| Common mode voltage (Max) (V) | 110 |
| Common mode voltage (Min) (V) | -4 |
| Input offset (+/-) (Max) (uV) | 150 |
| Input offset drift (+/-) (Typ) (uV/C) | 0.07 |
| Gain (V/V) | 100, 20, 200, 50, 500 |
| Gain error (%) | 0.5 |
| Gain error drift (+/-) (Max) (ppm/°C) | 20 |
| CMRR (Min) (dB) | 120 |
| Bandwidth (kHz) | 1300 |
| Supply voltage (Max) (V) | 20 |
| Supply voltage (Min) (V) | 2.7 |
| Iq (Max) (mA) | 2.25 |
| Number of channels (#) | 1 |
| Comparators (#) | 0 |
| Features | High precision, Low-side Capable |
| Rating | Catalog |
| Operating temperature range (C) | -40 to 125 |
- Wide common-mode voltage:
- Operational voltage: ?4 V to +110 V
- Survival voltage: ?20 V to +120 V
- Excellent CMRR:
- 120-dB DC CMRR
- 65-dB AC CMRR at 50 kHz
- Accuracy:
- Gain:
- Gain error: ±0.5% (maximum)
- Gain drift: ±20 ppm/°C (maximum)
- Offset:
- Offset voltage: ±55 μV (typical)
- Offset drift: ±0.1 μV/°C (typical)
- Gain:
- Available gains:
- INA281A1, INA281B1 : 20 V/V
- INA281A2, INA281B2 : 50 V/V
- INA281A3, INA281B3 : 100 V/V
- INA281A4, INA281B4 : 200 V/V
- INA281A5, INA281B5 : 500 V/V
- High bandwidth: 1.3 MHz
- Slew rate: 2.5V/μs
- Quiescent current: 1.5 mA
The INA281 is a high-precision current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –4 V to 110 V. The negative common-mode voltage allows the device to operate below ground, thus accommodating precise measurement of recirculating currents in half-bridge applications. The combination of a low offset voltage, small gain error and high DC CMRR enables highly accurate current measurement. The INA281 is not only designed for DC current measurement, but also for high-speed applications (like fast overcurrent protection, for example) with a high bandwidth of 1.3 MHz and an 65-dB AC CMRR (at 50 kHz).
The INA281 operates from a single 2.7-V to 20-V supply, drawing 1.5 mA of supply current. The INA281 is available with five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. These gain options address wide dynamic range for current-sensing applications.
The INA281 is specified over an operating temperature range of ?40 °C to +125 °C and is offered in a space-saving SOT-23 package with two pin-out variants.
