OPA642N/3K

Instrumentation, Op Amps, Buffer Amps Overview

The OPA642N/3K is a wideband, low distortion operational amplifier manufactured by Texas Instruments in the SOT-23-5 package. It features a unity gain stable voltage feedback architecture with two internal gain stages. Key electrical specifications include a gain bandwidth product of 210 MHz and a closed-loop bandwidth of 400 MHz at a gain of +1 V/V. The device operates on dual supplies ranging from ±4.5 V to ±5.5 V, drawing a quiescent current of 25 mA. It provides high output current drive capability of ±60 mA and achieves fast 12-bit settling time of 13 ns at 0.01%. Input characteristics include an input offset voltage of ±4 mV and low noise density of 2.7 nV/√Hz.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Provides exceptionally low harmonic distortion over a wide frequency range using a classic differential input architecture for bias current cancellation.
• Features very low differential gain and phase error suitable for precision video line driving applications.
• Delivers high open-loop gain and common-mode rejection for accurate signal processing.

Instrumentation, Op Amps, Buffer Amps Applications

• ADC/DAC buffer amplifiers
• Low distortion IF amplifiers
• High resolution imaging systems
• Medical imaging equipment
• Test instrumentation

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify that the specific part number suffix matches the required packaging configuration. Confirm the operating temperature range aligns with system requirements. Ensure power supply decoupling capacitors are placed correctly near the pins to minimize lead inductance and optimize performance.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when high dynamic range and wide bandwidth are critical. Consider the OPA643 if higher gain-bandwidth or lower noise is required. Evaluate resistor values carefully to balance noise performance against parasitic capacitance effects in the feedback network.

Instrumentation, Op Amps, Buffer Amps Part Context

This device belongs to the Burr-Brown family of wideband operational amplifiers acquired by Texas Instruments. It utilizes a voltage feedback topology distinct from current feedback amplifiers, offering familiar precision benefits such as bias current cancellation.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

OPA643

Instrumentation, Op Amps, Buffer Amps FAQ

How does the OPA642 handle capacitive loads?

Driving capacitive loads can cause stability issues; adding a series isolation resistor at the output is recommended to prevent peaking or loss of stability.

What is the benefit of using all four power supply pins?

Using all four power supply pins lowers power supply impedance, which improves distortion performance compared to using only two pins.