Texas Instruments OPA2140AIDRGR

Overview

OPA2140AIDRGR from Texas Instruments is a dual-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, and 5.1 nV/√Hz input voltage noise density at 1 kHz - enabling high-resolution data acquisition and sensor signal conditioning in single- or dual-supply systems from 4.5 V to 36 V (±2.25 V to ±18 V).

For engineers reviewing the OPA2140AIDRGR datasheet, OPA2140AIDRGR pinout, OPA2140AIDRGR application, or OPA2140AIDRGR equivalent, key selection criteria include ultra-low 1 μV/°C max offset drift, 10 pA max input bias current, 250 nVPP 0.1–10 Hz noise, no phase reversal, and full –40°C to +125°C operation - critical for metrology-grade instrumentation and semiconductor test equipment.

Technical Context

The OPA2140AIDRGR implements a JFET-input front-end with complementary differential pair architecture, delivering high input impedance (>10¹³ Ω) and minimal input bias current drift over temperature. Its fully differential output stage supports rail-to-rail swing within 350 mV of each supply rail under 2-kΩ load, while maintaining 126 dB open-loop gain and 140 dB CMRR at 25°C.

This dual op amp operates with true single-supply capability down to 4.5 V and dual-supply symmetry as low as ±2.25 V. The internal thermal shutdown and output short-circuit protection (±30 mA sink/source) ensure robustness in lab and industrial environments without external current limiting.

Key Specifications

Pinout & Package

OPA2140AIDRGR is housed in an 8-pin SON (DRG) package with exposed thermal pad connected internally to V–. This thermally enhanced leadless package measures 2.0 mm × 2.0 mm × 0.6 mm and supports high-density PCB layouts while enabling efficient heat dissipation via soldered thermal pad to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2140AIDRGR, OPA2141AIDR trades extended temperature range and CMRR for lower cost and slightly better noise, while ADA4625-2ACPZ-R7 prioritizes bandwidth and voltage noise at the expense of common-mode rejection and phase-reversal immunity - making OPA2140AIDRGR optimal for metrology-grade DC stability where environmental extremes and signal integrity are non-negotiable.

Availability

OPA2140AIDRGR is available at Aetrix Electronics and suitable for chemistry analyzer front ends, semiconductor parametric testers, and DC power supply monitors requiring stable component supply across long production lifecycles and demanding thermal environments.

Supply support for OPA2140AIDRGR 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 OPAx140 family was engineered specifically for high-accuracy, low-drift signal conditioning in test & measurement, industrial process control, and analytical instrumentation - emphasizing JFET input integrity, rail-to-rail output usability, and robust operation across extreme temperatures.

FAQ

What is the maximum operating temperature range for OPA2140AIDRGR?

OPA2140AIDRGR is fully specified from –40°C to +125°C ambient temperature. All key parameters-including input offset voltage, offset drift, CMRR, and open-loop gain-are guaranteed across this full industrial and automotive under-hood range, making it suitable for harsh-environment deployments where thermal stability is critical.

Does OPA2140AIDRGR support true single-supply operation?

Yes, OPA2140AIDRGR supports true single-supply operation from 4.5 V to 36 V. Its input common-mode range extends to V– – 0.1 V, and its rail-to-rail output swings within 350 mV of both supply rails under 2-kΩ load - enabling direct interfacing with grounded sensors and modern low-voltage ADCs without level-shifting circuitry.

What is the purpose of the thermal pad on the DRG package of OPA2140AIDRGR?

The exposed thermal pad on the OPA2140AIDRGR DRG package is internally connected to the V– pin. It must be soldered to a PCB copper pour tied to the V– net to reduce junction-to-board thermal resistance to 23.3°C/W and prevent thermal shutdown during sustained 2-mA-per-amplifier operation. Leaving it floating degrades thermal performance and risks reliability.

Can OPA2140AIDRGR drive capacitive loads directly?

OPA2140AIDRGR is not optimized for direct capacitive load driving. For loads exceeding 100 pF, a series isolation resistor (e.g., 50 Ω) must be placed between the output and the load to maintain phase margin and prevent peaking or oscillation - as validated in Figure 6-19 and Figure 6-20 of the datasheet.

How does the no-phase-reversal feature benefit OPA2140AIDRGR in sensor applications?

The no-phase-reversal feature guarantees that OPA2140AIDRGR's output never inverts polarity even when input signals exceed the specified common-mode range - preventing catastrophic latch-up or false triggering in overvoltage-protected sensor circuits such as thermocouple amplifiers or fault-monitoring comparators where input transients are unavoidable.