Texas Instruments OPA4140AIDR

Overview

OPA4140AIDR from Texas Instruments is a quad-channel, rail-to-rail output, JFET-input operational amplifier optimized for precision DC and low-frequency AC applications. It delivers 11-MHz unity-gain bandwidth, 20 V/μs slew rate, ±120 μV max input offset voltage, 1 μV/°C max offset drift, and 5.1 nV/√Hz input voltage noise density - enabling high-accuracy signal conditioning in data acquisition, instrumentation, and semiconductor test systems.

For engineers reviewing the OPA4140AIDR datasheet, OPA4140AIDR pinout, OPA4140AIDR application, or OPA4140AIDR equivalent, this page provides verified specifications, package-confirmed pin functions, real-world use cases, and two validated alternative parts - all aligned to the official SBOS498F (March 2023) production datasheet.

Technical Context

The OPA4140AIDR implements a JFET-input front-end with matched P-channel input transistors, delivering ultra-low input bias current (≤10 pA) and no phase reversal over full common-mode range. Its input stage operates down to the negative rail (V–), supporting single-supply interfacing with precision ADCs/DACs.

Internally compensated for unity-gain stability, it achieves 11-MHz bandwidth and 20-V/μs slew rate while drawing only 2 mA per channel. Thermal design is supported by R_θJA = 97°C/W (SOIC-14) and R_θJC(top) = 56°C/W, with full specification across –40°C to +125°C.

Key Specifications

Pinout & Package

OPA4140AIDR is supplied in a 14-pin SOIC (D package) with exposed pad not present. Pin functions are fully defined in TI SBOS498F Section 5.2 and validated for this exact variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4140AIDR, OPA4188AIDR offers superior DC drift performance but trades off 1/f noise and supply flexibility, while ADA4625-4ARUZ delivers higher speed at the cost of power efficiency and operating voltage range - making OPA4140AIDR optimal for wide-supply, low-noise, industrial-grade precision analog front-ends.

Availability

OPA4140AIDR is available at Aetrix Electronics and suitable for data acquisition, semiconductor test equipment, and lab instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA4140AIDR 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 expertise in high-precision op amp design and manufacturing.

The OPAx140 family was engineered for demanding precision analog signal chains - specifically targeting applications needing JFET input performance, rail-to-rail output, low 1/f noise, and robust operation from –40°C to +125°C.

FAQ

What is the maximum supply voltage for OPA4140AIDR?

The absolute maximum supply voltage for OPA4140AIDR is 40 V (single supply) or ±20 V (dual supply), per Section 6.1 of the SBOS498F datasheet. However, the recommended operating range is 4.5 V to 36 V (single) or ±2.25 V to ±18 V (dual). Exceeding 36 V risks permanent damage and invalidates parametric guarantees - always observe derating guidelines for reliability in industrial environments. OPA4140AIDR must never operate beyond these limits.

Does OPA4140AIDR support true single-supply operation with ground-referenced inputs?

Yes. OPA4140AIDR features an input common-mode range that extends to the V– rail (V– – 0.1 V), enabling direct connection of ground-referenced sensors without level-shifting circuitry. This capability is confirmed in Section 6.7 Electrical Characteristics (VCM min = V– – 0.1 V) and applies across the full –40°C to +125°C temperature range. OPA4140AIDR maintains rail-to-rail output swing under these conditions, preserving dynamic range in single-supply DAQ systems.

What is the thermal resistance (RθJA) of OPA4140AIDR in its SOIC-14 package?

Per Section 6.6 of the SBOS498F datasheet, the junction-to-ambient thermal resistance (RθJA) for OPA4140AIDR in the 14-pin SOIC (D) package is 97°C/W. This value assumes standard JEDEC 2-layer board conditions. For high-power-density layouts, designers should also consider RθJC(top) = 56°C/W and RθJB = 53°C/W to optimize heat transfer to internal planes or heatsinks. OPA4140AIDR's thermal performance supports continuous operation at full spec up to +125°C ambient.

How does OPA4140AIDR handle capacitive loads on its output?

OPA4140AIDR is not unity-gain stable into heavy capacitive loads. As shown in Figures 6-19 and 6-20 of SBOS498F, overshoot increases significantly above ~100 pF without isolation. The recommended solution is a series output resistor (ROUT ≈ 50 Ω) between the amplifier and load capacitance - this isolates the capacitive load from the feedback loop while preserving stability and settling behavior. This technique is explicitly documented in Section 7.3.2 and validated for OPA4140AIDR across all four channels.

Is OPA4140AIDR pin-compatible with other quad op amps like LM324 or TLV2464?

No. OPA4140AIDR uses a non-standard 14-pin SOIC pinout optimized for quad JFET performance - including dedicated V+ (Pin 4) and V– (Pin 11) pins, and channel-specific input/output assignments (e.g., +IN A = Pin 3, +IN D = Pin 12). LM324 and TLV2464 follow different pinouts (e.g., V+ at Pin 4, V– at Pin 11 for LM324, but channel mapping differs). Direct replacement requires PCB redesign. OPA4140AIDR's pin configuration is fixed per TI's mechanical drawing SLMS152B and cannot be substituted without layout changes.