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Texas Instruments INA185A3IDRLR
- Part No.:
- INA185A3IDRLR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-563, SOT-666
- Datasheet:
-
INA185A3IDRLR.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT563
- Quantity:
- Payment:
- Shipping:
Inventory:6,882
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Product details
Overview
INA185A3IDRLR from Texas Instruments is a bidirectional, high-precision current sense amplifier optimized for space-constrained, cost-sensitive applications. It delivers 100 V/V fixed gain, ±55 µV max offset voltage at 0 V common-mode, 350-kHz bandwidth (A1 variant), and operates from –0.2 V to +26 V common-mode range with 2.7–5.5 V supply. It enables accurate low-side and high-side current monitoring in motor control and battery management systems.
For engineers reviewing the INA185A3IDRLR datasheet, INA185A3IDRLR pinout, INA185A3IDRLR application, or INA185A3IDRLR equivalent, this page provides verified specifications, SOT-563 package details, bidirectional sensing implementation guidance, and validated alternative options for precision current measurement designs.
Technical Context
The INA185A3IDRLR employs a matched internal resistor gain network to achieve ±0.2% max gain error and 0.5 µV/°C offset drift over –40°C to +125°C. Its architecture supports both unidirectional (REF = GND) and bidirectional (REF biased mid-supply) operation via the dedicated REF pin, enabling zero-current output centering.
It features rail-to-rail output swing (within 25 mV of VS and 3.5 mV of GND), 2 V/µs slew rate, and 40 nV/√Hz input-referred voltage noise - all while drawing only 260 µA max quiescent current. The device maintains CMRR ≥96 dB across its full –0.2 V to +26 V common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100 V/V - fixed ratio; eliminates external gain-setting resistors and associated tolerance/temperature drift. |
| Common-mode range | –0.2 V to +26 V - enables direct high-side sensing on 24-V bus without level-shifting or isolation. |
| Bandwidth | 150 kHz - specified for A3 variant; supports fast transient detection in motor phase current or fault response. |
| Offset voltage | ±55 µV max at VCM = 0 V - enables accurate sub-milliohm shunt use with <1 mA resolution at 100× gain. |
| Supply voltage | 2.7 V to 5.5 V - compatible with 3.3-V and 5-V microcontroller I/O domains and ADC reference rails. |
| Quiescent current | 260 µA max - allows continuous monitoring in battery-powered systems with minimal standby drain. |
| Output swing | Within 25 mV of VS and 3.5 mV of GND - maximizes dynamic range for 12-bit+ ADC digitization. |
Pinout & Package
SOT-563 (DRL) package: ultra-small 1.6 mm × 1.6 mm × 0.55 mm footprint, 6-pin surface-mount, 2.56 mm² total area including pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Analog output | Amplified, referenced output voltage: VOUT = GAIN × (VIN+ − VIN−) + VREF; drives ADC or comparator directly. |
| GND (Pin 2) | Analog ground | Primary return path for internal circuitry; must be connected to low-impedance system ground near sense resistor. |
| IN+ (Pin 3) | Positive input | Connects to bus-voltage side of shunt in high-side config; load-side in low-side config - defines current polarity convention. |
| IN− (Pin 4) | Negative input | Connects to load-side of shunt in high-side config; ground-side in low-side config - completes differential sense path. |
| REF (Pin 5) | Reference input | DC bias point for output; sets zero-current output level (e.g., 2.5 V for bidirectional ±2.5 V swing with 5-V supply). |
| VS (Pin 6) | Power supply | 2.7–5.5 V analog supply; requires local 0.1-µF ceramic bypass capacitor placed within 2 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Enabled by REF pin biasing - supports charging/discharging current direction detection in battery systems without hardware change. |
| Matched internal gain resistors | Eliminates external resistor matching errors; achieves ±0.2% max gain error and <8 ppm/°C gain drift over temperature. |
| Rail-to-rail output stage | Delivers usable signal swing down to 3.5 mV above GND and 25 mV below VS - preserves >98% of 0–5 V ADC range. |
| High CMRR (≥96 dB) | Maintains accuracy despite bus noise or ground bounce up to 26 V common-mode - critical for noisy motor drive environments. |
| Low quiescent power | 260 µA max consumption enables always-on current monitoring in energy-sensitive IoT and portable devices. |
Applications
| Motor Phase Current Monitoring | Battery Pack Balancing |
|---|---|
Use Scenario: Real-time measurement of individual motor phase currents in BLDC inverters for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-bandwidth (150 kHz), bidirectional current-sense amplifier interfacing between shunt resistor and MCU ADC. Use Value: Enables precise torque ripple suppression and overcurrent protection with <10 µs response to current transients. |
Use Scenario: Monitoring cell-level charge/discharge currents in multi-cell Li-ion battery packs for active balancing algorithms. IC Role / Device Role / Timing Role: Bidirectional current monitor with REF-biased output feeding isolated sigma-delta ADC. Use Value: Achieves ±0.5% current accuracy across –40°C to +85°C, supporting tight state-of-charge (SoC) estimation. |
| Industrial Power Supply OCP | Solar Microinverter DC Link Sensing |
Use Scenario: Fast overcurrent protection in 24-V industrial SMPS using shunt-based primary-side current limiting. IC Role / Device Role / Timing Role: Unidirectional current amplifier driving comparator threshold with <20 µs fault response. Use Value: Provides 350-kHz small-signal bandwidth and 2 V/µs slew rate to detect hard shorts before MOSFET destruction. |
Use Scenario: Bidirectional DC link current sensing in solar microinverters to monitor MPPT efficiency and anti-islanding compliance. IC Role / Device Role / Timing Role: High-common-mode (up to 26 V), low-drift current sense amplifier feeding isolated ADC. Use Value: Delivers ±55 µV offset and 0.5 µV/°C drift to maintain <0.1% energy measurement accuracy over 25-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3IDR | Higher common-mode range (–4 V to +80 V); 100 V/V gain; 100 kHz bandwidth; 500 µA IQ. | Better suited for 48-V automotive or industrial bus monitoring; higher power consumption limits battery use. | Select when sensing >26 V rails or requiring enhanced ESD robustness (±4 kV HBM). |
| MAX40056ATA+T | 100 V/V gain; 300 kHz bandwidth; ±15 µV max offset at 25°C; 3.3-V only supply (2.7–5.5 V not supported). | Superior offset performance at room temperature; lacks extended temperature rating (–40°C to +125°C). | Prefer for precision lab equipment where ambient temperature is controlled and 3.3-V supply is fixed. |
Compared with INA185A3IDRLR, INA240A3IDR offers wider common-mode range but higher quiescent current, while MAX40056ATA+T delivers lower offset at 25°C but lacks full industrial temperature support and flexible supply voltage - making INA185A3IDRLR optimal for cost-sensitive, wide-temp, dual-supply embedded systems.
Availability
INA185A3IDRLR is available at Aetrix Electronics and suitable for motor control, battery management, and solar inverter applications requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.
Supply support for INA185A3IDRLR 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, power management, and signal chain solutions.
The INA185 product line targets space-constrained, cost-sensitive current sensing in industrial, automotive, and renewable energy systems - delivering high accuracy, wide common-mode range, and ultra-small packaging without sacrificing performance.
FAQ
What is the maximum common-mode voltage supported by the INA185A3IDRLR?
The INA185A3IDRLR supports a common-mode input voltage range from –0.2 V to +26 V. This specification is independent of the supply voltage (2.7–5.5 V), enabling direct high-side sensing on 24-V industrial buses. Operation beyond ±0.2 V at the negative rail or above +26 V violates absolute maximum ratings and may cause permanent damage.
How does the REF pin function in the INA185A3IDRLR?
The REF pin in the INA185A3IDRLR sets the output voltage baseline for zero differential input: VOUT = 100 × (VIN+ − VIN−) + VREF. When tied to GND, it enables unidirectional sensing; when biased to VS/2, it enables bidirectional operation with symmetric positive/negative current reporting. The pin accepts 0 V to VS and must be buffered for low-impedance drive.
What is the bandwidth of the INA185A3IDRLR, and how does it differ from other INA185 variants?
The INA185A3IDRLR has a small-signal bandwidth of 150 kHz, as specified for the A3 gain variant (100 V/V). This is lower than the A1 variant (350 kHz at 20 V/V) due to gain-bandwidth trade-off. Bandwidth is measured with CLOAD = 10 pF and defines the frequency at which closed-loop gain drops by 3 dB - critical for transient response in motor control loops.
Can the INA185A3IDRLR be used in low-side current sensing configurations?
Yes, the INA185A3IDRLR is fully supported for low-side current sensing. Its –0.2 V minimum common-mode voltage allows connection to ground-referenced shunts. With ±55 µV max offset at 0 V common-mode, it achieves high accuracy even with milliohm-level shunt resistors, minimizing power loss while maintaining resolution for sub-amp current ranges.
What package type is used for the INA185A3IDRLR, and what are its key mechanical dimensions?
The INA185A3IDRLR uses the SOT-563 (DRL) package: a 6-pin, ultra-small outline transistor package measuring 1.6 mm × 1.6 mm × 0.55 mm with 0.5-mm pitch. Total footprint including pins is 2.56 mm² - 39% smaller than SC70. Pin 1 is OUT; pin orientation follows standard SOT-563 top-view marking convention per TI SBOS378A.
INA185A3IDRLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-563, SOT-666
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 150 kHz
- -3db Bandwidth:
- -
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-563
INA185A3IDRLR FAQ
1.How can I place an order for INA185A3IDRLR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA185A3IDRLR 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 INA185A3IDRLR reliable?
The price and inventory of INA185A3IDRLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA185A3IDRLR is usually 5 days.
3.What payment methods are accepted for INA185A3IDRLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA185A3IDRLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA185A3IDRLR?
INA185A3IDRLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA185A3IDRLR 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 INA185A3IDRLR?
For technical support, including INA185A3IDRLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA185A3IDRLR requirements.
6.How does Aetrix verify that INA185A3IDRLR is sourced from the original manufacturer or authorized distributors?
All INA185A3IDRLR 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 INA185A3IDRLR meets industry standards.
7.What is the process for return or replacement of INA185A3IDRLR?
All INA185A3IDRLR units undergo pre-shipment inspection (PSI). If there is an issue with INA185A3IDRLR, 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 INA185A3IDRLR part is unused and in its original packaging.
Return procedure for INA185A3IDRLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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