Diodes Incorporated ZXCT213BDW-7

Overview

ZXCT213BDW-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier optimized for bidirectional and unidirectional shunt-based current monitoring in industrial power supplies and battery management systems. It features 50V/V fixed gain, ±90μV maximum input offset voltage over temperature, rail-to-rail output swing, and operates from 2.7V to 26V supply with 100μA max quiescent current. Its -0.3V to 26V common-mode input range enables accurate sensing on high-side or low-side shunts at up to 26V rail voltages.

For engineers reviewing the ZXCT213BDW-7 datasheet, ZXCT213BDW-7 pinout, ZXCT213BDW-7 application, or ZXCT213BDW-7 equivalent, this device is selected for precision DC/low-frequency current measurement where sub-1% gain error (±0.8%), low thermal drift (10ppm/°C), and minimal power loss from 10mV full-scale shunt drops are required.

Technical Context

The ZXCT213BDW-7 implements a chopper-stabilized zero-drift architecture to maintain ±90μV max V_OS and 10ppm/°C gain drift across -40°C to +125°C. Its differential input stage supports common-mode voltages extending 0.3V below ground and up to the 26V supply rail, enabling direct connection to high-voltage shunts without level-shifting.

It delivers rail-to-rail output voltage (V_OH = V+ – 0.05V, V_OL = GND + 5mV) into 10kΩ loads and maintains stability with ≤1nF capacitive load. The REF pin accepts an external bias voltage to support bidirectional current sensing, while internal post-trim calibration ensures ±0.8% max gain error over temperature.

Key Specifications

Pinout & Package

SOT363-6 package: ultra-compact 2.1mm × 2.0mm surface-mount outline with exposed pad for thermal performance; rated R_θJA = 228°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and MAX40056ATA+, the ZXCT213BDW-7 uniquely combines 50V/V gain, 26V common-mode tolerance, REF-biased bidirectional capability, and 100μA quiescent current - making it optimal for high-voltage, low-power, dual-direction current monitoring where supply headroom and layout simplicity are constrained.

Availability

ZXCT213BDW-7 is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and server rack power distribution requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for ZXCT213BDW-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 targets precision current sensing in harsh environments - designed specifically for high-accuracy, low-loss measurement in industrial, computing, and automotive power systems where thermal stability and wide common-mode operation are critical.

FAQ

What is the maximum shunt voltage the ZXCT213BDW-7 can accurately measure?

The ZXCT213BDW-7 is specified for full-scale shunt drops of 10mV, producing a 500mV output (50V/V × 10mV). While it can tolerate differential inputs up to ±26V, accuracy degrades beyond 10mV due to nonlinearity (±0.01%) and gain error drift. For higher shunt voltages, use lower-gain variants like ZXCT214 (100V/V) or ZXCT212 (1000V/V) to maintain 10mV full-scale compliance.

Can the ZXCT213BDW-7 be used for bidirectional current sensing without external components?

Yes - bidirectional operation is enabled by applying a mid-supply voltage (e.g., V+/2) to the REF pin. This biases the OUT pin at V+/2, allowing positive current to raise and negative current to lower the output symmetrically. No external op-amps or level shifters are needed, but REF must be driven by a low-impedance source (<1kΩ) to avoid gain and offset errors.

How does the SOT363 package affect thermal performance in continuous 100mA output applications?

The SOT363 package has R_θJA = 228°C/W. At 100μA supply current and no load, power dissipation is ~2.6mW (26V × 100μA), causing <0.6°C junction rise. Even with 10mA output into 10kΩ (100mW), self-heating remains <23°C above ambient - well within the +125°C operating limit. Thermal derating is not required for typical current-sense use cases.

Is the ZXCT213BDW-7 compatible with 1.8V ADC references?

No - its rail-to-rail output minimum is GND + 5mV and maximum is V+ – 50mV. With a 2.7V supply, output spans 5mV to 2.65V, which exceeds 1.8V ADC full scale. To interface with 1.8V ADCs, operate the device from 2.5V–3.0V supply or add a precision resistor divider (with matched 0.1% tolerance) to scale the output while preserving linearity and offset accuracy.