Diodes Incorporated ZXCT1009T8TA

Overview

ZXCT1009T8TA 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 - ideal for Li-ion battery chargers and portable power management systems.

For engineers reviewing the ZXCT1009T8TA datasheet, ZXCT1009T8TA pinout, ZXCT1009T8TA application, or ZXCT1009T8TA equivalent, key selection criteria include its transconductance (10 mA/V), SOT23/SM8 package options, AEC-Q100 qualification status (ZXCT1009FTA only), low-offset sensing capability, and compatibility with PCB trace shunt resistors in cost-sensitive designs.

Technical Context

The ZXCT1009T8TA implements a precision transconductance amplifier architecture that linearly converts VSENSE+–VSENSE− differential input (0–2.5V) into a proportional IOUT (up to 25 mA). Its internal design eliminates ground path disruption by referencing both sense inputs to the high-side rail.

It features a wide 2.5V–20V supply range, 300 kHz small-signal bandwidth at 10 mV input, and maintains ±2.5% total accuracy over temperature and line variations when used with RSENSE = 0.1 Ω and VSENSE = 200 mV - enabling direct integration into DC-DC converter current feedback loops and smart battery pack monitors.

Key Specifications

Pinout & Package

The ZXCT1009T8TA is housed in an SM8 package (JEDEC MS-012AC), featuring thermal-enhanced pad and 8 leads with 1.53 mm pitch. Pin 1 is marked with dot; pin numbering follows standard counter-clockwise orientation from top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA138UA and MAX4080TASA+, the ZXCT1009T8TA offers lowest quiescent current (4 µA), explicit support for PCB trace shunts, and user-configurable scaling - making it optimal for cost- and power-constrained portable and automotive subsystems where design flexibility matters.

Availability

ZXCT1009T8TA is available at Aetrix Electronics and suitable for battery chargers, smart battery packs, and DC motor control systems requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.

Supply support for ZXCT1009T8TA 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, with design centers across Asia and manufacturing facilities in China, Malaysia, and Taiwan.

The ZXCT1009 belongs to Diodes' precision analog monitoring product line, engineered specifically for high-side current sensing in space- and power-constrained applications including portable electronics, battery management, and industrial power supplies.

FAQ

What is the maximum sense voltage the ZXCT1009T8TA can handle?

The ZXCT1009T8TA supports a continuous differential sense voltage (VSENSE+ − VSENSE−) up to +2.5 V, with absolute maximum rating of +5 V. Operation beyond 2.5 V risks accuracy degradation due to internal amplifier saturation, though short-duration transients within the ±5 V limit are tolerated per absolute maximum ratings.

Can the ZXCT1009T8TA be used with a PCB copper trace as the shunt resistor?

Yes - the device's temperature coefficient compensation is explicitly designed for PCB trace shunts. With 1 oz copper, a 25 mm × 0.25 mm trace yields ~150 mΩ and exhibits PTC behavior that offsets the IC's NTC drift, maintaining linearity across −40°C to +85°C without external calibration.

Does the ZXCT1009T8TA have AEC-Q100 qualification?

No - only the ZXCT1009FTA variant (SOT23 package) is AEC-Q100 Grade 3 qualified. The ZXCT1009T8TA uses the same die but is not certified for automotive use; it is intended for industrial and consumer applications where extended temperature operation (−40°C to +85°C) is required but formal qualification is not mandated.

How do I calculate the output voltage for a given load current?

VOUT = 0.01 × VSENSE × ROUT, where VSENSE = ILOAD × RSENSE. For example, with ILOAD = 2 A, RSENSE = 0.05 Ω → VSENSE = 100 mV → VOUT = 0.01 × 0.1 × ROUT. To achieve 200 mV output, ROUT = 0.2 / (0.01 × 0.1) = 200 Ω. This scaling is linear and independent of supply voltage.