Diodes Incorporated ZXCT212BDSJ-7

Overview

ZXCT212BDSJ-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 1000V/V fixed gain, designed for unidirectional or bidirectional current monitoring across shunt resistors at common-mode voltages up to 26V. It delivers ±30μV 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 ZXCT212BDSJ-7 datasheet, ZXCT212BDSJ-7 pinout, ZXCT212BDSJ-7 application, or ZXCT212BDSJ-7 equivalent, this device supports high-side/low-side sensing with minimal power loss, operates from 2.7V to 26V supply, and requires no external gain-setting components due to its factory-trimmed architecture.

Technical Context

The ZXCT212BDSJ-7 uses a zero-drift chopper-stabilized architecture with post-trim calibration to achieve ±30μV max input offset 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 independent of supply voltage, enabling direct sensing on 24V rails while powered from 3.3V.

It features rail-to-rail output drive into 10kΩ loads, 4kHz bandwidth (C_L = 10pF), and 25nV/√Hz input voltage noise. The REF pin allows flexible biasing for bidirectional operation, and internal ESD protection meets ±5kV HBM and ±1.5kV CDM standards.

Key Specifications

Pinout & Package

Package: U-QFN1418-10 (1.4mm × 1.8mm, 0.5mm pitch, wettable flanks).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX4080TASA+, the ZXCT212BDSJ-7 uniquely combines 1000V/V fixed gain, 26V common-mode capability at 2.7V supply, and REF-based bidirectional support - making it optimal for space-constrained industrial and computing applications requiring minimal external components and wide supply flexibility.

Availability

ZXCT212BDSJ-7 is available at Aetrix Electronics and suitable for server power supplies, battery management systems, industrial PLC modules, and GPU VRM telemetry requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for ZXCT212BDSJ-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 manufacturer 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 computing, telecom, and industrial power systems - emphasizing zero-drift performance, wide common-mode operation, and minimal external component count.

FAQ

What is the maximum shunt voltage the ZXCT212BDSJ-7 can accurately measure?

The device supports full-scale shunt drops as low as 10mV with ±0.8% gain error and ±30μV offset, yielding <0.3% total error at 10mV. At higher drops (e.g., 20mV), error remains dominated by gain accuracy. The absolute maximum differential input is ±26V, but practical full-scale is set by output swing limits and ADC resolution.

Can ZXCT212BDSJ-7 be used for bidirectional current sensing?

Yes - by applying a DC bias voltage (e.g., V+/2) to the REF pin, the output swings symmetrically around that reference. For example, with V+ = 5V and REF = 2.5V, ±1A through a 10mΩ shunt produces OUT = 2.5V ± 10V (clamped to rail limits), enabling direction detection and magnitude measurement.

Does ZXCT212BDSJ-7 require external filtering on IN+ and IN– pins?

Input resistors should be ≤10Ω to avoid gain/CMRR degradation from bias current mismatch. A small capacitor (e.g., 0.01µF–0.1µF) may be added across the shunt or at inputs to dampen ringing from shunt inductance, but RC time constant must exceed L_shunt/R_shunt to avoid measurement delay.

How does the U-QFN1418-10 package affect thermal performance?

This 10-pin, 1.4mm × 1.8mm package has R_θJA = 115°C/W and R_θJC = 50°C/W - significantly better than SOT363 (228°C/W). With 100μA quiescent current, junction temperature rise is <12°C at 25°C ambient, enabling reliable operation in compact, thermally constrained layouts like GPU VRMs.