Diodes Incorporated ZXCT215CDW-7

Overview

ZXCT215CDW-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 75 V/V fixed gain, ±0.5% max gain error over temperature, ±60 µV max input offset voltage, and rail-to-rail output swing. It operates from 2.7V to 26V supply, supports common-mode voltages from –0.3V to 26V, and enables accurate low-side or high-side current monitoring in power supplies and battery management systems using a 10 mV full-scale shunt drop.

For engineers reviewing the ZXCT215CDW-7 datasheet, ZXCT215CDW-7 pinout, ZXCT215CDW-7 application, or ZXCT215CDW-7 equivalent, this device is selected for high-accuracy bidirectional current sensing where low offset drift (0.1 µV/°C typ), 10 ppm/°C max gain drift, and 40 kHz bandwidth at 75× gain are critical design requirements.

Technical Context

The ZXCT215CDW-7 uses a zero-drift chopper-stabilized architecture with post-trim calibration to achieve ±60 µV max offset and 0.1 µV/°C typical offset drift across –40°C to +125°C. Its differential input stage rejects common-mode voltages up to 26V while operating from as low as 2.7V supply - enabling measurement on high-voltage rails without level-shifting.

It delivers rail-to-rail output swing into 10 kΩ loads, supports unidirectional or bidirectional sensing via REF pin biasing, and features 100 µA max quiescent current. The SOT363 package provides thermal resistance of 228 °C/W (junction-to-ambient), suitable for space-constrained industrial and computing applications.

Key Specifications

Pinout & Package

SOT363 (6-pin) package with 1.3 mm × 2.1 mm footprint, 0.95 mm height, and exposed pad for thermal enhancement. Pin 1 = REF, Pin 2 = GND, Pin 3 = V+, Pin 4 = IN+, Pin 5 = IN–, Pin 6 = OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056AUB+, the ZXCT215CDW-7 uniquely supports direct 24 V common-mode sensing with 2.7–26 V supply flexibility and superior offset stability (±60 µV vs. ±125–150 µV), making it optimal for industrial and telecom power monitoring where wide voltage range and long-term precision are prioritized over automotive qualification or ultra-high bandwidth.

Availability

ZXCT215CDW-7 is available at Aetrix Electronics and suitable for server power monitoring, battery management systems, industrial PLC I/O modules, and high-performance GPU power delivery requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for ZXCT215CDW-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 belongs to Diodes' precision analog product line, designed specifically for high-accuracy, low-power current sensing in industrial, computing, and telecom infrastructure where zero-drift performance and wide common-mode operation are essential.

FAQ

What is the maximum common-mode voltage the ZXCT215CDW-7 can measure?

The ZXCT215CDW-7 supports a common-mode input voltage range of –0.3 V to 26 V. This allows direct high-side current sensing on 24 V rails without external level-shifting circuitry. The specification is guaranteed over the full operating temperature range (–40°C to +125°C) and applies to both IN+ and IN– pins relative to GND. Exceeding 26 V may cause permanent damage per Absolute Maximum Ratings.

Can the ZXCT215CDW-7 be used for bidirectional current sensing?

Yes - bidirectional sensing is supported by applying a bias voltage (typically V+/2) to the REF pin, causing the OUT pin to swing symmetrically above and below that reference. The device's rail-to-rail output and low offset enable accurate signed current representation. Layout must maintain low-impedance REF routing and avoid noise coupling, as REF directly sets the output midpoint and affects measurement null point.

What is the recommended shunt resistor value for a 10 A full-scale measurement?

For 10 A full-scale with 10 mV full-scale shunt drop (as specified in the datasheet), use R_SHUNT = 10 mV / 10 A = 1 mΩ. With 75 V/V gain, this yields 750 mV output. Ensure the shunt's power rating exceeds I²R = 100 A² × 0.001 Ω = 0.1 W, and select a 4-terminal Kelvin-connected shunt to minimize parasitic resistance errors in high-accuracy applications.

Does the ZXCT215CDW-7 require external compensation capacitors?

No external compensation is required for stability under standard conditions. The device is unity-gain stable with capacitive loads up to 1 nF. However, if input RC filtering is added (e.g., to suppress shunt inductance-induced ringing), series resistors must be ≤10 Ω to avoid degrading CMRR and gain accuracy. A 0.1 µF ceramic bypass capacitor between V+ and GND, placed within 2 mm of the pins, is mandatory for noise immunity and supply decoupling.