Diodes Incorporated ZXCT1030X8TA

Overview

ZXCT1030X8TA from Diodes Incorporated is an obsolete high-side current monitor IC with integrated 1.24 V bandgap reference and open-collector comparator, designed for ground-plane-preserving load current sensing in 2.2–20 V supply systems. It delivers 10× scaled output (VOUT = 10 × VSENSE), supports ≤500 mV sense voltage, achieves ±3% accuracy at 100 mV input, and features 3–6 MHz bandwidth for fast-switching applications like DC motor control and electronic fusing.

For engineers reviewing the ZXCT1030X8TA datasheet, ZXCT1030X8TA pinout, ZXCT1030X8TA application, or ZXCT1030X8TA equivalent, key selection considerations include its SO8 package, 10 V/V gain, 170–350 µA supply current, 30 ppm/°C VOUT temperature coefficient, and non-latching comparator behavior under common-mode collapse below 2.2 V.

Technical Context

The ZXCT1030X8TA implements a precision current-to-voltage converter using a matched internal resistor network to achieve fixed 10× gain across its 2.2–20 V common-mode input range. Its VOUT is ratiometric to VSENSE with 30 ppm/°C TC and ≤3% total accuracy, enabling direct ADC interfacing without external calibration.

The on-chip 1.24 V reference powers the comparator stage, which compares VOUT against user-configured VCOMP_IN (0.005–10 V) via external resistors. The open-collector VCOMP_OUT asserts low when VOUT exceeds VCOMP_IN, with 100 ns propagation delay and 15 mV hysteresis to prevent chatter during threshold crossing.

Key Specifications

Pinout & Package

Package: SO8 (Small Outline Integrated Circuit, 150 mil width, 1.27 mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX40056ASA+T and INA219BIDR, the ZXCT1030X8TA uniquely integrates both precision analog current scaling and autonomous comparator-based fault signaling in SO8, making it optimal for cost-sensitive, self-contained overcurrent protection where digital interface or ultra-high accuracy is unnecessary.

Availability

ZXCT1030X8TA is available at Aetrix Electronics and suitable for battery charger protection, electronic fuse implementation, and DC motor overcurrent detection requiring stable component supply despite its obsolete status.

Supply support for ZXCT1030X8TA 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, computing, and consumer markets.

The ZXCT1030 belongs to Diodes' high-side current sensing product line, engineered specifically for ground-intact, low-component-count overcurrent monitoring in space-constrained and cost-sensitive power systems.

FAQ

Is ZXCT1030X8TA still manufacturable or supported by Diodes?

No. Diodes officially discontinued ZXCT1030X8TA and marked it obsolete in June 2021. It is no longer in production, and Diodes does not provide new design support, errata updates, or reliability reports for this variant. Aetrix Electronics offers remaining inventory with full traceability and extended lifecycle coordination for legacy program continuity.

Can ZXCT1030X8TA be used with a 3.3 V supply rail?

Yes. The device operates from 2.2 V to 20 V VCC, so 3.3 V is fully within specification. At 3.3 V, VSENSE+ must remain ≥2.2 V, and VSENSE− must stay within 500 mV of VSENSE+, ensuring valid common-mode operation. VREF_OUT remains stable at 1.24 V, enabling functional comparator threshold setup even at low VCC.

What is the maximum sense resistor value usable with ZXCT1030X8TA at 20 V supply?

At 20 V VCC and 500 mV max VSENSE, the maximum sense resistor depends on load current. For example, at 1 A load, RSENSE ≤ 500 mΩ. The device's 700 mW SO8 package power dissipation limits continuous power in the sense resistor itself, but ZXCT1030X8TA only monitors voltage across RSENSE-it does not dissipate that power. Thermal design of the external sense resistor remains the system designer's responsibility.

Does VCOMP_OUT require a pull-up resistor, and what value is recommended?

Yes. VCOMP_OUT is an open-collector output and requires an external pull-up resistor to a logic-compatible voltage (e.g., 3.3 V or 5 V). Diodes recommends 10–100 kΩ; a 10 kΩ resistor ensures fast rise time and sufficient drive strength while keeping current draw low. Values below 10 kΩ increase power consumption unnecessarily; above 100 kΩ may slow edge transitions in noisy environments.