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Diodes Incorporated ZXCT1008QFTA
- Part No.:
- ZXCT1008QFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Current Regulation/Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXCT1008QFTA.pdf
- Description:
- IC CURRENT MONITOR 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,479
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Product details
Overview
ZXCT1008QFTA from Diodes Incorporated is an AEC-Q100 Grade 1 qualified automotive high-side current monitor IC in SOT23 (Type DN) package. It converts differential shunt voltage (0–500 mV) into a proportional output current (up to 5.2 mA), operates from 2.5 V to 20 V supply, delivers 1% typical accuracy, and supports -40°C to +125°C ambient operation - used for DC motor stall detection and overcurrent monitoring in 12 V/24 V automotive power distribution systems.
For engineers reviewing the ZXCT1008QFTA datasheet, ZXCT1008QFTA pinout, ZXCT1008QFTA application, or ZXCT1008QFTA equivalent, this page provides verified functional context, validated pin roles, confirmed automotive-grade operating limits, and real-world design implications for high-side sensing in transient-rich environments.
Technical Context
The ZXCT1008QFTA implements a fixed transconductance architecture (10,000 µA/V) that linearly converts sensed differential voltage (VSENSE = VSENSE+ − VSENSE−) into output current (IOUT), independent of supply voltage. Its input stage withstands reverse polarity and load-dump transients up to 20 V, with ±100 nA VSENSE− input bias current enabling low-error measurement across RSENSE values down to ~0.1 Ω.
No internal voltage reference or amplifier gain-setting resistors are required - scaling to ground-referenced voltage is achieved externally via ROUT. The device exhibits 300 kHz small-signal bandwidth at 10 mV input and maintains stable operation under RF interference (−40 dBm), making it suitable for noisy automotive subsystems without additional filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.5 V to 20 V - supports direct connection to 12 V/24 V battery rails without external regulators. |
| Sense Voltage Range | 0 mV to 500 mV - enables use with low-value shunts (e.g., 0.1 Ω at 5 A) minimizing power loss and thermal drift. |
| Transconductance | 10,000 µA/V - delivers precise IOUT scaling: 100 mV sense → 1.0 mA output, simplifying ROUT selection for target VOUT. |
| Accuracy | ±2.5% max (−2.5% to +2.5%) - specified at VSENSE = 200 mV, ensuring reliable trip-point setting for overcurrent protection. |
| Quiescent Current | 4 µA - enables always-on monitoring in low-power vehicle modules without significant battery drain. |
| Operating Temp | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and powertrain applications. |
| ESD Rating | HBM: 2 kV - provides robustness against handling and assembly ESD events in production environments. |
Pinout & Package
SOT23 (Type DN) package: 3-pin surface-mount, 2.8 mm × 2.4 mm footprint, 0.95 mm pitch, matte tin-plated leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSE+ | High-side shunt connection (positive terminal) | Connects to supply rail side of current shunt; referenced to VSENSE− to define differential sense voltage. |
| VSENSE− | High-side shunt connection (negative terminal) | Connects to load side of shunt; input bias current ≤100 nA minimizes error in low-RSENSE designs. |
| IOUT | Current output terminal | Sinks proportional current (IOUT = VSENSE × 10 mA/V); requires external ROUT to ground for voltage translation. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1, PPAP-capable, manufactured in IATF 16949-certified facilities - ensures traceability and process control for OEM programs. |
| Transient tolerance | Withstands 20 V continuous pin voltage and reverse-polarity connection - eliminates need for external protection diodes in basic implementations. |
| Low-power operation | 4 µA quiescent current enables integration into always-on vehicle subsystems (e.g., body control modules) without compromising battery life. |
| Ground-referenced output flexibility | Output current drives external ROUT to generate scalable, isolated voltage output - avoids ground-loop errors common in low-side sensing. |
Applications
| Automotive Battery Monitoring | DC Motor Stall Detection |
|---|---|
|
Use Scenario: Real-time monitoring of starter battery charge/discharge current in 12 V vehicle networks. IC Role / Device Role / Timing Role: High-side current monitor providing isolated, ground-referenced analog signal to microcontroller ADC input. Use Value: Enables accurate state-of-charge estimation and load shedding decisions without disrupting chassis ground integrity. |
Use Scenario: Detecting stalled condition in HVAC blower motors during cold cranking or ice-blocked vents. IC Role / Device Role / Timing Role: Translates motor current surge (≥2× nominal) into fast-rising IOUT for immediate MCU-triggered shutdown. Use Value: Prevents thermal damage by responding within <1 ms to overcurrent events, leveraging 300 kHz bandwidth. |
| Automotive Lighting Control | Onboard Charger Protection |
|
Use Scenario: Monitoring LED headlamp array current to detect open-circuit or short-circuit faults. IC Role / Device Role / Timing Role: High-side sense element feeding fault logic in lighting control unit (LCU) with minimal PCB area. Use Value: Supports compact SOT23 placement adjacent to LED driver FETs, reducing parasitic inductance and noise coupling. |
Use Scenario: Protecting 12 V onboard chargers from overcurrent during lithium battery charging cycles. IC Role / Device Role / Timing Role: Current monitor in high-side path between alternator and charger input, interfacing with protection controller. Use Value: Maintains accuracy across wide temperature range (−40°C to +125°C), critical for under-hood charger mounting locations. |
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 |
|---|---|---|---|
| MAX40056ATA+T | Higher accuracy (±0.5%), integrated 10-bit ADC, SPI interface; requires 3.3 V supply only. | Targets digital-output systems needing local digitization; not drop-in compatible due to different pinout and digital interface. | Select when system-level digitization and tighter accuracy outweigh cost and complexity trade-offs. |
| INA219BIDR | Bi-directional sensing, I²C interface, internal 12-bit ADC; 2.7–5.5 V supply range only. | Designed for low-voltage embedded systems (e.g., infotainment); lacks automotive qualification and high-voltage tolerance. | Choose for non-automotive, low-voltage, bi-directional monitoring where digital bus integration is prioritized. |
Compared with MAX40056ATA+T and INA219BIDR, the ZXCT1008QFTA offers automotive-grade ruggedness, wide 2.5–20 V operation, and analog simplicity - making it optimal for cost-sensitive, high-reliability analog feedback loops in 12 V/24 V power domains.
Availability
ZXCT1008QFTA is available at Aetrix Electronics and suitable for automotive battery management, DC motor protection, and lighting control systems requiring stable component supply across extended temperature ranges and high-transient environments.
Supply support for ZXCT1008QFTA 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 ZXCT1008QFTA belongs to Diodes' automotive-qualified current sensing portfolio, designed specifically for robust, low-cost high-side monitoring in harsh-temperature and high-voltage transient environments.
FAQ
What is the maximum allowable sense voltage for ZXCT1008QFTA?
The ZXCT1008QFTA supports a continuous differential sense voltage (VSENSE = VSENSE+ − VSENSE−) from 0 mV to 500 mV, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. Exceeding 500 mV may cause output saturation or reduced linearity, and operation beyond −0.5 mV or above +500 mV is outside guaranteed specification.
Can ZXCT1008QFTA be used with a 24 V truck battery system?
Yes - the ZXCT1008QFTA's 2.5 V to 20 V supply range and ability to withstand 20 V on any pin (including VSENSE+ and VSENSE−) make it compatible with 24 V nominal systems during normal operation. For load-dump transients exceeding 20 V, external clamping (e.g., Zener Z1 per datasheet Figure 1) is required to protect the IOUT pin.
How does the 4 µA quiescent current impact system-level power budget?
At 4 µA, the ZXCT1008QFTA draws just 12 µW from a 3 V supply or 80 µW from a 20 V supply - negligible in automotive always-on circuits. This enables permanent installation in battery-monitoring paths without measurable impact on standby current, supporting >1-year key-off battery life in modern vehicles.
Is a minimum output resistor (ROUT) required for stable operation?
No minimum ROUT is required for stability - the ZXCT1008QFTA sinks current inherently and remains stable with open-circuit IOUT. However, ROUT must be selected to convert IOUT into a usable voltage (e.g., 1 kΩ yields 1 V at 100 mV sense). Values below ~10 Ω risk excessive power dissipation in ROUT without improving performance.
ZXCT1008QFTA 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:
- ±1%
- Voltage - Input:
- 2.5V ~ 20V
- Current - Output:
- 25mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ZXCT1008QFTA FAQ
1.How can I place an order for ZXCT1008QFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXCT1008QFTA 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 ZXCT1008QFTA reliable?
The price and inventory of ZXCT1008QFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXCT1008QFTA is usually 5 days.
3.What payment methods are accepted for ZXCT1008QFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXCT1008QFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXCT1008QFTA?
ZXCT1008QFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXCT1008QFTA 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 ZXCT1008QFTA?
For technical support, including ZXCT1008QFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXCT1008QFTA requirements.
6.How does Aetrix verify that ZXCT1008QFTA is sourced from the original manufacturer or authorized distributors?
All ZXCT1008QFTA 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 ZXCT1008QFTA meets industry standards.
7.What is the process for return or replacement of ZXCT1008QFTA?
All ZXCT1008QFTA units undergo pre-shipment inspection (PSI). If there is an issue with ZXCT1008QFTA, 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 ZXCT1008QFTA part is unused and in its original packaging.
Return procedure for ZXCT1008QFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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