Diodes Incorporated ZXCT1009FTA

Overview

ZXCT1009FTA from Diodes Incorporated is a high-side current sense monitor IC that converts differential shunt voltage into a proportional output current, enabling ground-plane–intact load monitoring. It operates from 2.5V to 20V supply, delivers 1% typical accuracy, supports up to 2.5V sense voltage, and draws only 4µA quiescent current in SOT23-3 package-ideal for Li-ion battery chargers and portable power management.

For engineers reviewing the ZXCT1009FTA datasheet, ZXCT1009FTA pinout, ZXCT1009FTA application, or ZXCT1009FTA equivalent, key selection criteria include transconductance (10 mA/V), sense voltage range (0–2.5 V), AEC-Q100 Grade 3 qualification, low quiescent current (4 µA), and SOT23-3 thermal performance (450 mW @ 25°C).

Technical Context

The ZXCT1009FTA implements a precision transconductance amplifier architecture with fixed 10 mA/V gain, translating VSENSE+–VSENSE− differential input into a rail-to-rail output current (IOUT). Its internal topology eliminates ground-path disruption and avoids common-mode voltage limitations of low-side sensing.

It features built-in offset compensation yielding ±2.5% total accuracy over temperature and supply variation, operates down to 2.5V supply while maintaining full 0–2.5V sense range, and maintains stable bandwidth (300 kHz at 10 mV input) without external compensation components.

Key Specifications

Pinout & Package

SOT23-3 package (3.0 × 2.9 × 1.1 mm, 450 mW P_D @ 25°C) with gull-wing leads, moisture sensitivity level 1, and Pb-free matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current monitoring applications.

Compared with INA199A1DRVT and ZXCT1008FTA, the ZXCT1009FTA uniquely balances automotive qualification, ultra-low IQ, and full 2.5 V sense capability in SOT23-making it optimal for battery-powered AEC-Q100 systems requiring long runtime and robust overload detection.

Availability

ZXCT1009FTA is available at Aetrix Electronics and suitable for battery chargers, smart battery packs, and DC motor control systems requiring stable component supply, automotive-grade reliability, and low-power current sensing.

Supply support for ZXCT1009FTA 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, headquartered in Plano, Texas, serving industrial, computing, communications, and automotive markets with high-reliability components.

The ZXCT current sense monitor product line targets high-accuracy, low-power, high-side current measurement in space-constrained and battery-sensitive applications-including automotive body electronics and portable energy systems.

FAQ

What is the maximum allowable sense voltage for ZXCT1009FTA, and what happens beyond that?

The absolute maximum sense voltage (VSENSE = VSENSE+ − VSENSE−) is 2.5 V. Exceeding this risks output saturation and gain compression; the device remains functional but accuracy degrades beyond ±2.5% due to internal amplifier clipping. The datasheet specifies 0–2.5 V as the linear operating range for guaranteed 1% typical accuracy.

Can ZXCT1009FTA be used with a floating ground or isolated power supply?

No-the IOUT pin must be referenced to the same ground as ROUT. While VSENSE+ and VSENSE− operate at high common-mode potential, the output stage sinks current to system ground. For true isolation, a separate isolated amplifier or digital current sensor is required; ZXCT1009FTA provides high-side sensing only-not galvanic isolation.

How does temperature affect accuracy, and is external calibration needed?

Total unadjusted error is ±2.5% over −40°C to +85°C, including offset drift, gain drift, and nonlinearity. Diodes' internal trimming eliminates need for system-level calibration in most applications. No external components are required to maintain spec-only ROUT stability affects final voltage output accuracy.

Is ZXCT1009FTA compatible with PCB trace shunts, and how does copper PTC interact with device NTC?

Yes-the device's negative temperature coefficient (NTC) in transconductance is intentionally designed to compensate for the positive temperature coefficient (PTC) of copper PCB traces. Using a 25 mm × 0.25 mm, 1 oz copper shunt (~150 mΩ) yields near-zero net temperature-induced gain error across −40°C to +85°C, validated in Diodes' application note AN-501.