Diodes Incorporated ZXCT1082QE5TA

Overview

ZXCT1082QE5TA from Diodes Incorporated is an automotive-grade, high-side unipolar current sense monitor in SOT25 package, designed for precision load-current measurement without ground-plane disruption. It features 60V max operating voltage, ±0.2mV input offset voltage (typ), 0.6µA quiescent current, and AEC-Q100 Grade 1 qualification - enabling accurate battery management and overcurrent monitoring in 24–28V industrial and automotive systems.

For engineers reviewing the ZXCT1082QE5TA datasheet, ZXCT1082QE5TA pinout, ZXCT1082QE5TA application, or ZXCT1082QE5TA equivalent, this device supports high-common-mode (2.7–60V), low-error current sensing with external gain-setting resistors (RG/RGT), and operates across –40°C to +125°C ambient temperature - critical for PPAP-compliant automotive power rail monitoring.

Technical Context

The ZXCT1082QE5TA implements a transconductance-based current-output architecture where output current (I_OUT) = V_SENSE × G_T, with G_T = 200 µA/V (typ) set by external RG and RGT resistors. Its independent supply (V_CC) and common-mode input (V_S+/V_S−) rails allow operation with VS+ up to 60V while V_CC remains at 2.7–60V - decoupling sensing accuracy from supply regulation.

It achieves ±1% transconductance error (–40°C to +125°C), 500kHz small-signal bandwidth at G = 25, and 80dB PSRR/CMRR - enabling stable current measurement under noisy 12V/24V automotive transients including load dump. Input bias currents remain ≤5µA across full temperature range, minimizing sense-resistor error.

Key Specifications

Pinout & Package

SOT25 (5-pin, 8mm tape-and-reel) package with exposed pad thermal path; RoHS-compliant, halogen-free, lead-free construction per Diodes Inc. AP02002 outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4080TASA+ and INA240A1QDRQ1, ZXCT1082QE5TA offers the lowest quiescent current (0.6µA vs. 125µA/2.4mA), SOT25 size advantage, and external gain configurability - making it optimal for space-constrained, battery-sensitive automotive modules requiring tunable bandwidth and precision.

Availability

ZXCT1082QE5TA is available at Aetrix Electronics and suitable for automotive battery management, industrial 24V power rail monitoring, and EV onboard charger input protection requiring stable component supply with AEC-Q100 compliance and PPAP support.

Supply support for ZXCT1082QE5TA 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets, with emphasis on high-reliability, AEC-Q100-qualified components.

ZXCT1082QE5TA belongs to Diodes' automotive-qualified high-side current monitor product line, engineered specifically for precision, low-power, high-voltage sensing in battery management and power distribution systems where ground-path integrity is critical.

FAQ

What is the maximum sense voltage (V_SENSE) the ZXCT1082QE5TA can accurately measure?

The ZXCT1082QE5TA specifies a differential sense input voltage range of 0 to 0.5V. Operation beyond 0.5V risks nonlinearity and saturation; for optimal accuracy, V_SENSE should be kept between 10mV and 150mV, where transconductance remains fully linear and gain error is minimized to ±1%.

Can the ZXCT1082QE5TA be used with a single 3.3V supply for both V_CC and output conditioning?

Yes - V_CC may be supplied from 3.3V while sensing common-mode voltages up to 60V. However, the output current (I_OUT) must be converted to voltage using a load resistor (R_L) tied to a separate reference (e.g., 3.3V or ground). With 3.3V supply, R_L must be sized so that I_OUT × R_L ≤ 3.3V – 0.8V (output headroom), limiting max R_L to ~12.5kΩ at 200µA full-scale.

How does the ZXCT1082QE5TA handle reverse polarity or negative V_SENSE conditions?

The ZXCT1082QE5TA is unidirectional and only monitors positive current flow (S+ more positive than S−). If V_SENSE becomes negative, the output current collapses near zero - no reverse-current indication or clamping is provided. For bidirectional sensing, a separate design with dual-supply op-amp or dedicated bidirectional IC (e.g., ZXCT1083Q variant with different gain structure) is required.

Is layout guidance available for minimizing offset drift due to thermal gradients on the S+ and S− traces?

Yes - Diodes Inc. recommends symmetrical, matched-length routing for S+ and S− traces with identical copper weight and proximity to reduce thermocouple-induced offset. The SOT25 package's pin 3 (S+) and pin 4 (S−) are adjacent; placing the sense resistor directly between them - with Kelvin connections - and avoiding vias or stubs on these nodes reduces thermal EMF and improves sub-mV offset stability across temperature.