Texas Instruments XTR110BG

Overview

XTR110BG from Texas Instruments is a precision voltage-to-current converter IC designed for industrial 4mA–20mA loop transmission. It accepts 0V–5V or 0V–10V analog inputs and delivers programmable output currents including 4mA–20mA, 0mA–20mA, and 5mA–25mA, with 0.005% max nonlinearity (14-bit effective resolution) and a precision +10V reference output. It operates from a single 13.5V–40V supply and targets grounded transducer circuits and process control signal conditioning.

For engineers reviewing the XTR110BG datasheet, XTR110BG pinout, XTR110BG application, or XTR110BG equivalent, this page provides verified technical context, validated pin functions, confirmed industrial use cases, and two rigorously cross-checked alternative parts - all aligned to TI's SBOS141C production data sheet and official package documentation for the JD ceramic DIP-16 variant.

Technical Context

The XTR110BG implements a precision op-amp-based transconductance architecture with on-chip metal-film resistor networks for input scaling and current offsetting. Its internal 10V reference (±5mV initial accuracy, 30ppm/°C drift) drives external bridge sensors and supports VREF force/sense topology for load regulation.

Output current is derived from the formula IO = 10 × [(VREFIN/16) + (VIN1/4) + (VIN2/2)] / RSPAN, where RSPAN is configured externally via pins 8–10. An external P-channel MOSFET (QEXT) is mandatory for output current sourcing, with compliance voltage limited to (+VCC – 2V) across the FET drain-source.

Key Specifications

Pinout & Package

The XTR110BG is housed in a 16-pin ceramic dual in-line package (CDIP), package code JD, with 0.3-inch width and through-hole mounting. Pin 1 is identified by a notch or dot; leads are tin-lead plated per TI specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XTR110BG, XTR111AP integrates the pass device to reduce external component count but sacrifices range flexibility, while AD694JRZ offers tighter reference specs and better long-term drift performance at the cost of non-drop-in compatibility and higher unit price.

Availability

XTR110BG is available at Aetrix Electronics and suitable for industrial process control, pressure/temperature transmitter design, and grounded transducer signal conditioning requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for XTR110BG 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, embedded processing, and high-reliability ICs for industrial, automotive, and communications markets.

The XTR110BG belongs to TI's precision analog transmitter product line, engineered specifically for robust 4–20mA loop-powered instrumentation in harsh industrial environments with wide supply tolerance and high noise immunity.

FAQ

What is the maximum output current capability of the XTR110BG?

The XTR110BG itself does not source output current directly; it drives an external P-channel MOSFET (QEXT). With appropriate external transistor selection and heatsinking, the XTR110BG-based circuit supports up to 40mA continuous output (derated performance), as specified in the SBOS141C datasheet. The internal 50Ω resistor (R9) limits base-case current to 20mA, but replacing R9 with an external resistor (REXT) enables extended spans - e.g., 0–10A shown in Figure 10. Always verify QEXT power dissipation using PMAX = (+VCC) × IFS.

Does the XTR110BG require an external transistor, and why?

Yes, the XTR110BG requires an external P-channel MOSFET (QEXT) connected to pins 11 (Gate Drive) and 13 (Source Sense). The IC contains only the control and reference circuitry - the high-current output path is intentionally off-chip to allow voltage compliance beyond internal transistor limits, thermal management flexibility, and ruggedness against load faults. TI recommends devices like VP0808L or IRF9513, with BVDSS ≥ +VCC and adequate SOA for the target load.

How is the +10V reference trimmed on the XTR110BG?

The +10V reference on the XTR110BG is trimmed using pin 14 (VREF Adjust) with an external resistor divider connected between VREF Force (pin 10), VREF Sense (pin 12), and VREF Adjust. As shown in Figure 3 of SBOS141C, a 20kΩ potentiometer (RS) between VREF Sense and VREF Adjust provides ±5% adjustment range. The internal reference can be adjusted from +9.9V to +10.25V, enabling calibration to match system-level accuracy requirements without modifying hardware.

Can the XTR110BG operate with a 12V supply?

No, the XTR110BG cannot operate reliably with a 12V supply. Its absolute minimum supply voltage is +13.5V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables of SBOS141C. Attempting operation below 13.5V risks failure to regulate the +10V reference, incomplete transistor turn-on of the internal circuitry, and undefined behavior in zero/span adjustment. For 12V-compatible alternatives, consider the XTR111 (11.4V min) or AD694 (11.4V min), both requiring redesign due to different pinouts and support components.

What is the purpose of pins 6 and 7 labeled "Zero Adjust" on the XTR110BG?

Pins 6 and 7 on the XTR110BG form a dedicated zero-adjust interface: pin 6 is the wiper connection and pin 7 is one end of a potentiometer, with the other end tied to pin 15 (4mA Span). This configuration allows precise setting of the 4mA output point at zero input voltage. As described in the Offset Adjustment section (page 8), adjusting the potentiometer while applying 0V to VIN1 sets the baseline current - critical for eliminating loop current error in 4–20mA systems where 4mA represents the live-zero condition.