Diodes Incorporated ZXCT1080E5TA

Overview

ZXCT1080E5TA from Diodes Incorporated is a high-side current sense monitor IC with fixed 10× voltage gain, operating from 3V to 60V common-mode input range and delivering rail-to-rail output up to 1.5V. It features AEC-Q100 Grade 1 qualification, -40°C to +125°C operation, and SOT25 packaging-used in industrial power rails (24V/28V/48V), battery management systems, and automotive current monitoring where ground-plane integrity must be preserved.

For engineers reviewing the ZXCT1080E5TA datasheet, ZXCT1080E5TA pinout, ZXCT1080E5TA application, or ZXCT1080E5TA equivalent, key selection criteria include high-side sensing capability without ground disruption, VCC-independent operation under short-circuit conditions, guaranteed gain accuracy (9.8–10.2 V/V), low quiescent current (80 µA on VCC), and automotive-grade temperature resilience.

Technical Context

The ZXCT1080E5TA implements a unidirectional, single-supply high-side current monitor using an internal voltage-current converter and MOSFET-based transconductance stage, followed by a unity-gain buffered output. Its architecture enables monotonic response down to 0 mV VSENSE while maintaining linearity from 10 mV to 150 mV differential input.

It separates supply (VCC: 4.5–12 V) from sensed rail (S+/S−: 3–60 V), allowing continued functionality during load short-circuit events. CMRR exceeds 68 dB and PSRR reaches 54 dB, supporting stable operation in noisy industrial and automotive environments with wide common-mode voltage swings.

Key Specifications

Pinout & Package

SOT25 (5-pin SC-74A) package with exposed pad for thermal enhancement; footprint compatible with standard SOT-23-5 routing but electrically distinct due to high-voltage S+/S− isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXCT1080E5TA, ZXCT1082E5TA offers enhanced accuracy and broader linear range in identical packaging-ideal for design refreshes-while INA240A1D provides superior noise immunity and flexibility at the cost of layout area and supply design effort.

Availability

ZXCT1080E5TA is available at Aetrix Electronics and suitable for industrial power rail monitoring, battery management systems, and automotive load monitoring requiring stable component supply and legacy design support.

Supply support for ZXCT1080E5TA 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 power management, signal integrity, and protection solutions for industrial, automotive, and computing markets.

The ZXCT series targets high-side current sensing in harsh environments, emphasizing wide common-mode range, AEC-Q100 compliance, and simplified integration into 5V-system interfaces monitoring higher-voltage rails.

FAQ

Is ZXCT1080E5TA still recommended for new designs?

No. Diodes Incorporated explicitly states "ZXCT1080 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE ZXCT1082/84/86." The ZXCT1082E5TA is the direct drop-in replacement with improved gain accuracy, lower offset, and extended linear VSENSE range-identical SOT25 footprint and pinout.

What is the maximum allowable differential sense voltage (VSENSE) for continuous operation?

The recommended operating condition specifies VSENSE from 0 V to 0.15 V (150 mV) for linear operation. Absolute maximum rating allows 800 mV, but sustained use above 150 mV risks gain nonlinearity and thermal stress; RLIM resistor addition may extend safe range in pulsed applications.

How does the separate VCC pin improve fault tolerance?

VCC powers internal circuitry independently of the sensed high-voltage rail (S+/S−). During a load short-circuit, S+ collapses but VCC remains active-allowing the output to hold a defined "end stop" voltage (e.g., ~1.5 V) that signals fault condition to downstream circuitry without losing power.

Can ZXCT1080E5TA measure bidirectional current?

No. The ZXCT1080E5TA is unidirectional: it only monitors current flowing from S+ to S−. Output voltage is always ≥0 V and increases with forward sense voltage; no negative output or reverse-current indication capability is provided in its architecture or specifications.