Diodes Incorporated ZXCT199B1DW-7

Overview

ZXCT199B1DW-7 from Diodes Incorporated is a zero-drift, bidirectional current shunt monitor IC with 100 V/V fixed gain, ±100 µV max input offset voltage, rail-to-rail output, and operation from 2.7 V to 26 V supply. It measures differential voltages across shunts at common-mode voltages from –0.1 V to 26 V independent of supply, enabling high-precision sensing in server power supplies and industrial motor controls using low-value (e.g., 1 mΩ) sense resistors.

For engineers reviewing the ZXCT199B1DW-7 datasheet, ZXCT199B1DW-7 pinout, ZXCT199B1DW-7 application, or ZXCT199B1DW-7 equivalent, this page delivers verified specifications, real-world use cases for high-side/low-side current monitoring, thermal stability data, and validated alternative parts for design flexibility.

Technical Context

The ZXCT199B1DW-7 implements a precision zero-drift chopper-stabilized amplifier architecture with matched internal gain-setting resistors (R3/R4), delivering 100 V/V nominal gain and <0.5 µV/°C max offset drift over –40°C to +125°C. Its input stage operates with true rail-to-rail common-mode range (–0.1 V to 26 V), decoupled from V+ supply voltage.

It supports both unidirectional (REF = GND) and bidirectional (REF = mid-supply, e.g., 2.5 V) current sensing via external reference configuration. Output swing reaches within 50 mV of V+ and 5 mV of GND under load, with 30 kHz bandwidth and 25 nV/√Hz input voltage noise density.

Key Specifications

Pinout & Package

Package: SOT363 (6-pin, 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 bidirectional current sensing applications.

Compared with INA240A1IDR and MAX40056ATA+T, ZXCT199B1DW-7 uniquely supports 26 V common-mode at 2.7 V supply, offers 100 V/V gain in compact SOT363, and delivers optimal trade-off between offset (±100 µV), supply flexibility, and thermal stability for industrial power monitoring.

Availability

ZXCT199B1DW-7 is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, telecom rectifier modules, and programmable DC load testers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZXCT199B1DW-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 ZXCT199 series belongs to Diodes' precision analog product line, designed specifically for high-accuracy, low-loss current sensing in high-current infrastructure equipment where thermal stability and supply independence are critical.

FAQ

What is the maximum common-mode voltage the ZXCT199B1DW-7 can handle?

The ZXCT199B1DW-7 supports a common-mode input voltage range of –0.1 V to 26 V, independent of its supply voltage. This means it can accurately measure shunt voltage drops even when the shunt is placed on a 24 V rail while the device itself is powered from a 3.3 V supply - a key advantage for high-side sensing without level-shift circuitry.

How does the REF pin enable bidirectional current sensing?

The REF pin sets the output's zero-current baseline. When biased to mid-supply (e.g., 2.5 V on a 5 V system), positive differential input (IN+ > IN−) drives OUT above REF, indicating forward current; negative differential input drives OUT below REF, indicating reverse current. This eliminates need for dual-supply op-amps in charge/discharge monitoring.

Can ZXCT199B1DW-7 operate with a 2.7 V supply and still drive a 10 kΩ load?

Yes. At 2.7 V supply, the ZXCT199B1DW-7 guarantees VOL ≤ GND + 50 mV and VOH ≥ V+ – 200 mV into 10 kΩ, delivering usable 2.5 V output swing. Its rail-to-rail output stage and 100 µA quiescent current make it viable for low-voltage, low-power monitoring where headroom is constrained.

What layout practices improve accuracy in high-noise environments?

Place a 0.01 µF–0.1 µF ceramic bypass capacitor directly between V+ and GND pins. Route IN+ and IN− traces as matched-length, tightly coupled differential pair away from switching nodes. Use star grounding for GND, REF, and ADC reference; buffer REF with an op-amp if sourced from a resistor divider to preserve CMRR.