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Diodes Incorporated ZXCT181QA4W6-7
- Part No.:
- ZXCT181QA4W6-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Current Regulation/Management
- Package:
- SOT-23-6
- Datasheet:
-
ZXCT181QA4W6-7.pdf
- Description:
- CM VOLTAGE OUTPUT SOT26 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
ZXCT181QA4W6-7 from Diodes Incorporated is an AEC-Q100 qualified automotive current shunt monitor with 200V/V fixed gain, 400kHz small-signal bandwidth at 20V/V (85kHz at 200V/V), ±1% max gain error over temperature, and rail-to-rail output. It operates from 2.7V to 5.5V supply while sensing across shunts at common-mode voltages from –0.3V to 26V - enabling high-side and low-side motor control current monitoring in 12V/24V vehicle systems.
For engineers reviewing the ZXCT181QA4W6-7 datasheet, ZXCT181QA4W6-7 pinout, ZXCT181QA4W6-7 application, or ZXCT181QA4W6-7 equivalent, key selection criteria include its 200V/V gain accuracy, bi-directional current sensing capability via REF pin biasing, 2V/µs slew rate for fast fault detection, and SOT26 package suitability for space-constrained automotive PCB layouts.
Technical Context
The ZXCT181QA4W6-7 uses a precision current-sense amplifier topology that isolates input common-mode voltage (–0.3V to 26V) from supply rails (2.7V–5.5V), enabling accurate measurement of shunt voltage drops independent of VS. Its internal matched resistor network sets fixed 200V/V gain with ±1% error over –40°C to +125°C.
Bi-directional operation is enabled by externally applying a reference voltage (0V to VS) to the REF pin, shifting output baseline to support both charging and discharging current detection. Unidirectional mode is achieved by grounding REF, though ≥50mV bias is recommended for low-current linearity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V fixed - scales shunt voltage drop to full-scale output range for direct ADC interfacing without external amplification |
| Small-Signal Bandwidth | 85kHz at 200V/V - supports real-time current monitoring in e-pump and valve driver switching cycles up to ~10kHz |
| Common-Mode Range | –0.3V to 26V - enables high-side sensing on 24V battery rails and low-side sensing with negative ground transients |
| Offset Voltage (max) | ±400µV - ensures ≤0.2% full-scale error at 2mV shunt drop, critical for <1A current resolution |
| Supply Current (max) | 300µA - allows integration into always-on vehicle modules without excessive quiescent power draw |
| Operating Temp | –40°C to +125°C - meets under-hood automotive ambient requirements per AEC-Q100 Grade 0 |
| Slew Rate | 2V/µs - delivers sub-microsecond response to overcurrent events for timely fault shutdown in motor drivers |
Pinout & Package
Package: 6-pin SOT26 (3.0mm × 2.8mm × 1.1mm), moisture sensitivity level 1, matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Analog output | Rail-to-rail voltage output referenced to VS/GND; drives ADC inputs or comparator thresholds directly |
| GND (Pin 2) | Ground reference | Power and signal return path; must be star-connected with ADC ground to minimize offset error |
| IN+ (Pin 3) | High-side shunt connection | Connects to supply side of shunt resistor; withstands up to 26V regardless of VS presence |
| IN– (Pin 4) | Low-side shunt connection | Connects to load side of shunt; differential input rejects common-mode noise on battery lines |
| REF (Pin 5) | Output offset control | Bias point for bi-directional sensing (e.g., 2.5V for ±100% current range); error here directly adds to output |
| VS (Pin 6) | Power supply | 2.7V–5.5V analog supply; powers internal circuitry and defines output swing limits |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 0 (–40°C to +125°C), PPAP-capable, manufactured in IATF16949-certified facilities - meets OEM automotive qualification requirements |
| Rail-to-rail output | Swings within 20mV of VS and 0.5mV of GND - maximizes dynamic range for 12-bit ADCs powered from same 5V rail |
| Low quiescent current | Max 300µA - enables use in always-on body control modules without compromising battery drain budgets |
| High CMRR | Min 84dB (typ 110dB) - rejects noise from 24V battery ripple and switching regulator coupling in shared ground planes |
| ESD robustness | 5kV HBM - survives handling and assembly in automotive manufacturing environments without additional protection circuitry |
Applications
| Vehicle Motor Control | Automotive Fault Detection |
|---|---|
|
Use Scenario: Monitoring phase current in 12V/24V brushed DC motors driving HVAC blowers or seat adjusters. IC Role / Device Role / Timing Role: High-side current sense amplifier providing real-time feedback to MCU PWM controller for torque regulation and stall detection. Use Value: 200V/V gain resolves 5mA current steps across 10mΩ shunt; 85kHz bandwidth captures transient overloads before thermal damage occurs. |
Use Scenario: Detecting short-circuit or wiring fault currents in body control module (BCM) power distribution networks. IC Role / Device Role / Timing Role: Low-side current monitor feeding fast comparator or ADC interrupt to trigger immediate load disconnect. Use Value: 2V/µs slew rate enables sub-1µs response to >5× overcurrent events, supporting ASIL-B fault reaction timing requirements. |
| Wireless Charging System | EV Battery Management |
|
Use Scenario: Measuring bidirectional coil current during resonant wireless power transfer in vehicle infotainment docking systems. IC Role / Device Role / Timing Role: Bi-directional current sensor with REF-biased output to distinguish transmit vs. receive direction and detect foreign object insertion. Use Value: ±26V common-mode range accommodates floating secondary-side measurements; 200V/V gain provides 10-bit resolution on 3.3V ADC for ±5A sensing range. |
Use Scenario: Cell-level or pack-level current monitoring in 48V mild-hybrid battery systems during charge/discharge cycling. IC Role / Device Role / Timing Role: High-accuracy shunt monitor interfaced to BMS microcontroller for state-of-charge calculation and thermal runaway prevention. Use Value: ±400µV max offset ensures <0.5% current measurement error over lifetime, critical for SOC estimation accuracy and warranty compliance. |
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, 400kHz bandwidth, ±10µV offset, dual supply option | Requires external gain stage for 200× scaling; better for ultra-low-offset precision but larger footprint | Select when <100µV offset is mandatory and board space permits SOIC-8 packaging |
| MAX40056ATA+T | 200V/V gain, 250kHz bandwidth, ±150µV offset, integrated reference | Includes internal 2.5V REF - eliminates external bias circuit but lacks REF flexibility for asymmetric ranges | Select when simplified layout is prioritized and mid-scale REF suffices for bi-directional use cases |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the ZXCT181QA4W6-7 offers the smallest footprint (SOT26), lowest quiescent current (300µA), and widest common-mode range (–0.3V to 26V), making it optimal for space- and power-constrained automotive modules requiring high-gain, high-voltage sensing.
Availability
ZXCT181QA4W6-7 is available at Aetrix Electronics and suitable for vehicle motor controls, fault current detection systems, wireless charging interfaces, and EV battery management requiring stable component supply across automotive production lifecycles.
Supply support for ZXCT181QA4W6-7 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 company specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, computing, and consumer markets.
The ZXCT181Q series targets automotive current sensing with AEC-Q100 qualification, wide common-mode operation, and low-power design - specifically engineered for motor control, battery management, and fault protection in harsh-temperature vehicle subsystems.
FAQ
What is the maximum common-mode voltage the ZXCT181QA4W6-7 can measure?
The ZXCT181QA4W6-7 supports a common-mode input voltage range of –0.3V to +26V, independent of its 2.7V–5.5V supply voltage. This allows direct high-side sensing on 24V battery rails without level-shifting circuitry, and tolerates negative transients during load dump events.
How does the REF pin enable bi-directional current sensing?
Applying a voltage (e.g., 2.5V) to the REF pin establishes the zero-current output baseline. Positive differential input (IN+ > IN–) drives OUT above REF; negative differential input drives OUT below REF. This enables full-range measurement of charging and discharging currents using a single shunt resistor.
What is the small-signal bandwidth at 200V/V gain?
At 200V/V gain, the ZXCT181QA4W6-7 has a small-signal bandwidth of 85kHz (CL = 10pF). This is specified in the Electrical Characteristics table and confirmed in Figure 6 of the datasheet, where gain rolls off at higher frequencies due to internal compensation.
Is external bypass capacitance required for stable operation?
Yes - a 0.1µF ceramic capacitor must be placed between VS and GND, as close as possible to pins 6 and 2. This decouples high-frequency noise and prevents oscillation, especially under varying load conditions. Additional bulk capacitance may be added for noisy power supplies.
ZXCT181QA4W6-7 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
ZXCT181QA4W6-7 FAQ
1.How can I place an order for ZXCT181QA4W6-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXCT181QA4W6-7 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 ZXCT181QA4W6-7 reliable?
The price and inventory of ZXCT181QA4W6-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXCT181QA4W6-7 is usually 5 days.
3.What payment methods are accepted for ZXCT181QA4W6-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXCT181QA4W6-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXCT181QA4W6-7?
ZXCT181QA4W6-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXCT181QA4W6-7 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 ZXCT181QA4W6-7?
For technical support, including ZXCT181QA4W6-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXCT181QA4W6-7 requirements.
6.How does Aetrix verify that ZXCT181QA4W6-7 is sourced from the original manufacturer or authorized distributors?
All ZXCT181QA4W6-7 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 ZXCT181QA4W6-7 meets industry standards.
7.What is the process for return or replacement of ZXCT181QA4W6-7?
All ZXCT181QA4W6-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXCT181QA4W6-7, 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 ZXCT181QA4W6-7 part is unused and in its original packaging.
Return procedure for ZXCT181QA4W6-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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