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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Current Regulation/Management

Diodes Incorporated ZXCT1051E5TA

Name: ZXCT1051E5TA
Brand: Diodes Incorporated
SKU: ZXCT1051E5TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXCT1051E5TA

Manufacturer:: Diodes Incorporated

Category:: Current Regulation/Management

Package:: SC-74A, SOT-753

Datasheet:: ZXCT1051E5TA.pdf

Description:: IC CURRENT MONITOR 1% SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:4,778

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Product details

Overview

ZXCT1051E5TA from Zetex Semiconductors is a precision wide-input-range current monitor IC with fixed 10× gain, operating from 2.7V to 20V supply and supporting common-mode sense inputs from 0V to V_CC−2V. It delivers 1% typical accuracy at 30mV sense voltage, enables high-side or low-side sensing, and features 50 µA quiescent current in SOT23-5 package - ideal for battery management and overcurrent protection in compact power systems.

For engineers reviewing the ZXCT1051E5TA datasheet, ZXCT1051E5TA pinout, ZXCT1051E5TA application, or ZXCT1051E5TA equivalent, key selection criteria include its rail-to-rail common-mode range, fixed-gain architecture eliminating external resistors, low offset enabling sub-50mV linear operation, and compatibility with high-current shunt-based monitoring where supply isolation from sensed lines is critical.

Technical Context

The ZXCT1051E5TA uses a dedicated V_CC pin to bias internal amplifiers independently of the sensed line - unlike legacy line-powered monitors - enabling true 0V common-mode sensing and sub-1µA loading on the monitored path. Its unipolar output stage limits linear operation to V_SENSE ≥10mV but ensures monotonic response down to 0V.

It implements a precision current-to-voltage conversion via internal matched R_SH/R_G ratio (10:1), delivering V_OUT = 10 × V_SENSE with 300 ppm/°C output drift, 66 dB CMRR at 20V common-mode, and 58 dB PSRR across full 2.7–20V supply range - optimized for DC and low-frequency (<1 MHz) current measurement in noisy industrial environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.7V to 20V - supports wide-input power rails including 3.3V, 5V, 12V, and 19V systems without level-shifting.
Common-Mode Input Range	0V to V_CC−2V - enables direct ground-referenced (low-side) or high-voltage (high-side) shunt placement.
Fixed Gain	10× - eliminates external gain-setting resistors, reducing BOM count and layout sensitivity.
Typical Accuracy	±1% at 30mV V_SENSE - enables use of small-value, low-power shunts (e.g., 5 mΩ @ 6A) with tight tolerance.
Quiescent Current	45–70 µA - minimizes system standby power loss in battery-critical applications like portable instrumentation.
Bandwidth	300 kHz at 10mV_PP, 1 MHz at 100mV_PP - sufficient for DC motor stall detection and slow transient overcurrent events.
Output Voltage Range	0V to V_CC−2V - compatible with standard ADC input ranges and comparator thresholds without clamping diodes.

Pinout & Package

SOT23-5 package: 2.9 mm × 1.6 mm footprint, 1.1 mm height, surface-mount, RoHS-compliant, thermal pad not present.

Pin/Terminal	Circuit Role	Design Meaning
1 - V_CC	Analog supply input	Provides independent bias for internal amplifiers; decoupling capacitor required near pin to suppress supply noise coupling into output.
2 - GND	Analog ground reference	Return path for internal circuitry; must be connected to clean system ground, separate from high-current shunt return if possible.
3 - OUT	Voltage output	Delivers 10× scaled V_SENSE; drives 10 kΩ minimum load; output impedance ≈3.75 kΩ per datasheet.
4 - V_SENSE+	Positive current-sense input	Accepts common-mode voltages from 0V to V_CC−2V; input current ≤150 nA - negligible loading on high-impedance sense nodes.
5 - V_SENSE−	Negative current-sense input	Differential partner to V_SENSE+; same common-mode range; input current ≤150 nA; connects directly to shunt resistor low side.

Key Features

Feature	Design Value
Separate V_CC supply	Enables zero-volt common-mode sensing and isolates bias current from monitored line - critical for short-circuit detection where sensed node collapses to ground.
Fixed 10× gain	Removes need for external gain resistors, eliminating matching errors, temperature drift, and PCB area - improves long-term calibration stability.
Low 30mV linear threshold	Supports accurate current measurement at <1A with 30 mΩ shunt, reducing I²R losses and thermal derating concerns in space-constrained designs.
High CMRR (66 dB)	Maintains accuracy despite large common-mode transients (e.g., motor commutation spikes), reducing need for additional filtering in noisy industrial loads.
Low quiescent current (50 µA typ.)	Extends battery life in always-on monitoring circuits - e.g., 10-year operation on a 200 mAh coin cell at 1 Hz sampling.

Applications

Battery Management System

DC Motor Control

Use Scenario: Monitoring charge/discharge current in Li-ion battery packs with 0V–4.2V cell voltage range and integrated protection ICs.

IC Role / Device Role / Timing Role: High-side current sensor feeding analog input of microcontroller ADC, providing real-time current data for state-of-charge estimation and overcurrent cutoff.

Use Value: Enables accurate ±1% current measurement down to 0.1A using 100 mΩ shunt, while surviving pack short-circuit events where V_SENSE+ drops to 0V - a capability absent in line-powered alternatives.

Use Scenario: Detecting stall current in 12V brushed DC motors used in automotive seat adjusters and HVAC actuators.

IC Role / Device Role / Timing Role: Low-side shunt monitor interfacing with MCU GPIO interrupt pin via comparator, triggering immediate PWM shutdown on >5A sustained current.

Use Value: Delivers 300 kHz bandwidth sufficient to capture motor startup surge (≤100 µs rise time), with 1% accuracy ensuring reliable trip threshold without false positives from offset drift.

Industrial Power Supply OCP

Short-Circuit Detection in PoE PSE

Use Scenario: Overcurrent protection in 24V/48V industrial SMPS with programmable current limit and auto-restart behavior.

IC Role / Device Role / Timing Role: High-side current monitor feeding error amplifier input, enabling fast foldback response (<10 µs) to output overload conditions.

Use Value: Operates up to V_CC−2V common-mode (46V at 48V supply), tolerating output rectifier forward drop and trace IR drop - ensuring consistent trip point across line/load variations.

Use Scenario: Detecting short circuits on powered Ethernet (PoE) Class 3/4 PSE ports before IEEE 802.3af/at inrush current limits are exceeded.

IC Role / Device Role / Timing Role: Low-side current monitor on 48V feed line, driving comparator with 100mV threshold corresponding to 2A fault current through 50 mΩ shunt.

Use Value: Sub-1µA loading on sensed line prevents interference with PoE signature detection; 150mV max linear V_SENSE aligns with IEEE-defined fault detection window.

Equivalent & Alternatives

The following parts are listed as comparable options for similar current monitor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX4080TASA+	Higher supply range (4.5–76V), 100V common-mode, but requires external gain resistors and draws 120 µA I_Q.	Better suited for 48V telecom or automotive battery monitoring where >40V common-mode is needed.	Select when V_SENSE exceeds 20V or ultra-high common-mode rejection (>100 dB) is required - trade-off is higher cost and design complexity.
INA193AIDBVR	2.7–18V supply, 0–26V common-mode, 50 µA I_Q, but only 1% accuracy at 100mV V_SENSE (vs. 30mV for ZXCT1051).	Optimized for mid-range shunt voltages; less suitable for ultra-low-current or battery-critical applications.	Prefer when board space allows SOT23-6 and design targets 100mV+ sense voltage - offers better PSRR (70 dB) but narrower common-mode margin than ZXCT1051.

Compared with MAX4080TASA+ and INA193AIDBVR, the ZXCT1051E5TA uniquely combines 0V common-mode operation, fixed-gain simplicity, and 1% accuracy at 30mV in SOT23-5 - making it optimal for cost-sensitive, space-constrained, and ground-referenced current sensing where supply voltage stays below 20V.

Availability

ZXCT1051E5TA is available at Aetrix Electronics and suitable for battery management, DC motor control, and industrial power supply overcurrent protection requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for ZXCT1051E5TA 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

Zetex Semiconductors (now part of Diodes Incorporated) is an ISO 9001/TS16949-certified UK-based analog IC manufacturer focused on high-performance, low-power signal conditioning and power management solutions.

The ZXCT series was designed specifically for precision current sensing in space- and power-constrained applications - emphasizing rail-to-rail common-mode range, minimal external components, and robust operation in harsh industrial and automotive environments.

FAQ

Can ZXCT1051E5TA be used for high-side current sensing with a 24V supply?

No - its absolute maximum V_CC is 20V, and common-mode input range is limited to 0V to V_CC−2V. At 24V supply, V_CC would exceed rating and V_SENSE+ could reach unsafe levels. For 24V systems, use MAX4080TASA+ (76V max) or INA240 (80V max) instead.

What is the minimum detectable current with a 10 mΩ shunt resistor?

With 10 mΩ shunt and 30mV minimum linear V_SENSE, minimum detectable current is 3A (30mV ÷ 10 mΩ). Below this, output remains monotonic but accuracy degrades beyond ±1%; for sub-amp sensing, increase shunt to 100 mΩ to achieve 300mA threshold at same accuracy.

Does ZXCT1051E5TA require external compensation capacitors?

No - the device is internally compensated for unity-gain stability. Output capacitance up to 100 pF is acceptable per datasheet; larger capacitive loads may cause ringing and require series resistance (≥10 Ω) between OUT and load to dampen.

How does ZXCT1051E5TA handle reverse current flow?

It does not measure reverse current - the output voltage cannot go below 0V, and differential input polarity is fixed (V_SENSE+ must be ≥ V_SENSE−). For bidirectional sensing, use dual-supply devices like INA226 or add external level-shifting circuitry.

ZXCT1051E5TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Current Monitor

Sensing Method:: High/Low-Side

Accuracy:: ±1%

Voltage - Input:: 2.7V ~ 20V

Current - Output:: -

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

ZXCT1051E5TA FAQ

1.How can I place an order for ZXCT1051E5TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXCT1051E5TA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ZXCT1051E5TA reliable?

The price and inventory of ZXCT1051E5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXCT1051E5TA is usually 5 days.

3.What payment methods are accepted for ZXCT1051E5TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXCT1051E5TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXCT1051E5TA?

ZXCT1051E5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXCT1051E5TA order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ZXCT1051E5TA?

For technical support, including ZXCT1051E5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXCT1051E5TA requirements.

6.How does Aetrix verify that ZXCT1051E5TA is sourced from the original manufacturer or authorized distributors?

All ZXCT1051E5TA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZXCT1051E5TA meets industry standards.

7.What is the process for return or replacement of ZXCT1051E5TA?

All ZXCT1051E5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXCT1051E5TA, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ZXCT1051E5TA part is unused and in its original packaging.

Return procedure for ZXCT1051E5TA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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