Texas Instruments OPA602AU/2K5G4

Overview

OPA602AU/2K5G4 from Texas Instruments is a precision dielectrically isolated FET (Difet®) operational amplifier optimized for high-speed, low-noise signal conditioning in instrumentation and data acquisition systems. It delivers 6.5MHz gain bandwidth, 35V/µs slew rate, ±3000µV max input offset voltage, ±1pA max input bias current, and 0.01% settling in 1µs - enabling accurate pulse amplification and ADC driver applications in ultrasound and professional audio.

For engineers reviewing the OPA602AU/2K5G4 datasheet, OPA602AU/2K5G4 pinout, OPA602AU/2K5G4 application, or OPA602AU/2K5G4 equivalent, key selection criteria include its unity-gain stability with 1500pF capacitive load drive, ultra-low bias current over full common-mode range, and SOIC-8 packaging suitable for high-density analog layouts requiring ESD-sensitive handling.

Technical Context

The OPA602AU/2K5G4 employs monolithic Difet® construction to simultaneously achieve high-speed performance and precision DC characteristics. Its cascode input stage maintains ±1pA bias current across ±10.2V common-mode input range while delivering 88dB minimum open-loop gain and 80dB supply rejection at ±15V operation.

This architecture enables stable unity-gain operation and robust drive capability into reactive loads - critical for data conversion front-ends and optoelectronic transimpedance stages where dynamic accuracy and low distortion must coexist with low input current errors.

Key Specifications

Pinout & Package

OPA602AU/2K5G4 is housed in an 8-pin SOIC (D package), JEDEC MS-012 compliant, with 1.27mm pitch and moisture sensitivity level 3 (260°C reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA627AU and AD8065ARZ, the OPA602AU/2K5G4 uniquely balances FET-level input impedance, moderate speed, and on-chip offset trim - making it the most practical choice for production-grade ultrasound, audio, and medical instrumentation where reliability, layout simplicity, and parametric consistency matter.

Availability

OPA602AU/2K5G4 is available at Aetrix Electronics and suitable for ultrasound imaging systems, professional audio equipment, and medical patient monitoring devices requiring stable component supply across long product lifecycles.

Supply support for OPA602AU/2K5G4 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 heritage in precision op amp innovation.

The OPA602AU/2K5G4 belongs to TI's legacy Difet® precision op amp family, engineered specifically for applications demanding simultaneous high speed, ultra-low input current, and DC accuracy - such as sonar, medical diagnostics, and test instrumentation.

FAQ

What is the maximum capacitive load the OPA602AU/2K5G4 can drive while remaining stable?

The OPA602AU/2K5G4 is specified to drive up to 1500pF in unity-gain configuration without oscillation or phase margin degradation. This capability eliminates the need for series isolation resistors in many cable-driving applications, unlike many high-speed op amps that require compensation networks for loads above 100pF. Stability is verified per TI's SBOS155A datasheet under standard test conditions with ±15V supplies.

Does the OPA602AU/2K5G4 require external offset nulling in typical applications?

Yes - the OPA602AU/2K5G4 includes dedicated offset trim pins (Pins 1 and 5) and is designed for manual nulling using a 100kΩ potentiometer, as shown in Figure 2 of the SBOS155A datasheet. While its ±3000µV max offset is suitable for many AC-coupled uses, DC-critical applications like ECG front-ends benefit from trimming to reduce drift-induced baseline wander.

Is the OPA602AU/2K5G4 pin-compatible with other variants in the OPA602 family?

Yes - all OPA602 variants (AP, BP, AU, etc.) share identical SOIC-8 (D) or PDIP-8 (P) footprints and pinouts. The OPA602AU/2K5G4 uses the same SOIC-8 package and terminal assignment as OPA602AU and OPA602AUE4, enabling drop-in replacement within the same package type. However, offset voltage grade and temperature range differ between variants.

What is the recommended power supply bypassing scheme for the OPA602AU/2K5G4?

TI recommends placing a 0.1µF ceramic capacitor directly between each supply pin (Pins 4 and 7) and ground, with leads as short as possible. For applications involving heavy transient loads or fast edge rates, adding a 1.0µF tantalum capacitor in parallel improves high-current delivery. These components must be located within 5mm of the device pins to maintain stability and minimize noise coupling.

How does the Difet® construction of the OPA602AU/2K5G4 improve performance over standard JFET op amps?

Difet® (dielectrically isolated FET) construction in the OPA602AU/2K5G4 achieves ±1pA max input bias current without sacrificing voltage noise - delivering 13nV/√Hz at 1kHz, far lower than typical JFET op amps. This results from reduced gate leakage via dielectric isolation, enabling stable high-impedance sensor interfacing across the full ±10.2V common-mode range without performance collapse.