OPA643UB

Instrumentation, Op Amps, Buffer Amps Overview

The OPA643UB is a wideband, low distortion, high gain operational amplifier manufactured by Texas Instruments. It utilizes a de-compensated voltage feedback architecture with two internal gain stages to achieve exceptional dynamic range. The device operates within a supply voltage range of ±4.5V to ±5.5V and features an 8-pin SOIC surface-mount package. Key electrical specifications include a gain-bandwidth product of 800MHz, a slew rate of 1000V/μs, and an open-loop gain of 95dB. Input characteristics include a noise density of 2.3nV/√Hz and an input bias current of 30μA.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• De-compensated voltage feedback architecture providing high speed and dynamic range
• Low harmonic distortion performance across a wide frequency range
• High slew rate and high output current drive capabilities
• Stable operation at gains greater than or equal to 3

Instrumentation, Op Amps, Buffer Amps Applications

• Base station ADC preamplifier
• ADC/DAC buffer amplifier
• Low distortion IF amplifier
• Wideband transimpedance amplifier
• Video amplification

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific ordering suffix 'UB' against the manufacturer's official documentation to confirm the exact package type (SO-8) and temperature range (-40°C to +85°C). Ensure that the component source matches the authorized Burr-Brown/Texas Instruments distribution channels to guarantee authenticity and compliance with specified electrical parameters.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component for applications requiring high gain bandwidth and low distortion at moderate signal gains. It is suitable for designs where unity gain stability is not required, as the device is stable only at gains ≥ 3. Consider external compensation techniques if lower signal gains are necessary while maintaining high loop gain benefits.

Instrumentation, Op Amps, Buffer Amps Part Context

The OPA643 series includes variants such as the OPA643P, OPA643N, and OPA643NB, offering different packaging options including DIP, SO-8, and SOT23-5. The OPA643UB specifically denotes the surface-mount SO-8 version. This family is designed for high-speed analog signal processing tasks requiring precision and wide bandwidth.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

For applications requiring unity gain stability with comparable distortion performance, consider the OPA642.