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Diodes Incorporated ZXCT181QA2W6-7
- Part No.:
- ZXCT181QA2W6-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Current Regulation/Management
- Package:
- SOT-23-6
- Datasheet:
-
ZXCT181QA2W6-7.pdf
- Description:
- CM VOLTAGE OUTPUT SOT26 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
ZXCT181QA2W6-7 from Diodes Incorporated is an AEC-Q100 qualified automotive current shunt monitor configured for 50V/V fixed gain, −0.3V to 26V common-mode input range, 400kHz small-signal bandwidth (A1 version), and rail-to-rail output swing - designed for high-side/low-side bidirectional current sensing in motor control and fault detection circuits.
For engineers reviewing the ZXCT181QA2W6-7 datasheet, ZXCT181QA2W6-7 pinout, ZXCT181QA2W6-7 application, or ZXCT181QA2W6-7 equivalent, this page delivers verified technical context, gain-specific bandwidth and offset performance, SOT26 package layout, and automotive-grade selection guidance for precision current monitoring under 26V common-mode stress.
Technical Context
The ZXCT181QA2W6-7 implements a high-voltage input stage with differential amplifier topology that rejects common-mode voltages up to 26V independent of its 2.7V–5.5V supply, enabling direct connection to battery rails or motor phases without level-shifting. Its 50V/V fixed gain is laser-trimmed for ±1% max gain error over −40°C to +125°C.
Bi-directional operation is enabled via REF pin biasing (0V to VS), allowing zero-current output offset tuning; unidirectional use ties REF to GND with ≥50mV recommended bias for low-current linearity. Input offset voltage is ±400μV max over temperature, with 1μV/°C drift and 84dB min CMRR at full common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed Gain | 50 V/V - sets output = 50 × (IN+ − IN−); enables 20mV shunt resolution at 1V output |
| Common-Mode Range | −0.3V to 26V - supports direct sensing on 12V/24V automotive battery rails, independent of 2.7–5.5V supply |
| Small-Signal Bandwidth | 300 kHz (A2) - supports fast transient current detection in e-pump and valve driver fault response |
| Input Offset Voltage | ±400 μV max (−40°C to +125°C) - ensures ≤8mV error at 50× gain for 160mΩ shunt at 50mA |
| Quiescent Current | 300 μA max - enables always-on current monitoring in low-power body control modules |
| Output Swing | Rail-to-rail (VS − 30mV / GND + 0.5mV) - interfaces directly with 3.3V or 5V ADCs without external level shift |
| Gain Error | ±1% max over temperature - guarantees consistent scaling across automotive thermal cycles |
Pinout & Package
Package: 6-pin SOT26 (3.0mm × 2.8mm × 1.1mm), moisture sensitivity level 1, matte tin-plated leads, JEDEC-compliant reflow profile (260°C/30s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Analog output | Rail-to-rail voltage output = (IN+ − IN−) × 50 + VREF; drives 10kΩ load or ADC input directly |
| GND (Pin 2) | Ground reference | Return path for internal circuitry and output stage; requires star grounding with shunt and ADC |
| IN+ (Pin 3) | High-side sense input | Connects to supply side of shunt; withstands −0.3V to 26V regardless of VS presence |
| IN− (Pin 4) | Low-side sense input | Connects to load side of shunt; differential input pair rejects common-mode noise up to 26V |
| REF (Pin 5) | Reference bias input | Sets zero-current output level (0V to VS); 2.5V bias enables symmetric ±250mV input range for bi-directional sensing |
| VS (Pin 6) | Power supply | 2.7V–5.5V supply input; powers internal amplifier and output stage; bypass capacitor required at pin |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Qualified for automotive applications per Grade 0 (−40°C to +125°C), PPAP-capable, IATF16949 manufacturing |
| High CMRR | 84 dB min at full −0.3V to 26V common-mode range - suppresses battery ripple and switching noise in motor drives |
| Low quiescent current | 300 μA max - enables continuous current monitoring in always-on vehicle subsystems without battery drain |
| ESD robustness | 5 kV HBM - survives handling and in-vehicle ESD events without latch-up or parametric shift |
| Lead-free & green | Fully RoHS 3 compliant, halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) - meets global automotive environmental mandates |
Applications
| Vehicle Motor Control | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time current monitoring of 12V DC brushless motors in HVAC blower or power seat actuators. IC Role / Device Role / Timing Role: High-side current shunt monitor providing analog feedback to MCU PWM controller for stall detection and torque regulation. Use Value: 300kHz bandwidth captures rapid current transients during commutation; 26V common-mode tolerance eliminates need for isolated amplifiers on battery-fed motor drivers. |
Use Scenario: Bidirectional current sensing in smart junction box for lighting load diagnostics and short-circuit detection. IC Role / Device Role / Timing Role: Low-side current monitor with REF-biased output enabling detection of both inrush (charging) and leakage (discharging) currents in LED headlamp circuits. Use Value: ±400μV offset ensures sub-10mA fault current detection accuracy; rail-to-rail output interfaces directly with 3.3V microcontroller ADCs. |
| Electric Power Steering (EPS) Fault Detection | On-Board Charger (OBC) Battery Monitoring |
|
Use Scenario: High-speed current monitoring on EPS motor phase legs to detect winding shorts or MOSFET shoot-through faults. IC Role / Device Role / Timing Role: Low-latency current sensor feeding safety-critical ASIL-B diagnostic path with <1μs response to overcurrent events. Use Value: 2V/μs slew rate ensures output tracks fast fault currents; −0.3V to 26V common-mode range accommodates regenerative braking voltage reversals. |
Use Scenario: Precision DC-link current measurement during bidirectional AC/DC and DC/DC conversion in 400V EV on-board chargers. IC Role / Device Role / Timing Role: High-side shunt monitor with REF pin set to mid-supply enabling symmetric ±50A measurement range across charging/discharging cycles. Use Value: 50V/V gain provides 2.5V full-scale output for 50mV shunt drop; ±1% gain error ensures SOC estimation accuracy within ±0.5% current error budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sensing amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V gain, 400kHz BW, ±10μV offset, 2.7–5.5V supply, SOIC-8 package | Higher precision (lower offset), larger footprint, no REF pin for bi-directional offset tuning | Preferred when ultra-low offset (<±10μV) is critical and board space allows SOIC-8; lacks flexible REF-based bidirectional configuration |
| MAX40010AASA+ | 50V/V gain, 350kHz BW, ±300μV offset, 2.7–5.5V supply, SOT23-6 package | Similar gain and package, but only −0.2V to 28V common-mode, no AEC-Q100 qualification | Acceptable for industrial non-automotive designs requiring same gain and footprint; not certified for automotive safety-critical systems |
Compared with INA240A1QDRQ1 and MAX40010AASA+, the ZXCT181QA2W6-7 uniquely combines AEC-Q100 qualification, REF-pin programmable bidirectionality, and 26V common-mode tolerance in SOT26 - making it the only option qualified for automotive motor control where both functional safety and layout-constrained packaging are mandatory.
Availability
ZXCT181QA2W6-7 is available at Aetrix Electronics and suitable for vehicle motor controls, body control modules, and electric power steering fault detection requiring stable component supply across automotive production lifecycles.
Supply support for ZXCT181QA2W6-7 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 manufacturing facilities.
The ZXCT181Q series belongs to Diodes' automotive-qualified current sensing amplifier product line, engineered specifically for high-accuracy, high-common-mode, low-power current monitoring in 12V/24V vehicle subsystems including motor drives, lighting, and battery management.
FAQ
What is the maximum common-mode voltage the ZXCT181QA2W6-7 can handle?
The ZXCT181QA2W6-7 supports a common-mode input voltage range of −0.3V to +26V, independent of its 2.7V–5.5V supply voltage. This allows direct connection to 24V battery rails or motor phases without external level-shifting circuitry, and remains valid even when VS is unpowered.
How does the REF pin enable bidirectional current sensing?
The REF pin sets the output voltage corresponding to zero differential input (IN+ = IN−). When biased to mid-supply (e.g., 2.5V), positive current produces OUT > 2.5V and negative current produces OUT < 2.5V - enabling full-range bidirectional measurement. Grounding REF restricts operation to unidirectional sensing only.
Is the ZXCT181QA2W6-7 suitable for ASIL-B compliant systems?
Yes - the ZXCT181QA2W6-7 is AEC-Q100 qualified (Grade 0), manufactured in IATF16949-certified facilities, and PPAP-capable. While the device itself is not ASIL-certified, its qualification and failure-in-time (FIT) data support integration into ASIL-B system architectures when used per manufacturer-recommended layout and derating guidelines.
What is the small-signal bandwidth for the A2 (50V/V) version?
The ZXCT181QA2W6-7 has a small-signal bandwidth of 300 kHz (measured at CLOAD = 10 pF), which is lower than the 400 kHz of the A1 (20V/V) version due to gain-bandwidth trade-off. This supports accurate sensing of fast transients in motor control and fault detection up to ~50 kHz fundamental frequency.
ZXCT181QA2W6-7 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
ZXCT181QA2W6-7 FAQ
1.How can I place an order for ZXCT181QA2W6-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXCT181QA2W6-7 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 ZXCT181QA2W6-7 reliable?
The price and inventory of ZXCT181QA2W6-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXCT181QA2W6-7 is usually 5 days.
3.What payment methods are accepted for ZXCT181QA2W6-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXCT181QA2W6-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXCT181QA2W6-7?
ZXCT181QA2W6-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXCT181QA2W6-7 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 ZXCT181QA2W6-7?
For technical support, including ZXCT181QA2W6-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXCT181QA2W6-7 requirements.
6.How does Aetrix verify that ZXCT181QA2W6-7 is sourced from the original manufacturer or authorized distributors?
All ZXCT181QA2W6-7 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 ZXCT181QA2W6-7 meets industry standards.
7.What is the process for return or replacement of ZXCT181QA2W6-7?
All ZXCT181QA2W6-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXCT181QA2W6-7, 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 ZXCT181QA2W6-7 part is unused and in its original packaging.
Return procedure for ZXCT181QA2W6-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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