Texas Instruments THS4531IRUNR

Overview

THS4531IRUNR from Texas Instruments is an ultra-low-power, fully-differential amplifier with rail-to-rail output and negative-rail input capability, operating from 2.5 V to 5.5 V supply, consuming only 250 µA quiescent current (typical), and delivering 36 MHz bandwidth and 200 V/µs slew rate. It serves as a precision ADC driver in low-power data acquisition systems, especially for SAR and ΔΣ converters requiring dc-coupled differential signaling.

For engineers reviewing the THS4531IRUNR datasheet, THS4531IRUNR pinout, THS4531IRUNR application, or THS4531IRUNR equivalent, key selection criteria include its 10 nV/√Hz input voltage noise at 1 kHz, ±4 µV/°C VOS drift over –40°C to +125°C, output common-mode control accuracy (±1 mV offset), power-down mode (0.5 µA), and WQFN-10 package compatibility with high-density PCB layouts.

Technical Context

The THS4531IRUNR implements a fully-differential architecture with independent VOCM input enabling precise output common-mode setting-critical for dc-coupled interfacing to ADCs. Its negative-rail input (down to VS– – 0.2 V) and rail-to-rail output (within 100–120 mV of rails) allow single-supply operation with ground-referenced signal sources.

It features integrated power-down functionality (logic-controlled PD pin), 114 dB open-loop gain, and 90–116 dB CMRR, supporting high-accuracy signal conditioning in wide-bandwidth, low-distortion applications up to 1 MHz (–122 dBc 2nd-harmonic distortion at 1 kHz, 1 VRMS).

Key Specifications

Pinout & Package

THS4531IRUNR is packaged in a 2.00 mm × 2.00 mm, 10-pin WQFN (RUN) with wettable flanks, optimized for automated optical inspection and thermal performance in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fully-differential amplifier applications.

Compared with THS4531IRUNR, THS4521IDGKR delivers 4× higher bandwidth at 4.5× higher power, while THS4561IRUNR improves THD by 6 dB at 2.3× higher current-making THS4531IRUNR the optimal balance for power-constrained, wideband precision signal chains.

Availability

THS4531IRUNR is available at Aetrix Electronics and suitable for low-power data acquisition, battery-operated sensor interfaces, and high-channel-count industrial I/O modules requiring stable component supply and long-term production continuity.

Supply support for THS4531IRUNR 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 precision amplifiers and data converter interface solutions.

The THS4531IRUNR belongs to TI's ultra-low-power fully-differential amplifier product line, designed specifically for energy-efficient, high-accuracy signal conditioning in space- and power-constrained systems such as portable instrumentation and distributed sensor networks.

FAQ

What is the maximum recommended supply voltage for THS4531IRUNR?

The absolute maximum supply voltage for THS4531IRUNR is 5.5 V across VS+ and VS–. Operation above this risks permanent damage. The device is fully specified from 2.5 V to 5.5 V, with optimal AC performance (e.g., 36 MHz bandwidth, –122 dBc THD) achieved at 5 V supply. Derating is not required below 5.5 V, and no internal protection circuitry limits operation within this range.

Does THS4531IRUNR require external compensation components?

No, THS4531IRUNR is unity-gain stable and does not require external compensation. Its fully-differential architecture and internal frequency compensation ensure stability with standard gain-setting resistor networks (e.g., RF = 2 kΩ) and loads up to 2 kΩ differential. Layout best practices-such as symmetric trace routing and local 0.1 µF bypass capacitors at VS+ and VS–-are sufficient for robust operation.

Can THS4531IRUNR drive a 600 Ω differential load?

Yes, THS4531IRUNR is characterized to drive 600 Ω differential loads with full performance: at VS = 5 V, it delivers 1 VRMS output (2.83 VPP) with –122 dBc 2nd-harmonic distortion and maintains rail-to-rail swing (VOUT+ and VOUT– each swing within 100–120 mV of rails). Output balance error remains ≤–67 dB up to 1 MHz under this condition.

How does the VOCM pin affect THS4531IRUNR's output common-mode voltage?

The VOCM pin directly programs the output common-mode voltage with 0.99–1.01 V/V gain and ±1 mV offset accuracy. When VOCM = 2.5 V, the average of VOUT+ and VOUT– equals 2.5 V ±1 mV-enabling precise alignment to ADC input common-mode requirements. The VOCM input accepts 0.75 V to 4.0 V and exhibits 65 kΩ || 0.86 pF impedance, requiring low-source-impedance drive for optimal settling.

Is THS4531IRUNR pin-compatible with other devices in the THS45xx family?

No, THS4531IRUNR in the WQFN-10 (RUN) package is not pin-compatible with SOIC-8 or VSSOP-8 variants of the THS45xx family. Its 10-pin layout (including two NC pins and relocated VS–/VIN–/VOCM) differs fundamentally from the 8-pin D/DGK packages. Migration requires PCB redesign; however, functional equivalents like THS4561IRUNR share identical RUN pinout and can be drop-in replacements.