Texas Instruments OPA4141AIPW

Overview

OPA4141AIPW from Texas Instruments is a quad, rail-to-rail output, JFET-input operational amplifier optimized for precision low-noise signal conditioning in single- or dual-supply 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). It is used in photodiode amplifiers and high-resolution data acquisition where low drift and wide input common-mode range (down to V–) are critical.

For engineers reviewing the OPA4141AIPW datasheet, OPA4141AIPW pinout, OPA4141AIPW application, or OPA4141AIPW equivalent, key selection criteria include its 250nVPP 0.1Hz–10Hz integrated noise, 10mV/°C max offset drift, rail-to-rail output swing into 2kΩ, and guaranteed operation from –40°C to +125°C in TSSOP-14 packaging.

Technical Context

The OPA4141AIPW implements a JFET-input stage with no phase reversal, enabling stable operation when inputs exceed the common-mode range. Its unity-gain stable architecture supports closed-loop gains ≥1 with minimal peaking up to 100pF capacitive loads when isolated by a series output resistor.

It features internal thermal shutdown triggered at ~180°C junction temperature, with hysteresis ensuring re-enablement only below ~165°C. The device maintains 126dB typical open-loop gain and 120dB CMRR over temperature, supporting precision DC-coupled measurement paths in industrial sensor front-ends.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.4mm × 5.0mm body, 0.65mm pitch, exposed pad not electrically connected; rated for surface-mount reflow per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4134IPW and ADA4625-4ACPZ-R7, the OPA4141AIPW uniquely balances 10MHz bandwidth, 6.5nV/√Hz noise, 2.3mA/channel IQ, and –40°C to +125°C operation-making it optimal for space-constrained, wide-temperature industrial signal chains where power and noise are co-optimized.

Availability

OPA4141AIPW is available at Aetrix Electronics and suitable for photodiode amplifiers, industrial temperature sensor interfaces, and battery-powered medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA4141AIPW 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 amplifiers, data converters, and power management ICs.

The OPAx141 family was designed for high-accuracy, low-power signal conditioning in harsh environments-targeting industrial automation, test equipment, and medical diagnostics where JFET input performance meets extended temperature and reliability requirements.

FAQ

What is the maximum capacitive load the OPA4141AIPW can drive without instability?

The OPA4141AIPW remains stable with up to 100pF capacitive load when configured as a unity-gain buffer and isolated by a 50Ω series resistor at the output. Without isolation, oscillation risk increases beyond 20pF. Figure 19 in the SBOS510B datasheet quantifies overshoot vs. load for various ROUT values-designers should verify stability using actual PCB parasitics and load conditions. The OPA4141AIPW's internal compensation is optimized for resistive loads; reactive loading requires empirical validation.

Does the OPA4141AIPW support true rail-to-rail input operation?

No-the OPA4141AIPW does not support rail-to-rail input. Its common-mode input range extends to (V–) –0.1V but only to (V+) –3.5V at ±18V supplies. This means the positive input cannot accept signals within 3.5V of V+, limiting use in high-side sensing without level-shifting. However, the ability to operate with inputs at V– makes it ideal for single-supply configurations where sensors reference ground. Input protection diodes clamp signals beyond the rails, requiring external current limiting if overvoltage is possible.

How does the OPA4141AIPW's 0.1Hz–10Hz noise performance compare to its broadband noise?

The OPA4141AIPW specifies 250nVPP integrated noise over 0.1Hz–10Hz and 42nVRMS over the same band, reflecting dominant 1/f noise behavior typical of JFET inputs. At 1kHz, its voltage noise density drops to 6.5nV/√Hz-a flat broadband region. This dual-characteristic profile makes it superior to bipolar op amps in low-frequency precision applications (e.g., weigh scales) while retaining competitive mid-band performance for data acquisition. The 250nVPP value directly impacts DC stability in integrators and sensor offsets.

Can the OPA4141AIPW be used in dual-supply configurations with asymmetric voltages?

Yes-the OPA4141AIPW does not require symmetrical supplies. It operates with total supply voltage from +4.5V to +36V, meaning V+ and V– can be set to any combination meeting V+ – V– ≥ 4.5V (e.g., V+ = +12V, V– = –5V). However, the common-mode input range and output swing scale relative to the actual rail values. Asymmetric operation is commonly used in mixed-signal systems where analog sections run at different potentials than digital logic. Ensure decoupling capacitors reference local V+ and V–.

What thermal considerations apply to the OPA4141AIPW in TSSOP-14 packaging?

The OPA4141AIPW in TSSOP-14 has a junction-to-ambient thermal resistance (qJA) of 135°C/W under JEDEC-standard board conditions. With 3.1mA max quiescent current per channel (12.4mA total), dissipation reaches ~223mW at ±18V-raising junction temperature by ~30°C above ambient. To stay below the 150°C absolute max, ambient must remain ≤120°C. Layout best practices include thermal vias under the exposed pad (though unconnected), 200-mil copper pours on inner layers, and avoiding adjacent heat sources. Thermal shutdown activates at ~180°C with 15°C hysteresis.