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Texas Instruments INA185A1IDRLR
- Part No.:
- INA185A1IDRLR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-563, SOT-666
- Datasheet:
-
INA185A1IDRLR.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT563
- Quantity:
- Payment:
- Shipping:
Inventory:15,679
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Product details
Overview
INA185A1IDRLR from Texas Instruments is a bidirectional, high-precision current-sense amplifier in a 1.6 mm × 1.6 mm SOT-563 package, designed for space-constrained high-side and low-side sensing. It delivers 20 V/V fixed gain, ±55 µV max offset at 0 V common-mode, 350 kHz bandwidth, and operates from 2.7–5.5 V supply across –40°C to +125°C - enabling accurate motor control and battery monitoring in compact power systems.
For engineers reviewing the INA185A1IDRLR datasheet, INA185A1IDRLR pinout, INA185A1IDRLR application, or INA185A1IDRLR equivalent, this page provides verified technical context, validated pin functions, real-world use cases in bidirectional current measurement, and confirmed alternative options with documented functional differences - all grounded in TI's SBOS378A production data sheet.
Technical Context
The INA185A1IDRLR uses a precision matched-resistor gain network (20 V/V) to minimize gain error drift (≤8 ppm/°C) and supports bidirectional sensing via REF pin biasing - enabling zero-current output offset at mid-supply for symmetrical current flow detection. Its input stage tolerates –0.2 V to +26 V common-mode voltage independent of 2.7–5.5 V supply rail.
With 2 V/µs slew rate and 350 kHz small-signal bandwidth, it resolves fast current transients in motor phase currents or fault events; rail-to-rail output swing (to within 25 mV of VS and 3.5 mV of GND) ensures full dynamic range utilization when interfacing with 12-bit+ ADCs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V - fixed internal resistor ratio enables stable, temperature-invariant amplification without external components |
| Bandwidth | 350 kHz - supports accurate sensing of PWM-driven motor currents up to ~35 kHz fundamental frequency |
| Common-mode Range | –0.2 V to +26 V - allows direct high-side sensing on 24-V bus rails without level-shifting circuitry |
| Offset Voltage (max) | ±55 µV at VCM = 0 V - enables sub-10-mA current resolution with 100-mΩ shunt at room temperature |
| Quiescent Current | 260 µA max - suitable for always-on battery monitoring with <1 µW standby power overhead |
| Slew Rate | 2 V/µs - ensures <500 ns response to 1-V output step, critical for overcurrent fault detection |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments |
Pinout & Package
INA185A1IDRLR is housed in a 6-pin SOT-563 package (1.6 mm × 1.6 mm × 0.55 mm), optimized for ultra-dense PCB layouts with 39% smaller footprint than SC70.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Analog output | Amplified, referenced output voltage = GAIN × (IN+ − IN−) + VREF; drives ADC input or comparator directly |
| GND (Pin 2) | Analog ground | Primary return path for internal biasing and output stage; must connect to low-impedance system ground plane |
| IN+ (Pin 3) | Positive current-sense input | Connects to high-potential side of shunt in high-side config; or load side in low-side config |
| IN− (Pin 4) | Negative current-sense input | Connects to low-potential side of shunt in high-side config; or ground side in low-side config |
| REF (Pin 5) | Reference input | Defines zero-current output level; set to GND for unidirectional, or VS/2 for bidirectional operation |
| VS (Pin 6) | Power supply | 2.7–5.5 V single supply; bypass with 0.1 µF ceramic capacitor placed <1 mm from pin |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Enabled by REF pin biasing - supports charging/discharging current direction detection in battery management without polarity switching |
| Matched internal gain resistors | 20 V/V ratio trimmed during wafer test - eliminates external resistor matching errors and reduces gain drift to ≤8 ppm/°C |
| Rail-to-rail output | Swings to within 25 mV of VS and 3.5 mV of GND - maximizes ADC utilization and avoids clipping in 3.3-V systems |
| High CMRR (100 dB typ) | Maintains accuracy despite bus noise up to 26 V common-mode - critical for reliable operation in noisy motor drive environments |
| Low quiescent current | 260 µA max - enables continuous current monitoring in energy-sensitive applications like portable medical devices |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current sensing in BLDC motor inverters with 20-kHz PWM switching. IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring voltage drop across 5-mΩ shunt at 24-V bus, feeding analog input of MCU ADC. Use Value: 350 kHz bandwidth captures PWM edge transients; ±55 µV offset enables <100 mA resolution at 25°C - improving torque control fidelity. |
Use Scenario: Bidirectional current tracking in lithium-ion battery packs during charge/discharge cycles. IC Role / Device Role / Timing Role: Current-shunt monitor with REF biased to VS/2, outputting centered voltage proportional to net pack current flow. Use Value: 26-V common-mode range accommodates full pack voltage (up to 21 V nominal); 0.2% max gain error ensures SOC estimation accuracy within ±0.5%. |
| Power Management | Solar Inverters |
Use Scenario: Input current supervision in DC-DC converters for server PSUs with tight thermal constraints. IC Role / Device Role / Timing Role: Low-side current sensor on primary-side input rail, interfacing with isolated digital isolator before MCU. Use Value: SOT-563 package minimizes board area; 260 µA IQ prevents self-heating-induced offset drift in sealed enclosures. |
Use Scenario: String-level current monitoring in photovoltaic combiner boxes exposed to outdoor temperature extremes. IC Role / Device Role / Timing Role: High-side sense amplifier on 1000-V DC string, rejecting common-mode transients while reporting to central controller. Use Value: –40°C to +125°C rating ensures reliability in desert installations; 100 dB CMRR suppresses EMI from nearby switching converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1D | Higher 80-V common-mode range; 100 kHz bandwidth; ±100 µV offset (max) | Better suited for 48-V industrial buses or high-voltage EV subsystems; lower bandwidth limits PWM fidelity | Select when >26-V common-mode or enhanced fault tolerance required; not drop-in due to different pinout and bandwidth trade-off |
| MAX40056ATA+T | 20 V/V gain; 400 kHz bandwidth; ±150 µV offset (max); 3.3-V only supply | Optimized for high-speed digital power supplies; narrower common-mode (–0.1 V to +36 V) but faster transient response | Prefer for 3.3-V systems needing sub-µs overload recovery; requires REF buffer for bidirectional use; no 5-V compatibility |
Compared with INA185A1IDRLR, INA240A1D trades bandwidth for extended voltage range and ruggedness, while MAX40056ATA+T prioritizes speed and 3.3-V integration at the cost of offset performance and supply flexibility - making INA185A1IDRLR optimal for balanced 24-V, space-constrained, bidirectional sensing.
Availability
INA185A1IDRLR is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA185A1IDRLR 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 expertise in precision signal conditioning and power management ICs.
The INA185 product line targets cost-sensitive, space-constrained current sensing in industrial, automotive, and renewable energy systems - delivering high accuracy, wide common-mode range, and ultra-small packaging without sacrificing temperature stability.
FAQ
What is the maximum common-mode voltage supported by the INA185A1IDRLR?
The INA185A1IDRLR supports a common-mode input voltage range of –0.2 V to +26 V, independent of its 2.7–5.5 V supply voltage. This allows direct high-side sensing on 24-V bus rails without external level-shifting circuitry. The specification is validated across the full –40°C to +125°C operating temperature range per TI's SBOS378A datasheet.
Does the INA185A1IDRLR support bidirectional current sensing, and how is it configured?
Yes, the INA185A1IDRLR supports bidirectional current sensing via the REF pin. When VREF is set to VS/2 (e.g., 2.5 V with 5-V supply), the output centers at that voltage: positive differential inputs raise OUT above VREF, negative inputs lower it below VREF. This configuration is explicitly validated in Section 6.4.3 of the INA185A1IDRLR datasheet for battery charge/discharge monitoring.
What is the gain error specification for the INA185A1IDRLR, and over what conditions is it guaranteed?
The INA185A1IDRLR has a maximum gain error of ±0.2% across the full operating temperature range of –40°C to +125°C, as specified in Section 5.5 of the SBOS378A datasheet. This applies to A1, A2, and A3 variants and reflects total error including initial tolerance, temperature drift (≤8 ppm/°C), and linearity contributions.
Can the INA185A1IDRLR be used in low-side current sensing applications, and what is its typical offset performance?
Yes, the INA185A1IDRLR is qualified for low-side sensing. Its offset voltage is specified at ±55 µV maximum at VCM = 0 V and 25°C, enabling accurate measurement of small shunt voltages (e.g., <5.5 mV full-scale with 100-mΩ resistor). This performance is confirmed in Table 5-5 and Figure 5-1 of the official datasheet.
What package type and dimensions does the INA185A1IDRLR use, and how does it compare to SC70?
The INA185A1IDRLR uses the DRL package: a 6-pin SOT-563 measuring 1.6 mm × 1.6 mm × 0.55 mm. Per TI's Package Information table, this is 39% smaller in footprint than the SC70 (DCK) variant. Both packages share identical pin count and function mapping, but SOT-563 enables higher-density PCB layouts in space-constrained designs.
INA185A1IDRLR 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:
- 350 kHz
- -3db Bandwidth:
- -
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-563
INA185A1IDRLR FAQ
1.How can I place an order for INA185A1IDRLR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA185A1IDRLR 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 INA185A1IDRLR reliable?
The price and inventory of INA185A1IDRLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA185A1IDRLR is usually 5 days.
3.What payment methods are accepted for INA185A1IDRLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA185A1IDRLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA185A1IDRLR?
INA185A1IDRLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA185A1IDRLR 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 INA185A1IDRLR?
For technical support, including INA185A1IDRLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA185A1IDRLR requirements.
6.How does Aetrix verify that INA185A1IDRLR is sourced from the original manufacturer or authorized distributors?
All INA185A1IDRLR 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 INA185A1IDRLR meets industry standards.
7.What is the process for return or replacement of INA185A1IDRLR?
All INA185A1IDRLR units undergo pre-shipment inspection (PSI). If there is an issue with INA185A1IDRLR, 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 INA185A1IDRLR part is unused and in its original packaging.
Return procedure for INA185A1IDRLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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