Current Loop Transmitter Interface IC Texas Instruments XTR115UA SOIC-8

The Texas Instruments XTR115UA is a linear integrated circuit in an SOIC-8 package designed for 4–20 mA current loop transmitter and interface applications. It offers precision current sourcing and regulation for loop-powered sensors and transmitters, enabling accurate signal conversion and stable long-distance analogue signal transmission in industrial automation and process control environments.

Advantages

The device integrates a precision voltage reference and current regulator to provide a stable, temperature-compensated output current for transmitter loops. Its SOIC-8 form factor simplifies PCB layout and assembly in compact designs. The XTR115UA supports a wide input voltage range and delivers low drift and good linearity across the 4–20 mA span, which helps maintain signal integrity over long cable runs and varying supply conditions.

Suitable for

• Loop-powered 4–20 mA transmitters and sensors
• Industrial process control and monitoring systems
• Long-distance analogue signal transmission over current loops
• Signal conditioning and conversion for transducers and transmitters

Key specifications

• Package: SOIC-8
• Function: 4–20 mA current loop transmitter interface
• Integrated precision voltage reference
• Precision current regulator with low drift
• Wide operating input voltage range suitable for loop-powered designs
• Designed for single-supply operation

How to use

Integrate the XTR115UA into the transmitter circuit following the manufacturer’s recommended schematic for loop-powered 4–20 mA applications. Connect the device to the sensor or transducer output and configure the external resistors as required to set the desired output current range. Ensure proper decoupling and grounding on the PCB and observe the specified input voltage range and power dissipation limits. Follow standard ESD precautions when handling the SOIC-8 package.

Recommendations

For reliable operation, use low-tolerance external resistors to set output currents, add a bypass capacitor near the supply pin to reduce noise, and route high-current loop traces away from sensitive analog inputs. Verify temperature performance in the intended operating range and consult the device datasheet for detailed thermal and layout guidelines.