Diodes Incorporated ZXCT213ADW-7

Overview

ZXCT213ADW-7 from Diodes Incorporated is a zero-drift, high-precision current-shunt monitor IC with 50V/V fixed gain, designed for unidirectional or bidirectional current sensing in high-common-mode-voltage systems up to 26V. It supports 10mV full-scale shunt voltage drop, delivers ±100μV max input offset voltage over temperature, and operates from 2.7V to 26V supply with 100μA max quiescent current - enabling accurate, low-power current monitoring in server power supplies and battery management systems.

For engineers reviewing the ZXCT213ADW-7 datasheet, ZXCT213ADW-7 pinout, ZXCT213ADW-7 application, or ZXCT213ADW-7 equivalent, this device is selected for precision DC current measurement where low offset drift (0.5μV/°C), rail-to-rail output swing, and wide common-mode range (-0.3V to 26V) are critical in industrial and computing power rails.

Technical Context

The ZXCT213ADW-7 employs a zero-drift chopper-stabilized architecture to achieve ±100μV max offset voltage and 10ppm/°C max gain drift across -40°C to +125°C. Its differential input stage rejects common-mode voltages far exceeding the 2.7V–26V supply rail, enabling direct sensing on 26V bus lines while powered from low-voltage rails.

It features rail-to-rail output capable of driving 10kΩ loads, 80kHz bandwidth (C_L = 10pF), and integrated bias circuitry supporting both high-side and low-side configurations. The REF pin allows external voltage biasing for bidirectional operation, with strict requirement for low-impedance connection to avoid error.

Key Specifications

Pinout & Package

SOT363-6 package: ultra-compact, surface-mount, thermally enhanced plastic package with exposed pad (not electrically connected), rated for 228°C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and MAX40056ATA+T, the ZXCT213ADW-7 offers optimal balance of ultra-low IQ (100μA), SOT363 compactness, and sufficient 80kHz bandwidth for server/BMS use - making it preferred where board area and standby power are constrained but 0.2% accuracy suffices.

Availability

ZXCT213ADW-7 is available at Aetrix Electronics and suitable for server power rail monitoring, battery management systems, industrial PLC analog input modules, and high-performance GPU power delivery requiring stable component supply and long-term lifecycle continuity.

Supply support for ZXCT213ADW-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 company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The ZXCT21x series targets high-accuracy current sensing in industrial, computing, and automotive power systems - emphasizing zero-drift performance, wide common-mode tolerance, and low-power operation across extended temperature ranges.

FAQ

What is the maximum shunt voltage the ZXCT213ADW-7 can accurately measure?

The ZXCT213ADW-7 is optimized for 10mV full-scale shunt voltage drop, delivering ±0.2% gain error and ±100μV offset error at that level. It supports differential inputs up to ±26V, but accuracy degrades beyond 10mV due to nonlinearity (±0.01% max). For higher shunt drops, use lower-gain variants like ZXCT214 (100V/V) or ZXCT215 (75V/V).

Can the ZXCT213ADW-7 be used for bidirectional current sensing?

Yes - configure the REF pin with a stable mid-supply voltage (e.g., V+/2) to establish a zero-current output baseline. The rail-to-rail output swings symmetrically around REF, enabling ±500mV output for ±10mV shunt drops. Ensure REF is driven by ≤100Ω impedance to prevent gain/offset errors from input bias current mismatch.

What layout practices maximize accuracy for the ZXCT213ADW-7?

Route IN+ and IN− traces as matched-length, tightly coupled differential pair over solid ground plane; place shunt resistor adjacent to device pins; use separate ground vias for GND and power return; mount 100nF ceramic bypass capacitor between V+ and GND within 2mm of pins 2/3; avoid routing noisy signals near IN+/IN− or REF.

How does the ZXCT213ADW-7 handle common-mode transients?

Its 95dB CMRR and internal ESD protection (±5kV HBM) suppress slow transients, but fast dv/dt edges (>10V/ns) on high-inductance shunts induce errors via input capacitance imbalance. Add matched ≤10Ω resistors and 0.01–0.1μF capacitors at IN+/IN− per Figure 21 to form low-pass filter matching shunt L/R time constant - verified to maintain <0.5% error under 50A/μs step loads.