Diodes Incorporated ZXCT1022E5TA

Overview

ZXCT1022E5TA from Zetex Semiconductors is a precision high-side current sense monitor IC with fixed 100× gain, 2.5V–20V supply range, 25µA quiescent current, and ±3% accuracy at 10mV sense voltage-designed for battery chargers, smart battery packs, and over-current protection circuits where ground-plane integrity must be preserved.

For engineers reviewing the ZXCT1022E5TA datasheet, ZXCT1022E5TA pinout, ZXCT1022E5TA application, or ZXCT1022E5TA equivalent, key selection criteria include its ground-referred output, low-offset operation down to 10mV VSENSE, SOT23-5 footprint compatibility, and absence of external gain-setting components in current-sense signal chains.

Technical Context

The ZXCT1022 operates as a high-impedance differential amplifier with VS+ serving dual role as supply input and positive sense terminal, while VS− is the high-impedance negative sense input-enabling true high-side sensing without load-ground interruption. Its internal architecture delivers rail-to-rail output swing referenced to GND, supporting direct interfacing with ADCs or comparators.

Gain is trimmed to 100 V/V (±3%) across temperature and supply, with offset voltage low enough to maintain 3% accuracy at only 10mV sense drop. Bandwidth scales with input signal amplitude: 300 kHz at 10mV VSENSE, rising to 2 MHz at 100mV-suited for both DC monitoring and transient over-current detection.

Key Specifications

Pinout & Package

SOT23-5 package: compact 2.9mm × 2.8mm surface-mount outline with 0.95mm pin pitch; thermally enhanced for 450mW dissipation at TA = 25°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4080TASA+ and INA193AIDBVR, ZXCT1022E5TA uniquely balances ultra-low IQ (25µA), proven 10mV operation, and SOT23-5 size-making it optimal for portable, battery-constrained designs where minimal shunt loss and board area are primary constraints.

Availability

ZXCT1022E5TA is available at Aetrix Electronics and suitable for battery charger monitoring, smart battery pack protection, and DC motor control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for ZXCT1022E5TA 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

Zetex Semiconductors (now part of Diodes Incorporated) is an ISO 9001/TS16949-certified analog IC manufacturer focused on high-performance, low-power signal-conditioning solutions.

The ZXCT series was developed specifically for precision current sensing in space- and power-constrained applications-emphasizing minimal external components, ground-referenced outputs, and robust operation across battery voltage ranges.

FAQ

What is the minimum sense voltage for guaranteed 3% accuracy?

The ZXCT1022E5TA achieves ±3% accuracy at VSENSE = 10mV under standard test conditions (Tamb = 25°C, VIN = 15V). This is validated in the datasheet's Electrical Characteristics table and confirmed by typical accuracy curves showing <±3% deviation down to 10mV. Operation below 10mV is functional but accuracy degrades beyond specification limits.

Can VSENSE+ be used as the main supply while measuring current on a separate 24V rail?

No-VSENSE+ serves as both supply and high-side sense input; its voltage defines the maximum common-mode voltage the device can tolerate. The absolute maximum rating for VSENSE+ is 20V relative to GND. Applying 24V would exceed this limit and risk permanent damage. For 24V rails, use a current sense amplifier rated to ≥24V CMVR, such as the MAX4080.

Is the NC pin required to be left open, or can it be tied to GND?

The NC pin must remain unconnected-neither tied to GND nor any other potential. The datasheet explicitly states "Not internally connected," and connecting it may introduce parasitic coupling or alter thermal behavior. Layout guidelines recommend keeping the NC pad floating and avoiding solder mask or trace routing over it to prevent unintended capacitance or leakage paths.

Does the ZXCT1022E5TA support bidirectional current sensing?

No-it is a unidirectional high-side current monitor optimized for positive current flow from VSENSE+ to VSENSE−. The output voltage increases linearly with increasing VSENSE (VS+ − VS−) and cannot go below 0V. Bidirectional sensing requires a device with bipolar output swing or dedicated zero-current reference, such as the INA210 or MAX4081, neither of which matches the ZXCT1022E5TA's architecture or pinout.