Texas Instruments OPA725AIDR

Overview

OPA725AIDR from Texas Instruments is a precision, high-speed, rail-to-rail output CMOS operational amplifier optimized for 16-bit ADC buffering and transimpedance applications. It delivers 20MHz gain-bandwidth, 30V/µs slew rate, 6nV/√Hz input voltage noise at 100kHz, 0.0003% THD+N at 1kHz, and rail-to-rail output swing within 150mV of supply rails under light loads - enabling high-fidelity signal conditioning in optical networking and portable audio systems.

For engineers reviewing the OPA725AIDR datasheet, OPA725AIDR pinout, OPA725AIDR application, or OPA725AIDR equivalent, key selection considerations include its 4V–12V single-supply operation, −40°C to +125°C temperature range, low 5.5mA/ch quiescent current, and SOIC-8 package compatibility with high-density PCB layouts requiring stable DC precision and fast settling.

Technical Context

The OPA725AIDR employs a proprietary 12V analog CMOS process with a class AB output stage enabling rail-to-rail output swing and excellent linearity (AOL > 110dB). Its architecture achieves 20MHz GBW and 30V/µs slew rate while maintaining sub-200pA input bias current and 6nV/√Hz noise at 100kHz - critical for photodiode transimpedance amplifiers and fast 16-bit ADC drivers like the ADS8342.

Input common-mode range extends from V− to (V+) − 2V, with CMRR ≥ 88dB over full range and PSRR ≥ 30µV/V. The device is unity-gain stable, features no phase inversion beyond supply rails when input current is limited to 10mA, and supports dual-supply (±2V to ±6V) or single-supply (4V–12V) configurations without performance degradation.

Key Specifications

Pinout & Package

OPA725AIDR is housed in an SOIC-8 (D) package with standard 1.27mm pitch, RoHS-compliant NiPdAu lead finish, and MSL Level-2 moisture sensitivity rating. Pin 1 is marked by a beveled corner or dot; the device uses industry-standard op amp pinout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2725AIDR, the OPA725AIDR provides dedicated single-channel performance with simpler thermal management and independent channel control; versus OPA380AIDBVR, it offers broader supply flexibility and proven 16-bit ADC settling - making it optimal for mixed-signal industrial and telecom signal chains.

Availability

OPA725AIDR is available at Aetrix Electronics and suitable for optical networking transceivers, precision data acquisition systems, and portable audio equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA725AIDR 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 OPA725AIDR belongs to TI's OPA725/726 family of 12V CMOS op amps, engineered specifically for high-speed, low-noise, rail-to-rail output applications demanding 16-bit accuracy - including ADC drivers, transimpedance amplifiers, and active filters in communications and test equipment.

FAQ

What is the maximum supply voltage for OPA725AIDR?

The absolute maximum supply voltage for OPA725AIDR is +13.2V, but the recommended operating range is 4V to 12V for single-supply use or ±2V to ±6V for dual-supply operation. Exceeding 12V may degrade long-term reliability and is not characterized across temperature. The OPA725AIDR maintains full specification compliance - including 20MHz GBW and 30V/µs slew rate - across its entire 4V–12V operating range.

Does OPA725AIDR support rail-to-rail input?

No, OPA725AIDR does not support rail-to-rail input. Its input common-mode voltage range extends from V− to (V+) − 2V, meaning the inputs cannot swing within 2V of the positive rail. However, the device does provide true rail-to-rail output swing - within 150mV of both supply rails under light loads - and includes robust input overvoltage protection via internal ESD diodes that clamp to the rails ±300mV.

Can OPA725AIDR drive heavy capacitive loads?

OPA725AIDR can drive moderate capacitive loads (≤100pF) stably in unity-gain configuration, but larger loads require compensation. For >100pF, insert a 10Ω–20Ω series resistor inside the feedback loop to isolate the op amp from the load capacitance. This preserves DC accuracy while reducing ringing - as validated in TI's SBOS278B datasheet Figure 3. The OPA725AIDR's stability is gain-dependent: higher closed-loop gains improve capacitive load tolerance.

Is OPA725AIDR pin-compatible with OPA726AIDR?

No, OPA725AIDR is not pin-compatible with OPA726AIDR. While both are offered in SOIC-8 packages, OPA726AIDR includes Enable and DGND pins (pins 1 and 5) for shutdown control, whereas OPA725AIDR has NC (no connect) on those positions. Substituting OPA725AIDR into an OPA726AIDR layout would leave Enable unconnected (causing unintended activation) and DGND floating - risking undefined behavior. Always verify pin mapping before replacement.

What is the typical quiescent current of OPA725AIDR at 25°C?

The typical quiescent current of OPA725AIDR at TA = +25°C is 4.3mA per amplifier, with a maximum of 5.5mA across the full −40°C to +125°C temperature range. This value is measured with zero output load and supply voltages of ±6V or +12V. Quiescent current increases slightly with supply voltage - rising to ~4.8mA at +12V - but remains well below 6mA, supporting power-sensitive applications such as portable instrumentation and battery-backed sensors.