Texas Instruments OPA141AIDGKT

Overview

OPA141AIDGKT from Texas Instruments is a single-channel, rail-to-rail output, JFET-input operational amplifier optimized for precision low-noise signal conditioning in high-impedance sensor and data acquisition systems. It delivers 10MHz gain bandwidth, 6.5nV/√Hz input voltage noise density at 1kHz, ±20pA max input bias current, and operates from ±2.25V to ±18V (or +4.5V to +36V single supply), enabling use in battery-powered medical instrumentation and industrial control front-ends.

For engineers reviewing the OPA141AIDGKT datasheet, OPA141AIDGKT pinout, OPA141AIDGKT application, or OPA141AIDGKT equivalent, key selection criteria include its 250nVPP 0.1Hz–10Hz integrated noise, no phase reversal under overdrive, 20V/ms slew rate, and MSOP-8 package compatibility with space-constrained PCB layouts requiring low-input-bias-current amplification.

Technical Context

The OPA141AIDGKT employs a JFET input stage with ultra-low input bias current (≤20pA) and wide common-mode range extending to V–, enabling direct interfacing with high-impedance sources like photodiodes and piezoelectric sensors without guard rings or bias compensation networks. Its unity-gain stable architecture supports precision closed-loop configurations down to G = +1 with minimal peaking up to 100pF capacitive load when isolated by a 50Ω series resistor.

Internally, it features phase-reversal protection that clamps output to the appropriate rail instead of inverting polarity when input exceeds V– –0.1V or V+ –3.5V, and thermal shutdown activates above +180°C junction temperature to prevent damage during sustained overload conditions.

Key Specifications

Pinout & Package

OPA141AIDGKT is housed in an 8-pin MSOP (DGK) package with exposed pad for enhanced thermal dissipation. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA140AIDBVR and OPA209AIDGKR, the OPA141AIDGKT uniquely balances ultra-low input bias current (≤20pA), 6.5nV/√Hz noise, rail-to-rail output, and –40°C to +125°C operation in a thermally enhanced MSOP-8-making it the most versatile choice for high-impedance, wide-temperature, single-amplifier precision signal chains.

Availability

OPA141AIDGKT is available at Aetrix Electronics and suitable for battery-powered instruments, industrial controls, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA141AIDGKT 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 excellence.

The OPA141AIDGKT belongs to TI's precision JFET-input op amp product line, engineered specifically for high-impedance, low-noise, wide-supply applications in medical, test equipment, and industrial sensing systems.

FAQ

What is the maximum supply voltage rating for OPA141AIDGKT?

The absolute maximum supply voltage for OPA141AIDGKT is ±20V, but the recommended operating range is ±2.25V to ±18V (or +4.5V to +36V single supply). Exceeding ±20V risks permanent damage. Operation at ±18V is fully specified over –40°C to +125°C, delivering 10MHz bandwidth and 20V/ms slew rate while consuming 1.8mA typical quiescent current. Always observe proper decoupling with 0.1μF ceramic capacitors at both V+ and V– pins.

Does OPA141AIDGKT support rail-to-rail input operation?

OPA141AIDGKT does not support rail-to-rail input-it features a common-mode input range from V– to (V+) –3.5V, meaning the positive input can swing down to the negative rail but cannot reach the positive rail. This V–-inclusive range enables true single-supply operation with ground-referenced inputs, but signals near V+ require attenuation or level shifting. The rail-to-rail capability applies only to the output stage, which swings within 350mV of both rails under 2kΩ load.

How does the no-phase-reversal feature of OPA141AIDGKT improve system reliability?

The no-phase-reversal feature prevents output polarity inversion when input signals exceed the linear common-mode range (e.g., during power-up transients or sensor overrange events). Instead of flipping to the opposite rail-which could latch comparators or corrupt ADC readings-the OPA141AIDGKT output saturates cleanly at the appropriate rail. This eliminates need for external clamping diodes in non-inverting configurations and enhances robustness in safety-critical medical and industrial monitoring systems using OPA141AIDGKT.

Can OPA141AIDGKT drive capacitive loads directly?

OPA141AIDGKT is not optimized for direct capacitive load driving: stability degrades above ~20pF without isolation. For loads >100pF, a series output resistor (ROUT = 50Ω typical) must be placed between the OPA141AIDGKT output and the capacitance to restore phase margin. Figure 19 in the SBOS510B datasheet confirms <5% overshoot with ROUT = 50Ω and CL = 100pF. Direct connection to ADC input capacitors or long cables without this isolation risks oscillation or settling errors in precision OPA141AIDGKT applications.

What thermal considerations apply to OPA141AIDGKT in MSOP-8 (DGK) package?

In the MSOP-8 DGK package, OPA141AIDGKT has a junction-to-ambient thermal resistance (θJA) of 180°C/W. At 1.8mA IQ and ±15V supplies, power dissipation is ~54mW-raising junction temperature by ~9.7°C above ambient. Under worst-case short-circuit (36mA sink/source), dissipation exceeds 540mW, triggering thermal shutdown above +180°C. To ensure reliability, use minimum 25mm² copper pour under the exposed pad and avoid stacking heat-generating components adjacent to OPA141AIDGKT.