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Diodes Incorporated ZXCT199QA3DW-7
- Part No.:
- ZXCT199QA3DW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
ZXCT199QA3DW-7.pdf
- Description:
- CM VOLTAGE OUTPUT SOT363 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
ZXCT199QA3DW-7 from Diodes Incorporated is an AEC-Q100 Grade 1 qualified, zero-drift bidirectional current shunt monitor IC with 200V/V fixed gain, ±0.8% max gain error over −40°C to +125°C, 80μV max input offset voltage, and −0.1V to 26V common-mode input range - designed for high-precision battery charging/discharging and EV on-board charger (OBC) current sensing using low-value shunts.
For engineers reviewing the ZXCT199QA3DW-7 datasheet, ZXCT199QA3DW-7 pinout, ZXCT199QA3DW-7 application, or ZXCT199QA3DW-7 equivalent, this device supports rail-to-rail output swing, 100μA max quiescent current, and bidirectional measurement via externally biased REF pin - critical for accurate ADC interfacing in automotive BMS and high-voltage DC/DC systems.
Technical Context
The ZXCT199QA3DW-7 implements a precision zero-drift chopper-stabilized amplifier architecture to achieve 0.5μV/°C max offset drift and 105dB min CMRR across −40°C to +125°C. Its differential input stage operates independently of supply voltage, enabling accurate sensing at common-mode voltages up to 26V while powered from as low as 2.7V.
It delivers 200V/V fixed gain with ±0.8% total gain error over temperature and features rail-to-rail output capable of sourcing/sinking ≥1mA into 10kΩ loads. The REF pin accepts 0V to V+ bias to configure unidirectional (grounded REF) or bidirectional (mid-scale REF) operation - essential for EV battery pack charge/discharge monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V - scales shunt voltage by factor of 200 for direct interface with 12–16-bit ADCs without external amplification |
| Input Offset Voltage | ±80μV max - enables accurate measurement of ≤10mV full-scale shunt drops, supporting <1mΩ sense resistors at >100A currents |
| Common-Mode Range | −0.1V to 26V - supports both high-side and low-side sensing in 12V/48V/800V automotive systems independent of 2.7–26V supply |
| Supply Current | 100μA max - minimizes self-heating and power loss in always-on BMS monitoring circuits |
| Output Swing | (V+) − 0.2V / GND + 0.05V - rail-to-rail capability ensures full dynamic range utilization with 3.3V or 5V ADC references |
| CMRR | 105dB min - rejects noise from high-dv/dt motor drives or DC/DC converters in ADAS and e-pump control modules |
| Operating Temp | −40°C to +125°C - meets automotive Grade 1 requirements for under-hood and traction battery applications |
Pinout & Package
Package: 6-pin SOT363 (2.2mm × 2.2mm × 1.1mm), lead-free, RoHS and AEC-Q100 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog reference input | Bias point for bidirectional operation; sets zero-current output level (e.g., 2.5V for ±5mV shunt range) |
| 2 - GND | Ground reference | Return path for internal circuitry and output stage; requires star grounding with ADC for <0.01% error |
| 3 - V+ | Power supply input | 2.7–26V operating range; powers internal amplifier and output buffer; bypass capacitor (0.01–0.1μF) required |
| 4 - IN+ | Differential input (+) | Connects to high-side of shunt; withstands up to 26V regardless of V+ level - enables high-side sensing above supply rail |
| 5 - IN− | Differential input (−) | Connects to low-side of shunt; forms differential pair with IN+; input bias current ≤28μA affects high-impedance designs |
| 6 - OUT | Analog output | Voltage proportional to load current: VOUT = (ILOAD × RSHUNT) × 200 + VREF; drives 10kΩ ADC inputs directly |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | 0.5μV/°C max offset drift ensures stable calibration over full automotive temperature range without recalibration |
| Bidirectional current sensing | Configurable via REF pin bias - enables single-chip monitoring of battery charge (IN+ > IN−) and discharge (IN+ < IN−) cycles |
| Rail-to-rail output | Supports full-scale ADC utilization with 3.3V or 5V supplies - eliminates need for level-shifting or gain adjustment stages |
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation in safety-critical vehicle systems including OBC, BMS, and ESP |
| Low quiescent current | 100μA max enables continuous current monitoring in always-on vehicle subsystems without compromising battery standby life |
Applications
| EV On-Board Charger (OBC) | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Real-time bidirectional current monitoring during AC/DC conversion and DC fast charging cycles in 400V/800V EV architectures. IC Role / Device Role / Timing Role: High-precision shunt amplifier converting mV-level sense resistor voltage to scalable analog output for isolation ADC sampling. Use Value: Enables ±0.5% current accuracy at 200A with 0.5mΩ shunt, supporting ISO 6469-1 functional safety compliance for charge/discharge control. |
Use Scenario: Cell-level and pack-level current tracking during charge balancing, thermal management, and state-of-charge (SoC) estimation. IC Role / Device Role / Timing Role: Bidirectional analog front-end for current acquisition synchronized with coulomb counting algorithms in microcontroller-based BMS. Use Value: 80μV offset enables detection of ≤50mA leakage currents in 96S battery packs, improving SoC accuracy to ±0.8% over lifetime. |
| Electric Power Steering (EPS) | Automotive ADAS Actuators |
|
Use Scenario: Motor phase current sensing in 12V/48V EPS modules to detect torque anomalies and prevent mechanical failure. IC Role / Device Role / Timing Role: High-CMRR current monitor interfaced to MCU ADC for real-time closed-loop motor control at 10kHz update rate. Use Value: 105dB CMRR suppresses PWM switching noise from gate drivers, reducing current measurement jitter to <0.1% FS in 100A peak loads. |
Use Scenario: Solenoid and valve coil current profiling in radar cooling pumps, brake-by-wire actuators, and camera focus mechanisms. IC Role / Device Role / Timing Role: Low-drift analog sensor for detecting coil open-circuit, short-circuit, and saturation faults during active ADAS operation. Use Value: 0.5μV/°C drift ensures consistent fault thresholds across −40°C cold soak to +125°C under-hood conditions - critical for ASIL-B diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3QDRQ1 | 200V/V gain, ±150μV offset, 120dB CMRR, SOIC-8 package | Higher CMRR improves noise immunity in high-frequency inverter environments but requires larger PCB area | Preferred for new designs requiring highest noise rejection in 800V traction inverters where board space permits SOIC-8 |
| MAX40056ATA+T | 200V/V gain, ±100μV offset, 110dB CMRR, 8-pin TDFN package | Smaller 3mm × 3mm footprint but lacks AEC-Q100 Grade 1 qualification and has narrower −5V to 65V CM range | Suitable for non-safety-critical industrial motor controls where automotive qualification is not mandated |
Compared with ZXCT199QA3DW-7, INA240A3QDRQ1 offers superior CMRR for noisy inverter applications but increases board area and cost, while MAX40056ATA+T reduces footprint yet sacrifices automotive qualification and low-voltage common-mode capability below −0.1V - making ZXCT199QA3DW-7 optimal for AEC-Q100-compliant, space-constrained EV power systems.
Availability
ZXCT199QA3DW-7 is available at Aetrix Electronics and suitable for EV on-board chargers, automotive battery management systems, and electric power steering modules requiring stable component supply with full AEC-Q100 traceability and PPAP support.
Supply support for ZXCT199QA3DW-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.
The ZXCT199Q series belongs to Diodes' automotive-qualified precision analog portfolio, engineered specifically for high-accuracy current sensing in safety-critical vehicle electrification systems including BMS, OBC, and ADAS actuators.
FAQ
What is the maximum common-mode voltage the ZXCT199QA3DW-7 can measure when powered from 5V?
The ZXCT199QA3DW-7 supports −0.1V to 26V common-mode input voltage regardless of supply voltage - so even with a 5V V+, it accurately measures shunt voltages at 12V, 24V, or 48V system rails. This enables high-side sensing above the supply rail without level-shifting circuitry.
How is bidirectional current sensing implemented with the REF pin?
Bidirectional operation requires biasing the REF pin to a defined voltage (e.g., 2.5V for 5V supply). When IN+ > IN−, OUT rises above REF; when IN+ < IN−, OUT falls below REF. This allows a single-ended ADC to distinguish charge (positive output deviation) from discharge (negative deviation) relative to the REF baseline.
Does the ZXCT199QA3DW-7 require external filtering on the IN+ and IN− pins?
External RC filtering is optional but recommended in high-dv/dt environments (e.g., motor drives). If used, source resistors must be ≤10Ω and well-matched to avoid degrading CMRR and gain accuracy; mismatch >0.1% introduces measurable offset and gain errors per datasheet Equation 1.
What is the minimum shunt voltage this device can resolve with guaranteed accuracy?
With ±80μV max offset and 200V/V gain, the ZXCT199QA3DW-7 resolves shunt voltages down to ±0.4mV (±80μV ÷ 200) with full accuracy - enabling use of 0.2mΩ shunts at 2A full-scale or 0.5mΩ shunts at 5A full-scale in automotive-grade designs.
ZXCT199QA3DW-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- Zero-Drift
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 14 kHz
- Current - Input Bias:
- 28 µA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- 65µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 26 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-363
ZXCT199QA3DW-7 FAQ
1.How can I place an order for ZXCT199QA3DW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXCT199QA3DW-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 ZXCT199QA3DW-7 reliable?
The price and inventory of ZXCT199QA3DW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXCT199QA3DW-7 is usually 5 days.
3.What payment methods are accepted for ZXCT199QA3DW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXCT199QA3DW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXCT199QA3DW-7?
ZXCT199QA3DW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXCT199QA3DW-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 ZXCT199QA3DW-7?
For technical support, including ZXCT199QA3DW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXCT199QA3DW-7 requirements.
6.How does Aetrix verify that ZXCT199QA3DW-7 is sourced from the original manufacturer or authorized distributors?
All ZXCT199QA3DW-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 ZXCT199QA3DW-7 meets industry standards.
7.What is the process for return or replacement of ZXCT199QA3DW-7?
All ZXCT199QA3DW-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXCT199QA3DW-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 ZXCT199QA3DW-7 part is unused and in its original packaging.
Return procedure for ZXCT199QA3DW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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