Diodes Incorporated ZXCT1087E5TA

Overview

ZXCT1087E5TA from Diodes Incorporated is a precision high-side current monitor IC with fixed 50× voltage gain, designed for unipolar current sensing in high-common-mode-voltage industrial and automotive systems. It operates from 2.7V to 40V supply, delivers 50 V/V gain with ±2% gain error over −40°C to +125°C, features 0.6 µA quiescent current, and is AEC-Q100 Grade 1 qualified for under-hood automotive use.

For engineers reviewing the ZXCT1087E5TA datasheet, ZXCT1087E5TA pinout, ZXCT1087E5TA application, or ZXCT1087E5TA equivalent, key selection criteria include its 40V max common-mode input range, SOT25 package compatibility, low-offset (±2.5 mV) performance across temperature, and suitability for battery management, overcurrent protection, and 24V/28V rail monitoring where ground-plane integrity must be preserved.

Technical Context

The ZXCT1087E5TA implements a high-impedance differential input stage with independent supply and common-mode voltage domains, enabling accurate sensing at VS+ up to 40V while powered from a separate 2.7–40V VCC rail. Its internal transconductance-to-voltage conversion is fixed at 50 V/V, eliminating external gain-setting resistors required by ZXCT1082/83 variants.

It uses a current-output architecture in ZXCT1082/83 but delivers a buffered voltage output referenced to VS−, with output swing limited to VS− − 1 V to VS− − 0.8 V. CMRR and PSRR both exceed 80 dB across −40°C to +125°C, supporting robust operation in noisy 24V industrial bus environments.

Key Specifications

Pinout & Package

SOT25 (5-pin SC-74A) package: compact 2.8 mm × 1.6 mm footprint with 0.95 mm height, optimized for space-constrained PCB layouts in automotive ECUs and industrial controllers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX4080TASA+, the ZXCT1087E5TA uniquely combines AEC-Q100 Grade 1 qualification, ultra-low 0.6 µA quiescent current, and SOT25 footprint-making it optimal for space- and power-constrained automotive and industrial high-side sensing where unidirectional measurement suffices.

Availability

ZXCT1087E5TA is available at Aetrix Electronics and suitable for automotive load monitoring, industrial 24V power rail sensing, and battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for ZXCT1087E5TA 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 components for automotive, industrial, and computing markets.

The ZXCT108x series belongs to Diodes' precision current sensing product line, engineered specifically for high-common-mode-voltage, low-power, high-accuracy applications in harsh environments such as engine compartments and factory floors.

FAQ

What is the maximum allowable common-mode voltage at S+ and S− pins?

The ZXCT1087E5TA supports a common-mode input range of 2.7 V to 40 V at both S+ and S− pins. Absolute maximum ratings specify −0.3 V to +45 V, meaning it safely handles transient overvoltages up to 45 V without damage, provided differential input remains within ±800 mV and input current stays below ±12 mA.

Can ZXCT1087E5TA be used with a 5 V microcontroller ADC without level shifting?

Yes. With a 100 mV sense voltage, ZXCT1087E5TA outputs 5.0 V (50 × 0.1 V), which exceeds typical 5 V ADC full scale. To avoid saturation, use a 50 mV or lower sense voltage (e.g., 5 mΩ shunt at 10 A yields 50 mV → 2.5 V output), or add a precision resistive divider at the OUT pin calibrated for gain and offset error.

How does the device handle reverse polarity or negative VSENSE?

The ZXCT1087E5TA is unidirectional and designed only for positive VSENSE (S+ > S−). If S− exceeds S+, the output saturates near VS− − 1 V and provides no valid reading. It does not support reverse-current detection or bipolar operation-use INA240 or similar for bidirectional applications.

Is external compensation required for stability with capacitive loads?

No external compensation is needed for loads ≤100 pF. For heavier capacitive loads (>1 nF), a series 10 Ω resistor between OUT and the load is recommended to prevent peaking or oscillation. The 125 kΩ output impedance and internal compensation ensure stability with standard PCB traces and typical ADC input capacitance.