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Diodes Incorporated ZXCT1081QE5TA
- Part No.:
- ZXCT1081QE5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ZXCT1081QE5TA.pdf
- Description:
- IC CURRENT MONITOR 3% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:5,614
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Product details
Overview
ZXCT1081QE5TA from Diodes Incorporated is an automotive-grade high-side current monitor IC in SOT25 package, delivering fixed 10× voltage output scaling for differential sense voltages up to 150 mV, with 3 V to 40 V continuous common-mode input range and AEC-Q100 Grade 1 qualification for under-hood applications.
For engineers reviewing the ZXCT1081QE5TA datasheet, ZXCT1081QE5TA pinout, ZXCT1081QE5TA application, or ZXCT1081QE5TA equivalent, key selection criteria include its 40 V high-side voltage rating, 10× gain accuracy (±0.5% typ), -40°C to +125°C operation, and independent VCC supply enabling functionality during load short-circuit events.
Technical Context
The ZXCT1081QE5TA implements a unidirectional, single-supply high-side current sensing architecture using an internal voltage-to-current converter followed by a MOSFET-based current-to-voltage stage and unity-gain output buffer. Its design eliminates ground-plane disruption by measuring current upstream of the load.
It features separate S+ and S− inputs for differential sense voltage (VSENSE), a dedicated VCC pin (4.5–12 V) decoupled from the high-side rail, and an nMOS source-follower output stage biased with 20 μA to ground-enabling rail-to-rail output swing up to 1.5 V while maintaining monotonicity down to 0 mV VSENSE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Common-Mode Input Range | 3 V to 40 V continuous - supports 12 V/24 V/36 V automotive systems with load-dump immunity up to 65 V transient. |
| Fixed Gain | 10.0 ±0.05 V/V (typ) - enables direct conversion of 100 mV VSENSE to 1.00 V output, simplifying ADC interface without external gain stages. |
| VSENSE Linear Range | 10 mV to 150 mV - ensures full linearity and specified offset error (VO(10) ≤ ±30 mV); operation below 10 mV remains monotonic but non-linear. |
| Supply Current (VCC) | 80 μA (typ) at +25°C - enables low-power always-on monitoring in battery-sensitive systems such as body control modules. |
| Output Voltage Range | 0 V to 1.5 V - compatible with 1.8 V/3.3 V ADC reference rails; avoids clipping when VSENSE ≤ 150 mV. |
| CMRR | 75 dB (min) at 40 V common-mode - suppresses noise coupling from high-voltage transients in engine bay environments. |
| Bandwidth | 500 kHz (-3 dB) - supports fast overcurrent detection for motor drivers and solenoid control loops. |
Pinout & Package
Package: SOT25 (5-pin, surface-mount, lead-free, RoHS-compliant). Dimensions per Diodes Package Outline SOT25: 2.80 mm × 2.90 mm × 1.10 mm (L × W × H), 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Analog supply input | Independent 4.5–12 V supply enabling continued operation even if high-side rail collapses (e.g., during short-circuit). |
| 2 - GND | Analog ground reference | Return path for internal bias and output buffer; must be connected to system analog ground, not power ground. |
| 3 - OUT | Voltage output terminal | nMOS source-follower output with 20 μA pull-down; delivers 10× VSENSE with 1.5 V max swing and 20 µA sink capability. |
| 4 - S+ | High-side sense positive input | Connects to load side of sense resistor; withstands 40 V continuous, 65 V transient common-mode voltage. |
| 5 - S− | High-side sense negative input | Connects to supply side of sense resistor; forms differential pair with S+; defines VSENSE = VS+ − VS−. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +125°C), PPAP-capable, manufactured in IATF 16949-certified facilities. |
| High-side sensing architecture | Eliminates ground-loop disruption and preserves system ground integrity-critical for EMI-sensitive infotainment and ADAS subsystems. |
| Transient overvoltage tolerance | Withstands 65 V transients on S+/S− pins-meets ISO 7637-2 Pulse 5a requirements for 12 V/24 V vehicle networks. |
| Low quiescent current | 27 μA IS+ input current and 80 μA VCC supply current enable use in always-on battery monitoring circuits without excessive drain. |
| Fixed precision gain | 10.0 V/V gain with ±0.2% total output error (−40°C to +125°C) - removes need for calibration or trimming in production. |
Applications
| Engine Control Unit (ECU) Load Monitoring | Electric Power Steering (EPS) Motor Current Sensing |
|---|---|
|
Use Scenario: Real-time measurement of fuel injector or ignition coil current in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: High-side current monitor providing isolated, ground-referenced analog output proportional to load current. Use Value: Enables closed-loop current regulation and fault detection (e.g., open/shorted injector) without compromising chassis ground integrity. |
Use Scenario: Continuous monitoring of three-phase motor phase currents in EPS systems. IC Role / Device Role / Timing Role: Unidirectional high-side sense amplifier feeding MCU ADC for torque estimation and overcurrent shutdown. Use Value: Supports ASIL-B functional safety requirements via accurate 500 kHz bandwidth response and AEC-Q100 qualification. |
| Body Control Module (BCM) Fuse Monitoring | Battery Disconnect Unit (BDU) Current Verification |
|
Use Scenario: Detecting fuse degradation or overload in lighting, HVAC, and window lift circuits. IC Role / Device Role / Timing Role: Fixed-gain analog current sensor interfacing to 12-bit internal ADC of 32-bit microcontroller. Use Value: Delivers 10 mV resolution at 100 A full-scale (with 1 mΩ shunt), enabling early warning of incipient failures before thermal runaway. |
Use Scenario: Verifying pre-charge and main contactor current during high-voltage battery engagement in 48 V mild-hybrid systems. IC Role / Device Role / Timing Role: High-side monitor on 40 V auxiliary bus, reporting to BMS controller via isolated analog channel. Use Value: Ensures safe sequencing by confirming <100 mA pre-charge current before main contactor closure, preventing arcing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXCT1082QE5TA | 40 V common-mode range, 20× gain, same SOT25 package and pinout. | Higher gain improves resolution for low-current sensing (e.g., sleep-mode leakage), but reduces full-scale range to 75 mV VSENSE. | Select when >100 mV full-scale VSENSE is unnecessary and higher signal-to-noise ratio is prioritized. |
| INA240A1QDRQ1 | Bi-directional sensing, 20×/50×/100× selectable gain, SOIC-8 package, 80 V common-mode. | Supports reverse current detection (e.g., regenerative braking) and wider voltage range, but requires external gain configuration and larger footprint. | Choose for bi-directional applications or where 80 V transient immunity is mandatory beyond ZXCT1081Q's 65 V rating. |
Compared with ZXCT1081QE5TA, ZXCT1082QE5TA offers doubled gain at identical voltage range and form factor-ideal for precision low-current monitoring-while INA240A1QDRQ1 adds bidirectionality and higher common-mode tolerance at the cost of complexity and board area.
Availability
ZXCT1081QE5TA is available at Aetrix Electronics and suitable for automotive engine control units, electric power steering systems, and battery disconnect units requiring stable component supply across extended temperature and voltage stress conditions.
Supply support for ZXCT1081QE5TA 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 ZXCT108xQ series is part of Diodes' Automotive Sensing portfolio, engineered specifically for robust, high-side current monitoring in harsh-temperature, high-transient environments such as engine compartments and battery management systems.
FAQ
Can ZXCT1081QE5TA measure bidirectional current?
No. The ZXCT1081QE5TA is a unidirectional high-side current monitor optimized for positive-load current only. Its internal architecture produces a strictly positive output voltage proportional to VSENSE = VS+ − VS−, with no capability to resolve polarity reversal. For bidirectional sensing, consider the INA240A1QDRQ1 or ZXCT1083Q.
What is the maximum recommended sense resistor value for 100 A full-scale measurement?
At 100 A full-scale and 150 mV maximum linear VSENSE, the maximum recommended sense resistor is 1.5 mΩ (150 mV ÷ 100 A). Using a 1 mΩ shunt yields 100 mV at 100 A, aligning with the device's optimal 100 mV operating point and minimizing self-heating and power loss (10 W at 100 A).
Does ZXCT1081QE5TA require external compensation components?
No external compensation is required for stability. The device is internally compensated for unity-gain operation and maintains phase margin across its full 500 kHz bandwidth. However, a 10 pF capacitor (CD) is recommended between S− and load when using RLIM for transient protection, per Figure 21 in DS37012.
Is ZXCT1081QE5TA pin-compatible with ZXCT1080QE5TA?
Yes-both share identical SOT25 pinout, pin functions, and package dimensions. The only functional difference is the maximum continuous common-mode voltage: ZXCT1080Q supports 60 V, while ZXCT1081Q supports 40 V. Substitution is electrically safe if the application's high-side rail stays ≤40 V.
ZXCT1081QE5TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Function:
- Current Monitor
- Sensing Method:
- High-Side
- Accuracy:
- ±3%
- Voltage - Input:
- 3V ~ 40V
- Current - Output:
- 1mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
ZXCT1081QE5TA FAQ
1.How can I place an order for ZXCT1081QE5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXCT1081QE5TA 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 ZXCT1081QE5TA reliable?
The price and inventory of ZXCT1081QE5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXCT1081QE5TA is usually 5 days.
3.What payment methods are accepted for ZXCT1081QE5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXCT1081QE5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXCT1081QE5TA?
ZXCT1081QE5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXCT1081QE5TA 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 ZXCT1081QE5TA?
For technical support, including ZXCT1081QE5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXCT1081QE5TA requirements.
6.How does Aetrix verify that ZXCT1081QE5TA is sourced from the original manufacturer or authorized distributors?
All ZXCT1081QE5TA 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 ZXCT1081QE5TA meets industry standards.
7.What is the process for return or replacement of ZXCT1081QE5TA?
All ZXCT1081QE5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXCT1081QE5TA, 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 ZXCT1081QE5TA part is unused and in its original packaging.
Return procedure for ZXCT1081QE5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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