My Inquiry
My Account
Texas Instruments INA185A3QDCKRQ1
- Part No.:
- INA185A3QDCKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
INA185A3QDCKRQ1.pdf
- Description:
- AEC-Q100, 26-V, 350-KHZ, BI-DIRE
- Quantity:
- Payment:
- Shipping:
Inventory:2,737
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
INA185A3QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 bidirectional current-sense amplifier optimized for automotive power monitoring. It features 100V/V fixed gain, ±55µV max offset at 0V common-mode, 350kHz bandwidth, and operates from 2.7V–5.5V supply while sensing voltages across shunt resistors at –0.2V to 26V common-mode - enabling high-side and low-side current measurement in zonal controllers and ADAS domain modules.
For engineers reviewing the INA185A3QDCKRQ1 datasheet, INA185A3QDCKRQ1 pinout, INA185A3QDCKRQ1 application, or INA185A3QDCKRQ1 equivalent, key selection criteria include bidirectional sensing capability, rail-to-rail output swing (≤3.5mV to GND), ±0.2% max gain error over –40°C to 125°C, 2V/µs slew rate, and SC70-6 package compatibility with space-constrained automotive PCB layouts.
Technical Context
The INA185A3QDCKRQ1 uses a precision matched-resistor gain network to achieve 100V/V fixed gain with ±0.2% max gain error and <0.5µV/°C offset drift. Its input stage supports common-mode voltages up to 26V independent of 2.7V–5.5V supply, enabling direct connection to 12V/24V bus rails without level-shifting.
Bidirectional operation is enabled via REF pin biasing (0V to VS), allowing output to swing above or below VREF based on current direction. The device delivers 350kHz small-signal bandwidth and 2V/µs slew rate for fast transient response in motor control and fault detection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V fixed - eliminates external gain-setting resistors and reduces layout sensitivity to parasitic capacitance |
| Common-mode range | –0.2V to 26V - supports direct high-side sensing on 12V/24V automotive buses without auxiliary supplies |
| Offset voltage | ±55µV max at VCM = 0V - enables accurate sub-10mA current measurement with 10mΩ shunt |
| Bandwidth | 350kHz - captures fast current transients in BLDC motor commutation and short-circuit events |
| Slew rate | 2V/µs - ensures linear output response during rapid load-current changes without distortion |
| Quiescent current | 260µA max - minimizes standby power in always-on vehicle modules like body control units |
| Output swing | ≤3.5mV to GND, ≤26mV to VS - preserves dynamic range for ADC interfacing with 12-bit+ resolution |
Pinout & Package
INA185A3QDCKRQ1 is housed in a 6-pin SC70 (DCK) package measuring 2.00mm × 2.10mm - optimized for high-density automotive PCBs where thermal performance and board area are constrained.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Reference input | Bias point for bidirectional output: sets zero-current output level; must be buffered if sourced from high-impedance node |
| GND | Analog ground | Return path for internal circuitry and reference; requires low-impedance connection to minimize noise coupling |
| VS | Power supply | 2.7V–5.5V single supply; bypass capacitor (≥0.1µF) required adjacent to pin for stability |
| OUT | Analog output | Voltage = GAIN × (IN+ − IN−) + VREF; drives ADC inputs directly with rail-to-rail swing |
| IN− | Negative input | Connects to load side (high-side) or ground side (low-side) of sense resistor per topology |
| IN+ | Positive input | Connects to bus-voltage side (high-side) or load side (low-side) of sense resistor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to 125°C ambient operation in safety-critical automotive ECUs including ADAS domain controllers |
| Matched internal gain resistors | Eliminates external resistor matching errors and reduces temperature-induced gain drift to 1.5ppm/°C |
| Rail-to-rail output stage | Enables full utilization of 3.3V ADC reference range with only 3.5mV headroom to GND |
| Bidirectional sensing architecture | Supports charge/discharge monitoring in 12V battery management and regenerative braking systems |
| High CMRR (96dB min) | Maintains accuracy in noisy automotive environments with large common-mode transients on power rails |
Applications
| Body Control Module (BCM) | Zonal Control Module |
|---|---|
Use Scenario: Monitoring current draw of door lock actuators, window lift motors, and interior lighting loads in centralized vehicle body electronics. IC Role / Device Role / Timing Role: Bidirectional current-sense amplifier providing real-time load current feedback to microcontroller for diagnostics and PWM-controlled actuation. Use Value: Enables precise fault detection (e.g., jammed motor, short circuit) using ±55µV offset and 350kHz bandwidth to capture transient overcurrent events before fuse activation. | Use Scenario: Consolidating power distribution and monitoring across multiple vehicle domains (lighting, HVAC, infotainment) within a single zonal ECU. IC Role / Device Role / Timing Role: High-accuracy shunt-based current monitor interfaced to MCU ADC for real-time power budgeting and thermal derating decisions. Use Value: 100V/V gain and 260µA quiescent current allow simultaneous monitoring of 8+ loads with minimal PCB area and no external gain components. |
| ADAS Domain Controller | ADAS Sensor Diagnostics |
Use Scenario: Measuring supply current to radar, camera, and LiDAR subsystems to detect sensor degradation, cable faults, or EMI-induced latch-up. IC Role / Device Role / Timing Role: Precision current-sense amplifier feeding diagnostic data to ASIL-B compliant safety manager for fault classification and fail-safe response. Use Value: ±0.2% gain error and <0.5µV/°C drift ensure stable calibration over lifetime, supporting ISO 26262 functional safety requirements without periodic recalibration. | Use Scenario: Verifying correct bias current and operational integrity of front-facing camera modules and ultrasonic parking sensors during vehicle startup and runtime. IC Role / Device Role / Timing Role: Low-offset, high-bandwidth current monitor validating sensor health by comparing measured vs expected current profiles. Use Value: 350kHz bandwidth captures inrush current signatures during power-on, while bidirectional capability detects reverse-bias leakage in damaged sensor interfaces. |
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 |
|---|---|---|---|
| INA240A3QDRQ1 | Higher common-mode range (–4V to 80V), lower bandwidth (400kHz), higher quiescent current (1.8mA) | Better suited for 48V mild-hybrid systems; less optimal for space-constrained 12V BCMs due to larger SOIC-8 package | Select when monitoring >26V rails or requiring enhanced ESD robustness (HBM ±4kV); avoid if board area or standby power are critical. |
| MAX40056ATA+T | 100V/V gain, 300kHz bandwidth, ±150µV offset, SC70-6 package, but not AEC-Q100 qualified | Limited to non-safety-critical industrial or consumer applications; lacks automotive temperature grade and functional safety documentation | Consider only for cost-sensitive prototyping or non-automotive designs; not suitable for production automotive ECUs. |
Compared with INA185A3QDCKRQ1, INA240A3QDRQ1 offers wider voltage range at the expense of higher power and larger footprint, while MAX40056ATA+T provides identical gain and package but lacks AEC-Q100 validation and exhibits higher offset - making INA185A3QDCKRQ1 the optimal choice for compact, safety-compliant 12V automotive current sensing.
Availability
INA185A3QDCKRQ1 is available at Aetrix Electronics and suitable for body control modules, zonal control units, and ADAS domain controllers requiring stable component supply, automotive-grade reliability, and long-term lifecycle support.
Supply support for INA185A3QDCKRQ1 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 electronics and functional safety design.
The INA185-Q1 product line delivers high-precision, AEC-Q100-qualified current-sense amplifiers targeting space-constrained automotive power management applications including zonal architectures and ADAS subsystems.
FAQ
What is the maximum common-mode voltage supported by the INA185A3QDCKRQ1?
The INA185A3QDCKRQ1 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 12V and 24V automotive bus rails without level-shifting circuitry. The specification is validated across the full operating temperature range of –40°C to 125°C and applies specifically to the INA185A3QDCKRQ1 variant with 100V/V gain.
Does the INA185A3QDCKRQ1 require external gain-setting resistors?
No, the INA185A3QDCKRQ1 integrates a precision-matched internal resistor network configured for 100V/V fixed gain. This eliminates external gain components, reduces PCB layout sensitivity, and minimizes temperature-induced gain drift to 1.5ppm/°C. The matched network is laser-trimmed during manufacturing and applies exclusively to the INA185A3QDCKRQ1 part number.
How does the REF pin function in bidirectional current sensing with the INA185A3QDCKRQ1?
The REF pin sets the zero-current output voltage level for bidirectional operation. When biased to mid-supply (e.g., 2.5V with 5V VS), positive differential input produces OUT > VREF and negative differential input produces OUT < VREF. The INA185A3QDCKRQ1 supports REF voltages from 0V to VS, and the pin must be buffered when driven from high-impedance sources to maintain accuracy.
What is the output voltage swing specification for the INA185A3QDCKRQ1?
The INA185A3QDCKRQ1 delivers rail-to-rail output swing with a maximum of 3.5mV above GND and 26mV below VS under load (10kΩ to GND). This enables full utilization of 3.3V or 5V ADC reference ranges. The specification is guaranteed over –40°C to 125°C and applies to the A3 gain variant (100V/V) as confirmed in the INA185A3QDCKRQ1 electrical characteristics table.
Is the INA185A3QDCKRQ1 qualified for automotive safety-critical systems?
Yes, the INA185A3QDCKRQ1 is AEC-Q100 Grade 1 qualified (–40°C to 125°C) and documented as functional safety-capable per ISO 26262. Texas Instruments provides safety documentation including FMEDA reports and safety manuals to support ASIL-B system integration. This qualification is specific to the INA185A3QDCKRQ1 and verified in TI's official product folder and SBOSAI2 datasheet revision.
INA185A3QDCKRQ1 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:
- 150 kHz
- Current - Input Bias:
- 75 µA
- Voltage - Input Offset:
- 25 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
INA185A3QDCKRQ1 FAQ
1.How can I place an order for INA185A3QDCKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA185A3QDCKRQ1 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 INA185A3QDCKRQ1 reliable?
The price and inventory of INA185A3QDCKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA185A3QDCKRQ1 is usually 5 days.
3.What payment methods are accepted for INA185A3QDCKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA185A3QDCKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA185A3QDCKRQ1?
INA185A3QDCKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA185A3QDCKRQ1 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 INA185A3QDCKRQ1?
For technical support, including INA185A3QDCKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA185A3QDCKRQ1 requirements.
6.How does Aetrix verify that INA185A3QDCKRQ1 is sourced from the original manufacturer or authorized distributors?
All INA185A3QDCKRQ1 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 INA185A3QDCKRQ1 meets industry standards.
7.What is the process for return or replacement of INA185A3QDCKRQ1?
All INA185A3QDCKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA185A3QDCKRQ1, 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 INA185A3QDCKRQ1 part is unused and in its original packaging.
Return procedure for INA185A3QDCKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA185A3QDCKRQ1 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
