INA2181A2IDGSR - Dual 26V 350kHz Current Sense Amp | TI
MPN: INA2181A2IDGSR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.31 | $0.31 |
| 10 | $0.28 | $2.80 |
| 100 | $0.25 | $25.00 |
| 500 | $0.22 | $110.00 |
| 1,000 | $0.19 | $190.00 |
Drop-in alternatives for INA2181A2IDGSR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
INA2181A2QDGSRQ1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.52 / Unit
View Datasheet →INA2181A1QDGSRQ1
✅ Drop-In✓ In Stock
$0.35 / Unit
View Datasheet →INA2181A4QDGSRQ1
✅ Drop-In✓ In Stock
$0.72 / Unit
View Datasheet →INA2181A1IDGSR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.52 / Unit
View Datasheet →INA2181A3IDGSR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.29 / Unit
View Datasheet →INA2181A4IDGSR
✅ Drop-In📋 Reference alternative (not in catalog)
INA2181A2IDGSR Maximum Ratings & Electrical Characteristics
| Channels | 2 (dual channel) |
| Gain (fixed) | 50 V/V (A2 option) |
| Bandwidth | 350 kHz |
| Common-Mode Voltage Range | -0.2 V to +26 V |
| Sensing Direction | Bidirectional |
| Sensing Topology | Low-side and High-side |
| Output Type | Voltage output, rail-to-rail |
| Operating Temperature | -40C to +125C |
| Package | VSSOP-10 (DGS), 3.00 mm width |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Reel Size | 3000 units per reel (R suffix) |
| Typical Applications | Battery current monitoring, power-supply supervision, load current feedback |
INA2181A2IDGSR vssop-10 (dgs), 3.00 mm width Pin Configuration Guide
Complete pinout information for INA2181A2IDGSR (vssop-10 (dgs), 3.00 mm width package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for INA2181A2IDGSR.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
INA2181A2IDGSR is suitable for 6 applications: Battery Charge/Discharge Monitoring, Motor Drive Current Feedback, Notebook and Tablet Power Supervision, Telecom and Server Rail Monitoring, Industrial Current Loop Diagnostics, Automotive Body and Powertrain Current Sensing.
Battery Charge/Discharge Monitoring
The INA2181A2IDGSR is well suited to battery current monitoring because its bidirectional architecture reports both charge and discharge current through one shunt resistor, with the REF pin set to a mid-scale reference to center the output at zero current. Its -0.2 V to +26 V common-mode range covers single-cell and multi-cell stacks regardless of the 3-5 V amplifier supply. The dual channels let a single device monitor the charging path and the load path independently. With 50 V/V gain, a 20 mV shunt drop at full load maps to 1 V of output swing; place the device between the shunt and the MCU ADC, and rely on the 350 kHz bandwidth to capture inrush transients that average current telemetry would miss.
Recommended
Motor Drive Current Feedback
In brushed and BLDC motor controllers, phase or bus current must be measured quickly to implement current-limiting and torque loops. The INA2181A2IDGSR provides two channels, allowing simultaneous monitoring of two shunts, with 350 kHz bandwidth that tracks PWM ripple and fast fault currents. High-side shunt placement is supported by the 26 V common-mode range, independent of the amplifier supply, which simplifies layout in 12 V and 24 V motor buses. With 50 V/V gain, a 30 mV full-scale shunt drop yields 1.5 V output, well within a 3.3 V ADC range. Place the amplifier close to the shunt with Kelvin connections, and filter the output with a simple RC matched to the control loop bandwidth to reject PWM noise.
Recommended
Notebook and Tablet Power Supervision
Portable computer designs monitor battery, system rail, and charger currents simultaneously, and the INA2181A2IDGSR condenses two of these measurements into one 3x3 mm VSSOP-10 device. Its cost-optimized INAx181 family positioning targets exactly this high-volume, price-sensitive application. The -0.2 V to 26 V common-mode range handles battery stacks and adapter inputs, while the rail-to-referenced voltage output connects directly to a fuel gauge or PMIC ADC input without level shifting. The 350 kHz bandwidth captures load transients for platform power management. Choose the shunt so that light-load currents still generate measurable shunt drops, since the 50 V/V gain sets the resolution ceiling; heavier loads can use smaller shunts to limit dissipation.
Recommended
Telecom and Server Rail Monitoring
Telecom -48 V-derived and server 12 V rails require continuous current supervision for load management and fault detection. The INA2181A2IDGSR monitors high-side shunts at up to 26 V common-mode from a low-voltage supply, and its dual channels can watch two rails with one device, cutting BOM cost. The 350 kHz bandwidth detects fast overcurrent events before protection circuitry trips, and the voltage output feeds comparators or supervisory MCUs directly. With 50 V/V gain, select shunt resistance so maximum load current produces roughly 1-2 V output within the ADC or comparator window. Maintain Kelvin sensing across the shunt and keep the input traces short and paired to limit noise pickup in the electrically noisy server environment.
Recommended
Industrial Current Loop Diagnostics
Industrial control panels use current monitoring for predictive maintenance, actuator health, and overload detection on 24 V buses. The INA2181A2IDGSR's 26 V common-mode ceiling and -40C to +125C rating suit these environments, and dual channels let one device watch a motor branch and a heater branch simultaneously. The voltage output scales with 50 V/V gain, so a 40 mV full-scale shunt drop provides 2 V into a PLC analog input. Its 350 kHz bandwidth catches fast fault signatures such as locked-rotor inrush. Filter the output with an RC matched to the diagnostic sampling rate, and consider the Q1 automotive variant (INA2181A2QDGSRQ1) when the same board is reused in vehicle-mounted industrial equipment requiring AEC-Q100 qualification.
Recommended
Automotive Body and Powertrain Current Sensing
For automotive 12 V loads such as lamps, pumps, and actuators, the AEC-Q100 qualified INA2181A2QDGSRQ1 drop-in variant of this device provides the same 50 V/V gain, 26 V common-mode range, and 350 kHz bandwidth with automotive qualification. The bidirectional sensing covers regenerative and load-dump current directions with a single shunt. Designers validate the footprint once and can then qualify either the standard INA2181A2IDGSR for industrial derivatives or the Q1 part for vehicle platforms. With 50 V/V gain, shunt values of a few milliohms produce usable full-scale outputs; ensure the shunt power rating accounts for peak fault currents, and use the amplifier output to trigger the body-controller ADC for threshold-based protection.
Recommended
Recommended Products Summary
Engineering reference data for INA2181A2IDGSR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA2181A2QDGSRQ1 | INA2181A1QDGSRQ1 | INA2181A1IDGSR | INA2181A4IDGSR |
|---|---|---|---|---|---|
| Package | VSSOP-10 (DGS) | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Fixed Gain | 50 V/V (A2) | 50 V/V (A2) | 20 V/V (A1) | 20 V/V (A1) | 200 V/V (A4) |
| Channels | 2 | 2 | 2 | 2 | 2 |
| Common-Mode Range | -0.2 V to +26 V | -0.2 V to +26 V | -0.2 V to +26 V | -0.2 V to +26 V | -0.2 V to +26 V |
| Bandwidth | 350 kHz | 350 kHz | 350 kHz family | 350 kHz family | 350 kHz family |
| AEC-Q100 Qualified | No (standard grade) | Yes | Yes | No | No |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Key Differentiators
- Dual channels in a 3x3 mm footprint (vs INA181A2IDCNR)
- Gain flexibility without PCB rework (vs INA2181A4IDGSR)
- Cost-optimized family positioning (vs INA2180A2IDGKR)
Design Notes
Kelvin-connect the sense inputs: route the IN+ and IN- traces directly to the shunt resistor pads, not to shared current-carrying copper. Even 1 mohm of trace resistance with a 5 A load adds 5 mV of error, which the 50 V/V gain amplifies to 250 mV of output error - a large fraction of the usable output range. Keep the two sense traces as a short, closely spaced pair to reject noise, and place the INA2181 within a few millimeters of the shunt.
Do not leave the REF pin at a high-impedance source. The REF pin sets the zero-current output level and its input resistance participates in the gain network; driving it through a large resistor or unbuffered divider shifts gain accuracy. For bidirectional measurement, buffer a mid-scale reference into REF; for unidirectional use, tie REF directly to ground. Also confirm your shunt full-scale drop: with 50 V/V gain, the maximum linear shunt drop is limited by output swing headroom on a 3.3 V or 5 V supply.
In PWM-driven motor or switcher environments, add a first-order RC filter on each amplifier output (for example 100 ohm and 1 nF, giving roughly 1.6 MHz corner) before the ADC input to attenuate switching noise while preserving the 350 kHz signal bandwidth. Avoid filtering the IN+/IN- inputs asymmetrically, because input filter mismatch converts common-mode noise into differential error. Estimated filter values should be validated against your PWM frequency and ADC sampling scheme.
Compliance Information
Standard TI commercial grade; the INA2181A2QDGSRQ1 variant is the AEC-Q100 qualified option. REACH/halogen status per TI product page not captured in retrieved data.
