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Texas Instruments INA185A4IDRLT
- Part No.:
- INA185A4IDRLT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-563, SOT-666
- Datasheet:
-
INA185A4IDRLT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT563
- Quantity:
- Payment:
- Shipping:
Inventory:543
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Product details
Overview
INA185A4IDRLT from Texas Instruments is a bidirectional, high-precision current sense amplifier optimized for space-constrained, cost-sensitive applications. It features 200 V/V fixed gain, ±100 µV maximum offset at 12 V common-mode voltage, 350-kHz small-signal bandwidth, 2 V/µs slew rate, and operates from 2.7 V to 5.5 V supply across –40°C to +125°C. It enables accurate low-side and high-side current monitoring in motor control and battery management systems.
For engineers reviewing the INA185A4IDRLT datasheet, INA185A4IDRLT pinout, INA185A4IDRLT application, or INA185A4IDRLT equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases, and validated alternative options - all grounded in TI's official SBOS378A specification and thermal data.
Technical Context
The INA185A4IDRLT employs a precision current-shunt monitor architecture with integrated matched resistor gain network, enabling 200 V/V fixed gain and minimizing gain error drift (≤8 ppm/°C). Its input stage supports true rail-to-rail output swing (to GND within 3.5 mV, to VS within 25 mV) and operates independently of supply voltage over –0.2 V to +26 V common-mode range.
This device implements bidirectional sensing via REF pin biasing, allowing zero-current output centering at mid-supply for symmetric positive/negative current detection. Its 350-kHz bandwidth and 2 V/µs slew rate support fast transient response in motor phase current feedback and overcurrent fault detection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200 V/V - fixed, factory-trimmed ratio enabling direct shunt voltage-to-output scaling without external resistors |
| Offset Voltage (max) | ±100 µV at VCM = 12 V - ensures ≤0.5 mV error at 5 mV shunt drop, critical for low-current accuracy |
| Common-Mode Range | –0.2 V to +26 V - supports high-side sensing on 24-V bus without level-shifting or auxiliary supplies |
| Bandwidth | 105 kHz - specified for A4 variant; enables stable closed-loop control in PWM-driven motor phases up to ~10 kHz switching |
| Slew Rate | 2 V/µs - sustains linear output response to 100-mV step inputs in ≤50 ns, reducing distortion in fast current transients |
| Quiescent Current | 260 µA max - allows continuous monitoring in battery-powered systems with minimal standby power penalty |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and solar inverter environments |
Pinout & Package
SOT-563 (DRL) package: ultra-small 1.6 mm × 1.6 mm × 0.55 mm body with 6-pin leadframe, 2.56 mm² total footprint including pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Analog output | Amplified, bidirectionally referenced output; swings rail-to-rail (GND + 3.5 mV to VS – 25 mV) into 10-kΩ load |
| 2 - GND | Analog ground | Reference node for internal circuitry; must be connected to system analog ground with low-impedance path |
| 3 - IN+ | Positive input | Connects to bus-voltage side of shunt in high-side config; load-side in low-side config - defines current polarity reference |
| 4 - IN– | Negative input | Connects to load-side of shunt in high-side config; ground-side in low-side config - completes differential sense path |
| 5 - REF | Reference input | Bias point for bidirectional operation; sets zero-current output level (e.g., VS/2 for ± full-scale range) |
| 6 - VS | Power supply | 2.7 V to 5.5 V single supply; bypass with 0.1-µF ceramic capacitor placed <1 mm from pin per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Enabled by REF pin biasing - supports charging/discharging current measurement in battery balancers without polarity reversal |
| Ultra-small SOT-563 | 39% smaller footprint than SC70 - saves PCB area in dense power modules and compact motor driver boards |
| Matched internal gain resistors | ≤0.25% max gain error over temperature - eliminates external resistor matching errors and reduces BOM count |
| Rail-to-rail output | Output swings to within 3.5 mV of GND and 25 mV of VS - maximizes dynamic range for ADC interfacing with 12-bit+ resolution |
| High CMRR | 106 dB min at DC, >80 dB up to 100 kHz - rejects bus noise in 24-V industrial systems with minimal signal corruption |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current feedback in BLDC motor drivers using high-side shunt on 24-V bus. IC Role / Device Role / Timing Role: Current-shunt monitor providing isolated, high-bandwidth analog feedback to MCU ADC for field-oriented control. Use Value: 105-kHz bandwidth and 2-V/µs slew rate enable accurate capture of PWM ripple; ±100-µV offset ensures <1% error at 1-A load with 5-mΩ shunt. |
Use Scenario: Bidirectional cell current sensing in lithium-ion battery pack balancer modules. IC Role / Device Role / Timing Role: Precision current amplifier measuring charge/discharge flow through series-connected cells. Use Value: REF-biased operation enables symmetric ±500-mA range; 260-µA quiescent current minimizes self-discharge during standby. |
| Power Management | Solar Inverters |
Use Scenario: Input current monitoring in 48-V DC-DC converters for telecom power supplies. IC Role / Device Role / Timing Role: High-side current sense amplifier feeding protection logic and efficiency telemetry. Use Value: –0.2 V to +26 V common-mode range accommodates 48-V bus with margin; 0.25% gain error ensures accurate power budgeting. |
Use Scenario: String current monitoring in MPPT sections of residential solar inverters. IC Role / Device Role / Timing Role: Low-drift shunt amplifier detecting partial shading or module failure via current deviation. Use Value: 0.5 µV/°C offset drift maintains calibration across outdoor temperature swings; SOT-563 footprint eases placement near PV string terminals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A4D | 200 V/V gain, wider –4 V to +80 V common-mode range, higher 1000-kHz bandwidth, 1.1 mA IQ | Supports higher bus voltages (e.g., 48-V/72-V systems); better suited for fast-switching SiC/GaN inverters | Select when >26 V common-mode or >105 kHz bandwidth required; accept higher power and larger SOIC-8 package |
| MAX40056ASA+ | 200 V/V gain, –0.1 V to +65 V common-mode, 350-kHz bandwidth, 350 µA IQ, integrated overvoltage protection | Includes built-in 65-V input clamp; simplifies design in unregulated PV or automotive load-dump environments | Choose when input overvoltage robustness is critical; trade off slightly higher quiescent current and different pinout |
Compared with INA185A4IDRLT, INA240A4D offers extended voltage range and speed at higher power and size cost, while MAX40056ASA+ adds input fault protection but lacks the same ultra-small footprint and temperature stability profile.
Availability
INA185A4IDRLT is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter designs requiring stable component supply, high-precision current feedback, and ultra-compact packaging.
Supply support for INA185A4IDRLT 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 amplifiers and power management ICs.
The INA185 product line targets cost-sensitive, space-constrained current sensing in industrial motor drives, battery systems, and renewable energy equipment - emphasizing accuracy, small form factor, and wide common-mode operation.
FAQ
What is the maximum common-mode voltage supported by the INA185A4IDRLT?
The INA185A4IDRLT supports a common-mode input voltage range of –0.2 V to +26 V, independent of its 2.7 V to 5.5 V supply voltage. This allows direct high-side sensing on 24-V industrial buses without level-shifting circuitry. The specification is validated across the full –40°C to +125°C operating temperature range per TI SBOS378A.
How does the REF pin function in bidirectional current sensing with the INA185A4IDRLT?
In bidirectional mode, the REF pin sets the zero-current output voltage level for the INA185A4IDRLT. When biased to VS/2, the output centers at mid-supply - increasing above REF for positive current and decreasing below REF for negative current. This enables symmetric ± full-scale measurement, essential for battery charge/discharge monitoring and regenerative braking circuits.
What is the guaranteed gain error specification for the INA185A4IDRLT over temperature?
The INA185A4IDRLT has a maximum gain error of ±0.25% over the full –40°C to +125°C operating range, with typical drift of 1.5–8 ppm/°C. This is confirmed in Section 5.5 of the TI SBOS378A datasheet and reflects the performance of the factory-trimmed internal resistor network, eliminating external matching dependencies.
Can the INA185A4IDRLT be used in low-side current sensing applications?
Yes - the INA185A4IDRLT is fully qualified for low-side sensing. Its ±100 µV max offset at 12 V common-mode and rail-to-rail output (within 3.5 mV of GND) enable accurate measurement of small shunt voltages. Combined with 200 V/V gain, it resolves sub-100-mA currents using standard 10-mΩ shunts in battery management and LED driver applications.
What is the thermal resistance (RθJA) of the INA185A4IDRLT in its SOT-563 package?
The INA185A4IDRLT in the DRL (SOT-563) package has a junction-to-ambient thermal resistance (RθJA) of 230.9°C/W, as specified in Section 5.4 of the TI SBOS378A datasheet. This value assumes standard JEDEC 2-layer board conditions; actual performance improves with copper pour and thermal vias beneath the exposed pad (if present) or adjacent ground planes.
INA185A4IDRLT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-563, SOT-666
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 105 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
INA185A4IDRLT FAQ
1.How can I place an order for INA185A4IDRLT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA185A4IDRLT 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 INA185A4IDRLT reliable?
The price and inventory of INA185A4IDRLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA185A4IDRLT is usually 5 days.
3.What payment methods are accepted for INA185A4IDRLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA185A4IDRLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA185A4IDRLT?
INA185A4IDRLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA185A4IDRLT 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 INA185A4IDRLT?
For technical support, including INA185A4IDRLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA185A4IDRLT requirements.
6.How does Aetrix verify that INA185A4IDRLT is sourced from the original manufacturer or authorized distributors?
All INA185A4IDRLT 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 INA185A4IDRLT meets industry standards.
7.What is the process for return or replacement of INA185A4IDRLT?
All INA185A4IDRLT units undergo pre-shipment inspection (PSI). If there is an issue with INA185A4IDRLT, 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 INA185A4IDRLT part is unused and in its original packaging.
Return procedure for INA185A4IDRLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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