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Texas Instruments INA185A1QDCKRQ1
- Part No.:
- INA185A1QDCKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
INA185A1QDCKRQ1.pdf
- Description:
- AEC-Q100, 26-V, 350-KHZ, BI-DIRE
- Quantity:
- Payment:
- Shipping:
Inventory:2,259
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Product details
Overview
INA185A1QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 bidirectional current-sense amplifier optimized for automotive power monitoring. It delivers 20V/V fixed gain, ±55µV max offset at 0V common-mode, 350kHz bandwidth, and operates from 2.7V–5.5V supply across –40°C to 125°C - enabling precise shunt-based current measurement in high-side or low-side configurations of zonal controllers and ADAS domain modules.
For engineers reviewing the INA185A1QDCKRQ1 datasheet, INA185A1QDCKRQ1 pinout, INA185A1QDCKRQ1 application, or INA185A1QDCKRQ1 equivalent, key selection criteria include its 26V common-mode input range, 2V/µs slew rate, rail-to-rail output swing (≤3.5mV to GND), ±0.2% max gain error, and SC70-6 package compatibility with space-constrained automotive PCB layouts.
Technical Context
The INA185A1QDCKRQ1 employs a precision matched-resistor gain network for 20V/V fixed gain, eliminating external gain-setting components and minimizing temperature-induced gain drift (≤8 ppm/°C). Its proprietary topology supports common-mode voltages from –0.2V to 26V independent of 2.7V–5.5V supply voltage, enabling direct integration into 12V/24V automotive bus monitoring without level-shifting.
Bidirectional operation is enabled via REF pin biasing, allowing zero-current output offset tuning; combined with 2V/µs slew rate and 350kHz small-signal bandwidth, it supports real-time motor phase current tracking and fast fault detection in safety-critical ADAS sensor diagnostics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V fixed - eliminates external resistor matching errors and reduces layout sensitivity in production systems. |
| Common-mode range | –0.2V to 26V - enables direct high-side sensing on 24V battery rails without auxiliary supplies or attenuators. |
| Bandwidth | 350kHz - supports accurate capture of PWM motor currents up to ~35kHz fundamental with >10× oversampling. |
| Offset voltage | ±55µV max at VCM = 0V - ensures ≤0.275mV error at 25mΩ shunt, critical for low-current diagnostic thresholds. |
| Quiescent current | 260µA max - allows always-on current monitoring in body control modules without compromising sleep-mode power budgets. |
| Slew rate | 2V/µs - enables <5µs response to step-load transients, meeting ISO 16750-2 pulse test timing requirements. |
| Output swing | ≤3.5mV above GND - preserves ADC dynamic range when interfacing with 12-bit automotive microcontrollers. |
Pinout & Package
INA185A1QDCKRQ1 is housed in a 2.00mm × 2.10mm SC70-6 (DCK) package, optimized for thermal performance (RθJA = 188°C/W) and high-density automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Analog reference input | Biases output zero-current level; sets bidirectional mid-point (e.g., 2.5V for 5V supply) or ground-referenced unidirectional mode. |
| GND | Analog ground | Primary return path for internal circuitry; must be connected to low-impedance system ground plane to minimize offset drift. |
| VS | Power supply | 2.7V–5.5V single supply; requires ≥0.1µF ceramic bypass capacitor placed within 2mm of pin for stability. |
| OUT | Analog output | Amplified, rail-to-rail output (0.0035V–VS–0.026V); drives ADC inputs directly with minimal external filtering. |
| IN– | Negative current-sense input | Connects to load side (high-side) or ground side (low-side) of shunt; 75µA input bias current limits max RSENSE to ~1Ω for <0.1% error. |
| IN+ | Positive current-sense input | Connects to bus-voltage side (high-side) or load side (low-side) of shunt; matched with IN– for CMRR >86dB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to 125°C ambient operation with HBM ±3kV / CDM ±1kV ESD robustness - meets automotive electronics reliability standards. |
| Integrated 20V/V gain network | Matched thin-film resistors reduce gain error to ±0.2% and drift to ≤8 ppm/°C - eliminates calibration overhead in volume production. |
| Rail-to-rail output stage | Output swings to within 3.5mV of GND and 26mV of VS - maximizes usable ADC code count without external level-shifting. |
| Bidirectional sensing capability | REF pin programmability enables symmetric ±ILOAD measurement - essential for battery charge/discharge monitoring in ADAS domain controllers. |
| High CMRR at full range | 86dB minimum over –0.2V to 26V VCM - rejects noise from switching regulators and CAN transceivers in shared chassis-ground systems. |
Applications
| Zonal Control Module Current Monitoring | ADAS Domain Controller Power Integrity |
|---|---|
Use Scenario: Real-time monitoring of individual zone loads (e.g., lighting, HVAC actuators) in centralized vehicle architecture. IC Role / Device Role / Timing Role: Bidirectional current-sense amplifier measuring shunt voltage across 10mΩ–50mΩ resistors at 12V bus, with REF biased to 2.5V for ±10A range. Use Value: Enables predictive maintenance by detecting gradual current drift in solenoids; 350kHz bandwidth captures PWM dimming harmonics for flicker analysis. | Use Scenario: Continuous power-rail supervision of radar/Ethernet processing units during active ADAS maneuvers. IC Role / Device Role / Timing Role: High-side current monitor on 5V/3.3V LDO outputs, interfaced to MCU ADC with 1µs sampling interval. Use Value: Detects <50mA short-circuit faults within 20µs using slew-rate-limited comparator trigger - faster than system-level watchdog timeout. |
| Body Control Module Load Diagnostics | Electric Power Steering Motor Phase Sensing |
Use Scenario: In-line current verification for door lock actuators and window lift motors during CAN command execution. IC Role / Device Role / Timing Role: Low-side unidirectional monitor (REF = GND) on 24V supply, driving 12-bit SAR ADC with 10ksps sampling. Use Value: Identifies stalled motor conditions via <100µA offset-stable current signature; ±55µV VOS enables detection of 2mA leakage in harness connectors. | Use Scenario: Phase current feedback in 3-phase inverter for EPS motor torque control loop. IC Role / Device Role / Timing Role: High-bandwidth (350kHz) shunt amplifier on low-side leg, synchronized to PWM carrier for current reconstruction. Use Value: Supports field-oriented control with <1µs current-loop latency; 2V/µs slew rate prevents distortion during 10kHz PWM edge transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | Higher 80V common-mode range; 10x higher quiescent current (1.8mA); same 20V/V gain and SC70-6 package. | Required for 48V mild-hybrid systems; unsuitable for ultra-low-power always-on BMS nodes. | Select when monitoring >26V rails; avoid if <300µA supply budget is mandatory. |
| MAX40056ATA+T | 26V common-mode; 250kHz bandwidth; ±150µV offset; 3.3V–5.5V supply; 8-pin TDFN package. | Larger footprint and lower bandwidth limit use in high-frequency motor control; higher offset reduces low-current resolution. | Consider only if SC70-6 footprint is unavailable; verify layout clearance for TDFN thermal pad. |
Compared with INA185A1QDCKRQ1, INA240A1QDRQ1 extends voltage range at cost of 7× higher supply current, while MAX40056ATA+T trades bandwidth and offset performance for alternate packaging - making INA185A1QDCKRQ1 optimal for space- and power-constrained 12V/24V automotive modules requiring 350kHz fidelity.
Availability
INA185A1QDCKRQ1 is available at Aetrix Electronics and suitable for body control modules, zonal control modules, and ADAS domain controllers requiring stable component supply across automotive production lifecycles.
Supply support for INA185A1QDCKRQ1 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 decades of automotive-grade product development and AEC-Q100 validation expertise.
The INA185-Q1 product line targets cost-sensitive, space-constrained automotive current sensing - delivering precision, functional safety readiness, and extended temperature operation for next-generation vehicle electrical architectures.
FAQ
What is the maximum common-mode voltage supported by the INA185A1QDCKRQ1?
The INA185A1QDCKRQ1 supports a common-mode input voltage range of –0.2V to 26V, independent of its 2.7V–5.5V supply voltage. This allows direct high-side sensing on 24V automotive battery rails without external level-shifting circuitry. The specification is validated across the full operating temperature range of –40°C to 125°C and is not dependent on external components or layout.
Does the INA185A1QDCKRQ1 require external gain-setting resistors?
No, the INA185A1QDCKRQ1 integrates a precision-matched thin-film resistor network for its fixed 20V/V gain. This eliminates external gain components, reduces board area, and minimizes temperature-induced gain drift to ≤8 ppm/°C. The gain is factory-trimmed and specified as ±0.2% maximum error over –40°C to 125°C, ensuring consistent performance without user calibration.
How does the REF pin function in bidirectional current sensing with the INA185A1QDCKRQ1?
The REF pin sets the output voltage corresponding to zero differential input (i.e., no current flow). For bidirectional operation, REF is typically biased to mid-supply (e.g., 2.5V on 5V VS), enabling the OUT pin to swing above REF for positive current and below REF for negative current. The INA185A1QDCKRQ1 supports REF voltages from 0V to VS, and internal circuitry ensures monotonic output response across the full range without saturation artifacts.
What is the output voltage swing capability of the INA185A1QDCKRQ1 near ground?
The INA185A1QDCKRQ1 achieves a minimum output voltage of (VGND) + 0.0005V to (VGND) + 0.0035V under load, specified across –40°C to 125°C. This rail-to-rail capability preserves >99.5% of a 12-bit ADC's dynamic range when interfacing with 3.3V or 5V microcontrollers. The low 3.5mV headroom is achieved through a dedicated output stage design, not external buffering or level-shifting.
Is the INA185A1QDCKRQ1 qualified for automotive safety applications?
Yes, the INA185A1QDCKRQ1 is AEC-Q100 Grade 1 qualified (–40°C to 125°C) and explicitly documented as functional safety-capable. Texas Instruments provides FIT rate data, failure mode analysis, and safety manual support to aid ISO 26262 ASIL-B system design. Its ±0.2% gain error, 0.5µV/°C offset drift, and robust ESD ratings (HBM ±3kV, CDM ±1kV) meet requirements for safety-related current monitoring in ADAS and zonal control systems.
INA185A1QDCKRQ1 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:
- 350 kHz
- Current - Input Bias:
- 75 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 200µA
- Current - Output / Channel:
- -
- 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
INA185A1QDCKRQ1 FAQ
1.How can I place an order for INA185A1QDCKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA185A1QDCKRQ1 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 INA185A1QDCKRQ1 reliable?
The price and inventory of INA185A1QDCKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA185A1QDCKRQ1 is usually 5 days.
3.What payment methods are accepted for INA185A1QDCKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA185A1QDCKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA185A1QDCKRQ1?
INA185A1QDCKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA185A1QDCKRQ1 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 INA185A1QDCKRQ1?
For technical support, including INA185A1QDCKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA185A1QDCKRQ1 requirements.
6.How does Aetrix verify that INA185A1QDCKRQ1 is sourced from the original manufacturer or authorized distributors?
All INA185A1QDCKRQ1 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 INA185A1QDCKRQ1 meets industry standards.
7.What is the process for return or replacement of INA185A1QDCKRQ1?
All INA185A1QDCKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA185A1QDCKRQ1, 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 INA185A1QDCKRQ1 part is unused and in its original packaging.
Return procedure for INA185A1QDCKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA185A1QDCKRQ1 Tags
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