Texas Instruments OPA2141AID

Overview

OPA2141AID from Texas Instruments is a dual-channel, rail-to-rail output, low-noise JFET-input operational amplifier designed for precision signal conditioning in high-impedance, wide-supply applications. It delivers 10MHz bandwidth, 6.5nV/√Hz input voltage noise density at 1kHz, ±2.25V to ±18V dual-supply operation, and operates across –40°C to +125°C. It is used in photodiode amplifiers and battery-powered instrumentation where low bias current (<20pA) and minimal 1/f noise (250nVPP, 0.1–10Hz) are critical.

For engineers reviewing the OPA2141AID datasheet, OPA2141AID pinout, OPA2141AID application, or OPA2141AID equivalent, key selection criteria include its JFET input stage enabling sub-20pA bias current, rail-to-rail output swing within 350mV of rails (at 2kΩ), no phase reversal behavior under overdrive, and guaranteed performance over automotive and industrial temperature ranges without derating.

Technical Context

The OPA2141AID implements a fully differential JFET input stage with matched P-channel devices, enabling ultra-low input bias current and excellent CMRR (126dB typ). Its unity-gain-stable architecture uses internal compensation optimized for 10MHz GBW while maintaining 20V/ms slew rate and <880ns 12-bit settling time.

It features input voltage range extending to V– (with –0.1V overdrive tolerance), rail-to-rail output capable of sourcing +36mA/sinking –30mA, and integrated thermal shutdown that activates at ~180°C junction temperature with 15°C hysteresis - critical for reliability in unattended industrial systems.

Key Specifications

Pinout & Package

OPA2141AID is available in SO-8 (D) and MSOP-8 (DGK) packages. Both variants share identical pinout and electrical specifications. The SO-8 package offers standard through-hole and surface-mount compatibility; MSOP-8 provides space-constrained PCB layouts with 3.0mm × 3.0mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2140AID and OPA227UA, the OPA2141AID uniquely balances ultra-low input bias current (20pA), low 1/f noise (250nVPP), and 10MHz bandwidth - making it the only dual-channel option qualified for both high-impedance sensor interfaces and moderate-speed precision data acquisition.

Availability

OPA2141AID is available at Aetrix Electronics and suitable for photodiode amplifiers, battery-powered instrumentation, and industrial process control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA2141AID 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 decades of heritage in precision op amp design and manufacturing.

The OPAx141 family was engineered specifically for high-impedance, low-noise, wide-supply applications - targeting medical sensors, analytical instrumentation, and industrial control systems demanding guaranteed performance from –40°C to +125°C.

FAQ

What is the maximum capacitive load the OPA2141AID can drive without instability?

The OPA2141AID remains stable with ≤100pF capacitive load when configured as a unity-gain buffer. For larger loads (e.g., ADC input capacitance + PCB trace), a series isolation resistor (ROUT = 24Ω to 51Ω) must be placed between the OPA2141AID output and the load - as validated in Figure 19 and Figure 20 of the SBOS510B datasheet. This preserves phase margin above 45° and prevents overshoot exceeding 15%.

Does the OPA2141AID support true single-supply operation down to 4.5V?

Yes, the OPA2141AID is fully specified for single-supply operation from +4.5V to +36V. At +4.5V, the input common-mode range extends from V– (0V) to (V+)–3.5V (1.0V), and the output swings from (V–)+0.35V (0.35V) to (V+)–0.35V (4.15V) into 2kΩ - enabling direct interfacing with 3.3V or 5V ADCs without level-shifting circuitry.

How does the OPA2141AID prevent phase reversal during input overvoltage?

The OPA2141AID incorporates internal input stage clamping that forces the output to saturate at the appropriate rail (V+ or V–) when the input exceeds the linear common-mode range - rather than reversing polarity. This behavior is confirmed in Figure 21 ("No Phase Reversal") of the SBOS510B datasheet and eliminates risk of erroneous control signals in overvoltage fault conditions.

What is the thermal shutdown threshold for the OPA2141AID in SO-8 package?

The OPA2141AID integrates thermal shutdown that disables the amplifier when junction temperature reaches approximately +180°C. For the SO-8 (D) package with θJA = 160°C/W, this corresponds to ~125°C ambient at full 2.3mA/channel quiescent dissipation with no airflow - verified in the "Power Dissipation and Thermal Protection" section of SBOS510B.

Can the OPA2141AID be used in a dual-supply configuration with asymmetric rails, such as +15V and –5V?

Yes, the OPA2141AID supports asymmetric dual supplies as long as total supply voltage (V+ – V–) remains within ±2.25V to ±18V limits - i.e., V+ – V– ≤ 36V and ≥ 4.5V. With +15V/–5V (20V total), the device operates normally; however, input common-mode range becomes (V–)–0.1V to (V+)–3.5V (–5.1V to +11.5V), and output swing adjusts accordingly.