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Diodes Incorporated ZXCT181QA3W6-7
- Part No.:
- ZXCT181QA3W6-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Current Regulation/Management
- Package:
- SOT-23-6
- Datasheet:
-
ZXCT181QA3W6-7.pdf
- Description:
- CM VOLTAGE OUTPUT SOT26 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
ZXCT181QA3W6-7 from Diodes Incorporated is an AEC-Q100 qualified automotive current shunt monitor optimized for bidirectional high-side/low-side sensing with 100V/V fixed gain, 400kHz small-signal bandwidth, ±1% max gain error over −40°C to +125°C, and operation from 2.7V to 5.5V supply - deployed in motor control fault detection and e-pump current monitoring.
For engineers reviewing the ZXCT181QA3W6-7 datasheet, ZXCT181QA3W6-7 pinout, ZXCT181QA3W6-7 application, or ZXCT181QA3W6-7 equivalent, key selection criteria include common-mode range (−0.3V to 26V), rail-to-rail output swing, 300μA max quiescent current, and REF-pin configurable unidirectional/bidirectional operation.
Technical Context
The ZXCT181QA3W6-7 uses a precision current-sense amplifier topology that enables accurate measurement of shunt voltage at common-mode voltages up to 26V - independent of its 2.7V–5.5V supply rail. Its input stage withstands −0.3V to 26V on IN+ and IN− even with VS = 0V.
It supports bidirectional sensing via externally applied reference voltage (0V to VS) on the REF pin, enabling zero-current output offset tuning; unidirectional mode is achieved by grounding REF, with ≥50mV bias recommended for low-current linearity. Gain is fixed at 100V/V with 150kHz bandwidth (CL = 10pF) and 2V/μs slew rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed Gain | 100V/V - provides 100mV output per 1mA across 10mΩ shunt; enables direct interface with 12-bit ADCs at 3.3V full-scale. |
| Common-Mode Range | −0.3V to 26V - supports high-side sensing in 12V/24V automotive systems without level-shifting circuitry. |
| Small-Signal Bandwidth | 150kHz - sufficient for PWM motor current ripple detection up to 20kHz switching frequencies with >5× margin. |
| Offset Voltage (max) | ±400μV - contributes ≤0.4% error at 100mV full-scale output; RTI specification ensures accuracy at low shunt voltages. |
| Quiescent Current | 300μA max - enables always-on current monitoring in battery-powered modules without significant drain. |
| Operating Temperature | −40°C to +125°C - validated for under-hood automotive environments including engine control and body electronics. |
| Gain Error (max) | ±1% over temperature - guarantees consistent scaling across thermal cycling; no calibration required in production. |
Pinout & Package
Package: SOT26 - 6-pin surface-mount package with 1.10mm height, 3.00mm × 2.80mm footprint, and moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Analog output | Rail-to-rail output capable of swinging within 20mV of VS and 0.5mV of GND; drives 10kΩ loads directly into ADC inputs. |
| GND (Pin 2) | Ground reference | Primary return path for internal circuitry and output stage; requires star-ground connection with shunt and ADC for <0.1% error. |
| IN+ (Pin 3) | High-side shunt connection | Connects to supply side of shunt resistor; tolerates −0.3V to 26V regardless of VS state - enables true high-side sensing. |
| IN− (Pin 4) | Low-side shunt connection | Connects to load side of shunt; differential input pair rejects common-mode noise up to 110dB CMRR at DC. |
| REF (Pin 5) | Bidirectional offset control | Accepts 0V to VS voltage to set zero-current output level; 2.5V bias enables symmetric ±2.5V output swing for charging/discharging detection. |
| VS (Pin 6) | Power supply | 2.7V–5.5V supply input; powers internal amplifier and output stage; bypass capacitor (0.1μF) required adjacent to this pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Qualified to Grade 0 (−40°C to +125°C) with PPAP capability and IATF16949 manufacturing - meets automotive functional safety preconditions. |
| Rail-to-rail output | Swings to within 20mV of VS and 0.5mV of GND - maximizes dynamic range for 3.3V or 5V ADC interfaces without external level-shifting. |
| Bi-directional sensing | Configurable via REF pin voltage - eliminates need for dual amplifiers or H-bridge current sense in battery charge/discharge paths. |
| Low quiescent current | 260μA typical at +25°C - enables continuous monitoring in always-on vehicle subsystems (e.g., body control modules) with minimal battery load. |
| High CMRR | 110dB at DC - suppresses noise from high-dV/dt power rails (e.g., motor drivers), preserving signal integrity in noisy automotive environments. |
Applications
| Vehicle Motor Control | Automotive Body Electronics |
|---|---|
|
Use Scenario: Monitoring phase current in 12V BLDC e-pumps for HVAC and power steering. IC Role / Device Role / Timing Role: High-side current sensor feeding real-time feedback to motor controller MCU for commutation timing and overcurrent shutdown. Use Value: 400kHz bandwidth captures PWM ripple; 26V common-mode handles battery transients; ±1% gain error avoids torque miscalculation. |
Use Scenario: Detecting short-circuit faults in door module LED drivers and window lift motors. IC Role / Device Role / Timing Role: Low-side current monitor triggering immediate MCU interrupt on >5A fault current rise within 5μs. Use Value: 2V/μs slew rate enables sub-5μs response to fast faults; 300μA IQ permits integration into always-on wake-up circuits. |
| Wireless Charging Systems | Battery Management Units |
|
Use Scenario: Measuring transmitter coil current during Qi-compliant 15W wireless power transfer. IC Role / Device Role / Timing Role: Bidirectional current monitor with REF = 2.5V to distinguish forward power delivery from reflected fault currents. Use Value: 100V/V gain resolves 10mA changes at 10mΩ shunt; 150kHz bandwidth tracks resonant frequency shifts during foreign object detection. |
Use Scenario: Sensing charge/discharge current in 48V mild-hybrid starter-generator battery packs. IC Role / Device Role / Timing Role: Dual-role shunt monitor - unidirectional for charging (REF = GND), bidirectional for regenerative braking (REF = 2.5V). Use Value: Single device replaces two amplifiers; −0.3V to 26V common-mode accommodates pack voltage swings during transient load dumps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3QDRQ1 | 100V/V gain, 4V/V to 500V/V programmable, 800kHz bandwidth, higher IQ (1.8mA) | Requires external gain-setting resistors; better for wide dynamic range but less integrated than ZXCT181QA3W6-7 | Select when bandwidth >400kHz or programmable gain is needed; avoid if lowest IQ is critical. |
| MAX40056ATA+T | 100V/V gain, 2.7V–5.5V supply, 350kHz bandwidth, ±0.5% gain error, 1.2mA IQ | Higher precision but higher power; no AEC-Q100 qualification - limited to non-automotive industrial use | Select only for non-automotive designs requiring tighter gain tolerance; not suitable for automotive PPAP. |
Compared with INA240A3QDRQ1 and MAX40056ATA+T, the ZXCT181QA3W6-7 delivers optimal balance of AEC-Q100 compliance, ultra-low IQ (300μA), and integrated bidirectional configuration - making it the preferred choice for cost-sensitive, always-on automotive current monitoring where 150kHz bandwidth suffices.
Availability
ZXCT181QA3W6-7 is available at Aetrix Electronics and suitable for vehicle motor controls, body electronics fault detection, and wireless charging systems requiring stable component supply across automotive production lifecycles.
Supply support for ZXCT181QA3W6-7 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.
The ZXCT181Q series targets automotive current sensing with AEC-Q100 qualification, wide common-mode range, and low-power operation - designed specifically for motor control, battery management, and fault protection in harsh-temperature environments.
FAQ
What is the maximum common-mode voltage the ZXCT181QA3W6-7 can measure?
The ZXCT181QA3W6-7 supports a common-mode input range of −0.3V to +26V on IN+ and IN− pins, independent of its 2.7V–5.5V supply voltage. This allows direct high-side sensing in 24V automotive systems without external level-shifting circuitry, and the input stage remains functional even when VS = 0V.
How do I configure the ZXCT181QA3W6-7 for bidirectional current sensing?
Connect a stable voltage source (0V to VS) to the REF pin - typically 2.5V for symmetric ±2.5V output swing. Positive differential input (IN+ > IN−) produces output above REF; negative differential input produces output below REF. Use a buffered voltage divider or precision reference to minimize REF-induced errors.
Does the ZXCT181QA3W6-7 require external compensation capacitors?
No external compensation is required. The device is internally compensated for stability with up to 1nF capacitive load. A 0.1μF ceramic bypass capacitor placed between VS and GND, as close as possible to pins 6 and 2, is mandatory for noise immunity and power-supply rejection - omission causes oscillation or degraded PSRR.
What is the minimum shunt resistance usable with ZXCT181QA3W6-7 at 12V bus?
With 100V/V gain and 3.3V ADC full-scale, the minimum measurable shunt voltage is ~10mV (3.3V / 100V/V / 3.3-bit LSB). At 12V common-mode, ±400μV offset contributes ≤4% error at 10mV - so a 10mΩ shunt yields 100mA full-scale with <5% total error. Lower shunts increase noise sensitivity and require careful PCB layout.
ZXCT181QA3W6-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- ZXCT181Q
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Monitor
- Sensing Method:
- High/Low-Side
- Accuracy:
- ±0.1%
- Voltage - Input:
- 2.7V ~ 5.5V
- Current - Output:
- 8mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-26
ZXCT181QA3W6-7 FAQ
1.How can I place an order for ZXCT181QA3W6-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXCT181QA3W6-7 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 ZXCT181QA3W6-7 reliable?
The price and inventory of ZXCT181QA3W6-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXCT181QA3W6-7 is usually 5 days.
3.What payment methods are accepted for ZXCT181QA3W6-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXCT181QA3W6-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXCT181QA3W6-7?
ZXCT181QA3W6-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXCT181QA3W6-7 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 ZXCT181QA3W6-7?
For technical support, including ZXCT181QA3W6-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXCT181QA3W6-7 requirements.
6.How does Aetrix verify that ZXCT181QA3W6-7 is sourced from the original manufacturer or authorized distributors?
All ZXCT181QA3W6-7 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 ZXCT181QA3W6-7 meets industry standards.
7.What is the process for return or replacement of ZXCT181QA3W6-7?
All ZXCT181QA3W6-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXCT181QA3W6-7, 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 ZXCT181QA3W6-7 part is unused and in its original packaging.
Return procedure for ZXCT181QA3W6-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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