Diodes Incorporated ZXCT180A3W5-7

Overview

ZXCT180A3W5-7 from Diodes Incorporated is a unidirectional current shunt monitor optimized for high-accuracy, wide common-mode (–0.3 V to 26 V) sensing in low-side and high-side configurations. It delivers 100 V/V fixed gain, ±1% max gain error over –40°C to +125°C, 400 kHz small-signal bandwidth, rail-to-rail output swing, and 370 µA max quiescent current - enabling precise motor fault detection and solar inverter current monitoring.

For engineers reviewing the ZXCT180A3W5-7 datasheet, ZXCT180A3W5-7 pinout, ZXCT180A3W5-7 application, or ZXCT180A3W5-7 equivalent, key selection criteria include common-mode voltage tolerance beyond supply rails, temperature-stable offset (<±400 µV), gain-select flexibility across four versions, and AEC-Q100 Grade 1 qualification for automotive-grade reliability.

Technical Context

The ZXCT180A3W5-7 employs a precision current-sense amplifier topology that separates input stage biasing from supply rails, allowing accurate measurement of shunt voltage drops at common-mode voltages up to 26 V while powered only by 2.7–5.5 V. Its internal resistor network sets fixed 100 V/V gain without external components.

It features a 2 V/µs slew rate and 400 kHz bandwidth (at G = 100), enabling fast response to transient load currents. Input offset drift is limited to 1 µV/°C, and CMRR exceeds 84 dB across –40°C to +125°C - critical for noise-immune operation in noisy power systems.

Key Specifications

Pinout & Package

Package: 5-pin SOT25 (3.0 × 1.6 × 1.1 mm, moisture sensitivity level 1). Compact surface-mount footprint suitable for space-constrained PCB layouts in motor drivers and power converters.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3IDR and MAX4080TASA+, ZXCT180A3W5-7 offers superior common-mode tolerance (26 V vs. 24 V), AEC-Q100 Grade 1 certification, and zero external components for gain setting - making it optimal for cost-sensitive, space-constrained automotive and industrial current-sensing nodes where fixed 100× gain suffices.

Availability

ZXCT180A3W5-7 is available at Aetrix Electronics and suitable for motor control systems, solar inverter DC-link monitoring, and automotive body control modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for ZXCT180A3W5-7 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-sense amplifier product line, engineered specifically for cost-effective, high-accuracy shunt-based current monitoring in harsh environments with wide common-mode voltage requirements.

FAQ

What is the difference between ZXCT180A3W5-7 and ZXCT180B3W5-7?

ZXCT180A3W5-7 has the OUT pin on Pin 1 (SOT25 Pinout A), while ZXCT180B3W5-7 places OUT on Pin 4 (Pinout B). Both deliver identical 100 V/V gain, electrical performance, and temperature specs. The pinout variation provides layout flexibility: Pinout A suits top-layer routing to adjacent MCU ADC pins; Pinout B optimizes bottom-layer fanout in dense power sections.

Can ZXCT180A3W5-7 measure bidirectional current?

No. ZXCT180A3W5-7 is strictly unidirectional: it measures current flow in one direction only (from IN+ to IN–). Its output voltage increases linearly with positive shunt voltage (IN+ > IN–) and saturates near GND for reverse polarity. For bidirectional sensing, Diodes' ZXCT108 or TI's INA226 would be appropriate alternatives.

What is the minimum shunt resistance compatible with ZXCT180A3W5-7 at 5 V supply?

With 100 V/V gain and rail-to-rail output (0.005 V to 4.97 V), the minimum measurable shunt voltage is ~5 mV. At 5 V supply and 10 A max load, minimum shunt resistance is 0.5 mΩ (5 mV / 10 A). Practical minimum is 1 mΩ to maintain SNR above 60 dB with 40 nV/√Hz input noise - verified per DS46641 Figure 11.

Does ZXCT180A3W5-7 require an external reference voltage?

No. ZXCT180A3W5-7 uses an internal precision reference and does not require an external REF pin connection. Its output is fully ratiometric to VS, and internal biasing eliminates need for external voltage references or trimming components - confirmed in Pin Descriptions and Typical Applications Circuit (Figure 13) of DS46641 Rev. 1-2.