Texas Instruments THS4031CDGNR

Overview

THS4031CDGNR from Texas Instruments is a single-channel, ultra-low-noise, high-speed voltage-feedback operational amplifier optimized for precision analog signal conditioning in demanding wideband applications. It delivers 100MHz small-signal bandwidth (G = 2, –3dB), 100V/μs slew rate, 1.2nV/√Hz input voltage noise, –96dBc THD at 1MHz (RL = 1kΩ), and ±13.6V output swing (±15V supply), enabling high-fidelity buffering of 16-bit SAR ADCs such as the ADS8422.

For engineers reviewing the THS4031CDGNR datasheet, THS4031CDGNR pinout, THS4031CDGNR application, or THS4031CDGNR equivalent, key selection criteria include low-noise drive capability for data acquisition front-ends, offset nulling support for DC-critical instrumentation, thermal performance in HVSSOP packaging, and stability with capacitive loads up to 10pF without external compensation.

Technical Context

The THS4031CDGNR employs a 30V complementary bipolar process with GHz f_T NPN/PNP transistors, enabling voltage-feedback architecture with unity-gain stability and 120MHz bandwidth. Its internal compensation maximizes speed but requires series isolation resistors (>20Ω) when driving >10pF capacitive loads to maintain phase margin and prevent ringing.

It operates from ±4.5V to ±16V dual supplies (or 9V–32V single supply), features dedicated offset-null pins (1 and 8), and draws only 7.5mA per channel. The device achieves 70ns settling time to 0.1% and supports rail-to-rail input common-mode range (±14.3V at ±15V supply), making it suitable for high-dynamic-range signal chains requiring both speed and DC accuracy.

Key Specifications

Pinout & Package

THS4031CDGNR uses the DGN package: 8-pin HVSSOP (3.0mm × 4.9mm) with exposed thermal pad. This thermally enhanced package achieves 60.7°C/W junction-to-ambient resistance-nearly half that of SOIC-and requires connection of the thermal pad to a large copper plane for optimal power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, low-noise op-amp applications.

Compared with OPA656U and LMH6629MA, THS4031CDGNR uniquely balances ultra-low noise, high output current, offset nulling, and thermally efficient HVSSOP packaging-making it the preferred choice for DC-accurate, wideband analog front-ends in portable medical and industrial DAQ systems.

Availability

THS4031CDGNR is available at Aetrix Electronics and suitable for ultrasound scanner front-ends, high-resolution data acquisition systems, and video line driver designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for THS4031CDGNR 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 expertise in high-performance op-amps and precision signal-chain solutions.

The THS403x family was designed specifically for low-noise, wideband analog signal conditioning in communications, imaging, and test equipment-emphasizing speed, distortion performance, and DC accuracy in a robust bipolar process.

FAQ

What is the maximum capacitive load the THS4031CDGNR can drive without oscillation?

The THS4031CDGNR is internally compensated for unity-gain stability but exhibits reduced phase margin with >10pF capacitive loads directly at the output. To maintain stability, TI recommends placing a minimum 20Ω series isolation resistor between the OUT pin and the load capacitance. For 75Ω transmission lines, a 75Ω resistor provides both isolation and impedance matching. THS4031CDGNR remains stable under these conditions with no additional compensation required.

Does the THS4031CDGNR support single-supply operation?

Yes, THS4031CDGNR supports single-supply operation from 9V to 32V. When used in single-supply mode, the input common-mode range extends from 0V to V_CC – 1.5V (e.g., 0V to 30.5V at 32V supply), and output swing reaches within ~1.4V of each rail. Designers must ensure proper input biasing (e.g., mid-rail reference) and verify headroom for the intended signal swing. THS4031CDGNR's rail-compatible inputs simplify implementation in single-supply data acquisition systems.

How does the offset nulling function work on the THS4031CDGNR?

The THS4031CDGNR provides two dedicated NULL pins (1 and 8) for external offset voltage adjustment. A 10kΩ potentiometer is connected between these pins, with its wiper tied to VCC–. Adjusting the potentiometer changes the current injected into the input stage, trimming the input offset voltage to sub-millivolt levels. This feature is unique to the THS4031 (not present in THS4032) and is essential for DC-critical applications like precision instrumentation amplifiers. THS4031CDGNR's typical offset of 0.3mV can be reduced to <0.1mV using this method.

What thermal performance advantages does the DGN (HVSSOP) package offer over SOIC for THS4031CDGNR?

The THS4031CDGNR's DGN package (HVSSOP-8) delivers significantly better thermal performance than the SOIC-8 variant: R_θJA is 60.7°C/W versus 124.5°C/W, and R_θJB is 33°C/W versus 72.2°C/W. This is achieved via an exposed thermal pad that must be soldered to a large PCB copper area. As a result, THS4031CDGNR can dissipate ~2× more power at the same junction temperature rise, enabling higher continuous output current or operation in compact, thermally constrained enclosures without forced air cooling.

Can THS4031CDGNR drive a 150Ω load while maintaining specified THD and bandwidth?

Yes, THS4031CDGNR is fully characterized into 150Ω loads. At ±15V supply, it delivers 100MHz bandwidth (G = 2), 100V/μs slew rate, and –81dBc THD at 1MHz. Its 200mA output current ensures ±12.9V swing into 150Ω, supporting standard video and ADC interface levels. The device maintains stability and specified distortion performance without external components-provided the 20Ω series isolation resistor is used if the load includes >10pF capacitance. THS4031CDGNR's RL = 150Ω electrical characteristics are explicitly validated in TI's SLOS224L datasheet.