Precision voltage-to-current converter for 4-20 mA loops
The XTR111AIDRCT is a precision voltage-to-current converter from Texas Instruments, designed to translate an analog voltage input into a proportional output current — the standard 4-20 mA loop signal used across industrial process control, PLC analog output modules, and sensor transmitter boards. The exposed pad aids thermal dissipation when driving the loop into low-impedance loads.
Key ratings and what they mean for the BOM
Supply current is 550 µA — the device's own quiescent draw is low enough that in a loop-powered 4-20 mA transmitter, nearly all the available loop current goes to the sensor and the output signal, not to the converter itself. Operating temperature spans -55°C to 125°C, covering the full industrial and military temperature range. A transmitter deployed in an outdoor pipeline monitoring station or an engine-bay pressure sensor sees the same rated performance across the band. Input type is voltage; the output is a current proportional to that voltage — the classic transfer function for driving a 4-20 mA loop. The output current range (typically 0-20 mA or 4-20 mA) is set by external resistors per the datasheet application circuit.
It is ROHS3 compliant, so it meets the current EU restriction on hazardous substances without requiring an exemption.