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Diodes Incorporated ZXCT1109QSA-7
- Part No.:
- ZXCT1109QSA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Current Regulation/Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXCT1109QSA-7.pdf
- Description:
- IC CURRENT MONITOR SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,797
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Product details
Overview
ZXCT1109QSA-7 from Diodes Incorporated is an automotive-grade, high-side unipolar current sense monitor in SOT25 package. It delivers 4 mA/V transconductance with ±1.8% gain accuracy, 3 µA quiescent current, and operates over 2.5 V to 36 V common-mode input range. Used for real-time load current monitoring in battery management and overcurrent protection circuits without ground-plane disruption.
For engineers reviewing the ZXCT1109QSA-7 datasheet, ZXCT1109QSA-7 pinout, ZXCT1109QSA-7 application, or ZXCT1109QSA-7 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, SOT25 5-pin layout, output current linearity (10–500 mV VSENSE), low-offset performance, and compatibility with external RGAIN resistor-based voltage conversion for MCU ADC interfacing.
Technical Context
The ZXCT1109QSA-7 uses a high-side sensing architecture with S+ as both analog supply and positive input, eliminating ground-path interruption. Its internal transconductance amplifier converts differential sense voltage (VS+ − VS−) into a proportional output current, with no external supply required beyond the sensed rail.
It features a dedicated GND pin (Pin 2) and NC terminal (Pin 1), distinguishing it from the 3-pin ZXCT1107Q. The device maintains linear operation across −40°C to +125°C, with CMRR > 60 dB at 1 kHz and small-signal bandwidth of 0.65 MHz when RGAIN = 2.5 kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transconductance | 4.0 mA/V ±1.8% - defines precise IOUT = 4×VSENSE scaling for accurate current-to-voltage conversion |
| Quiescent Current | 3 µA - minimizes measurement error and enables ultra-low-power automotive always-on monitoring |
| Common-Mode Range | 2.5 V to 36 V - supports direct integration into 12 V/24 V vehicle power rails without level-shifting |
| Operating Temperature | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and battery-pack environments |
| Differential Input Range | 0 to 0.5 V (linear 10–500 mV) - sets usable RSENSE sizing window for <1% power loss and ≥10 µA detectable output |
| Output Offset Current | ±4 µA at VSENSE = 10 mV - establishes baseline error floor for low-current detection thresholds |
| Small-Signal Bandwidth | 0.65 MHz - enables response to fast load transients (e.g., motor startup, solenoid actuation) |
Pinout & Package
SOT25-5 package: compact surface-mount outline with exposed pad for thermal dissipation; footprint compatible with automated PCB assembly and reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 3) | Current output terminal | Delivers scaled output current (IOUT = 4×VSENSE); connects to RGAIN for voltage conversion before ADC/comparator |
| S− (Pin 2) | Negative sense input | High-impedance node referenced to load return path; accepts up to 36 V common-mode voltage |
| S+ (Pin 4) | Positive sense input & analog supply | Provides internal biasing power; carries load current plus sense current-requires low-impedance routing |
| GND (Pin 2) | Ground reference & substrate connection | Separate low-noise return path improves PSRR and reduces offset drift vs. shared S−/GND designs |
| NC (Pin 1) | No-connect terminal | Unbonded die pad; must remain floating per datasheet-no trace or solder mask opening required |
Key Features
| Feature | Design Value |
|---|---|
| Line-powered operation | Draws power solely from sensed rail (S+), eliminating need for auxiliary supply and reducing BOM count |
| AEC-Q100 Grade 1 qualification | Validated for automotive use up to +125°C ambient, supporting PPAP documentation and long-term reliability in safety-critical systems |
| Low-offset current output | ±4 µA output offset at 10 mV VSENSE enables reliable detection of sub-2.5 A loads with 50 mΩ RSENSE |
| Wide common-mode rejection | 0.1–0.4 µA/V CMSR ensures stable output despite battery voltage ripple or alternator noise up to 36 V |
| Thermal stability | 370 ppm/°C IOUT temperature coefficient maintains calibration across engine bay thermal cycles |
Applications
| Automotive Battery Monitoring | EV Onboard Charger Protection |
|---|---|
|
Use Scenario: Real-time monitoring of 12 V lead-acid or 48 V Li-ion battery discharge/charge current in start-stop systems. IC Role / Device Role / Timing Role: High-side current sensor providing isolated analog feedback to battery management unit (BMU) without compromising ground integrity. Use Value: Enables accurate state-of-charge estimation and thermal derating control using only 3 µA quiescent draw-critical for low-leakage sleep modes. |
Use Scenario: Overcurrent detection during AC/DC conversion in 6.6 kW OBC modules, triggering shutdown before MOSFET failure. IC Role / Device Role / Timing Role: Fast-response current monitor feeding comparator input to initiate hardware-level fault cutoff within <10 µs. Use Value: 0.65 MHz bandwidth and 10–500 mV linear range support detection of 50 A surge events with <1% gain error at 125°C junction temperature. |
| Commercial Vehicle Lighting Control | ADAS Power Rail Supervision |
|
Use Scenario: LED headlamp driver current regulation and open-circuit fault detection in Class 8 truck lighting systems. IC Role / Device Role / Timing Role: Unidirectional high-side monitor interfaced to microcontroller ADC via RGAIN resistor for closed-loop dimming control. Use Value: 2.5–36 V common-mode range accommodates wide input variation during cold-crank (6.5 V) and load-dump (36 V) conditions without external clamping. |
Use Scenario: Continuous supervision of radar/LiDAR module supply current to detect early-stage short-circuit degradation. IC Role / Device Role / Timing Role: Precision current telemetry source feeding diagnostic firmware that logs cumulative current deviation trends. Use Value: ±1.8% transconductance accuracy and −40°C to +125°C operation ensure consistent fault threshold behavior across full vehicle operating envelope. |
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 |
|---|---|---|---|
| MAX40056ATA+T | Higher 10 µA IQ; 2.7–36 V supply; integrated 10-bit ADC; SPI interface | Replaces discrete signal chain (ZXCT1109Q + external ADC); adds digital diagnostics but increases cost and layout complexity | Select when system requires embedded current logging or configurable alert thresholds without MCU intervention |
| INA282AIDR | Voltage-output architecture; 10 V/V fixed gain; 1.2 mA IQ; SOIC-8 package | Requires separate VCC supply; higher power draw limits use in always-on modules; larger footprint than SOT25 | Select when existing design uses voltage-output sensors and board space allows SOIC-8; avoid for ultra-low-IQ or SMT-constrained layouts |
Compared with MAX40056ATA+T and INA282AIDR, the ZXCT1109QSA-7 offers the lowest quiescent current and smallest footprint for analog-output high-side sensing, making it optimal for space- and power-constrained automotive subsystems where simplicity and AEC-Q100 compliance are primary drivers.
Availability
ZXCT1109QSA-7 is available at Aetrix Electronics and suitable for automotive battery management, EV onboard charger protection, and ADAS power rail supervision requiring stable component supply across extended temperature and lifecycle demands.
Supply support for ZXCT1109QSA-7 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 ISO/TS 16949-certified operations.
The ZXCT1109QSA-7 belongs to Diodes' AEC-Q100-qualified current sense monitor product line, engineered specifically for robust, high-accuracy current measurement in harsh automotive environments where ground isolation and low power are critical.
FAQ
What is the minimum sense voltage for reliable linear operation?
The ZXCT1109QSA-7 operates linearly from 10 mV to 500 mV VSENSE. Below 10 mV, output current is not guaranteed and may fall to zero due to internal offset effects. For accurate low-current detection, design RSENSE to ensure ≥10 mV drop at the minimum load current of interest.
Can ZXCT1109QSA-7 be used in low-side sensing configurations?
No-it is designed exclusively for high-side sensing. Its architecture relies on S+ as the analog supply and common-mode reference; connecting S+ to ground violates absolute maximum ratings and will damage the device. Use dedicated low-side monitors like ZXCT1009 for ground-referenced applications.
How does the NC pin (Pin 1) affect PCB layout?
Pin 1 is internally unconnected and must remain electrically floating. Do not route traces to it or apply solder mask openings. Leaving it unconnected avoids parasitic coupling and ensures specified ESD performance (1,500 V HBM). Thermal relief to copper pour is permitted for mechanical stability only.
Is external filtering required on the OUT pin?
A 1 nF ceramic capacitor between OUT and GND is recommended to suppress high-frequency noise from switching loads. Larger capacitors (>10 nF) degrade bandwidth and may cause instability with certain RGAIN values; verify pulse response in final layout using the test circuit in DS37002 Rev. 3–2 Figure 9.
ZXCT1109QSA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Monitor
- Sensing Method:
- High-Side
- Accuracy:
- -
- Voltage - Input:
- 2.5V ~ 36V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ZXCT1109QSA-7 FAQ
1.How can I place an order for ZXCT1109QSA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXCT1109QSA-7 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 ZXCT1109QSA-7 reliable?
The price and inventory of ZXCT1109QSA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXCT1109QSA-7 is usually 5 days.
3.What payment methods are accepted for ZXCT1109QSA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXCT1109QSA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXCT1109QSA-7?
ZXCT1109QSA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXCT1109QSA-7 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 ZXCT1109QSA-7?
For technical support, including ZXCT1109QSA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXCT1109QSA-7 requirements.
6.How does Aetrix verify that ZXCT1109QSA-7 is sourced from the original manufacturer or authorized distributors?
All ZXCT1109QSA-7 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 ZXCT1109QSA-7 meets industry standards.
7.What is the process for return or replacement of ZXCT1109QSA-7?
All ZXCT1109QSA-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXCT1109QSA-7, 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 ZXCT1109QSA-7 part is unused and in its original packaging.
Return procedure for ZXCT1109QSA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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