Texas Instruments OPA4187IRUMR

Overview

OPA4187IRUMR from Texas Instruments is a quad, zero-drift, rail-to-rail output operational amplifier optimized for precision low-voltage signal conditioning in industrial sensing and measurement systems. It delivers 10 µV max input offset voltage, 0.001 µV/°C drift, 15 nV/√Hz input voltage noise, 160 dB PSRR, and 100 µA quiescent current per amplifier across ±2.25 V to ±18 V supply range. It enables high-accuracy current sensing, pH/gas transducer front-ends, and analog input modules where long-term DC stability is critical.

For engineers reviewing the OPA4187IRUMR datasheet, OPA4187IRUMR pinout, OPA4187IRUMR application, or OPA4187IRUMR equivalent, key selection criteria include ultra-low drift performance at temperature extremes (–40°C to +125°C), microsize WQFN-16 package compatibility with space-constrained PCB layouts, rail-to-rail output swing within 15 mV of rails under load, and verified EMI-filtered inputs for noisy industrial environments.

Technical Context

The OPA4187IRUMR employs auto-zeroing and chopper-stabilized architecture to achieve near-zero input offset drift and eliminate 1/f noise-critical for DC-coupled sensor interfaces requiring decades-long calibration stability. Its input common-mode range includes the negative rail, enabling true single-supply operation down to 4.5 V total supply.

Each of its four amplifiers features independent high-impedance inputs (10¹² Ω || 4.2 pF), 140 dB CMRR, 160 dB open-loop gain, and 550 kHz gain-bandwidth product-supporting stable unity-gain configurations while maintaining precision in low-frequency (<10 Hz) measurement bands such as process analytics and semiconductor test.

Key Specifications

Pinout & Package

OPA4187IRUMR is housed in a 4.00 mm × 4.00 mm, 16-pin WQFN package with wettable flanks and exposed thermal pad (RUM suffix). The package supports automated optical inspection (AOI) and provides low 35.3°C/W junction-to-ambient thermal resistance for reliable operation in thermally dense industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4187IRUMR, OPA4182IDR offers higher speed at increased power and relaxed drift spec, while LTC2057HMS8#PBF delivers lower offset in a non-quad form factor-neither matches the OPA4187IRUMR's combination of quad integration, 0.001 µV/°C drift, and 100 µA IQ in WQFN.

Availability

OPA4187IRUMR is available at Aetrix Electronics and suitable for analog input modules, pressure transmitters, and semiconductor test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA4187IRUMR 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 over 50 years of innovation in precision signal chain solutions.

The OPAx187 series was designed specifically for high-stability, low-power industrial sensing-targeting applications like process analytics, flow/pressure transmitters, and modular I/O where decades-long calibration integrity is mandatory.

FAQ

What is the maximum operating temperature range for the OPA4187IRUMR?

The OPA4187IRUMR is fully specified from –40°C to +125°C ambient temperature. All key parameters-including input offset voltage drift (0.001 µV/°C), PSRR (160 dB), and quiescent current (100 µA)-are guaranteed across this range, making it suitable for under-hood automotive and industrial control cabinet deployments where thermal stress is extreme.

Does the OPA4187IRUMR support true single-supply operation?

Yes, the OPA4187IRUMR supports true single-supply operation from 4.5 V to 36 V total supply. Its input common-mode range extends to the negative rail (V–), and its rail-to-rail output swings within 15 mV of both supply rails-even with 10 kΩ loads-enabling direct interfacing with 3.3-V or 5-V ADCs without level-shifting circuitry.

How does the auto-zeroing architecture of the OPA4187IRUMR affect its noise performance?

The OPA4187IRUMR's auto-zeroing architecture eliminates 1/f (flicker) noise, resulting in flat 15 nV/√Hz input voltage noise density above 1 Hz and only 0.4 µVPP integrated noise from 0.1 Hz to 10 Hz. This enables stable DC measurements in low-frequency sensor applications-such as pH and gas concentration monitoring-where traditional op-amps exhibit significant drift-induced noise.

Can the OPA4187IRUMR drive capacitive loads without instability?

The OPA4187IRUMR is unity-gain stable and can safely drive ≥100 pF capacitive loads without external compensation. Typical overshoot remains <10% with 100 pF loads at G = +1, and small-signal settling to 0.01% occurs within 48 µs. For heavier loads (>500 pF), a series isolation resistor (25–50 Ω) is recommended per the datasheet layout guidelines.

Is the OPA4187IRUMR pin-compatible with other quad op-amps in WQFN-16 packages?

No-the OPA4187IRUMR has a unique pinout optimized for quad-channel independence and thermal performance, differing from standard WQFN-16 op-amp layouts (e.g., TLV9064 or MCP6004). Its pin assignments-such as dual OUT A pins (1 and 15) and shared V– on Pins 4 and 10-are specific to TI's zero-drift architecture and require dedicated PCB layout.