Texas Instruments OPA726AIDGKT

Overview

OPA726AIDGKT from Texas Instruments is a single-channel, rail-to-rail output operational amplifier with shutdown capability, designed for high-precision, high-speed signal conditioning. It delivers 20MHz gain-bandwidth, 30V/µs slew rate, 6nV/√Hz input voltage noise at 100kHz, 0.0003% THD+N at 1kHz, and operates from 4V to 12V supply. It is used in transimpedance amplifiers for optical networking and as buffers for 16-bit ADCs like the ADS8342.

For engineers reviewing the OPA726AIDGKT datasheet, OPA726AIDGKT pinout, OPA726AIDGKT application, or OPA726AIDGKT equivalent, key selection criteria include its shutdown current (6µA/ch), rail-to-rail output swing (150mV from rails), low input bias current (<200pA), wide common-mode range (includes GND), and specified operation from −40°C to +125°C in MSOP-8 packaging.

Technical Context

The OPA726AIDGKT employs a proprietary 12V analog CMOS process with a patented output stage enabling 20MHz GBW and 30V/µs slew rate while maintaining excellent AC linearity. Its CMOS input architecture yields <200pA bias current and 6nV/√Hz noise at 100kHz, supporting precision photodiode I/V conversion.

It features an enable reference pin (DGND) referenced to V− or intermediate voltage, with defined logic thresholds (V_H > V_DGND + 2V, V_L < V_DGND + 0.8V) and fast enable/disable timing (t_ON = 30µs, t_OFF = 5µs). Input common-mode range extends from V− to (V+) − 2V, and rail-to-rail output achieves 150mV from rails into 100kΩ with AOL > 110dB.

Key Specifications

Pinout & Package

The OPA726AIDGKT is packaged in an 8-pin MSOP (DGK) with exposed thermal pad, optimized for space-constrained PCB layouts and thermal performance (θ_JA = 150°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA725AIDGKT, the OPA726AIDGKT adds shutdown control at no cost to AC performance; compared with OPA2726AIDGST, it provides half the channel count in a smaller footprint-ideal for single-ended, power-gated signal paths.

Availability

OPA726AIDGKT is available at Aetrix Electronics and suitable for optical networking transceivers, portable audio DAC outputs, and industrial process control signal chains requiring stable component supply across extended temperature ranges.

Supply support for OPA726AIDGKT 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 amps and signal chain solutions.

The OPA726AIDGKT belongs to TI's high-speed, low-noise CMOS op amp product line, engineered specifically for demanding applications including optical sensing, high-resolution data acquisition, and portable instrumentation.

FAQ

What is the maximum operating supply voltage for the OPA726AIDGKT?

The OPA726AIDGKT has an absolute maximum supply voltage of +13.2V, but its specified operating range is 4V to 12V for single-supply use or ±2V to ±6V for dual-supply configurations. Operation outside the 4V–12V range may cause parametric degradation or damage, and the device is not characterized beyond these limits per the SBOS278B datasheet.

Does the OPA726AIDGKT support rail-to-rail input?

No, the OPA726AIDGKT does not support rail-to-rail input. Its input common-mode voltage range extends from V− to (V+) − 2V, meaning it cannot accept signals within 2V of the positive rail. However, it does provide rail-to-rail output swing to within 150mV of both supply rails under light loads.

How is the Enable pin referenced on the OPA726AIDGKT?

The Enable pin on the OPA726AIDGKT is referenced to the DGND pin, not to V− or ground directly. DGND can be tied to V− in dual-supply systems or set to an intermediate voltage up to (V+) − 2V. The amplifier activates when Enable exceeds DGND + 2V and shuts down when Enable falls below DGND + 0.8V.

Can the OPA726AIDGKT drive capacitive loads, and what is the recommended compensation?

Yes, the OPA726AIDGKT can drive capacitive loads, with stability dependent on gain and overshoot tolerance. For unity-gain configurations with large capacitive loads, TI recommends inserting a 10Ω–20Ω resistor in series with the feedback path (inside the loop) to reduce ringing while preserving DC accuracy, as shown in Figure 3 of SBOS278B.

What is the typical input bias current of the OPA726AIDGKT over temperature?

The OPA726AIDGKT exhibits input bias current of 30pA typical and ≤200pA maximum at +25°C, with variation shown in the "Input Bias Current vs Common-Mode Voltage" curve. Over the full −40°C to +125°C range, bias current remains below 200pA, making it suitable for high-impedance photodiode and sensor interfaces across industrial temperatures.