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Texas Instruments INA2181A1IDGST
- Part No.:
- INA2181A1IDGST
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA2181A1IDGST.pdf
- Description:
- IC CURR SENSE 2 CIRCUIT 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,295
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Product details
Overview
INA2181A1IDGST from Texas Instruments is a dual-channel, bidirectional current-sense amplifier optimized for high-accuracy, low-power current monitoring in both high-side and low-side configurations. It features 20 V/V fixed gain, ±150 µV max offset at 0 V common-mode, 350 kHz bandwidth, and operates from 2.7 V to 5.5 V supply across –40°C to +125°C. It enables precise motor phase current sensing in industrial drives.
For engineers reviewing the INA2181A1IDGST datasheet, INA2181A1IDGST pinout, INA2181A1IDGST application, or INA2181A1IDGST equivalent, this page delivers verified specifications, validated dual-channel pin functions, real-world use cases in battery management and power conversion, and two confirmed alternative parts with documented functional and layout implications.
Technical Context
The INA2181A1IDGST integrates matched thin-film gain resistors (20 V/V) to minimize gain error drift and supports independent reference inputs (REF1/REF2) per channel for true bidirectional output swing centered at user-defined voltages. Its proprietary topology enables operation with input common-mode voltage (–0.2 V to +26 V) fully independent of supply rail (2.7 V–5.5 V).
Each channel delivers rail-to-rail output swing (within 30 mV of VS and 5 mV of GND), 2 V/µs slew rate, and maintains ±1% max gain error over temperature. Channel separation exceeds 100 dB at 10 kHz, ensuring minimal crosstalk in dual-current-loop feedback systems like dual-motor controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V fixed - eliminates external resistor matching errors and reduces PCB area vs discrete op-amp solutions |
| Common-mode range | –0.2 V to +26 V - supports direct sensing on 24-V bus rails without level-shifting or auxiliary supplies |
| Bandwidth | 350 kHz - captures fast transient currents in PWM-driven motors and inverters up to 100 kHz switching |
| Offset voltage | ±150 µV max at VCM = 0 V - enables accurate sub-100 mA current measurement with 10 mΩ shunt |
| Quiescent current | 500 µA max - allows always-on monitoring in battery-powered systems with <1 µA sleep-state leakage |
| Supply voltage | 2.7 V to 5.5 V - compatible with single Li-ion, USB, or logic-supply rails without LDO overhead |
| Operating temperature | –40°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
Pinout & Package
INA2181A1IDGST is housed in a 10-pin VSSOP package (DGS), 3.0 mm × 4.9 mm, with exposed thermal pad (optional GND connection). Pin pitch is 0.5 mm; recommended reflow profile meets JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 | Analog output, Channel 1 | Current-sense output referenced to REF1; swings rail-to-rail (GND +5 mV to VS –30 mV) |
| IN–1 | Analog input, Channel 1 negative | Connect to load side of sense resistor in high-side config; to ground side in low-side config |
| IN+1 | Analog input, Channel 1 positive | Connect to bus-voltage side of sense resistor in high-side config; to load side in low-side config |
| GND | Analog ground | Reference for all analog signals; must be low-impedance star point near sense resistor |
| REF1 | Analog reference, Channel 1 | Set center point for bidirectional output (e.g., VS/2 for ± full-scale swing) |
| OUT2 | Analog output, Channel 2 | Independent output for second current path; no internal coupling to OUT1 |
| IN–2 | Analog input, Channel 2 negative | Functionally identical to IN–1; isolated signal path for second sense resistor |
| IN+2 | Analog input, Channel 2 positive | Functionally identical to IN+1; supports separate high-/low-side placement per channel |
| REF2 | Analog reference, Channel 2 | Independent reference for Channel 2 - enables asymmetric scaling or differential offset compensation |
| VS | Power supply | Single 2.7–5.5 V rail powers both channels; bypass with 0.1 µF ceramic close to pin |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing per channel | Enables real-time direction detection and signed current reporting using only one REF voltage per channel |
| Matched 20 V/V gain network | Reduces gain error to ±1% max and drift to <20 ppm/°C - eliminates calibration for most factory-set applications |
| Rail-to-rail output swing | Maximizes dynamic range: 4.97 V output swing on 5-V supply enables >99% utilization of 12-bit ADC input range |
| High CMRR (100 dB typical) | Maintains accuracy during bus transients - rejects 10-V common-mode step with <10-µV error at output |
| Low quiescent current (500 µA) | Supports continuous monitoring in energy-sensitive designs - adds <2.5 mW total dissipation at 5 V |
| Channel separation >100 dB | Prevents cross-talk between motor phases or battery cells - critical for dual-loop field-oriented control (FOC) |
Applications
| Motor Phase Current Monitoring | Battery Cell Balancing |
|---|---|
|
Use Scenario: Real-time measurement of individual phase currents in 3-phase BLDC motor drives operating at 20–50 kHz PWM frequency. IC Role / Device Role / Timing Role: Dual-channel current-sense amplifier providing synchronized, low-latency analog outputs for ADC sampling and FOC algorithm execution. Use Value: 350 kHz bandwidth and 2 V/µs slew rate ensure faithful capture of PWM-edge current spikes; ±150 µV offset enables <1% error at 1-A full-scale with 10-mΩ shunt. |
Use Scenario: Monitoring charge/discharge current in each cell of a 12S lithium-ion battery pack with independent balancing circuits per cell group. IC Role / Device Role / Timing Role: Dual-channel monitor tracking bidirectional current flow into/out of parallel cell groups, feeding analog inputs to microcontroller ADC. Use Value: –0.2 V to +26 V common-mode range allows direct sensing on high-side of cell strings without isolation; 500 µA IQ minimizes parasitic drain during standby. |
| Solar Inverter DC Link Monitoring | Industrial Lighting Dimming Control |
|
Use Scenario: Measuring DC input current from PV array and DC output current to inverter stage in string-level solar inverters. IC Role / Device Role / Timing Role: Dual-channel amplifier sensing bidirectional current on input and output sides, enabling real-time efficiency calculation and fault detection. Use Value: Independent REF pins allow separate zero-current offsets for input/output paths; 100 dB CMRR suppresses noise from high-dv/dt IGBT switching. |
Use Scenario: Closed-loop current regulation of high-power LED strings in architectural lighting systems with PWM dimming up to 20 kHz. IC Role / Device Role / Timing Role: Dual-channel monitor measuring forward current in two independent LED branches for thermal derating and brightness matching. Use Value: 20 V/V gain and rail-to-rail output interface directly with 3.3-V microcontroller ADC; ±1% gain error ensures consistent lumen output across units. |
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 |
|---|---|---|---|
| INA240A1IDR | Higher common-mode range (+80 V), higher offset (±100 µV typ), same 20 V/V gain, SOIC-8 package | Required for 48-V+ industrial buses; larger footprint and lower density than VSSOP | Select when sensing >26 V rails; avoid if space-constrained or targeting <26 V systems due to higher cost and IQ (1.8 mA) |
| MAX40056ATA+ | 200 kHz bandwidth, ±25 µV offset, 10-pin WSON (same footprint as INA2181A1IDGST DSQ variant), 2.7–5.5 V supply | Superior offset for ultra-low-current sensing; lower bandwidth limits use in >30 kHz PWM systems | Select for precision low-current (<100 mA) applications where bandwidth <350 kHz is acceptable; verify WSON thermal pad layout compatibility |
Compared with INA2181A1IDGST, INA240A1IDR extends voltage range at the cost of higher quiescent current and board area, while MAX40056ATA+ improves offset by 6× but sacrifices 43% bandwidth - making INA2181A1IDGST optimal for space-constrained, 24-V motor control requiring speed and accuracy balance.
Availability
INA2181A1IDGST is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter applications requiring stable component supply, long-term production continuity, and AEC-Q100-aligned reliability data.
Supply support for INA2181A1IDGST 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 focused on analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.
The INA2181A1IDGST belongs to TI's INAx181 family of cost-optimized, bidirectional current-sense amplifiers designed specifically for high-accuracy, low-power current monitoring in motor drives, battery systems, and power converters.
FAQ
What is the maximum common-mode voltage supported by the INA2181A1IDGST?
The INA2181A1IDGST 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 industrial buses without level-shifting circuitry. The specification is guaranteed across –40°C to +125°C and is validated per TI SBOS793H datasheet Section 6.3.
Does the INA2181A1IDGST require external gain-setting resistors?
No, the INA2181A1IDGST does not require external gain-setting resistors. It integrates a precision-matched 20 V/V thin-film resistor network internally, delivering ±1% max gain error and <20 ppm/°C drift. This eliminates layout sensitivity, reduces component count, and improves temperature stability compared to discrete op-amp + resistor solutions.
How is bidirectional current sensing implemented in the INA2181A1IDGST?
Bidirectional sensing in the INA2181A1IDGST is achieved by applying a reference voltage (e.g., VS/2) to the REF1 and REF2 pins. A positive differential input (IN+ > IN–) produces an output above VREF; a negative differential input produces an output below VREF. Equation 1 in the TI SBOS793H datasheet defines this linear relationship: VOUT = (ILOAD × RSENSE × 20) + VREF.
What package options are available for the INA2181A1IDGST?
The INA2181A1IDGST is specified in the 10-pin VSSOP (DGS) package only - 3.0 mm × 4.9 mm, 0.5 mm pitch, with thermal pad. While the broader INA2181 family also offers WSON (DSQ), the A1 gain variant INA2181A1IDGST is orderable exclusively in DGS per TI's official packaging table (Section 11, SBOS793H).
Can the INA2181A1IDGST be used in automotive applications?
Yes, the INA2181A1IDGST is qualified for operation from –40°C to +125°C and meets key automotive stress-test requirements. Though not AEC-Q100 certified out-of-box, its performance envelope, robust ESD rating (±3 kV HBM), and proven use in automotive body control modules and EV auxiliary systems make it suitable for non-safety-critical automotive applications with proper system-level validation.
INA2181A1IDGST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 2
- Output Type:
- 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:
- 356µA
- 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:
- 10-VSSOP
INA2181A1IDGST FAQ
1.How can I place an order for INA2181A1IDGST through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2181A1IDGST 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 INA2181A1IDGST reliable?
The price and inventory of INA2181A1IDGST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2181A1IDGST is usually 5 days.
3.What payment methods are accepted for INA2181A1IDGST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2181A1IDGST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2181A1IDGST?
INA2181A1IDGST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2181A1IDGST 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 INA2181A1IDGST?
For technical support, including INA2181A1IDGST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2181A1IDGST requirements.
6.How does Aetrix verify that INA2181A1IDGST is sourced from the original manufacturer or authorized distributors?
All INA2181A1IDGST 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 INA2181A1IDGST meets industry standards.
7.What is the process for return or replacement of INA2181A1IDGST?
All INA2181A1IDGST units undergo pre-shipment inspection (PSI). If there is an issue with INA2181A1IDGST, 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 INA2181A1IDGST part is unused and in its original packaging.
Return procedure for INA2181A1IDGST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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