1 Features
• Enhanced PWM rejection optimized for systems
subject to switching common-mode voltages
– Supports switching frequencies up to 125 kHz
• Wide common-mode voltage:
– Operational voltage: −5 V to +110 V
– Survival voltage: −20 V to +120 V
• Bidirectional operation
• High small signal bandwidth: 1.1 MHz (at all gains)
• Slew rate: 8 V/μs
• Step response settling time to 1%: 1 μs
• Excellent CMRR
– 166 dB DC-CMRR
– 104 dB AC-CMRR at 100 kHz
– 89 dB AC-CMRR at 1 MHz
• Accuracy:
– Gain error (maximum)
• Version A: ±0.01%, ±1 ppm/°C drift
• Version B: ±0.1%, ±5 ppm/°C drift
– Offset voltage (maximum)
• Version A: ±10 μV, ±0.1 μV/°C drift
• Version B: ±150 μV, ±0.5 μV/°C drift
• Available gains:
– INA241A1, INA241B1 : 10 V/V
– INA241A2, INA241B2 : 20 V/V
– INA241A3, INA241B3 : 50 V/V
– INA241A4, INA241B4 : 100 V/V
– INA241A5, INA241B5 : 200 V/V
• Package options: SOT23-8, VSSOP-8

2 Applications
• Motor drives
• Solenoids and actuators
• Injection molding machine
• Cordless power tools
• Medical cordless tools
• Drone propeller speed control

3 Description
The INA241x is an ultra-precise, bidirectional current
sense amplifier than can measure voltage drops
across shunt resistors over a wide common-mode
range from –5 V to 110 V, independent of the supply
voltage. The high-precision current measurement
is achieved through a combination of low offset
voltage (±10 μV, maximum), small gain error
(±0.01%, maximum) and a high DC CMRR (typical
166 dB). The INA241x is designed for high voltage,
bidirectional measurements in switching systems
that see large common-mode voltage transients at
the device's inputs. The enhanced PWM rejection
circuitry inside the INA241x ensures minimal signal
disturbance at the output due to the common-mode
voltage transitions at the input.
The INA241x operates from a single 2.7 V to 20 V
supply, drawing 2.5 mA of supply current. The
INA241x is available in five gain options: 10 V/V,
20 V/V, 50 V/V, 100 V/V, and 200 V/V. Multiple
gain options allow for optimization between available
shunt resistor values and wide output dynamic range
requirements.
The INA241x is specified over operating temperature
range of −40°C to +125°C and is offered in a spacesaving
8-pin SOT-23 and 8-pin VSSOP package.