Diodes Incorporated ZXCT213CDW-7

Overview

ZXCT213CDW-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 50V/V fixed gain, designed for unidirectional or bidirectional current monitoring in high-common-mode voltage systems up to 26V. It delivers ±0.5% max gain error over temperature, ±90μV max input offset voltage, and rail-to-rail output swing - enabling accurate 10mV full-scale shunt measurements in server power supplies and battery management systems.

For engineers reviewing the ZXCT213CDW-7 datasheet, ZXCT213CDW-7 pinout, ZXCT213CDW-7 application, or ZXCT213CDW-7 equivalent, this device supports low-side and high-side sensing configurations, operates from 2.7V to 26V supply, features 100μA max quiescent current, and is validated for industrial temperature range (−40°C to +125°C) with SOT363 packaging.

Technical Context

The ZXCT213CDW-7 uses a zero-drift chopper-stabilized architecture to achieve ±90μV max input offset voltage and 10ppm/°C max gain drift across −40°C to +125°C. Its differential input stage accepts common-mode voltages from −0.3V to 26V while powered from as low as 2.7V, decoupling measurement accuracy from supply rail constraints.

It provides rail-to-rail output swing into 10kΩ loads, supports REF-biased bidirectional operation, and integrates internal gain-setting resistors for 50V/V amplification - eliminating external resistor matching errors and reducing PCB layout sensitivity to parasitic effects.

Key Specifications

Pinout & Package

Package: SOT363 (6-pin, 2.1mm × 2.0mm × 1.0mm), surface-mount, RoHS-compliant, halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX4080TASA+, the ZXCT213CDW-7 offers superior offset stability (±90μV vs. ±600μV) and lower power (100μA vs. 1.1mA), making it optimal for industrial and server applications requiring long-term accuracy at minimal quiescent load - but trades off automotive qualification and ultra-high common-mode tolerance.

Availability

ZXCT213CDW-7 is available at Aetrix Electronics and suitable for server power supplies, battery management systems, industrial PLC modules, and high-performance GPU power rails requiring stable component supply, consistent parametric performance, and long-lifecycle availability.

Supply support for ZXCT213CDW-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, with design centers across Asia, Europe, and the US, serving industrial, computing, and communications markets.

The ZXCT21x series targets high-accuracy current sensing in power-constrained, wide common-mode environments - specifically engineered for server, telecom, and industrial power systems demanding zero-drift stability and low quiescent current.

FAQ

What is the maximum shunt voltage the ZXCT213CDW-7 can accurately measure?

The ZXCT213CDW-7 is optimized for 10mV full-scale shunt drops, supporting up to 60mV with rail-to-rail output swing at 3.3V supply (OUT = 3.0V). At 50V/V gain, 60mV input yields 3.0V output - aligning with standard ADC reference voltages. Exceeding 60mV risks output saturation and nonlinearity beyond ±0.01%.

Can the ZXCT213CDW-7 be used for bidirectional current sensing?

Yes - configure the REF pin with a stable mid-supply voltage (e.g., V+/2 via resistor divider or buffer) to bias the output at 1.65V for 3.3V supply. IN+ and IN− connections remain unchanged. The device supports symmetric ±1.5V output swing around REF, enabling accurate charge/discharge current differentiation in battery applications.

How does the SOT363 package affect thermal performance in high-current applications?

The SOT363 package has RθJA = 228°C/W. At 100μA quiescent current and no load, self-heating is negligible (<0.1°C). In high-ambient environments (>85°C), thermal relief pads and 2oz copper pours reduce junction temperature rise by up to 40%, preserving ±90μV offset specification without derating.

Is external filtering required on the IN+ and IN− pins?

Input RC filters are recommended only for noisy environments (e.g., motor drives) or shunts <1mΩ. Use matched resistors ≤10Ω and capacitors sized to match shunt inductance (CF ≥ LSHUNT/(2·RS)). Unfiltered operation is standard for clean DC/low-frequency applications like server PSUs and battery monitoring.