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Diodes Incorporated ZXCT1021E5TA
- Part No.:
- ZXCT1021E5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ZXCT1021E5TA.pdf
- Description:
- IC CURRENT MONITOR 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,832
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Product details
Overview
ZXCT1021E5TA from Diodes Incorporated is a precision high-side current sense monitor with fixed 10× voltage gain, 25µA quiescent current, and ±2% accuracy at 100mV sense voltage. It operates from 2.5V to 20V supply and delivers rail-to-rail output referenced to ground, enabling accurate load-current monitoring in battery-powered DC motor controls without ground-plane disruption.
For engineers reviewing the ZXCT1021E5TA datasheet, ZXCT1021E5TA pinout, ZXCT1021E5TA application, or ZXCT1021E5TA equivalent, key selection criteria include its low 10mV minimum detectable sense voltage, SOT25 footprint compatibility, 300kHz–2MHz bandwidth scalability with input amplitude, and absence of external scaling resistors.
Technical Context
The ZXCT1021E5TA implements a high-side sensing architecture using matched internal transistors to reject common-mode voltage up to 20V while maintaining 50–300ppm/°C output temperature coefficient. Its differential input stage draws only 100nA bias current at VSENSE pins, minimizing shunt resistor error.
Output is a buffered, high-impedance voltage (ROUT = 10–20kΩ) scaled precisely by 10× VSENSE, with no phase inversion or signal conditioning required. The device achieves 3% total accuracy down to 10mV sense voltage due to sub-100µV offset voltage and minimal gain drift over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.5V to 20V - supports wide-input industrial and battery systems without level-shifting |
| Gain | 10 V/V (±2%) - eliminates need for external gain-setting resistors; direct VOUT = 10 × VSENSE |
| Accuracy | ±2% at 100mV VSENSE - enables use of small-value, low-power shunts in high-current applications |
| Quiescent Current | 25µA typical - extends runtime in portable and always-on power management circuits |
| Bandwidth | 300kHz @ 10mV, 2MHz @ 100mV - supports dynamic current monitoring in motor commutation and fast overcurrent detection |
| Input Offset | <100µV - ensures reliable measurement down to 10mV sense voltage with 3% error budget |
| Output Impedance | 10–20kΩ - compatible with ADC inputs and op-amp buffers without loading error |
Pinout & Package
SOT25 (5-pin SC-74A) package: 3.0mm × 1.6mm × 1.1mm body, matte tin-plated leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSE+ | High-side supply and positive sense input | Connects to load-side of shunt; withstands up to 20V common-mode voltage |
| VSENSE− | High-impedance negative sense input | Connects to supply-side of shunt; draws ≤100nA, minimizing shunt error |
| GND | Analog ground reference | Output voltage referenced to this pin; must be low-impedance return path |
| VOUT | Gain-scaled output voltage | Delivers 10× VSENSE as single-ended, rail-to-rail signal for ADC or comparator |
| NC | No internal connection | Unbonded pin; electrically isolated - no routing or grounding required |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 10× gain architecture | Removes external resistor network, reducing BOM count and layout sensitivity to parasitic capacitance |
| 25µA quiescent current | Enables integration into ultra-low-power battery fuel gauging and sleep-mode current monitoring |
| 2.5V minimum supply | Operates directly from single-cell Li-ion (2.7–4.2V) or 3.3V logic rails without LDO |
| 100nA VSENSE− input current | Permits use of <5mΩ PCB trace shunts with ≤5% tolerance impact, lowering system cost |
| SOT25 thermal resistance | θJA ≈ 200°C/W - supports 300mW dissipation at +85°C ambient without heatsink |
Applications
| Battery Charger Monitoring | Smart Battery Pack Protection |
|---|---|
Use Scenario: Real-time charge/discharge current tracking in USB-C PD and multi-cell lithium packs. IC Role / Device Role / Timing Role: High-side current monitor interfacing directly to fuel gauge MCU ADC input. Use Value: 10mV minimum sense voltage allows 2mΩ shunt at 5A, reducing power loss to 50mW and thermal drift. | Use Scenario: Overcurrent cutoff during cell balancing and fault-triggered disconnect in BMS. IC Role / Device Role / Timing Role: Fast-response current sensor feeding comparator threshold for <100µs trip latency. Use Value: 2MHz bandwidth at 100mV enables detection of transient short-circuit events before MOSFET failure. |
| DC Motor Control Feedback | Programmable Current Source Calibration |
Use Scenario: Closed-loop torque control in brushed DC motors used in portable power tools. IC Role / Device Role / Timing Role: Analog current feedback element in PID loop with microcontroller PWM driver. Use Value: ±2% accuracy across 2.5–20V supply range ensures consistent torque response regardless of battery SOC. | Use Scenario: Precision setpoint generation in lab-grade programmable loads and LED drivers. IC Role / Device Role / Timing Role: Reference current mirror calibration monitor for DAC-controlled current loops. Use Value: 50ppm/°C TC and sub-100µV offset enable <0.5% full-scale drift over 0–70°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA219BIDR | Integrated 12-bit ADC, I²C interface, ±0.2% gain error; requires 2.7–5.5V supply | Best for digital-output systems needing on-chip conversion; not suitable for analog-loop feedback | Select when system uses I²C and firmware can handle digital calibration; avoid for real-time analog control |
| MAX4080TASA+ | 80V common-mode range, 500kHz BW, ±0.5% gain error; SO8 package, higher IQ (90µA) | Required for >20V bus monitoring (e.g., 48V telecom); larger footprint and higher power draw | Select for industrial 24–48V systems where extended voltage range outweighs size and quiescent penalty |
Compared with INA219BIDR and MAX4080TASA+, the ZXCT1021E5TA offers the lowest quiescent current and smallest footprint for 2.5–20V applications requiring analog output, making it optimal for space-constrained, battery-sensitive designs where external ADC is already present.
Availability
ZXCT1021E5TA is available at Aetrix Electronics and suitable for battery chargers, smart battery packs, DC motor controls, and overcurrent monitors requiring stable component supply and long-term production continuity.
Supply support for ZXCT1021E5TA 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.
The ZXCT1021 belongs to Diodes' precision current sensing product line, engineered specifically for high-side monitoring in portable, automotive, and industrial power systems where ground-path integrity and low-power operation are critical.
FAQ
What is the minimum sense voltage the ZXCT1021E5TA can accurately measure?
The ZXCT1021E5TA achieves ±3% accuracy down to 10mV sense voltage due to its sub-100µV input offset voltage and low noise design. At this level, it resolves currents through a 10mΩ shunt at 1A with usable signal-to-noise ratio, validated per DS33446 Rev. 10–2 electrical characteristics table.
Can the ZXCT1021E5TA be used with a 1.8V supply?
No - the ZXCT1021E5TA has a minimum supply voltage of 2.5V per absolute maximum ratings and electrical characteristics tables. Operation below 2.5V risks output clipping, gain nonlinearity, and undefined behavior; it is not characterized or guaranteed for 1.8V operation.
Is the NC pin on the SOT25 package required to be grounded or left floating?
The NC pin is not internally bonded and carries no electrical function. Per Diodes' marking diagram and package outline, it must remain unconnected - neither grounded nor routed - to avoid mechanical stress or unintended coupling in high-density layouts.
How does the ZXCT1021E5TA handle reverse polarity or negative VSENSE conditions?
The ZXCT1021E5TA is not rated for reverse VSENSE (VSENSE− > VSENSE+). Absolute maximum ratings specify VSENSE must stay within –0.6V to VIN + 0.5V. Reverse polarity causes undefined output and may damage the input stage; external clamping diodes are required for bidirectional current sensing.
ZXCT1021E5TA 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-Side
- Accuracy:
- ±1%
- Voltage - Input:
- 2.5V ~ 20V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ZXCT1021E5TA FAQ
1.How can I place an order for ZXCT1021E5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXCT1021E5TA 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 ZXCT1021E5TA reliable?
The price and inventory of ZXCT1021E5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXCT1021E5TA is usually 5 days.
3.What payment methods are accepted for ZXCT1021E5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXCT1021E5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXCT1021E5TA?
ZXCT1021E5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXCT1021E5TA 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 ZXCT1021E5TA?
For technical support, including ZXCT1021E5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXCT1021E5TA requirements.
6.How does Aetrix verify that ZXCT1021E5TA is sourced from the original manufacturer or authorized distributors?
All ZXCT1021E5TA 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 ZXCT1021E5TA meets industry standards.
7.What is the process for return or replacement of ZXCT1021E5TA?
All ZXCT1021E5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXCT1021E5TA, 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 ZXCT1021E5TA part is unused and in its original packaging.
Return procedure for ZXCT1021E5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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