Diodes Incorporated ZXCT212QADW-7

Overview

ZXCT212QADW-7 from Diodes Incorporated is an automotive-grade, zero-drift, high-precision current-sense amplifier with 1000 V/V fixed gain, ±30 µV max offset voltage, and -0.3 V to 26 V common-mode input range. It measures low-side or high-side shunt voltages as small as 10 mV full-scale while operating from 2.7 V to 26 V supply, enabling accurate large-current monitoring in EV battery management systems.

For engineers reviewing the ZXCT212QADW-7 datasheet, ZXCT212QADW-7 pinout, ZXCT212QADW-7 application, or ZXCT212QADW-7 equivalent, key selection criteria include gain accuracy (±0.8% max over temperature), rail-to-rail output swing, 10 ppm/°C gain drift, and AEC-Q100 Grade 1 qualification for automotive powertrain and ADAS subsystems.

Technical Context

The ZXCT212QADW-7 employs a zero-drift chopper-stabilized architecture with post-trim calibration to achieve ±30 µV max input offset and 0.1–0.5 µV/°C offset drift across -40°C to +125°C. Its differential input stage supports bidirectional sensing when biased via the REF pin and maintains 95 dB CMRR at full temperature range.

It delivers rail-to-rail output swing (within 50 mV of V+ and 5 mV of GND) into 10 kΩ loads, features 4 kHz bandwidth (C_L = 10 pF), and draws only 65–100 µA quiescent current-enabling integration into low-power, high-voltage automotive sensor nodes without compromising precision.

Key Specifications

Pinout & Package

Package: 6-pin SOT363 (2.15 mm × 2.10 mm × 0.95 mm), RoHS-compliant, halogen- and antimony-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056ATA+T, the ZXCT212QADW-7 uniquely balances AEC-Q100 Grade 1 compliance, SOT363 miniaturization, and 1000 V/V gain in a single RoHS/Green package-making it optimal for volume automotive applications where footprint, qualification, and gain match are jointly constrained.

Availability

ZXCT212QADW-7 is available at Aetrix Electronics and suitable for EV on-board chargers, battery management systems, electric power steering modules, and ADAS radar power supplies requiring stable component supply across automotive production lifecycles.

Supply support for ZXCT212QADW-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 manufacturing certified to IATF 16949 and AEC-Q100 standards.

The ZXCT21xQ series targets automotive current sensing, delivering zero-drift precision in compact packages for high-voltage, high-reliability applications including EV power conversion and safety-critical control systems.

FAQ

What is the maximum common-mode voltage the ZXCT212QADW-7 can withstand during load dump events?

The ZXCT212QADW-7 supports a common-mode input range of -0.3 V to 26 V per datasheet specifications. During ISO 7637-2 Pulse 1 (load dump), transient spikes may exceed 26 V, but the device's absolute maximum rating for IN+ and IN− pins is -26 V to +26 V differential and -0.3 V to 26 V common-mode. External clamping (e.g., TVS diodes) is recommended for sustained >26 V excursions to prevent latch-up or permanent damage.

Can the ZXCT212QADW-7 measure bidirectional current without external op-amps?

Yes-the ZXCT212QADW-7 supports true bidirectional sensing by applying a bias voltage (e.g., V+/2) to the REF pin. This shifts the output voltage around the bias point, allowing positive current to produce V_OUT > V_REF and negative current to produce V_OUT < V_REF. The REF pin must be driven by a low-impedance source (<10 Ω) to avoid gain error; no external amplification is needed for basic bidirectional readout.

How does the 1000 V/V gain affect minimum detectable current with a 100 µΩ shunt resistor?

With a 100 µΩ shunt and 1000 V/V gain, the ZXCT212QADW-7 produces 100 mV output per 1 A of load current (V_OUT = I × 100 µΩ × 1000 = I × 0.1 V). Given its ±30 µV max offset, the minimum resolvable current is ~300 mA (30 µV ÷ 0.1 V/A), enabling precise detection of leakage currents and partial-load conditions in high-power systems.

Is the SOT363 package suitable for reflow soldering in automotive PCB assembly?

Yes-the SOT363 package is qualified for standard lead-free reflow profiles per J-STD-020 Moisture Sensitivity Level 1. Its matte tin-plated leads meet MIL-STD-202 Method 208 solderability requirements, and the maximum peak temperature rating is +260°C for 30 seconds. Thermal design should account for R_θJA = 228°C/W to ensure junction temperature stays below +150°C under worst-case power dissipation (≤2.6 mW).