Texas Instruments OPA4187ID

Overview

OPA4187ID from Texas Instruments is a quad-channel, 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, and 100 µA quiescent current per amplifier across ±2.25 V to ±18 V supply range - enabling high-accuracy current sensing in 4–20 mA transmitter front-ends.

For engineers reviewing the OPA4187ID datasheet, OPA4187ID pinout, OPA4187ID application, or OPA4187ID equivalent, key selection criteria include ultra-low drift performance over –40°C to +125°C, input common-mode range extending to the negative rail, EMI-filtered inputs, and compatibility with low-power, high-impedance sensor interfaces requiring <1 µV/°C thermal stability.

Technical Context

The OPA4187ID uses auto-zeroing architecture with chopper-stabilized input stage and notch-filtered feedback path to continuously correct input offset and its temperature drift. Its dual-stage transconductance design enables unity-gain stability while maintaining 550 kHz gain-bandwidth product and 0.2 V/µs slew rate.

Each of the four independent amplifiers supports rail-to-rail output swing within 5 mV of supply rails under no load and 75–125 mV under 10 kΩ load, with input bias current as low as 100 pA (typ) and common-mode rejection ratio up to 145 dB at ±18 V supply - critical for rejecting noise in analog input modules interfacing to RTDs, strain gauges, or pH electrodes.

Key Specifications

Pinout & Package

OPA4187ID is packaged in a 14-pin SOIC (D package) with body size 8.70 mm × 3.90 mm, rated for operation from –40°C to +125°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4187ID, OPA4182IDR trades ultra-low drift for higher speed and higher power, while LTC2057HMS#PBF offers lower initial offset but significantly higher drift and power - making OPA4187ID the optimal balance for industrial transmitters requiring <0.1 µV/°C stability at <500 µA total quiescent current.

Availability

OPA4187ID is available at Aetrix Electronics and suitable for pressure transmitter design, analog input module development, and semiconductor test fixture build-out requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for OPA4187ID 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.

The OPAx187 series was developed specifically for high-accuracy industrial process control and test equipment, targeting applications demanding near-zero thermal drift, low power, and robust EMC performance in harsh electromagnetic environments.

FAQ

What is the maximum operating temperature range for the OPA4187ID?

The OPA4187ID is specified for continuous operation from –40°C to +125°C ambient temperature, with full electrical performance guaranteed across this range per the SBOS807E datasheet Section 6.3. This makes OPA4187ID suitable for deployment inside enclosures exposed to direct sunlight or located near high-power industrial machinery where case temperatures exceed 100°C.

Does the OPA4187ID support single-supply operation?

Yes, the OPA4187ID supports true single-supply operation down to 4.5 V total supply (e.g., 0 V and +4.5 V). Its input common-mode range extends to the negative rail (0 V), and its rail-to-rail output swings within 15 mV of both rails under 10 kΩ load - enabling direct interface to 3.3 V or 5 V microcontrollers and ADCs without level-shifting circuitry.

How does the auto-zeroing architecture of the OPA4187ID affect its noise performance?

The OPA4187ID's auto-zeroing architecture eliminates 1/f noise and reduces integrated 0.1–10 Hz noise to 0.4 µVPP, while preserving 15 nV/√Hz broadband noise density at 1 kHz. This dual-noise profile enables high-resolution DC measurements (e.g., pH electrode output) without compromising AC signal fidelity in mixed-signal sensor systems.

Can the OPA4187ID drive capacitive loads directly?

The OPA4187ID is characterized to drive ≥100 pF capacitive loads stably in unity-gain configuration per Figure 22 of SBOS807E. For loads >100 pF, a series isolation resistor (e.g., 25 Ω) between output and capacitance is recommended to maintain phase margin and prevent peaking - critical when driving ADC input filters or long PCB traces.

What packaging options are available for the OPA4187ID?

The OPA4187ID designation specifically refers to the 14-pin SOIC (D package) variant with 8.70 mm × 3.90 mm body size. Other OPA4187 variants include TSSOP (PW) and WQFN (RUM) packages, but OPA4187ID denotes only the SOIC version - confirmed by TI's official orderable part numbering and package addendum in SBOS807E.