Texas Instruments XTR111AIDGQTG4

Overview

XTR111AIDGQTG4 from Texas Instruments is a precision voltage-to-current converter IC designed for industrial 4mA–20mA and 0mA–20mA current-loop transmitter applications. It delivers up to 32mA output with 0.002% nonlinearity, 0.015% span error, and 1μV/°C input offset drift, operating from 7V to 44V single supply. Its external P-MOSFET interface enables high-compliance voltage operation down to 2V below VSP and below ground - critical for HVAC valve control and analog output modules.

For engineers reviewing the XTR111AIDGQTG4 datasheet, XTR111AIDGQTG4 pinout, XTR111AIDGQTG4 application, or XTR111AIDGQTG4 equivalent, key selection criteria include its adjustable 3V–15V subregulator output, active-low error flag (EF), output disable (OD) control, and HVSSOP-10 package compatibility with industrial PCB layouts requiring thermal pad grounding.

Technical Context

The XTR111AIDGQTG4 implements a precision transconductance architecture where output current IOUT = 10 × VIN / RSET, set by a single external resistor. Its cascoded output stage uses an external P-channel MOSFET driven by the VG pin to achieve >1 GΩ output resistance and wide compliance range - extending from (VSP – 2V) down to negative voltages relative to GND.

It integrates a programmable 3V–15V linear regulator (REGF/REGS) capable of sourcing 5mA, supporting sensor excitation and signal conditioning in 3-wire systems. The EF pin provides real-time open-wire or overvoltage fault detection, while OD enables controlled power-up sequencing and multiplexed channel enable/disable without affecting regulator operation.

Key Specifications

Pinout & Package

The XTR111AIDGQTG4 is packaged in a 10-pin HVSSOP (DGQ) with exposed thermal pad, measuring 3mm × 4.9mm. The thermal pad must be soldered to GND for thermal performance and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-to-current converter applications.

Compared with XTR111IRGTT, the XTR111AIDGQTG4 offers superior thermal performance via its exposed pad but requires careful PCB land pattern design; versus XTR116UA, it trades higher integration for full configurability - making it optimal for multi-standard, high-accuracy industrial transmitters.

Availability

XTR111AIDGQTG4 is available at Aetrix Electronics and suitable for HVAC valve control, analog output modules, flow transmitter interfaces, and PLC controller analog outputs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for XTR111AIDGQTG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of heritage in precision signal conditioning and industrial interface solutions.

The XTR111AIDGQTG4 belongs to TI's XTR series of precision current-loop transmitters, engineered specifically for high-accuracy, high-reliability industrial process control applications demanding low drift, wide supply range, and robust fault detection.

FAQ

What is the maximum output current capability of the XTR111AIDGQTG4?

The XTR111AIDGQTG4 delivers up to 32mA continuously, with guaranteed accuracy over 0.1mA–25mA. Its current limit is factory-trimmed to 41mA ±9mA, and it relies on an external P-MOSFET for safe operation beyond 25mA. The device itself does not include internal current limiting - external circuitry must protect against destructive currents during fault conditions like load reconnection after open-circuit events. Always use the recommended external current-limit circuits shown in Figure 6-5 of the XTR111AIDGQTG4 datasheet.

How does the XTR111AIDGQTG4 achieve output compliance below ground?

The XTR111AIDGQTG4 achieves sub-ground compliance by driving the source terminal (IS pin) of an external P-channel MOSFET, allowing the load to be referenced to a potential lower than GND. With proper FET selection and layout, the output can swing down to at least 2V below the negative rail - enabling direct interfacing with field devices grounded remotely or at negative potentials. This capability is enabled by the high-output-resistance cascode architecture and the VG pin's ability to drive the FET gate from near VSP down to (VSP – 16V), maintaining linear operation across the full compliance range.

Can the XTR111AIDGQTG4 operate with a 5V supply?

No - the XTR111AIDGQTG4 requires a minimum supply voltage of 7V per its Absolute Maximum Ratings and Recommended Operating Conditions. At 5V, the internal circuitry cannot bias correctly, the regulator fails to start, and the current mirror loses accuracy. The device is optimized for industrial 24V systems with up to 44V transients; for low-voltage applications, consider alternatives like the XTR300 or discrete op-amp-based solutions. Attempting operation below 7V may result in undefined behavior or permanent damage due to internal clamp activation.

What is the function of the OD (Output Disable) pin on the XTR111AIDGQTG4?

The OD pin is an active-high logic input that disables the VG gate driver and forces the external P-MOSFET into cutoff. When OD = high, a 3kΩ internal switch connects VSP to VG, discharging the FET gate and ensuring zero output current. This feature prevents output glitches during power-up, power-down, or multiplexed channel switching. The pin has a 4μA internal pullup, so XTR111AIDGQTG4 defaults to disabled at power-on unless OD is externally tied to GND - a critical safety feature for fail-safe system design.

Does the XTR111AIDGQTG4 require calibration to achieve its 0.015% span error specification?

No - the 0.015% span error is a guaranteed initial specification at 25°C with no calibration required. However, for highest accuracy across temperature and supply variations, a 2-point calibration (e.g., at 4mA and 20mA) reduces residual nonlinearity to <±0.002% across the full range, as shown in Figure 5-13 of the XTR111AIDGQTG4 datasheet. The device's low 1μV/°C offset drift and 5 ppm/°C gain drift mean that end-point calibration at room temperature typically suffices for most industrial applications operating from –40°C to +85°C.