Texas Instruments OPA211IDRGR

Overview

OPA211IDRGR from Texas Instruments is a dual-channel, precision operational amplifier optimized for low-noise, high-speed data acquisition and precision signal conditioning. It delivers 1.1 nV/√Hz input voltage noise at 1 kHz, 700 ns 16-bit settling time over 10-V output swing, and rail-to-rail output with ±2.25 V to ±18 V supply range - enabling high-fidelity analog front-ends in test equipment and instrumentation.

For engineers reviewing the OPA211IDRGR datasheet, OPA211IDRGR pinout, OPA211IDRGR application, or OPA211IDRGR equivalent, key selection criteria include ultra-low voltage noise performance, 45 MHz unity-gain bandwidth, shutdown functionality, thermal pad–enabled SON-8 package, and compatibility with 16-bit ADC/DAC interfaces requiring sub-μV offset and <0.35 μV/°C drift.

Technical Context

The OPA211IDRGR implements a fully differential, high-slew-rate (27 V/μs) architecture with unity-gain stability and internal compensation. Its low-noise bipolar input stage achieves 1.1 nV/√Hz noise density while maintaining 80 MHz gain-bandwidth at G = 100 and 45 MHz at G = 1 - supporting wideband loop filter and fast-settling buffer roles.

It integrates an active high shutdown pin (Pin 8), exposed thermal pad connected to V–, and NC pins (1 & 5) that must remain unconnected or tied within supply rails. The device operates across –40°C to +125°C and supports both single-supply (4.5 V to 36 V) and dual-supply configurations.

Key Specifications

Pinout & Package

OPA211IDRGR is housed in an 8-pin SON (Small Outline No-lead) package measuring 3.00 mm × 3.00 mm with an exposed thermal pad on the underside. The thermal pad must be soldered to PCB and connected to V– for specified thermal performance and electrical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision operational amplifier applications.

Compared with OPA211IDRGR, OPA211IDGKR trades thermal performance for pin-compatible VSSOP fit, while OPA211AIDRGR improves DC precision without sacrificing noise or speed - making the base OPA211IDRGR optimal for cost-sensitive, thermally constrained, high-bandwidth precision applications.

Availability

OPA211IDRGR is available at Aetrix Electronics and suitable for ultrasound scanner front-ends, semiconductor test instrumentation, and X-ray detector signal chains requiring stable component supply, long-term lifecycle support, and traceable sourcing for medical and industrial OEM programs.

Supply support for OPA211IDRGR 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, embedded processing, and connectivity technologies with decades of precision amplifier innovation.

The OPAx211 product line was engineered for ultra-low-noise, high-speed precision signal conditioning in demanding test, measurement, and medical imaging applications - prioritizing noise density, settling fidelity, and thermal robustness in compact packages.

FAQ

What is the maximum supply voltage rating for the OPA211IDRGR?

The OPA211IDRGR has an absolute maximum supply voltage (V_S = V₊ – V_–) of 40 V. Its recommended operating range is 4.5 V to 36 V for single supply or ±2.25 V to ±18 V for dual supply. Exceeding 40 V risks permanent damage per TI's Absolute Maximum Ratings table in SBOS377L Rev L.

Does the OPA211IDRGR support rail-to-rail input common-mode range?

No, the OPA211IDRGR 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 requires careful biasing in single-supply configurations - unlike its rail-to-rail output capability, which extends within 200 mV of either rail under light load.

How is the thermal pad on the OPA211IDRGR package electrically connected?

The exposed thermal pad on the OPA211IDRGR (SON-8) must be soldered to the PCB and electrically connected to the V_– pin. TI specifies this connection in the Pin Functions table and Thermal Information section (R_θJB = 28.8°C/W assumes thermal pad tied to V_–). Leaving it floating degrades thermal performance and may cause instability.

Can the OPA211IDRGR drive a 600-Ω load while maintaining 16-bit accuracy?

Yes - the OPA211IDRGR delivers rail-to-rail output swing into 600-Ω loads with guaranteed performance: output voltage range is (V_–) + 0.6 V to (V₊) – 0.6 V at AOL ≥110 dB, and it provides 30 mA output current. Its 700 ns 16-bit settling time is validated under 10-V step, CL = 100 pF, RL = 600 Ω conditions per Electrical Characteristics Table 6.6.

Is the shutdown function of the OPA211IDRGR compatible with logic-level control from a 3.3-V microcontroller?

Yes - the shutdown pin (Pin 8) is active high and accepts logic-level inputs. With V₊ = 15 V, the device enables when V_SHUTDOWN ≤ (V₊) – 3 V = 12 V and disables when ≥ (V₊) – 0.35 V = 14.65 V. A 3.3-V GPIO cannot directly disable it, but can enable it; for full control, level-shifting or open-drain pull-up to V₊ is required to reach disable threshold.