Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Loop Function | 2-wire 4–20 mA transmitter |
| Quiescent Current | 200 µA |
| Loop Supply | 7.5 V to 36 V |
| Reference | 2.5 V precision reference for sensor excitation/offset |
| External Supply | 5 V regulator available for external circuitry |
| Precision | 0.05% span error; 0.003% nonlinearity stated features |
| Compatibility | Field transmitter / HART-compatible loop architecture |
| Exact Package / Packing | SOIC (D), 8 pins; 2500-piece large tape and reel |
Product Overview
XTR115UA/2K5 is a low-power two-wire current-loop transmitter that converts a local sensor/input signal into the industry-standard 4–20 mA loop while drawing only about 200 µA for its own operation. The remaining loop-current budget can power the sensing circuitry through the on-chip 5 V regulator.
XTR115 includes a 2.5 V reference; the related XTR116 uses a 4.096 V reference. That reference difference is electrically meaningful when the sensor excitation or zero/span network is built around the on-chip reference voltage.
The /2K5 exact order code is the active 2500-piece large-reel SOIC-8 UA grade. Its loop architecture is intended for field transmitters where the same two wires carry both power and the 4–20 mA signal.
For related devices, see HKEQGOO’s ADCs/DACs – Special Purpose category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | XTR115UA/2K5 |
| Loop Function | 2-wire 4–20 mA transmitter |
| Quiescent Current | 200 µA |
| Loop Supply | 7.5 V to 36 V |
| Reference | 2.5 V precision reference for sensor excitation/offset |
| External Supply | 5 V regulator available for external circuitry |
| Precision | 0.05% span error; 0.003% nonlinearity stated features |
| Compatibility | Field transmitter / HART-compatible loop architecture |
| Exact Package / Packing | SOIC (D), 8 pins; 2500-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | XTR 115U A |
Functional Highlights
200 µA quiescent current preserves current budget for the sensor electronics
At the 4 mA low end, every milliamp consumed locally reduces headroom for the sensor, amplifier and communication circuitry. The 5 V regulator load must remain within the total loop-current architecture.
2.5 V reference is part of the XTR115 identity
A design using the reference for bridge/offset excitation should not switch to XTR116 without recalculating resistor ratios and sensor bias around its 4.096 V reference.
Design Considerations
- Budget all locally powered circuitry so minimum loop current can still reach the required 4 mA zero.
- Calculate minimum supply from receiver resistor, cable/protection drop and transmitter compliance.
- If HART is used, preserve loop impedance and coupling network requirements alongside the DC current-transfer design.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists XTR115UA/2K5 as Active / Production; SOIC (D), 8 pins; 2500-piece large tape and reel; Level-3-260C-168 HR; −40°C to +85°C; marking XTR 115U A.
Related Engineering Resources
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