The INA199 is a bidirectional, zero-drift current-shunt monitor with a voltage output, a common-mode range of −0.3 V to 26 V and a maximum offset of ±150 µV, so it can work with shunt drops as low as 10 mV full-scale. It is a more precise relative of the INA180. Figures are from the Texas Instruments INA199 datasheet SBOS469H.
Key specifications
| Common-mode | −0.3 to 26 V |
|---|---|
| Gains | 50, 100, 200 V/V |
| Offset | ±150 µV max |
| Gain error | ±1% (C), ±1.5% (A, B) max |
| Supply | 2.7–26 V |
| Current | 100 µA max |
| Packages | SC70-6, UQFN-10 |
What the datasheet promises
| Item | Datasheet value |
|---|---|
| Common-mode range | −0.3 V to 26 V, independent of the supply voltage |
| Gain options | INA199x1: 50 V/V; INA199x2: 100 V/V; INA199x3: 200 V/V |
| Offset voltage | ±150 µV maximum |
| Offset drift | 0.5 µV/°C maximum |
| Gain error over temperature | ±1 percent maximum (C version); ±1.5 percent maximum (A and B versions) |
| Gain drift | 10 ppm/°C maximum |
| Supply | 2.7 V to 26 V; 100 µA maximum supply current |
| Temperature | Specified −40 to 125 °C |
| Packages | SC70-6 and UQFN-10 |
Bidirectional means it can measure current flowing either way through the shunt, using the REF pin to set the output at zero current. The low offset lets you use a small shunt, which wastes less power.
Using it on a robot
- Sense battery or motor current on a 12 V or 24 V robot with a small shunt resistor.
- Choose the gain so the largest expected current, including stall, stays within the ADC range.
- Set the REF pin voltage for a bidirectional measurement, as the datasheet describes.
- For motor drives with fast PWM edges, see the INA240.
Sources and further reading
- Texas Instruments INA199 datasheet (SBOS469H) — common-mode range, gains, offset, drift, gain error, supply and packages above.
Last reviewed: November 2026. Limits are from the Texas Instruments datasheet; breakout boards and modules vary. No price is quoted because it has not been checked.
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