Texas Instruments OPA140ATDD2

Overview

OPA140ATDD2 from Texas Instruments is a high-precision, low-noise, rail-to-rail output JFET-input operational amplifier with 11-MHz gain bandwidth, ±0.1-mV max offset voltage, 0.5-µV/°C max drift, 0.1-pA typical input bias current, and 4.5-V to 36-V single-supply operation. It serves as a precision signal-conditioning front-end in battery-powered instrumentation and photodiode amplifiers.

For engineers reviewing the OPA140ATDD2 datasheet, OPA140ATDD2 pinout, OPA140ATDD2 application, or OPA140ATDD2 equivalent, key selection criteria include its JFET input stage enabling ultra-low bias current, rail-to-rail output swing for full dynamic range utilization with ADCs, low 1/f noise critical for DC-coupled sensors, and no phase reversal under overdrive conditions.

Technical Context

The OPA140ATDD2 implements a JFET-input differential pair with matched P-channel devices, delivering sub-picoampere input bias current and negligible input current drift over temperature. Its fully differential internal architecture supports stable operation with capacitive loads up to 100 pF without external compensation.

It features a unity-gain-stable design with 11-MHz gain-bandwidth product and 20-V/µs slew rate, optimized for precision DC-coupled applications requiring low distortion and minimal settling error. The input common-mode range extends to the negative rail (V−), enabling true single-supply sensor interfacing.

Key Specifications

Pinout & Package

Bare die in waffle pack, unpassivated silicon die with TiW/AlCu metallization (1100 nm), 15-mil thickness, floating backside, and seven bond pads defined per TI SBOS610B Table 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA140ATDD2, OPA141AIDBVR trades packaging convenience for higher drift and current, while ADA4625-1ARMZ prioritizes speed and voltage noise at the expense of JFET-level input bias current and supply efficiency-making OPA140ATDD2 optimal for ultra-high-impedance, battery-constrained DC precision roles.

Availability

OPA140ATDD2 is available at Aetrix Electronics and suitable for battery-powered instruments, photodiode amplifiers, medical instrumentation, industrial controls, and precision data acquisition systems requiring stable component supply across extended production lifecycles.

Supply support for OPA140ATDD2 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 and embedded processing chips for industrial, automotive, and personal electronics markets.

The OPA140A product line delivers high-precision JFET-input op-amps optimized for DC-critical applications including sensor signal conditioning, medical diagnostics, and portable test equipment where ultra-low bias current and near-zero drift are mandatory.

FAQ

What is the maximum operating temperature range for the OPA140ATDD2?

The OPA140ATDD2 is characterized for operation from 0°C to 0°C per TI's Package Option Addendum. This reflects its qualification as a bare-die product intended for integration into custom packages or hybrid assemblies where final thermal performance is determined by the end-system enclosure and heatsinking. Users must validate thermal derating based on actual die attach method, substrate material, and ambient airflow. The OPA140ATDD2 itself does not carry an extended temperature grade rating.

Does the OPA140ATDD2 require external compensation for unity-gain stability?

No, the OPA140ATDD2 is internally compensated for unity-gain stability and operates stably with closed-loop gains ≥1 without external components. Its 11-MHz gain-bandwidth product and 20-V/µs slew rate are specified under unity-gain conditions. However, capacitive loads exceeding 100 pF at the output may induce peaking and require a small series resistor (10–50 Ω) between the output pin and load to maintain phase margin.

How is the OPA140ATDD2 packaged and what handling precautions apply?

The OPA140ATDD2 is supplied as an unpassivated bare silicon die in a waffle pack, with TiW/AlCu metallization and a 15-mil thickness. Due to its ESD sensitivity, TI mandates handling with grounded wrist straps, ionized air workstations, and conductive foam storage. Bond pad cleaning with argon plasma or oxygen plasma is recommended prior to wire bonding to ensure adhesion integrity and prevent intermetallic voids.

Can the OPA140ATDD2 be used with dual supplies, and what are the limits?

Yes, the OPA140ATDD2 supports dual-supply operation from ±2.25 V to ±18 V. This allows symmetric rail configurations for bipolar signal processing in active filters or precision integrators. When using dual supplies, the input common-mode range extends 0.1 V beyond the negative rail and 1.5 V below the positive rail, and the output swings within 50 mV of each rail under 10-kΩ load. Ensure both supplies share a low-impedance ground reference to avoid PSRR degradation.

What is the significance of the "no phase reversal" feature in the OPA140ATDD2?

The "no phase reversal" feature means the OPA140ATDD2 maintains correct polarity at its output even when the input common-mode voltage exceeds the specified range-such as during power-up sequencing or transient overdrive. Unlike older JFET op-amps, it avoids output latch-up or inversion that could damage downstream circuitry or corrupt control loops. This behavior is guaranteed across the full supply range and makes the OPA140ATDD2 suitable for safety-critical inputs in automatic test equipment and industrial PLC analog modules.