dependencies.