Texas Instruments OPA2725AIDG4

Overview

OPA2725AIDG4 from Texas Instruments is a dual, rail-to-rail output, 20MHz gain-bandwidth precision CMOS operational amplifier optimized for driving 16-bit ADCs such as the ADS8342. It delivers 30V/µs slew rate, 6nV/√Hz input voltage noise at 100kHz, 0.0003% THD+N at 1kHz, and operates from ±2V to ±6V or +4V to +12V supplies. Its key application is high-fidelity signal conditioning in optical networking transimpedance amplifiers and A/D converter buffers.

For engineers reviewing the OPA2725AIDG4 datasheet, OPA2725AIDG4 pinout, OPA2725AIDG4 application, or OPA2725AIDG4 equivalent, this page provides verified specifications, SOIC-8 package layout, real-world use cases in precision data acquisition and photodiode signal chains, and two confirmed alternative op amps with documented functional trade-offs.

Technical Context

The OPA2725AIDG4 uses a proprietary 12V analog CMOS process with a class AB output stage enabling rail-to-rail swing within 175mV of rails under 100kΩ load while maintaining >110dB open-loop gain. Its input stage features <200pA bias current and FET-like input impedance (10¹¹ Ω || 4pF), supporting transimpedance configurations with photodiodes up to 10MHz bandwidth.

It achieves fast 16-bit settling (450ns to 0.01%) via high GBW and low distortion, with excellent PSRR (≥100dB) and CMRR (≥94dB) maintained across −40°C to +125°C. The device is unity-gain stable and requires no external compensation for capacitive loads ≤20pF.

Key Specifications

Pinout & Package

OPA2725AIDG4 is packaged in an 8-pin SOIC (SO-8) surface-mount package with standard pinout for dual op amps. Thermal resistance θ_JA = 150°C/W enables operation at full rating up to +125°C ambient with minimal PCB copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2726AIDGST, OPA2725AIDG4 eliminates shutdown complexity and reduces BOM count; compared with OPA2132UA, it trades 1.2× higher input bias current for 2.5× greater bandwidth and 1.5× faster 16-bit settling-making it superior for time-critical data acquisition.

Availability

OPA2725AIDG4 is available at Aetrix Electronics and suitable for optical transimpedance amplifiers, 16-bit ADC buffering, active filter design, and portable audio line drivers requiring stable component supply across industrial temperature ranges.

Supply support for OPA2725AIDG4 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 op amp design and manufacturing.

The OPA725/OPA2725 product line was engineered for high-resolution data acquisition systems demanding simultaneous low noise, high speed, and rail-to-rail operation-targeting optical networking, test equipment, and industrial process control.

FAQ

What is the maximum capacitive load the OPA2725AIDG4 can drive stably in unity-gain configuration?

The OPA2725AIDG4 is specified for stable operation with up to 20pF capacitive load in unity-gain configuration without external compensation. For larger loads (e.g., >50pF), a 10Ω–20Ω series resistor inside the feedback loop is recommended to suppress ringing while preserving DC accuracy, as validated in TI's SBOS278B datasheet Figure 3.

Does the OPA2725AIDG4 support single-supply operation, and what is its minimum supply voltage?

Yes, the OPA2725AIDG4 supports true single-supply operation from +4V to +12V. Its specified operating range begins at +4V, and it functions down to +3.5V (absolute maximum rating), though parameters like GBW and slew rate degrade below +4V. Input common-mode range includes ground, and output swings to within 175mV of V−, enabling 0–5V signal handling.

How does the OPA2725AIDG4 achieve 16-bit settling performance despite its 20MHz GBW?

The OPA2725AIDG4 achieves 450ns 0.01% settling via a patented output stage that combines high slew rate (30V/µs) with low distortion (0.0003% THD+N) and exceptional open-loop gain (>110dB). This allows rapid correction of residual errors after the initial slewing phase, meeting 16-bit (1/65536 ≈ 0.0015%) accuracy within the ADS8342's 600ns acquisition window.

Is the OPA2725AIDG4 pin-compatible with other dual op amps in SOIC-8 packages like the OPA2333 or TL072?

No, the OPA2725AIDG4 is not pin-compatible with OPA2333 or TL072. Its SOIC-8 pinout follows the industry-standard dual op amp configuration (OUT A, −IN A, +IN A, V−, V+, +IN B, −IN B, OUT B), but OPA2333 uses a different pin mapping (e.g., V− on Pin 4, V+ on Pin 8), and TL072 places V− on Pin 4 and V+ on Pin 8 with inverted input ordering. PCB layout must match OPA2725AIDG4's specific pinout.

What thermal considerations apply to the OPA2725AIDG4 in SOIC-8 package at maximum load?

In SOIC-8 package, the OPA2725AIDG4 has θ_JA = 150°C/W. At 5.5mA per channel (11mA total) and 12V supply, power dissipation is ~132mW. With 25°C ambient, junction temperature rises by ~20°C - well within the +150°C absolute maximum. For continuous 40mA output into 100Ω loads, add 2in² of 2-oz copper pour under the package to maintain T_J < 125°C.