Texas Instruments THS4031CDR

Overview

THS4031CDR from Texas Instruments is a single-channel, voltage-feedback operational amplifier optimized for low-noise, high-speed signal conditioning in precision analog front-ends. It delivers 100MHz bandwidth (G = 2, –3dB), 100V/μs slew rate, 1.2nV/√Hz input voltage noise, 200mA output drive, and features offset nulling pins (1 & 8) for fine-tuning. It is used in high-fidelity data acquisition systems to buffer 16-bit SAR ADCs like the ADS8422.

For engineers reviewing the THS4031CDR datasheet, THS4031CDR pinout, THS4031CDR application, or THS4031CDR equivalent, this page provides verified specifications, SOIC-8 and HVSSOP-8 package details, real-world application cards for video amplification and ultrasound scanning, and two validated alternative op-amps with documented functional and application differences.

Technical Context

The THS4031CDR employs a complementary bipolar 30V process with GHz f_T transistors, enabling unity-gain stability with 120MHz bandwidth and 70ns settling time (0.1%). Its voltage-feedback architecture supports both single-supply (9–32V) and split-supply (±4.5V to ±16V) operation while maintaining low distortion (–96dBc THD at 1MHz, R_L = 1kΩ).

It integrates dedicated offset nulling terminals (pins 1 and 8), enabling precise calibration of the typical 0.3mV input offset voltage. The device draws only 7.5mA per channel and achieves ±13.6V output swing into 1kΩ at ±15V supplies - critical for driving high-resolution ADCs without clipping.

Key Specifications

Pinout & Package

THS4031CDR is available in D (SOIC-8) package (4.9mm × 6mm) and DGN (HVSSOP-8) package (3.0mm × 4.9mm). Both variants share identical pin functions and electrical behavior.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA695IDBVR and LMH6629MA/NOPB, THS4031CDR uniquely combines offset nulling capability, SOIC-8/HVSSOP-8 packaging, and balanced 100MHz/100V/μs/1.2nV/√Hz performance - making it optimal for calibrated, medium-bandwidth precision analog systems rather than RF or ultra-low-noise niche applications.

Availability

THS4031CDR is available at Aetrix Electronics and suitable for video amplification, ultrasound scanning, and high-resolution data acquisition requiring stable component supply across industrial, medical, and test equipment programs.

Supply support for THS4031CDR 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 product line was designed specifically for low-noise, wide-bandwidth analog signal conditioning in communications infrastructure, medical imaging, and high-speed data conversion systems - prioritizing noise, speed, and DC accuracy in a single high-drive package.

FAQ

What is the maximum recommended supply voltage for THS4031CDR?

The absolute maximum supply voltage for THS4031CDR is ±16V (32V total) in dual-supply mode or 32V in single-supply mode. Operation beyond this risks permanent damage. For reliable long-term use, TI specifies ±15V (or 30V single) as the maximum recommended operating condition - delivering full 100MHz bandwidth and 200mA output drive without exceeding junction temperature limits.

Does THS4031CDR support single-supply operation?

Yes, THS4031CDR supports true single-supply operation from 9V to 32V. Its input common-mode range extends to within 1.5V of the negative rail and its output swings to within 1.4V of either rail under load. When used with single supply, proper biasing of the noninverting input (e.g., via resistive divider) is required to establish correct DC operating point - as demonstrated in TI's THS4031-based SAR ADC driver reference designs.

How do I use the NULL pins on THS4031CDR?

To use the NULL pins (1 and 8) on THS4031CDR, connect a 10kΩ potentiometer between pin 1 and pin 8, then tie the wiper to V_CC–. Adjusting the potentiometer changes the internal offset correction current, allowing reduction of input offset voltage from 0.3mV typical down to <100μV. This configuration is shown in Figure 6-4 of the THS4031CDR datasheet and is especially valuable in DC-coupled precision instrumentation where offset drift must be minimized.

Can THS4031CDR drive a 150Ω load at full bandwidth?

Yes, THS4031CDR is fully specified into 150Ω loads: it maintains 100MHz bandwidth (G = 2), 100V/μs slew rate, and –81dBc THD at 1MHz under those conditions. However, output voltage swing is reduced to ±12.9V (vs ±13.6V into 1kΩ), and thermal dissipation increases - requiring attention to PCB copper area and ambient temperature. TI's thermal data confirms safe operation with R_θJA = 124.5°C/W (SOIC-8) at typical loads.

Is THS4031CDR unity-gain stable?

Yes, THS4031CDR is unity-gain stable with a minimum small-signal bandwidth of 100MHz and a unity-gain bandwidth of 120MHz. This allows use as a broadband buffer (G = 1) without external compensation components. Stability is maintained across the full supply range (±4.5V to ±16V) and temperature range (–40°C to +85°C), as verified in TI's open-loop gain/phase plots (Figure 5-10) and application notes on high-speed op-amp layout.