Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Gain | 50 V/V fixed (A2) |
| Direction | Bidirectional via REF-referenced output |
| Common Mode | −0.2 V to +26 V |
| Supply | 2.7 V to 5.5 V |
| Bandwidth | 210 kHz for A2 |
| Offset Voltage | ±150 µV max at VCM=0 V; ±500 µV max under stated 12 V condition |
| Gain Error | ±1% maximum |
| Exact Package / Packing | SOT-23 (DBV), 6 pins; 3000-piece large tape and reel |
Product Overview
INA181A2IDBVR is the 50 V/V bidirectional member of the INA181 family. The REF pin shifts the zero-current output level, allowing positive and negative shunt voltages to be represented inside a single-supply ADC range.
For A2, the fixed gain is 50 V/V and the specified bandwidth is about 210 kHz. The common family headline of 350 kHz applies to A1, so using the A1 bandwidth for this exact order code would overstate dynamic performance.
The SOT-23-6 package adds the REF pin needed for bidirectional operation. REF accuracy and source impedance therefore become part of the current-measurement error budget.
For related devices, see HKEQGOO’s Current Sense Amplifiers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | INA181A2IDBVR |
| Gain | 50 V/V fixed (A2) |
| Direction | Bidirectional via REF-referenced output |
| Common Mode | −0.2 V to +26 V |
| Supply | 2.7 V to 5.5 V |
| Bandwidth | 210 kHz for A2 |
| Offset Voltage | ±150 µV max at VCM=0 V; ±500 µV max under stated 12 V condition |
| Gain Error | ±1% maximum |
| Exact Package / Packing | SOT-23 (DBV), 6 pins; 3000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | 1AED |
Functional Highlights
REF defines the zero-current code
Driving REF at mid-supply allows charge and discharge current to move the output above and below the zero-current baseline. REF noise or error is transferred into the measurement.
50 V/V reduces required shunt drop at the cost of bandwidth versus A1
A2 produces more output voltage for a given VSENSE than A1, enabling a smaller shunt or better ADC code use, but its bandwidth is 210 kHz rather than 350 kHz.
Design Considerations
- Drive REF from a low-impedance, low-noise source appropriate for the ADC zero-current code.
- Check both positive and negative full-scale output swing around REF.
- Use Kelvin shunt routing and keep any differential input filter balanced.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists INA181A2IDBVR as Active / Production; SOT-23 (DBV), 6 pins; 3000-piece large tape and reel; Level-1-260C-UNLIM; −40°C to +125°C; marking 1AED.
Related Engineering Resources
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