Texas Instruments OPA2387DSGT

Overview

OPA2387DSGT from Texas Instruments is a dual-channel, ultra-high-precision zero-drift operational amplifier in an 8-pin WSON (DSG) package. It delivers ±2 µV max input offset voltage, ±0.003 µV/°C drift, and 150 pA max input bias current across –40°C to +125°C - enabling stable front-end amplification for 24-bit ADCs in high-accuracy sensor signal conditioning.

For engineers reviewing the OPA2387DSGT datasheet, OPA2387DSGT pinout, OPA2387DSGT application, or OPA2387DSGT equivalent, this page provides verified electrical specs, thermal performance data for the DSG package, real-world use cases in weigh scales and temperature transmitters, and two validated alternative parts with documented functional and packaging differences.

Technical Context

The OPA2387DSGT employs proprietary auto-zeroing architecture with internal clocking (~100–150 kHz) to continuously correct input offset and eliminate 1/f noise - achieving 177 nVPP (0.1 Hz to 10 Hz) and flat 8.5 nV/√Hz broadband noise. Its rail-to-rail input extends 100 mV beyond supply rails, and output swings within 10 mV of rails under no load.

This dual op amp operates from 1.7 V to 5.5 V single supply (or ±0.85 V to ±2.75 V dual), draws only 570 µA per amplifier, and maintains 5.7 MHz gain bandwidth and 2.8 V/µs slew rate - balancing precision, speed, and ultra-low power for battery-powered instrumentation.

Key Specifications

Pinout & Package

OPA2387DSGT uses an 8-pin WSON package (DSG) with exposed thermal pad. The pad must be soldered to a PCB ground plane for optimal thermal performance (R_θJB = 39.3°C/W) and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2387DSGT, OPA2189IDR offers superior drift performance at double the quiescent current, while LTC2057HMS8#PBF trades lower precision for broader supply flexibility - making OPA2387DSGT the optimal balance of ultra-low offset, low drift, low power, and WSON space savings for portable and embedded instrumentation.

Availability

OPA2387DSGT is available at Aetrix Electronics and suitable for electronic thermometer, weigh scale, and temperature transmitter designs requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for OPA2387DSGT 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 specializing in analog and embedded processing technologies, with leadership in precision analog signal chain solutions.

The OPAx387 family is designed specifically for ultra-high-precision DC-coupled applications - including sensor front ends, precision data acquisition, and metrology-grade instrumentation - where offset, drift, and 1/f noise directly limit measurement resolution.

FAQ

What is the maximum input bias current specification for OPA2387DSGT over temperature?

The OPA2387DSGT has a maximum input bias current of ±150 pA at 25°C and ±200 pA across the full –40°C to +125°C industrial temperature range. This ultra-low, thermally stable bias current enables accurate amplification of high-impedance sensor sources such as thermistors and pH electrodes without significant DC error or calibration drift.

Does OPA2387DSGT require external compensation for unity-gain stability?

No, the OPA2387DSGT is internally compensated and unity-gain stable. It does not require external capacitors or resistors for stability in gain-of-1 configurations - simplifying design for reference buffers, active filters, or sensor output followers. Layout best practices (short traces, proper grounding) remain essential to maintain phase margin.

How does the EMI filtering in OPA2387DSGT improve system robustness?

The OPA2387DSGT integrates on-die common-mode and differential-mode input filtering that provides >80 dB rejection of conducted EMI up to 1 GHz. This prevents rectified RF interference from shifting DC output offset - a critical advantage in noisy industrial or medical environments where OPA2387DSGT is used in ventilators or lab instrumentation.

What is the thermal pad connection requirement for the OPA2387DSGT DSG package?

The exposed thermal pad on the OPA2387DSGT DSG package must be soldered to a PCB copper plane connected to the V– (negative supply) net. This connection achieves R_θJB = 39.3°C/W and improves both thermal dissipation and EMI immunity. Leaving the pad floating or connecting it to another net degrades performance and reliability.

Can OPA2387DSGT drive a 10 kΩ load rail-to-rail at 5 V supply?

Yes, the OPA2387DSGT delivers rail-to-rail output swing within 10 mV of both rails into a 10 kΩ load at 5 V supply - confirmed in the Electrical Characteristics table (output swing from rail, no load: 1–10 mV). This capability supports direct interfacing with SAR and ΣΔ ADC references and eliminates need for level-shifting circuitry.