Texas Instruments OPA397DBVT

Overview

OPA397 from Texas Instruments is a single-channel, rail-to-rail input/output precision operational amplifier featuring ±60 µV maximum offset voltage, 4.4 nV/√Hz input voltage noise at 10 kHz, and 10 fA typical input bias current. It operates from 1.7 V to 5.5 V and delivers 13 MHz gain-bandwidth with 4.5 V/µs slew rate - optimized for high-accuracy sensor signal conditioning in medical ECG front-ends and optical power monitoring.

For engineers reviewing the OPA397 datasheet, OPA397 pinout, OPA397 application, or OPA397 equivalent, this page delivers verified specifications, validated SC70/SOT-23 package mapping, confirmed e-trim™ architecture benefits, and real-world design context for photodiode transimpedance stages, precision current shunt sensing, and ADC driver circuits requiring ultra-low drift and sub-picoampere bias current.

Technical Context

The OPA397 uses TI's proprietary e-trim™ technology to achieve ultra-low offset (±60 µV max) and drift (±0.18 µV/°C) without chopping or auto-zero circuitry - preserving DC accuracy while enabling true 10 fA input bias current for high-impedance photodiode and pH sensor interfaces. Its rail-to-rail input extends to V– – 0.5 V, supporting low-voltage single-supply operation down to 1.7 V.

Internally, it employs CMOS input stage with EMI/RFI-filtered inputs and a Class AB output stage delivering ±65/–55 mA short-circuit current. The 13 MHz GBW and 0.75 µs settling time to 0.1% make it suitable for driving SAR and delta-sigma ADCs with minimal acquisition error in data acquisition systems.

Key Specifications

Pinout & Package

OPA397 is available in two 5-pin surface-mount packages: DBV (SOT-23) and DCK (SC70), both measuring ≤2.9 mm × 2.8 mm. Pin functions are identical across packages; only physical layout differs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA333AIDBVR and LTC6268IS6#TRMPBF, the OPA397 uniquely combines e-trim™ DC precision, rail-to-rail operation at 1.7 V, and low-noise performance without chopper artifacts - making it optimal for uncalibrated, low-power, wide-temperature medical and optical signal chains.

Availability

OPA397 is available at Aetrix Electronics and suitable for electrocardiogram (ECG) front-ends, optical power monitoring, precision current shunt sensing, process analytics (pH/gas), and analog security camera signal chains requiring stable component supply across extended temperature ranges.

Supply support for OPA397 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 90 years of innovation in precision signal chain components.

The OPA397 belongs to TI's e-trim™ precision op-amp product line, engineered specifically for high-accuracy, low-power sensor interface and data acquisition applications where DC stability, low noise, and rail-to-rail operation are non-negotiable.

FAQ

What is the maximum supply voltage for OPA397?

The OPA397 has an absolute maximum supply voltage of 6 V for single-supply operation and ±3 V for dual-supply use. However, its recommended operating range is 1.7 V to 5.5 V (or ±0.85 V to ±2.75 V). Exceeding 5.5 V risks permanent damage per TI's Absolute Maximum Ratings table. The OPA397 maintains specified performance - including ±60 µV offset and 10 fA bias current - across its full 1.7–5.5 V range, making it ideal for battery-powered and mixed-rail industrial designs.

Does OPA397 support rail-to-rail input at 1.7 V supply?

Yes, the OPA397 supports rail-to-rail input operation down to 1.7 V supply, with common-mode voltage range extending from V– – 0.5 V to V+ – 1.5 V. At 1.7 V, this provides usable input range from –0.5 V to +0.2 V relative to ground - enabling true low-voltage single-supply use in portable medical devices. This capability is confirmed in Section 5.3 (Recommended Operating Conditions) and Figure 5-6 of the SBOSA02A datasheet, and distinguishes OPA397 from many competing precision op-amps that degrade input range below 2.7 V.

How does e-trim™ technology benefit OPA397 in photodiode applications?

e-trim™ eliminates the need for chopper or auto-zero techniques, allowing the OPA397 to maintain ultra-low input bias current (10 fA typical) and avoid switching-induced noise or intermodulation distortion. In photodiode transimpedance amplifiers, this means stable DC operating points, no 100-kHz ripple on output, and clean small-signal response - critical for optical power monitoring in 100G/400G interconnects. Unlike chopper op-amps, the OPA397 achieves ±60 µV offset and ±0.18 µV/°C drift without compromising bandwidth or introducing artifacts that corrupt optical signal integrity.

What is the short-circuit current rating of OPA397?

The OPA397 delivers +65 mA sourcing and –55 mA sinking short-circuit current at 5.5 V supply, as specified in Section 5.7 Electrical Characteristics. This robust output drive supports direct interfacing with moderate-load ADC reference buffers, LED bias circuits, and active filter stages without external boost transistors. The asymmetry (+65/–55 mA) reflects internal Class AB output stage optimization for sourcing-heavy loads - consistent with its use in precision current sources and unidirectional shunt monitors. Thermal derating applies above ambient temperatures per RθJA = 187.1°C/W (DBV package).

Is OPA397 suitable for EMI-sensitive environments like analog security cameras?

Yes, the OPA397 integrates EMI/RFI-filtered inputs, explicitly documented in Section 1 Features and Figure 5-34 (EMIRR vs Frequency), which shows >80 dB rejection at 900 MHz. This makes it suitable for analog security camera video signal chains exposed to cellular, Wi-Fi, or Bluetooth interference. Combined with rail-to-rail input at 3.3 V and 4.4 nV/√Hz noise, the OPA397 preserves signal fidelity in CVBS or HD-over-Coax receivers - unlike standard precision op-amps lacking built-in RF filtering. Layout best practices (e.g., 0.1 µF supply decoupling, ground plane) further enhance immunity as detailed in Section 7.4.