OPA875IDGKR

Updated: 2026-09-12

Overview

The OPA875IDGKR is a high-speed, low-noise operational amplifier manufactured by Texas Instruments. It belongs to the company's precision op-amp portfolio, offering exceptional performance for demanding analog signal processing applications. The device comes in a compact MSOP-8 package, making it suitable for space-constrained designs. With a gain bandwidth product of 200MHz and a slew rate of 1000V/μs, the OPA875IDGKR excels in applications requiring fast signal processing. Its low input voltage noise of 1.9nV/√Hz makes it particularly valuable in sensitive measurement systems where signal integrity is paramount.

Structure and Working Principle

The OPA875IDGKR follows the standard operational amplifier architecture but with optimized transistor-level design for high-speed performance. It features a fully differential input stage followed by gain stages and output buffers. The device operates on a single supply voltage ranging from 4.5V to 12.6V or dual supplies of ±2.25V to ±6.3V. Internal compensation networks ensure stability across various gain configurations while maintaining high bandwidth. The output stage is designed to drive typical loads with minimal distortion, making it suitable for driving ADCs or transmission lines in data acquisition systems.

Key Features

The OPA875IDGKR stands out with its combination of high speed and precision. The device offers 200MHz bandwidth with only 1.9nV/√Hz input voltage noise, a rare combination in high-speed amplifiers. Its 1000V/μs slew rate enables faithful reproduction of fast signals without distortion. Additional features include rail-to-rail output swing, low input bias current (2pA typical), and excellent DC precision (0.5mV input offset voltage). The amplifier consumes 6.5mA quiescent current per channel, making it relatively power-efficient for its performance class.

Application Areas

The OPA875IDGKR finds extensive use in professional and industrial electronics. Medical imaging equipment benefits from its low-noise characteristics when amplifying weak sensor signals. Test and measurement instruments utilize its bandwidth for accurate signal acquisition. In communications infrastructure, the amplifier serves in baseband signal processing and intermediate frequency stages. Industrial automation systems employ it for sensor signal conditioning where both speed and precision are required. The device is also popular in scientific instrumentation for particle detection and spectroscopy applications.

Maintenance and Precautions

As with most precision analog components, proper handling is crucial for the OPA875IDGKR. The device is ESD-sensitive and should be handled with appropriate anti-static precautions. During PCB layout, attention must be paid to grounding schemes and signal routing to maintain signal integrity. Thermal considerations are important in high-density designs, as excessive heat can affect performance parameters. The amplifier's stability should be verified with the actual PCB parasitics and load conditions. Power supply bypassing with proper capacitors (typically 0.1μF ceramic close to the supply pins) is essential for optimal performance.

B2B Procurement Guide

When procuring the OPA875IDGKR in volume, buyers should verify the manufacturer's lead times and consider alternative part numbers for supply chain resilience. Texas Instruments offers evaluation modules that can help validate the amplifier in the target application before large-scale procurement. Buyers should specify the exact tape and reel packaging requirements for automated assembly. Minimum order quantities typically apply for direct purchases, while distributors may offer smaller quantities. For long-term projects, consider securing inventory buffers due to potential semiconductor industry fluctuations.