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Diodes Incorporated ZXCT180QB3W5-7
- Part No.:
- ZXCT180QB3W5-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ZXCT180QB3W5-7.pdf
- Description:
- CM VOLTAGE OUTPUT SOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
ZXCT180QB3W5-7 from Diodes Incorporated is an AEC-Q100 Grade 1 automotive current shunt monitor supporting uni-directional high-side and low-side sensing with a -0.3V to 26V common-mode input range, 100V/V fixed gain, ±1% max gain error over temperature, and 400kHz small-signal bandwidth at 20V/V (150kHz at 100V/V). It operates from 2.7V to 5.5V supply and delivers rail-to-rail output for motor control fault detection in 12V/24V vehicle systems.
For engineers reviewing the ZXCT180QB3W5-7 datasheet, ZXCT180QB3W5-7 pinout, ZXCT180QB3W5-7 application, or ZXCT180QB3W5-7 equivalent, key selection criteria include common-mode voltage tolerance beyond supply rails, gain accuracy across -40°C to +125°C, quiescent current ≤370μA, and SOT25 package compatibility with automotive PCB layout constraints.
Technical Context
The ZXCT180QB3W5-7 implements a precision current-sense amplifier topology that isolates measurement circuitry from high common-mode voltages using internal matched resistor networks and differential input stage design. Its architecture enables accurate RTI offset voltage tracking (±400μV max, 1μV/°C drift) while maintaining CMRR ≥84dB across -0.3V–26V VCM.
Pinout B configuration places the analog output on Pin 4, enabling flexible PCB routing for high-side sensing layouts where OUT must be routed away from noisy power traces. Gain is factory-set to 100V/V via internal laser-trimmed resistors, eliminating external component dependencies and ensuring monotonicity over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 5.5V - Enables direct interface with 3.3V or 5V microcontroller ADC reference rails without level-shifting. |
| Common-Mode Range | -0.3V to 26V - Supports battery monitoring in 24V commercial vehicles and reverse-polarity protection down to -0.3V. |
| Fixed Gain | 100V/V - Delivers 100mV output per 1mA shunt current, optimizing resolution for 10–100mΩ shunts in 1–10A motor control loops. |
| Gain Error | ±1% max over -40°C to +125°C - Ensures <1% full-scale error in e-pump current feedback without calibration across automotive temperature extremes. |
| Small-Signal Bandwidth | 150kHz at 100V/V gain - Captures transient overcurrent events in <7μs, sufficient for BLDC phase current monitoring at 20kHz PWM. |
| Quiescent Current | 370μA max - Allows continuous operation in always-on body control modules without compromising battery drain budgets. |
| Input Offset Voltage | ±400μV max at 12V VCM - Limits zero-current error to ≤4μA through 10mΩ shunt, critical for low-power valve actuator standby sensing. |
Pinout & Package
Package: 5-pin SOT25 (3.0mm × 1.6mm × 1.1mm), RoHS-compliant matte tin-plated leads, MSL Level 1, 0.012g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 2) | Reference ground | Low-impedance return path for internal biasing; must connect to star ground point shared with shunt and ADC to avoid measurement error. |
| VS (Pin 5) | Power supply | Supplies internal amplifiers and reference; requires 0.1μF ceramic bypass capacitor placed within 2mm of pin to suppress switching noise coupling. |
| IN+ (Pin 1) | High-side sense input | Connects to supply side of shunt; withstands up to 26V regardless of VS state - enables hot-swap and load-dump resilience. |
| IN– (Pin 3) | Low-side sense input | Connects to load side of shunt; differential input pair rejects common-mode transients during motor commutation spikes. |
| OUT (Pin 4) | Analog output | Voltage proportional to ILOAD × 100 - rail-to-rail swing (GND+0.0005V to VS–0.02V) interfaces directly with 12-bit SAR ADCs. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C ambient operation in engine bay and chassis-mounted modules with PPAP documentation support. |
| Four factory-set gain options | Eliminates external gain-setting resistors - reduces BOM count and layout sensitivity while guaranteeing monotonic gain vs. temperature. |
| Rail-to-rail output stage | Enables full utilization of 3.3V or 5V ADC input range without external op-amp buffering, minimizing signal chain error sources. |
| 2.7V minimum supply voltage | Supports operation during cold-crank conditions where battery drops to 2.8V, maintaining fault detection capability in starter circuits. |
| ESD robustness | 5kV HBM rating protects against assembly handling damage and in-vehicle ESD events near door modules and seat controls. |
Applications
| Vehicle Motor Control | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Monitoring phase current in 12V brushless DC fans for HVAC blower systems. IC Role / Device Role / Timing Role: High-side current sensor providing real-time feedback to MCU PWM controller for closed-loop speed regulation. Use Value: 150kHz bandwidth captures PWM ripple harmonics; ±1% gain error ensures torque consistency across temperature without recalibration. |
Use Scenario: Detecting overload in power window lift motors to trigger anti-pinch safety logic. IC Role / Device Role / Timing Role: Low-side current monitor feeding fast-response comparator circuit for <10ms fault detection. Use Value: 2V/μs slew rate enables detection of 5A surge in <1μs; rail-to-rail output drives comparator threshold directly. |
| Electric Power Steering (EPS) | Wireless Charging Pad |
|
Use Scenario: Sensing assist motor current in 24V EPS systems during parking maneuvers. IC Role / Device Role / Timing Role: High-side shunt monitor interfacing with 16-bit ADC for torque estimation algorithm. Use Value: 26V common-mode range accommodates load dump transients up to 35V; ±400μV offset limits zero-torque error to <4mA. |
Use Scenario: Measuring transmitter coil current in 15W Qi-compliant automotive charging pads. IC Role / Device Role / Timing Role: Uni-directional current sensor providing thermal derating feedback to power controller. Use Value: 370μA quiescent current minimizes standby loss; 100V/V gain optimizes dynamic range for 0.5–8A coil current range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V gain only; 4V/V to 500V/V programmable via external resistor; higher 100kHz bandwidth at 100V/V. | Requires external gain resistor and layout compensation; better for multi-gain designs but adds BOM and calibration complexity. | Select when programmable gain and lower offset (±5μV) justify added design effort and cost premium. |
| MAX40056ATA+T | 100V/V fixed gain; 200kHz bandwidth; ±0.5% gain error; 2.7V to 5.5V supply; same SOT23-5 package. | Higher gain accuracy but narrower -0.2V to 24V common-mode range - insufficient for 26V load-dump immunity. | Select for non-automotive industrial applications requiring tighter gain tolerance where 24V max VCM is acceptable. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the ZXCT180QB3W5-7 uniquely balances AEC-Q100 compliance, 26V common-mode tolerance, and fixed 100V/V gain in a cost-optimized SOT25 package - making it optimal for production automotive motor control where layout simplicity and transient resilience are prioritized over ultra-low offset.
Availability
ZXCT180QB3W5-7 is available at Aetrix Electronics and suitable for vehicle motor controls, body control modules, and electric power steering systems requiring stable component supply under IATF16949-certified manufacturing and PPAP documentation support.
Supply support for ZXCT180QB3W5-7 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 integrated circuits, specializing in high-reliability components for automotive, industrial, and computing markets.
The ZXCT180Q product line delivers AEC-Q100-qualified current-sense amplifiers optimized for cost-sensitive, high-transient automotive subsystems including valve actuators, lighting drivers, and e-pump controllers.
FAQ
What is the difference between ZXCT180QA3W5-7 and ZXCT180QB3W5-7?
ZXCT180QB3W5-7 uses Pinout B, placing the analog output (OUT) on Pin 4, whereas ZXCT180QA3W5-7 uses Pinout A with OUT on Pin 1. Both share identical electrical specifications - 100V/V gain, ±1% gain error, and 150kHz bandwidth - but differ solely in pin assignment to accommodate PCB layout constraints in high-density automotive modules.
Can ZXCT180QB3W5-7 measure bidirectional current?
No. The ZXCT180QB3W5-7 is a uni-directional current monitor designed only for positive current flow from IN+ to IN–. It lacks a reference input or offset adjustment to support bidirectional sensing; for reverse-current detection, a separate device such as the ZXCT181Q or dual-supply amplifier is required.
What is the maximum shunt resistor value supported at 10A full-scale with ZXCT180QB3W5-7?
With 100V/V gain and 5V supply, the maximum output voltage is 4.98V (VS – 0.02V). For 10A full-scale, maximum shunt voltage is 49.8mV, allowing a 4.98mΩ shunt. At 2.7V supply, output swing reduces to 2.68V, limiting shunt to 2.68mΩ for 10A - confirming optimal use with 1–5mΩ shunts in high-current automotive applications.
Does ZXCT180QB3W5-7 require external filtering for PWM motor current measurement?
No external RC filter is required for basic PWM current sampling due to its 150kHz bandwidth at 100V/V gain, which passes fundamental and first harmonic of 20kHz PWM. However, a 100pF capacitor at the OUT pin is recommended to suppress RF emissions from long PCB traces driving high-impedance ADC inputs.
ZXCT180QB3W5-7 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/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-25
ZXCT180QB3W5-7 FAQ
1.How can I place an order for ZXCT180QB3W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXCT180QB3W5-7 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 ZXCT180QB3W5-7 reliable?
The price and inventory of ZXCT180QB3W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXCT180QB3W5-7 is usually 5 days.
3.What payment methods are accepted for ZXCT180QB3W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXCT180QB3W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXCT180QB3W5-7?
ZXCT180QB3W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXCT180QB3W5-7 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 ZXCT180QB3W5-7?
For technical support, including ZXCT180QB3W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXCT180QB3W5-7 requirements.
6.How does Aetrix verify that ZXCT180QB3W5-7 is sourced from the original manufacturer or authorized distributors?
All ZXCT180QB3W5-7 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 ZXCT180QB3W5-7 meets industry standards.
7.What is the process for return or replacement of ZXCT180QB3W5-7?
All ZXCT180QB3W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXCT180QB3W5-7, 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 ZXCT180QB3W5-7 part is unused and in its original packaging.
Return procedure for ZXCT180QB3W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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