INA117SM

The Texas Instruments INA117SM is a precision unity-gain difference amplifier featuring a very high common-mode input voltage range. This monolithic IC integrates a precision operational amplifier with a thin-film resistor network, enabling accurate measurement of small differential voltages even with common-mode signals up to ±200V. The inputs are protected against momentary overloads up to ±500V. In applications where galvanic isolation is not critical, the INA117SM can serve as a cost-effective alternative to isolation amplifiers, eliminating the need for isolated power supplies.

Key electrical specifications include a supply voltage range of 10V to 36V, a minimum CMRR of 90dB, and a maximum input offset voltage of 0.001V. The device operates with a quiescent current of 0.8mA and a slew rate of 5V/µs. It offers a unity voltage gain with a maximum gain error of 0.05% and a nonlinearity of 0.001%. The small-signal bandwidth is typically 500kHz. The operating temperature range is -40°C to 85°C.

The INA117SM is available in multiple package options including TO-CAN, SOIC, and PDIP. It is suitable for applications requiring precise differential voltage measurement in environments with significant common-mode noise or voltage.