Diodes Incorporated ZXCT199B2DW-7

Overview

ZXCT199B2DW-7 from Diodes Incorporated is a zero-drift, bidirectional current shunt monitor IC designed for high-precision sensing across low-value shunt resistors in high-current systems. It features 100 V/V fixed gain, ±100 µV max input offset voltage (–40°C to +125°C), rail-to-rail output swing, and operates from 2.7 V to 26 V supply with 100 µA max quiescent current. Used in server power rails and industrial motor controllers where <10 mV full-scale shunt drop is required.

For engineers reviewing the ZXCT199B2DW-7 datasheet, ZXCT199B2DW-7 pinout, ZXCT199B2DW-7 application, or ZXCT199B2DW-7 equivalent, this page delivers verified specifications, SOT363 package layout, bidirectional sensing configuration guidance, and real-world design trade-offs versus alternative current monitors.

Technical Context

The ZXCT199B2DW-7 implements a precision difference amplifier with zero-drift chopper-stabilized architecture, enabling stable offset performance of ≤0.5 µV/°C over –40°C to +125°C. Its input stage supports common-mode voltages from –0.1 V to 26 V independent of supply voltage, allowing direct high-side sensing above V+.

It uses internal matched resistor networks to set fixed 100 V/V gain, achieving ±1.0% max gain error over temperature. The REF pin accepts externally applied bias (0 V to V+) to configure unidirectional or bidirectional operation-e.g., 2.5 V reference enables symmetric ±5 mV input range mapping to 0–5 V output.

Key Specifications

Pinout & Package

Package: 6-pin SOT363 (2.1 mm × 2.0 mm × 1.0 mm, 0.95 mm pitch), lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and MAX4080TASA+, the ZXCT199B2DW-7 uniquely combines 100 V/V gain, ±100 µV offset, zero-drift stability, and REF-configurable bidirectionality in a 2.7–26 V supply range - making it optimal for high-accuracy, wide common-mode industrial and computing current sensing where shunt voltage must stay below 10 mV.

Availability

ZXCT199B2DW-7 is available at Aetrix Electronics and suitable for server power management, industrial motor control, telecom rectifier protection, and programmable power supply sensing requiring stable component supply across extended temperature and voltage ranges.

Supply support for ZXCT199B2DW-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 devices for power management, signal integrity, and connectivity applications.

The ZXCT199 series belongs to Diodes' precision analog product line, engineered specifically for high-accuracy current sensing in high-current, wide common-mode industrial and computing power systems.

FAQ

What is the maximum common-mode voltage the ZXCT199B2DW-7 can measure when powered from 3.3 V?

The ZXCT199B2DW-7 supports common-mode voltages from –0.1 V to 26 V regardless of supply voltage. When V+ = 3.3 V, it can still accurately measure differential signals across a shunt placed at 24 V - a key advantage for high-side sensing in low-voltage control systems interfacing to high-voltage power stages.

How do I configure the ZXCT199B2DW-7 for bidirectional current sensing?

Apply a stable DC voltage to the REF pin - typically V+/2 (e.g., 2.5 V for 5 V supply). With REF = 2.5 V, a 0 mV shunt voltage yields 2.5 V output; +5 mV yields 3.0 V; –5 mV yields 2.0 V. Use a buffered voltage divider or precision reference to avoid REF impedance errors that directly add to output offset.

Does the ZXCT199B2DW-7 require an external bypass capacitor?

Yes - a 0.01 µF to 0.1 µF ceramic capacitor must be placed between V+ and GND, as close as possible to pins 2 and 3. This stabilizes the internal amplifier and prevents oscillation, especially under noisy supply conditions or when driving capacitive loads exceeding 1 nF.

Can the ZXCT199B2DW-7 be used in automotive applications?

The standard ZXCT199B2DW-7 is rated for –40°C to +125°C and meets industrial reliability standards, but Diodes offers the automotive-qualified ZXCT199Q variant (AEC-Q100 Grade 1) with enhanced ESD (8 kV HBM) and validated PPAP documentation - recommended for under-hood or battery-management use cases.