Diodes Incorporated ZXCT210BDW-7

Overview

ZXCT210BDW-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 200V/V fixed gain, ±30μV max offset voltage, and −0.3V to 26V common-mode input range. It measures shunt voltages as low as 10mV full-scale in high-side or low-side configurations, enabling accurate large-current monitoring in power supplies and battery systems with minimal power loss.

For engineers reviewing the ZXCT210BDW-7 datasheet, ZXCT210BDW-7 pinout, ZXCT210BDW-7 application, or ZXCT210BDW-7 equivalent, key selection criteria include its rail-to-rail output swing, 100μA max quiescent current, ±0.8% max gain error over temperature, and SOT363 package compatibility with space-constrained PCB layouts.

Technical Context

The device employs a zero-drift chopper-stabilized architecture to achieve <0.5μV/°C offset drift and 10ppm/°C gain drift across −40°C to +125°C. Its input stage operates with differential input voltage tolerance of ±26V and CMRR ≥95dB over full temperature range.

It features internal post-trim calibration for precision, supports unidirectional and bidirectional sensing via REF pin biasing, and delivers 14kHz bandwidth (ZXCT210) with 0.4V/μs slew rate while maintaining stability with ≤1nF capacitive load.

Key Specifications

Pinout & Package

SOT363 (6-pin) package with 1.3mm × 2.1mm footprint, 0.95mm height, and thermal resistance R_θJA = 228°C/W - suitable for thermally constrained PCBs with moderate power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR, ZXCT210BDW-7 offers 97% lower quiescent current and 40% smaller footprint but trades 25dB CMRR and 5× higher offset; versus ZXCT210CDW-7, it provides identical performance except for relaxed gain tolerance-making it optimal for cost-sensitive, space-constrained industrial monitoring.

Availability

ZXCT210BDW-7 is available at Aetrix Electronics and suitable for server power monitoring, battery management systems, industrial PLC I/O modules, and telecom rectifier units requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ZXCT210BDW-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 ICs for power management, signal integrity, and connectivity applications.

The ZXCT21x series belongs to Diodes' precision analog portfolio, designed specifically for high-accuracy, low-power current sensing in industrial, computing, and telecom infrastructure where thermal stability and small form factor are critical.

FAQ

What is the maximum common-mode voltage the ZXCT210BDW-7 can handle?

The ZXCT210BDW-7 supports a common-mode input voltage range of −0.3V to 26V. This allows direct high-side sensing on 24V bus rails while operating from a lower supply voltage such as 3.3V or 5V. The absolute maximum rating for IN+ and IN− pins is ±26V differential, and the device remains functional up to 26V common-mode even when powered from minimum 2.7V supply.

Can the ZXCT210BDW-7 be used for bidirectional current sensing?

Yes, the ZXCT210BDW-7 supports bidirectional sensing by applying a bias voltage to the REF pin-typically half the supply voltage (e.g., 1.65V for 3.3V V+). This centers the OUT voltage at the bias level, allowing positive and negative current flow to produce corresponding above/below REF output swings. External low-impedance REF drive is mandatory to maintain accuracy and avoid gain error.

What is the purpose of the NC pins in the SOT363 package?

The SOT363 package has two NC (no-connect) terminals: Pin 1 of the U-QFN1418-10 mapping (not present in SOT363) and Pin 7 (marked "NC" in datasheet pin table). These pins are not bonded internally and must be left floating or tied to GND-never driven or connected to active circuitry. Their presence accommodates package family pinout compatibility but adds no electrical function.

How does the zero-drift architecture improve long-term measurement stability?

The zero-drift chopper-stabilized design actively cancels input offset voltage and its drift over time and temperature. Measured offset drift is limited to 0.1–0.5μV/°C, and long-term stability is specified at 100μV max drift after 1000 hours at +125°C. This eliminates need for periodic system recalibration in applications like energy metering and industrial control where accuracy must persist over 10+ years of operation.