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Texas Instruments INA181A4QDCKRQ1
- Part No.:
- INA181A4QDCKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
INA181A4QDCKRQ1.pdf
- Description:
- AEC-Q100, 26V, BI-DIRECTIONAL, 3
- Quantity:
- Payment:
- Shipping:
Inventory:2,965
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Product details
Overview
INA181A4QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier designed for bidirectional, high-accuracy shunt-based current monitoring in both low-side and high-side configurations. It features 200V/V fixed gain, –0.2V to 26V input common-mode range, ±500µV max offset at 12V VCM, 105kHz bandwidth, and 2V/µs slew rate-enabling precise motor phase current sensing in 12V/24V automotive power stages.
For engineers reviewing the INA181A4QDCKRQ1 datasheet, INA181A4QDCKRQ1 pinout, INA181A4QDCKRQ1 application, or INA181A4QDCKRQ1 equivalent, key selection criteria include its 200V/V gain scaling for low-mV sense resistor outputs, rail-to-rail output swing (within 30mV of VS and 5mV of GND), functional safety documentation support, and SC70-6 package compatibility with space-constrained ECU and battery management layouts.
Technical Context
The INA181A4QDCKRQ1 employs a precision current-shunt monitor architecture with integrated matched resistor gain network-eliminating external gain-setting components and minimizing temperature-induced gain drift (≤20ppm/°C). Its input stage operates independently of supply voltage, enabling accurate sensing at bus voltages up to 26V while powered from only 2.7V–5.5V.
This device supports bidirectional current detection via REF pin biasing, delivering output = GAIN × (IN+ − IN−) + VREF. With ±1% max gain error, 1µV/°C max offset drift, and 84–100dB CMRR over –40°C to +125°C, it meets stringent accuracy requirements for closed-loop motor control and battery cell balancing in ASIL-B systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V fixed-converts ±10mV sense voltage to ±2V output, enabling direct interface with 3.3V ADCs without additional amplification |
| Common-mode range | –0.2V to 26V-supports high-side sensing on 24V battery rails and low-side sensing near ground, independent of 2.7–5.5V supply |
| Offset voltage | ±500µV max at VCM = 12V-ensures ≤0.5% error at 1A through 500µΩ shunt, critical for <1% full-scale accuracy in BMS |
| Bandwidth | 105kHz at CL = 10pF-captures fast transients in BLDC motor commutation and short-circuit events within 3µs rise time |
| Slew rate | 2V/µs-maintains linearity during 100mA/µs current steps, preventing distortion in PWM-driven load monitoring |
| Quiescent current | 260µA max-enables always-on current monitoring in low-power vehicle modules without compromising battery standby life |
| Supply voltage | 2.7V to 5.5V-compatible with standard automotive LDO outputs and allows operation during cold-crank (down to 2.7V) |
Pinout & Package
INA181A4QDCKRQ1 is packaged in a 6-pin SC70 (DCK) footprint measuring 2.00mm × 2.10mm, optimized for high-density automotive PCB layouts with thermal performance characterized by RθJA = 188°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog reference input | Bias point for bidirectional output: sets zero-current output level; 0V to VS range enables center-scaled output for ± current measurement |
| 2 - GND | Analog ground | Return path for internal circuitry and reference; must be connected to low-impedance system ground plane to maintain CMRR & noise immunity |
| 3 - VS | Power supply | 2.7–5.5V analog supply; decoupling with 0.1µF ceramic capacitor required at pin to suppress supply noise coupling into output |
| 4 - IN+ | Positive current-sense input | Connect to high-potential side of shunt: bus voltage in high-side, load side in low-side configuration |
| 5 - IN− | Negative current-sense input | Connect to low-potential side of shunt: load side in high-side, ground side in low-side configuration |
| 6 - OUT | Analog output | Voltage output = 200 × (VIN+ − VIN−) + VREF; rail-to-rail swing (within 30mV of VS, 5mV of GND) maximizes dynamic range for ADC digitization |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation-meets reliability and stress-test requirements for engine bay and transmission control units |
| Functional safety documentation | FIT rate, failure mode analysis, and diagnostic coverage reports available-supports ISO 26262 ASIL-B hardware development workflows |
| Matched internal gain resistors | Eliminates external gain-setting components and reduces layout sensitivity-improves production yield and long-term stability vs discrete resistor networks |
| Rail-to-rail output | Output swings to within 30mV of VS and 5mV of GND-preserves >98% of 3.3V ADC full scale when VS = 3.3V, maximizing SNR |
| High CMRR (84–100dB) | Maintains accuracy despite 26V common-mode transients-rejects battery ripple and switching noise in 48V mild-hybrid systems |
| Bidirectional sensing capability | Enables regenerative braking current measurement and reverse-load detection using single-shunt topology-reduces BOM count vs dual-amplifier solutions |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current sensing in 3-phase BLDC traction inverters for electric power steering (EPS) and HVAC compressors. IC Role / Device Role / Timing Role: High-side current-shunt monitor providing isolated, low-latency feedback to MCU PWM timers for field-oriented control (FOC). Use Value: 105kHz bandwidth and 2V/µs slew rate capture rapid current transitions during commutation, enabling <5µs current loop update for stable torque regulation. |
Use Scenario: Cell-level current monitoring in 12S Li-ion battery packs for EV auxiliary systems and start-stop modules. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier interfacing with 16-bit SAR ADC to detect charge/discharge direction and magnitude per cell string. Use Value: ±500µV offset at 12V VCM ensures <0.25% full-scale error at 50A with 100µΩ shunt-meeting IEC 62619 accuracy requirements for battery protection ICs. |
| Power Management | Lighting Control |
Use Scenario: Load current supervision in automotive DC-DC converters supplying ADAS cameras and radar modules. IC Role / Device Role / Timing Role: Low-side current monitor feeding fault logic in PMIC supervisory circuit for overcurrent shutdown. Use Value: –0.2V to 26V common-mode range tolerates negative transients during load dump, preventing false trips during ISO 7637-2 pulse 5a events. |
Use Scenario: LED string current regulation in adaptive front lighting systems (AFS) with PWM dimming. IC Role / Device Role / Timing Role: High-bandwidth current feedback element in closed-loop LED driver for flicker-free brightness control across 100–10,000Hz PWM frequencies. Use Value: 200V/V gain scales 20mV shunt drop to 4V output-matching 3.3V ADC reference while maintaining 12-bit ENOB under PWM switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A4QDRQ1 | 200V/V gain, wider –4V to 80V common-mode range, higher 400kHz bandwidth, 3.5V/µs slew rate, 1.1mA IQ | Supports 48V mild-hybrid systems and higher-speed motor control; less suitable for ultra-low-power always-on monitoring | Select for 48V architectures or where >105kHz bandwidth is required; requires higher supply current budget |
| MAX40056ATA+T | 200V/V gain, –0.1V to 65V common-mode, 250kHz bandwidth, 1.5V/µs slew rate, 350µA IQ, integrated overvoltage protection | Includes internal clamp diodes for transient robustness; lacks AEC-Q100 Grade 1 qualification and functional safety documentation | Select when transient protection is prioritized over ASIL compliance; not qualified for safety-critical powertrain use |
Compared with INA181A4QDCKRQ1, INA240A4QDRQ1 offers extended voltage range and speed at higher quiescent current, while MAX40056ATA+T adds transient protection but omits automotive qualification-making INA181A4QDCKRQ1 optimal for cost-sensitive, ASIL-B-compliant 12V/24V applications requiring minimal IQ and proven qualification.
Availability
INA181A4QDCKRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitoring, and automotive power management applications requiring stable component supply, AEC-Q100 compliance, and functional safety documentation support.
Supply support for INA181A4QDCKRQ1 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade signal conditioning and power management ICs.
The INA181-Q1 family was designed specifically for cost-optimized, high-accuracy bidirectional current sensing in automotive ECUs, battery management systems, and power distribution modules-emphasizing AEC-Q100 reliability, functional safety readiness, and minimal external component count.
FAQ
What is the maximum common-mode voltage supported by the INA181A4QDCKRQ1?
The INA181A4QDCKRQ1 supports a common-mode input voltage range of –0.2V to 26V, independent of its 2.7V–5.5V supply voltage. This enables reliable high-side sensing on 24V battery rails and tolerance of negative transients during load dump events-critical for automotive powertrain and chassis applications where bus voltage exceeds supply rails.
Does the INA181A4QDCKRQ1 require external gain-setting resistors?
No. The INA181A4QDCKRQ1 integrates a precision matched resistor network for its 200V/V fixed gain, eliminating external gain components. This reduces PCB area, improves temperature stability (gain drift ≤20ppm/°C), and enhances production consistency-key advantages over discrete op-amp + resistor solutions in automotive volume manufacturing.
How does the INA181A4QDCKRQ1 enable bidirectional current sensing?
The INA181A4QDCKRQ1 achieves bidirectional sensing by accepting a user-defined reference voltage at its REF pin. Output voltage equals 200 × (IN+ − IN−) + VREF: positive differential input raises output above VREF, negative differential lowers it below VREF. Setting VREF = VS/2 creates symmetric ± output swing for equal-resolution charge/discharge measurement in battery systems.
Is the INA181A4QDCKRQ1 qualified for automotive safety applications?
Yes. The INA181A4QDCKRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and explicitly labeled "Functional Safety-Capable." Texas Instruments provides FIT data, FMEA reports, and safety manual documentation to support ISO 26262 ASIL-B hardware integration-making it suitable for safety-related motor control and battery protection functions.
What is the typical output swing capability of the INA181A4QDCKRQ1?
The INA181A4QDCKRQ1 delivers rail-to-rail output swing: within 30mV of the positive supply rail (VS) and within 5mV of ground. At VS = 3.3V, this provides >3.25V of usable output range-maximizing dynamic range when interfacing with 3.3V microcontroller ADCs and preserving signal integrity in noisy automotive environments.
INA181A4QDCKRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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:
- Single Ended, Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 105 kHz
- Current - Input Bias:
- 75 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 195µA
- Current - Output / Channel:
- 8 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
INA181A4QDCKRQ1 FAQ
1.How can I place an order for INA181A4QDCKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA181A4QDCKRQ1 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 INA181A4QDCKRQ1 reliable?
The price and inventory of INA181A4QDCKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA181A4QDCKRQ1 is usually 5 days.
3.What payment methods are accepted for INA181A4QDCKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA181A4QDCKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA181A4QDCKRQ1?
INA181A4QDCKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA181A4QDCKRQ1 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 INA181A4QDCKRQ1?
For technical support, including INA181A4QDCKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA181A4QDCKRQ1 requirements.
6.How does Aetrix verify that INA181A4QDCKRQ1 is sourced from the original manufacturer or authorized distributors?
All INA181A4QDCKRQ1 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 INA181A4QDCKRQ1 meets industry standards.
7.What is the process for return or replacement of INA181A4QDCKRQ1?
All INA181A4QDCKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA181A4QDCKRQ1, 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 INA181A4QDCKRQ1 part is unused and in its original packaging.
Return procedure for INA181A4QDCKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA181A4QDCKRQ1 Tags
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