Diodes Incorporated ZXCT211QBDW-7

Overview

ZXCT211QBDW-7 from Diodes Incorporated is an automotive-grade, zero-drift, high-precision current-sense amplifier with 500V/V fixed gain, ±30μV max offset voltage, and -0.3V to 26V common-mode input range. It measures low-side or high-side shunt voltages as small as 10mV full-scale with ±0.8% max gain error over temperature, enabling accurate large-current monitoring in EV on-board chargers and battery management systems.

For engineers reviewing the ZXCT211QBDW-7 datasheet, ZXCT211QBDW-7 pinout, ZXCT211QBDW-7 application, or ZXCT211QBDW-7 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, rail-to-rail output swing, 100μA max quiescent current, and SOT363 package compatibility with space-constrained automotive PCB layouts.

Technical Context

The ZXCT211QBDW-7 employs a zero-drift chopper-stabilized architecture to achieve ±30μV max input offset and 0.1–0.5μV/°C offset drift across -40°C to +125°C. Its internal post-trim process ensures stable 500V/V gain with ≤10ppm/°C drift and ≥95dB CMRR at full temperature range.

It operates from a single 2.7V–26V supply and supports bidirectional sensing via REF pin biasing while maintaining rail-to-rail output (V_OH = V⁺ – 0.05V, V_OL = GND + 5mV) into 10kΩ loads, with 7kHz bandwidth and 0.4V/μs slew rate for dynamic current transients.

Key Specifications

Pinout & Package

Package: 6-pin SOT363 (2.15mm × 2.10mm × 0.95mm), moisture sensitivity level 1, matte tin-plated leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXCT211QBDW-7, INA240A1QDRQ1 trades common-mode range and quiescent current for lower offset, while MAX40056ATA+T extends voltage capability but sacrifices automotive qualification and precision-making ZXCT211QBDW-7 optimal for AEC-Q100-compliant, low-power, high-accuracy 26V-domain sensing.

Availability

ZXCT211QBDW-7 is available at Aetrix Electronics and suitable for EV on-board chargers, battery management systems, and electric power steering modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for ZXCT211QBDW-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 automotive, industrial, and consumer markets.

The ZXCT21xQ series was designed specifically for high-accuracy, AEC-Q100-compliant current sensing in electric vehicle power systems-including OBC, BMS, and ADAS-where low offset, wide common-mode range, and ultra-low quiescent current are mandatory.

FAQ

What is the maximum shunt voltage this device can accurately measure?

The ZXCT211QBDW-7 supports full-scale shunt drops as low as 10mV due to its 500V/V gain and ±30μV offset. At 10mV input, it delivers 5V output-ideal for 5V ADCs. For 3.3V ADCs, a 6.6mV full-scale shunt is supported. The device maintains ±0.8% gain error across -40°C to +125°C, ensuring consistent accuracy without recalibration.

Can this part 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 above and below that reference, enabling bidirectional current detection. This configuration is explicitly validated for battery charge/discharge monitoring in BMS applications per the datasheet's Figure 20. The REF pin must be driven by a low-impedance source to avoid gain and offset errors.

Does the SOT363 package support automated optical inspection (AOI) after reflow?

Yes. The SOT363 package features gull-wing leads with 0.65mm pitch and defined solder joint geometry per JEDEC standards. Its matte tin plating and controlled coplanarity (<0.1mm) ensure reliable AOI detection of solder bridging, insufficient fill, and lateral shift. Diodes Incorporated specifies IPC-A-610 Class 2/3 compliance for this package in automotive production environments.

How does the zero-drift architecture improve performance over conventional current-sense amplifiers?

The chopper-stabilized zero-drift design reduces input offset voltage to ±30μV max and limits drift to ≤0.5μV/°C-over 10× better than standard op-amp-based amplifiers. This enables accurate 10mV shunt measurements across automotive temperature ranges without external calibration, directly improving SOC estimation fidelity and thermal management response in EV power systems.