Texas Instruments OPA2107AU

Overview

OPA2107AU from Texas Instruments is a precision dual Difet® operational amplifier in SO-8 package, delivering 8nV/√Hz input voltage noise at 10kHz, 1mV max input offset voltage, and 10µV/°C max drift-designed for high-impedance sensor amplification and DAC output buffering in medical CT scanners and precision data acquisition systems.

For engineers reviewing the OPA2107AU datasheet, OPA2107AU pinout, OPA2107AU application, or OPA2107AU equivalent, key selection criteria include ultra-low bias current (10pA max), unity-gain stability, 2µs settling to 0.01%, and SOIC-8 thermal resistance (175°C/W) for thermally constrained PCB layouts.

Technical Context

The OPA2107AU uses a proprietary dielectrically isolated (Difet®) process to achieve sub-10pA input bias current without compromising dc accuracy-laser-trimmed input circuitry ensures 1mV max VOS and 10µV/°C max drift across –25°C to +85°C. Its 13–18V/µs slew rate and 4.5MHz gain-bandwidth product support fast settling in closed-loop configurations with gains ≥1.

Designed for dual-channel precision analog signal conditioning, the OPA2107AU features fully independent amplifier sections with 120dB channel separation at 100Hz and >80dB PSRR/CMRR over 10Hz–10kHz-enabling simultaneous low-noise amplification of differential sensor outputs without crosstalk-induced error.

Key Specifications

Pinout & Package

OPA2107AU is housed in an 8-pin SOIC (SO-8) package with 1.27mm pitch, 3.9mm width, and 1.75mm max height-compatible with standard surface-mount reflow profiles (MSL Level-3, 260°C peak).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2107AU, OPA2111KP trades noise and package flexibility for legacy DIP compatibility, while AD822ARZ offers lower cost at the expense of 2.5× higher drift and slower settling-making OPA2107AU optimal for medical-grade dual-channel precision where noise, drift, and SO-8 integration are mandatory.

Availability

OPA2107AU is available at Aetrix Electronics and suitable for medical imaging equipment, high-resolution data acquisition systems, and precision DAC output stages requiring stable component supply across extended temperature ranges (–25°C to +85°C).

Supply support for OPA2107AU 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 over 90 years of innovation in precision signal chain solutions.

The OPA2107AU belongs to TI's Precision Difet® Op Amp family-engineered specifically for applications demanding ultra-low input bias current, sub-mV offset, and nanovolt-level noise in dual-channel configurations.

FAQ

What is the maximum operating temperature range for the OPA2107AU?

The OPA2107AU is specified for operation from –25°C to +85°C, with storage temperature rated from –40°C to +125°C. Its SO-8 package has a thermal resistance (θ_J-A) of 175°C/W, requiring careful attention to PCB copper area and airflow in high-ambient environments. The OPA2107AU maintains all key specifications-including 1mV max VOS and 10pA max IB-within this full industrial temperature range, making it suitable for deployed medical and industrial equipment.

Does the OPA2107AU require external compensation for unity-gain stability?

No, the OPA2107AU is internally compensated for unity-gain stability, eliminating the need for external capacitors or resistors in G=1 configurations. This is confirmed in both the device description ("unity-gain stable") and electrical characteristics table, where capacitive load stability is specified up to 1000pF at G=+1. Engineers can directly implement voltage followers or inverting buffers with the OPA2107AU without risk of oscillation, simplifying layout and reducing BOM count.

How does the OPA2107AU's input bias current compare to standard JFET-input op amps?

The OPA2107AU delivers ≤10pA max input bias current-approximately one order of magnitude lower than typical JFET-input op amps (e.g., TL072 at ~100pA). This is achieved via TI's proprietary Difet® dielectric isolation process, which suppresses leakage paths without degrading noise or offset. In practice, this allows the OPA2107AU to interface with >10GΩ source impedances (e.g., pH electrodes or piezoelectric sensors) where conventional JFET amps would introduce significant input error voltage.

Can the OPA2107AU drive heavy capacitive loads without instability?

Yes, the OPA2107AU is characterized for stable operation with up to 1000pF capacitive load at unity gain, as stated in the Electrical Characteristics table. This capability stems from its robust phase margin and internal compensation design. For loads exceeding 1000pF-or when driving long PCB traces-the OPA2107AU may require a small series resistor (e.g., 10–50Ω) between output and capacitance to isolate reactive loading, but no additional compensation network is needed for standard ADC input or cable-driving applications.

Is the OPA2107AU pin-compatible with other dual op amps in SO-8 packages?

The OPA2107AU follows the industry-standard SO-8 pinout for dual op amps (Pin 1 = Out A, Pin 2 = In– A, Pin 3 = In+ A, Pin 4 = –VS, Pin 5 = In+ B, Pin 6 = In– B, Pin 7 = Out B, Pin 8 = +VS), matching devices like LM358, TL072, and AD822. However, functional compatibility depends on specifications: while pinout matches, the OPA2107AU's 10pA IB and 8nV/√Hz noise are not replicated by those parts. Direct replacement is feasible only where its precision parameters are not required.