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Diodes Incorporated ZXCT1085QE5TA
- Part No.:
- ZXCT1085QE5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ZXCT1085QE5TA.pdf
- Description:
- IC CURRENT MONITOR 2% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:1,935
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Product details
Overview
ZXCT1085QE5TA from Diodes Incorporated is an automotive-grade, high-side unipolar current sense monitor in SOT25 package, delivering fixed 25× voltage gain (VOUT = 25 × VSENSE), 40V max common-mode input range, ±0.2 mV input offset voltage, and 0.6 µA quiescent current for precision battery management in 12V/24V automotive systems.
For engineers reviewing the ZXCT1085QE5TA datasheet, ZXCT1085QE5TA pinout, ZXCT1085QE5TA application, or ZXCT1085QE5TA equivalent, this device supports AEC-Q100 Grade 1 qualification, operates from −40°C to +125°C, offers 500 kHz small-signal bandwidth at G = 25, and provides high CMRR (≥80 dB) and PSRR (≥80 dB) critical for noisy vehicle electrical environments.
Technical Context
The ZXCT1085QE5TA implements a precision current-to-voltage conversion architecture with fully differential input stage referenced to S+ and S− terminals, enabling accurate sensing without ground-plane disruption. Its internal amplifier delivers fixed 25 V/V gain with <±1% gain error over temperature and supply variation.
It features independent supply (VCC) and common-mode input (VS+) rails-VCC operates from 2.7V to 40V while VS+ accepts up to 40V-enabling operation across automotive battery transients. Input bias currents remain ≤5 µA across −40°C to +125°C, minimizing sense-resistor error contribution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 25 V/V output gain - enables direct interface to 12-bit ADCs with 100 mV sense voltage yielding 2.5 V full-scale output. |
| Common-Mode Input Range | 2.7 V to 40 V - supports monitoring of loads connected to 12 V, 24 V, and 36 V automotive rails including cold-crank and load-dump conditions. |
| Input Offset Voltage | ±0.2 mV (typ), ±2.5 mV (max) - ensures ≤0.2% full-scale error at 100 mV VSENSE, critical for low-current detection in battery leakage monitoring. |
| Quiescent Current | 0.6 µA (typ), 2 µA (max) - minimizes parasitic loading on sense resistor and preserves system efficiency in always-on modules. |
| Small-Signal Bandwidth | 500 kHz at G = 25 - supports real-time overcurrent detection for fast-acting protection in motor drivers and lighting control. |
| CMRR / PSRR | ≥80 dB (min) - rejects common-mode noise from alternator ripple and switching transients, maintaining accuracy in harsh EMI environments. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood and powertrain applications per AEC-Q100 Grade 1 requirements. |
Pinout & Package
SOT25 (5-pin SC-74A) package with exposed pad for thermal enhancement; RoHS-compliant, halogen-free, lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Voltage output terminal | Delivers amplified VSENSE × 25; rail-to-rail swing limited to VS− − 1 V, compatible with standard analog inputs. |
| 2 GND | Analog ground reference | Provides return path for internal circuitry; must be tied to system ground near sense resistor to avoid ground-loop errors. |
| 3 S+ | Positive current-sense input | Connects directly to VSUPPLY side of sense resistor; supports up to 40 V common-mode voltage with minimal input current (≤5 µA). |
| 4 S− | Negative current-sense input | Connects directly to VLOAD side of sense resistor; forms differential pair with S+ to reject common-mode noise. |
| 5 VCC | Analog supply input | Power source for internal amplifier; decoupling capacitor required; independent of S+/S− rails for flexible system integration. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use with PPAP support, ensuring reliability in safety-critical battery monitoring and power distribution systems. |
| Fixed 25× gain architecture | Eliminates external gain-setting resistors, reducing BOM count and PCB area while guaranteeing consistent transfer function across production lots. |
| Ultra-low quiescent current | 0.6 µA typical draw enables deployment in always-on subsystems (e.g., smart junction boxes) without compromising battery standby life. |
| High CMRR and PSRR | ≥80 dB rejection of alternator noise and supply ripple ensures stable output during engine cranking and load dump events. |
| Wide common-mode input range | 2.7 V to 40 V operation accommodates 12 V nominal systems with ±25 % tolerance and transient surges up to ISO 7637-2 Pulse 5a. |
Applications
| Automotive Battery Monitoring | Engine Control Unit (ECU) Power Rail Sensing |
|---|---|
|
Use Scenario: Continuous monitoring of 12 V battery leakage current during vehicle sleep mode to detect parasitic drain exceeding 50 µA. IC Role / Device Role / Timing Role: High-side current monitor converting microamp-level sense voltage into clean, amplified analog output for MCU ADC sampling. Use Value: Enables accurate sub-100 µA current resolution using standard 10 mΩ shunt and 12-bit ADC, meeting OEM battery health diagnostics requirements. |
Use Scenario: Real-time measurement of ECU main power rail current to detect short-circuit faults before fuse activation. IC Role / Device Role / Timing Role: Fast-response current sensor feeding overcurrent logic in safety-critical power management subsystems. Use Value: 500 kHz bandwidth allows detection of 2 µs fault transients, supporting ASIL-B compliant diagnostic coverage per ISO 26262. |
| Electric Power Steering (EPS) Motor Phase Current | LED Headlamp Driver Current Regulation |
|
Use Scenario: High-side sensing of H-bridge phase current in EPS motor control to enable torque estimation and field-oriented control. IC Role / Device Role / Timing Role: Precision analog front-end providing isolated current feedback signal to motor controller PWM timing loop. Use Value: ±0.2 mV offset enables <0.5% gain error at 200 mV sense voltage, improving torque linearity and reducing steering assist jitter. |
Use Scenario: Monitoring LED string current in adaptive driving beam (ADB) headlamps to maintain constant luminance across voltage and temperature drift. IC Role / Device Role / Timing Role: Stable gain-stage sensor interfacing with closed-loop current regulator IC to suppress thermal droop. Use Value: 100 ppm/K gain TC and −40°C to +125°C operation ensure ±1.5% current regulation accuracy over full ambient range. |
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 |
|---|---|---|---|
| MAX4080TASA+ | Fixed 20 V/V gain, 76 V common-mode range, higher 1.2 mA ICC, SO8 package | Better suited for industrial 48 V systems; less optimal for ultra-low-power automotive sleep modes | Select when wider common-mode range (>40 V) or higher bandwidth (1.5 MHz) is required, accepting higher supply current. |
| TSC1021IYPT | Fixed 20 V/V gain, 60 V common-mode, 1.5 mA ICC, SO8 package, integrated overvoltage protection | Includes built-in clamp diodes for load-dump robustness; larger footprint and higher power dissipation | Prefer when system-level transient protection is prioritized over quiescent current and board space constraints. |
Compared with MAX4080TASA+ and TSC1021IYPT, ZXCT1085QE5TA offers the lowest quiescent current (0.6 µA vs. >1.2 mA) and smallest footprint (SOT25 vs. SO8), making it optimal for space-constrained, always-on automotive modules where power efficiency and PCB area are critical.
Availability
ZXCT1085QE5TA is available at Aetrix Electronics and suitable for automotive battery management, ECU power rail monitoring, and electric power steering systems requiring stable component supply with AEC-Q100 compliance and long-term lifecycle assurance.
Supply support for ZXCT1085QE5TA 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets, with emphasis on high-reliability, AEC-Q100-qualified components.
ZXCT1085QE5TA belongs to Diodes' automotive-qualified high-side current monitor product line, designed specifically for precision, low-power current sensing in 12 V/24 V vehicle electrical architectures under extreme temperature and EMI conditions.
FAQ
What is the maximum allowable common-mode voltage for ZXCT1085QE5TA?
The ZXCT1085QE5TA supports a common-mode input voltage range of 2.7 V to 40 V, meaning S+ and S− terminals can withstand up to 40 V relative to ground. This rating aligns with ISO 16750-2 automotive electrical load-dump specifications and covers 24 V nominal systems with margin.
Can ZXCT1085QE5TA be used with a 3.3 V microcontroller ADC?
Yes. With its 25× fixed gain and 0–0.5 V differential input range, ZXCT1085QE5TA produces a 0–12.5 V output. To interface with a 3.3 V ADC, a simple resistive divider (e.g., 10 kΩ + 3.3 kΩ) scales the output to 0–3.3 V while preserving linearity and maintaining ≥80 dB CMRR via proper layout.
Does ZXCT1085QE5TA require external gain-setting resistors?
No. Unlike the ZXCT1082Q/1083Q variants, ZXCT1085QE5TA integrates fixed 25× gain internally and requires no external transconductance or gain-setting resistors-reducing component count, PCB area, and calibration complexity in production.
How does the device handle reverse battery connection?
ZXCT1085QE5TA has absolute maximum ratings of −0.3 V on S+, S−, and VCC pins. It does not include reverse-polarity protection; external series diode or MOSFET-based protection circuitry must be added if reverse battery exposure is possible in the target application.
ZXCT1085QE5TA 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:
- ±2%
- Voltage - Input:
- 2.7V ~ 40V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
ZXCT1085QE5TA FAQ
1.How can I place an order for ZXCT1085QE5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXCT1085QE5TA 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 ZXCT1085QE5TA reliable?
The price and inventory of ZXCT1085QE5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXCT1085QE5TA is usually 5 days.
3.What payment methods are accepted for ZXCT1085QE5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXCT1085QE5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXCT1085QE5TA?
ZXCT1085QE5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXCT1085QE5TA 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 ZXCT1085QE5TA?
For technical support, including ZXCT1085QE5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXCT1085QE5TA requirements.
6.How does Aetrix verify that ZXCT1085QE5TA is sourced from the original manufacturer or authorized distributors?
All ZXCT1085QE5TA 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 ZXCT1085QE5TA meets industry standards.
7.What is the process for return or replacement of ZXCT1085QE5TA?
All ZXCT1085QE5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXCT1085QE5TA, 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 ZXCT1085QE5TA part is unused and in its original packaging.
Return procedure for ZXCT1085QE5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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