Diodes Incorporated ZXCT180B1W5-7

Overview

ZXCT180B1W5-7 from Diodes Incorporated is a unidirectional current shunt monitor optimized for high-side and low-side sensing in automotive and industrial power systems, featuring 20V/V fixed gain, ±1% max gain error over −40°C to +125°C, 400kHz small-signal bandwidth, and operation from 2.7V to 5.5V supply with 26V common-mode input range. It delivers rail-to-rail output voltage proportional to load current for real-time fault detection in motor control and power management.

For engineers reviewing the ZXCT180B1W5-7 datasheet, ZXCT180B1W5-7 pinout, ZXCT180B1W5-7 application, or ZXCT180B1W5-7 equivalent, this device supports AEC-Q100 Grade 1 qualification, offers two pinout variants (A/B) for layout flexibility, and enables precise current measurement across shunts at voltages up to 26V - independent of supply - with sub-μV/°C offset drift and <370μA quiescent current.

Technical Context

The ZXCT180B1W5-7 implements a precision current-sense amplifier topology with input stage capable of measuring differential voltages across shunts while rejecting common-mode signals up to 26V - exceeding its 5.5V max supply. Its internal resistor network sets fixed 20V/V gain without external components, and rail-to-rail output drives ADC inputs directly.

It features a 400kHz small-signal bandwidth and 2V/μs slew rate, enabling fast transient response for overcurrent detection in motor drives and solar inverters. Input bias currents remain below ±75μA across full common-mode range, and CMRR exceeds 84dB at 26V common-mode voltage.

Key Specifications

Pinout & Package

Package: 5-pin SOT25 (3.0mm × 1.6mm × 1.1mm), RoHS-compliant, halogen-free, AEC-Q100 Grade 1 qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX4080TASA+, the ZXCT180B1W5-7 provides superior automotive qualification, lower quiescent current, and higher CMRR at 26V common-mode - making it optimal for space-constrained, always-on, AEC-Q100–compliant current sensing where fixed 20V/V gain is acceptable.

Availability

ZXCT180B1W5-7 is available at Aetrix Electronics and suitable for motor control, power management, and fault current detection requiring stable component supply, automotive-grade reliability, and compact SOT25 packaging.

Supply support for ZXCT180B1W5-7 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, AEC-Q100–qualified products for automotive, industrial, and computing markets.

The ZXCT180 series targets cost-effective, high-precision current sensing in space-constrained automotive and industrial power systems - emphasizing wide common-mode range, low IQ, and robust thermal performance from −40°C to +125°C.

FAQ

What is the difference between ZXCT180B1W5-7 and ZXCT180A1W5-7?

ZXCT180B1W5-7 uses Pinout B (OUT on Pin 4), while ZXCT180A1W5-7 uses Pinout A (OUT on Pin 1). Both share identical electrical specifications - 20V/V gain, ±1% gain error, 400kHz bandwidth, and AEC-Q100 Grade 1 rating - but differ only in output pin location to optimize PCB routing for high-side or low-side shunt placement.

Can ZXCT180B1W5-7 measure current in high-side configurations with 24V bus voltage?

Yes. The device supports common-mode input voltages from −0.3V to 26V, independent of its 2.7V–5.5V supply voltage. When placed on a 24V bus with a shunt between VIN+ and VIN−, it accurately amplifies the mV-level shunt voltage by 20× without level-shifting circuitry or external biasing.

Does ZXCT180B1W5-7 require an external bypass capacitor?

Yes. A 0.1μF ceramic capacitor must be placed between VS and GND, as close as possible to the SOT25 package pins. This stabilizes the internal reference and prevents oscillation, especially under high-frequency load transients - omission risks output instability and degraded AC performance.

Is ZXCT180B1W5-7 compatible with 3.3V microcontroller ADC inputs?

Yes. With rail-to-rail output swing (GND to VS − 0.03V) and 2.7V–5.5V supply range, it delivers 0–3.27V output when powered from 3.3V - fully compatible with 3.3V ADC references. Its ±400μV offset introduces <20mA error on a 10mΩ shunt, well within typical 12-bit ADC resolution requirements.