Texas Instruments OPA387DBVR

Overview

OPA387DBVR from Texas Instruments is a single-channel, ultra-high-precision zero-drift operational amplifier in a 5-pin SOT-23 (DBV) package. It delivers ±2 µV maximum input offset voltage, ±0.003 µV/°C drift, and 5.7 MHz gain bandwidth while operating from 1.7 V to 5.5 V single supply - enabling high-fidelity signal conditioning in 24-bit data acquisition systems and precision sensor front-ends.

For engineers reviewing the OPA387DBVR datasheet, OPA387DBVR pinout, OPA387DBVR application, or OPA387DBVR equivalent, this page provides verified technical context, real-world design implications of its zero-drift architecture, low 1/f noise performance, rail-to-rail input beyond supply rails, and validated alternatives for high-accuracy analog signal chains.

Technical Context

The OPA387DBVR implements a proprietary auto-zeroing and chopper-stabilized hybrid architecture with internal clocking at 100–150 kHz, enabling continuous offset correction without observable 1/f noise (177 nVPP, 0.1 Hz–10 Hz). Its input stage features EMI/RFI filtering and common-mode range extending ±100 mV beyond supply rails - critical for unregulated battery-powered instrumentation.

This architecture achieves flat input bias current over temperature (±150 pA max, –40°C to +125°C), eliminates need for system-level calibration in high-Z sensor interfaces, and maintains 135 dB open-loop gain and 40° phase margin into 100 pF capacitive loads - supporting stable operation in ADC driver and precision filter configurations.

Key Specifications

Pinout & Package

The OPA387DBVR is housed in a 5-pin SOT-23 (DBV) package with exposed pad option not supported - footprint compatible with industry-standard 2.9 mm × 1.6 mm layout and reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2057HS5#TRMPBF and AD8628ARTZ-REEL7, the OPA387DBVR uniquely combines 5.7 MHz bandwidth, 177 nVPP noise, and EMI filtering in a 570 µA package - making it the only option among the three qualified for high-speed, high-accuracy, and electrically noisy industrial DAQ front-ends.

Availability

OPA387DBVR is available at Aetrix Electronics and suitable for electronic thermometer, weigh scale, and temperature transmitter applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA387DBVR 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 precision signal chain solutions.

The OPA387DBVR belongs to TI's OPAx387 zero-drift op amp family, engineered specifically for ultra-high-accuracy DC-coupled measurement systems where offset, drift, and 1/f noise directly limit resolution in 16–24-bit data conversion.

FAQ

What is the maximum input common-mode voltage range for OPA387DBVR?

The OPA387DBVR supports a common-mode input voltage range extending ±100 mV beyond the supply rails - for example, from –0.1 V to 5.6 V with a 5.5 V supply. This rail-to-rail-plus capability enables direct interface with sensors referenced to ground or supply in single-supply systems, and eliminates level-shifting circuitry in industrial analog input modules. The specification is guaranteed across –40°C to +125°C.

Does OPA387DBVR require external compensation for unity-gain stability?

No, the OPA387DBVR is internally compensated for unity-gain stability and maintains ≥40° phase margin into 100 pF capacitive loads. This allows direct connection to ADC input capacitors, long PCB traces, or RC filters without external components. TI's datasheet confirms stable step response and <1% overshoot under these conditions - critical for maintaining fidelity in high-resolution DAQ systems using the OPA387DBVR as an ADC driver.

What is the typical input bias current of OPA387DBVR over temperature?

The OPA387DBVR exhibits flat input bias current behavior: ±30 pA typical and ±150 pA maximum across –40°C to +125°C. Unlike conventional CMOS op amps, its zero-drift architecture avoids exponential IB drift with temperature - enabling stable gain accuracy in high-impedance sensor interfaces (e.g., pH probes, photodiode transimpedance stages) without thermal recalibration. This is explicitly verified in Section 6.7 of the SBOS984G datasheet.

Can OPA387DBVR operate from a 1.8 V supply?

Yes, the OPA387DBVR is fully specified down to 1.7 V single supply - making 1.8 V operation well within its recommended range. At 1.8 V, it maintains ±2.5 µV max input offset voltage, 570 µA quiescent current, and functional rail-to-rail input/output swing. This enables use in space-constrained, battery-powered devices such as portable gas analyzers and handheld multimeters where the OPA387DBVR delivers uncompromised precision at ultra-low voltage.

Is OPA387DBVR suitable for driving 24-bit delta-sigma ADCs?

Yes, the OPA387DBVR is explicitly optimized for 24-bit delta-sigma ADC front-ends: its ±2 µV max offset contributes <0.5 LSB error in 5 V full-scale systems; 177 nVPP 0.1–10 Hz noise preserves dynamic range; and 5.7 MHz bandwidth supports anti-aliasing filter design with adequate phase margin. TI's application note SBAA343 validates OPA387DBVR in reference designs for ADS126x-family ADCs - confirming linearity degradation <1 ppm and THD+N < –105 dB.