Texas Instruments OPA376AID

Overview

OPA376AID from Texas Instruments is a precision rail-to-rail input/output operational amplifier featuring 7.5 nV/√Hz input voltage noise at 1 kHz, 5 μV typical offset voltage, 5.5 MHz gain-bandwidth product, and 760 μA typical quiescent current - optimized for high-accuracy signal conditioning in battery-powered precision instrumentation.

For engineers reviewing the OPA376AID datasheet, OPA376AID pinout, OPA376AID application, or OPA376AID equivalent, key selection criteria include low-noise performance in sub-10 μV offset systems, stable unity-gain operation with capacitive loads up to 250 pF, single-supply compatibility from 2.2 V to 5.5 V, and SOIC-8 packaging for industrial-grade thermal reliability.

Technical Context

The OPA376AID employs TI's e-trim™ technology to achieve 5 μV typical input offset voltage and 0.26–0.32 μV/°C drift over –40°C to +125°C, enabling high DC accuracy without external trimming. Its CMOS input stage delivers 0.2 pA typical input bias current and rail-to-rail common-mode range extending 100 mV beyond supply rails.

With 5.5 MHz GBW, 2 V/μs slew rate, and 0.8 μVPP 0.1 Hz–10 Hz noise, the device supports fast settling (2 μs to 0.01%) while maintaining low THD+N (0.00027% at 1 kHz) - making it suitable for driving SAR ADCs and precision active filters without signal degradation.

Key Specifications

Pinout & Package

OPA376AID is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with standard industry footprint and thermal performance (R_θJA = 100.1°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA376AID, OPA333AIDR trades bandwidth and power efficiency for near-zero drift, while ADA4522-1ARZ delivers lower broadband noise but sacrifices low-voltage operation - making OPA376AID the balanced choice for 2.2–5.5 V, 1–100 kHz precision signal chains requiring both AC fidelity and DC accuracy.

Availability

OPA376AID is available at Aetrix Electronics and suitable for ADC buffering, medical sensor interfaces, handheld test instrumentation, and battery-powered audio signal conditioning requiring stable component supply across industrial temperature ranges.

Supply support for OPA376AID 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 specializing in analog and embedded processing technologies, with leadership in precision op amps, data converters, and power management ICs.

The OPA376AID belongs to TI's e-trim™ precision op amp product line, engineered for high-accuracy, low-power signal conditioning in portable and industrial instrumentation where DC precision and AC fidelity must coexist.

FAQ

What is the maximum capacitive load the OPA376AID can drive stably in unity-gain configuration?

The OPA376AID can drive up to 250 pF of pure capacitive load stably in unity-gain configuration. For larger loads, adding a 10–20 Ω series resistor at the output improves phase margin without degrading DC accuracy. This capability makes OPA376AID well-suited for driving ADC inputs and active filter stages where parasitic capacitance is present. The OPA376AID datasheet confirms this limit under CL = 250 pF, G = +1 conditions.

Does the OPA376AID support true rail-to-rail input and output operation?

Yes, the OPA376AID supports rail-to-rail input with common-mode range from (V−) − 0.1 V to (V+) + 0.1 V, and rail-to-rail output with swing within 20 mV of both supply rails under 10 kΩ load. This allows full utilization of supply voltage headroom in single-supply systems such as 3.3 V data acquisition modules. The OPA376AID specification sheet explicitly states these values in the Electrical Characteristics table.

What is the typical quiescent current of the OPA376AID and how does it vary with supply voltage?

The OPA376AID draws 760 μA typical quiescent current at 5.5 V supply and 25°C, increasing to 950 μA maximum across temperature and voltage. At 2.2 V supply, IQ remains stable within ±10% - confirming consistent low-power behavior across its full 2.2–5.5 V operating range. This makes OPA376AID ideal for always-on sensor nodes where battery life is constrained. The OPA376AID datasheet plots IQ vs VS in Figure 9.

How does the e-trim™ technology in the OPA376AID improve long-term stability compared to standard precision op amps?

e-trim™ technology laser-trims internal resistors during final test to minimize initial offset voltage (5 μV typical) and reduce drift to 0.26 μV/°C over –40°C to +85°C. Unlike chopper-stabilized amplifiers, OPA376AID avoids switching artifacts and achieves superior 0.1–10 Hz noise (0.8 μVPP). This provides predictable, maintenance-free DC accuracy in field-deployed instrumentation. The OPA376AID product folder documents e-trim™ as TI's proprietary wafer-level trimming process.

Is the OPA376AID pin-compatible with other members of the OPA376 family, such as the SOT-23 or SC70 variants?

No, the OPA376AID (SOIC-8) is not pin-compatible with the 5-pin SOT-23 (OPA376DBVR) or SC70 (OPA376DCKR) variants due to differing pin counts and functions - the SOIC-8 includes two NC pins not present in 5-pin packages. However, electrical specifications and functional behavior are identical across all OPA376 variants. Designers must adapt PCB layout when substituting OPA376AID for smaller packages. The OPA376AID Pin Configuration section confirms NC placement on pins 1 and 5 in SOIC-8.