Diodes Incorporated ZXCT199C3DW-7

Overview

ZXCT199C3DW-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 delivers 200V/V fixed gain, ±0.8% max gain error over temperature, 80μV max input offset voltage, and operates from 2.7V to 26V supply with rail-to-rail output-enabling accurate monitoring in server power supplies and industrial motor controllers.

For engineers reviewing the ZXCT199C3DW-7 datasheet, ZXCT199C3DW-7 pinout, ZXCT199C3DW-7 application, or ZXCT199C3DW-7 equivalent, key selection criteria include common-mode range (-0.1V to 26V), zero-drift stability (0.5μV/°C), bidirectional operation via REF pin biasing, and SOT363 package compatibility with high-density PCB layouts.

Technical Context

The ZXCT199C3DW-7 implements a precision difference amplifier topology with chopper-stabilized zero-drift architecture to suppress offset drift and 1/f noise. Its input stage supports differential sensing across shunts at common-mode voltages up to 26V-exceeding its own 2.7–26V supply rail-making it suitable for high-side sensing without level-shifting circuitry.

It features internal matched resistor networks defining the 200V/V gain, rail-to-rail output stage capable of sourcing/sinking ≥10mA, and REF pin that sets the output zero-current baseline-enabling true bidirectional current measurement when biased to mid-supply (e.g., 2.5V for 5V V+).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3IDR and MAX4080TASA+, the ZXCT199C3DW-7 uniquely combines −0.1V common-mode support, zero-drift stability, and 200V/V gain in a 6-pin SOT363-making it optimal for high-accuracy, high-temperature, bidirectional sensing where space and thermal performance are constrained.

Availability

ZXCT199C3DW-7 is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, smart energy meters, and telecom rectifier modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for ZXCT199C3DW-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, application-optimized components for power management, signal integrity, and sensing.

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

FAQ

Can ZXCT199C3DW-7 measure current in both directions?

Yes. By applying a defined DC voltage (e.g., V+/2) to the REF pin, the device outputs a voltage centered at that reference-rising for positive shunt voltage (IN+ > IN−) and falling for negative shunt voltage (IN+ < IN−). This enables true bidirectional sensing for battery charge/discharge or motor regenerative braking applications without external op-amps.

What is the minimum shunt voltage this device can accurately resolve?

With ±80μV max input offset and 200V/V gain, the ZXCT199C3DW-7 resolves down to 0.4mV input (80μV ÷ 200) with guaranteed linearity. Combined with 10mV full-scale capability, it supports shunt resistors as low as 0.5mΩ at 20A-minimizing power loss and thermal drift in high-current paths.

Does the device require external components for stable operation?

Yes. A 0.01µF to 0.1µF ceramic bypass capacitor must be placed between V+ and GND, as close as possible to pins 2 and 3. For REF pin biasing in bidirectional mode, a low-impedance source (e.g., buffered voltage divider or precision reference) is required-unbuffered resistive dividers degrade CMRR and introduce gain error.

How does ZXCT199C3DW-7 handle common-mode voltages exceeding its supply voltage?

Its input stage is designed to tolerate IN+ and IN− voltages from −0.1V to 26V independent of V+, allowing direct high-side sensing even when shunt common-mode reaches 26V while V+ is only 3.3V or 5V. This eliminates level-shifting circuitry and associated errors, provided the output swing remains within V+ and GND bounds.