Texas Instruments OPA211ID

Overview

OPA211ID from Texas Instruments is a precision, low-noise, rail-to-rail output operational amplifier in SOIC-8 package, delivering 1.1 nV/√Hz input voltage noise density at 1 kHz, 27 V/μs slew rate, and 700 ns 16-bit settling time across ±15 V supplies. It serves as a high-fidelity loop filter amplifier in PLL systems and drives 16-bit ADCs in precision data acquisition.

For engineers reviewing the OPA211ID datasheet, OPA211ID pinout, OPA211ID application, or OPA211ID equivalent, key selection criteria include ultra-low 1.1-nV/√Hz noise, ±2.25 to ±18 V dual-supply operation, shutdown functionality, rail-to-rail output swing, and compatibility with high-resolution analog signal chains requiring <0.0015% settling accuracy.

Technical Context

The OPA211ID implements a fully differential, high-gain bipolar input stage optimized for voltage noise minimization and wide bandwidth, supporting unity-gain stability with 45 MHz GBW at G = 1 and 80 MHz at G = 100. Its internal shutdown logic enables active-high control with sub-3 μs turn-off time and <20 μA quiescent current in disabled state.

Designed for precision DC-coupled and wideband AC applications, it maintains 114 dB open-loop gain over –40°C to +125°C, supports rail-to-rail output swing into 10 kΩ loads, and achieves 0.000015% THD+N at 1 kHz with 3 VRMS output - critical for metrology-grade instrumentation and high-fidelity sensor conditioning.

Key Specifications

Pinout & Package

OPA211ID is packaged in an 8-pin SOIC (4.90 mm × 3.90 mm) with standard pinout and exposed thermal pad on V–-connected die underside in SON/VSSOP variants - SOIC variant uses conventional leadframe without thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA211ID, OPA211AID offers identical electrical performance and footprint, while ADA4898-1ARMZ trades shutdown functionality for marginally lower drift - making OPA211ID optimal for space-constrained, low-power, high-SNR applications requiring integrated control.

Availability

OPA211ID is available at Aetrix Electronics and suitable for ultrasound scanner front-ends, semiconductor test equipment, and lab instrumentation DAQ systems requiring stable component supply, long-lifecycle assurance, and traceable sourcing.

Supply support for OPA211ID 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 company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and communications markets.

The OPA211ID belongs to TI's precision op-amp product line, engineered specifically for high-fidelity signal conditioning in metrology, medical imaging, and test equipment where ultra-low noise, fast settling, and DC accuracy are non-negotiable.

FAQ

What is the maximum supply voltage rating for the OPA211ID?

The OPA211ID has an absolute maximum supply voltage (V_S = V+ − V−) of 40 V, with recommended operating range from ±2.25 V to ±18 V (or 4.5 V to 36 V single supply). Exceeding ±18 V risks permanent damage and violates TI's specified operating conditions per SBOS377L Rev L datasheet Section 6.1 and 6.3.

Does the OPA211ID support rail-to-rail input common-mode range?

No, the OPA211ID does not support rail-to-rail input. Its common-mode voltage range is (V−) + 1.8 V to (V+) − 1.4 V for supplies ≥±5 V. This limitation is documented in Section 6.6 of the SBOS377L datasheet and requires external level-shifting or biasing for signals near supply rails.

What is the typical quiescent current per channel for the OPA211ID?

The typical quiescent current per channel for the OPA211ID is 3.6 mA at 25°C and ±15 V supply, rising to 6 mA maximum over the full –40°C to +125°C temperature range. This value is specified in Section 6.6 (Electrical Characteristics: Standard Grade) of the SBOS377L datasheet under POWER SUPPLY / I_Q.

Can the OPA211ID drive capacitive loads without instability?

Yes, the OPA211ID is unity-gain stable and can safely drive ≥100 pF capacitive loads, as verified by small-signal step response testing in Figure 24–27 of the SBOS377L datasheet. For loads >100 pF, external isolation resistance (e.g., 10–100 Ω in series with output) is recommended to maintain phase margin.

Is the shutdown pin of the OPA211ID compatible with 3.3-V logic levels?

Yes - the OPA211ID shutdown pin activates at V_SHUTDOWN ≥ (V+) − 0.35 V and deactivates below (V+) − 3 V. With V+ = 5 V, this corresponds to activation at ≥4.65 V, so direct 3.3-V logic will not assert shutdown. A level shifter or pull-up to V+ is required for reliable 3.3-V control, per Pin Functions table in Section 5 of SBOS377L.