Diodes Incorporated ZXCT214BDW-7

Overview

ZXCT214BDW-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 100V/V fixed gain, designed for unidirectional or bidirectional current monitoring across shunt resistors at common-mode voltages from –0.3V to 26V. It delivers ±60μV max offset voltage, ±0.8% max gain error over temperature, 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 ZXCT214BDW-7 datasheet, ZXCT214BDW-7 pinout, ZXCT214BDW-7 application, or ZXCT214BDW-7 equivalent, this device supports high-side/low-side sensing with minimal power loss, operates from 2.7V–26V supply, maintains 10ppm/°C gain drift, and integrates into ADC-based current monitoring without external trimming.

Technical Context

The ZXCT214BDW-7 employs a zero-drift chopper-stabilized architecture with post-trim calibration to achieve ±60μV input offset voltage and 0.1μV/°C typical offset drift across –40°C to +125°C. Its differential input stage rejects common-mode signals up to 26V while operating from a supply as low as 2.7V - decoupling measurement accuracy from rail voltage constraints.

It features rail-to-rail output drive capability (within 50mV of V+ and 5mV of GND), 30kHz bandwidth (C_L = 10pF), and 25nV/√Hz input voltage noise density. The REF pin allows flexible biasing for bidirectional operation, and internal gain-setting resistors eliminate external component dependency for the 100V/V transfer function.

Key Specifications

Pinout & Package

SOT363-6 package: 2.1mm × 2.0mm × 1.0mm body, 0.65mm pitch, thermally enhanced exposed pad (pin 7 NC, pin 1 REF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and MAX4080TASA+, the ZXCT214BDW-7 uniquely balances 26V CMR, 100V/V precision gain, and REF-configurable bidirectionality in a 2.1mm × 2.0mm package - making it optimal for compact, multi-rail industrial and computing power monitors where supply headroom and layout area are constrained.

Availability

ZXCT214BDW-7 is available at Aetrix Electronics and suitable for server power supply monitoring, battery management systems, industrial PLC I/O modules, and high-performance GPU power delivery requiring stable component supply across extended temperature and voltage ranges.

Supply support for ZXCT214BDW-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 ICs for power management, signal integrity, and connectivity applications.

The ZXCT21x product line targets high-accuracy current sensing in power-constrained, high-CMR environments - delivering zero-drift performance in compact packages for datacenter, automotive, and industrial control systems.

FAQ

What is the maximum shunt voltage the ZXCT214BDW-7 can accurately measure?

The ZXCT214BDW-7 supports full-scale shunt drops as low as 10mV due to its ±60μV offset voltage and 100V/V gain. At 10mV input, it produces a 1.0V output with ≤0.6% total error (offset + gain error). For higher shunt voltages, the device remains linear up to ±26V common-mode, but output swing is limited to V+ – 0.05V and GND + 0.005V - constraining usable differential input to ~25mV at 3.3V supply.

Can the ZXCT214BDW-7 be used for bidirectional current sensing?

Yes - by applying a stable bias voltage (e.g., V+/2) to the REF pin, the OUT pin swings symmetrically around that reference, enabling positive/negative current detection. This configuration requires low-impedance REF drive (<1kΩ) and matching of IN+/IN– trace impedances to preserve CMRR. The device does not include internal level-shifting; external circuitry sets the bidirectional range.

Does the ZXCT214BDW-7 require external gain-setting resistors?

No - the 100V/V gain is fully integrated via laser-trimmed internal resistors. No external components are needed to set gain, eliminating resistor matching errors and board space. The SOT363 package contains all gain-setting elements; only bypass capacitors (≥100nF) and optional input RC filters (<10Ω series + matched capacitor) are recommended for stability and noise rejection.

How does the zero-drift architecture improve long-term measurement stability?

The chopper-stabilized zero-drift design actively corrects input offset voltage in real time, reducing drift to 0.1μV/°C and limiting long-term aging to <1μV over 1000 hours at +125°C. This eliminates baseline walk in continuous monitoring applications like battery coulomb counting or server power telemetry - maintaining sub-0.01% measurement consistency without periodic calibration.