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OPA846ID

TIOPA846ID

Texas Instruments
High-speed, low-noise amplifier with excellent slew and bandwidth characteristics for video and instrumentation alternatives.
NRND43,605 in stock
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Overview

The OPA846ID is a wideband, ultra-low noise, voltage-feedback operational amplifier designed for high-gain applications requiring high dynamic range. It features a very high 1.75 GHz gain bandwidth product and a fast 625V/us slew rate, making it ideal for precision high-speed signal chains. Note that this amplifier is decompensated and is specifically designed to be stable in noise-gain configurations of 7V/V or higher.

Why Choose This Part

It offers an exceptional balance of low input voltage noise (1.2 nV/rtHz) and high speed, which is rare for voltage-feedback architectures. The device operates across a wide supply range from 2.5V to 6V, providing flexibility for both single-supply and bipolar power rails in high-frequency designs.

Applications

High Dynamic Range ADC Preamps
Used as a low-noise buffer to drive high-speed analog-to-digital converters while maintaining signal integrity.
Transimpedance Amplifiers (TIA)
Ideal for wideband photodiode-to-voltage conversion in optical networking and sensing applications due to low input voltage noise of 1.2nV/rtHz.
Video Processing
Provides high-gain amplification for video signals where wide bandwidth and high slew rates are required to prevent distortion.
Precision Instrumentation
Utilized in low-noise front-ends for laboratory and industrial measurement equipment where a 150uV input offset voltage is beneficial.

Key Specifications

Slew Rate 625V/us
Mounting Type Surface Mount
Amplifier Type Voltage Feedback
Package / Case SC-74A, SOT-753
Current - Supply 12.6mA
Number of Circuits 1
Current - Input Bias 10 uA
Operating Temperature -40degC ~ 85degC
Gain Bandwidth Product 1.75 GHz
Voltage - Input Offset 150 uV
Supplier Device Package SOT-23-5
Current - Output / Channel 80 mA
Voltage - Supply Span (Max) 12 V
Voltage - Supply Span (Min) 5 V

Getting Started

When designing with the OPA846ID, use a low-impedance power supply with 0.1uF and 6.8uF decoupling capacitors placed as close to the pins as possible. Ensure a solid ground plane and minimize parasitic capacitance at the inverting input to maintain stability at its high gain bandwidth. TI offers the OPA846N/250 evaluation module for rapid performance verification of high-speed layouts.

Also Consider

OPA847ID TITexas Instruments - Provides even higher gain bandwidth (3.9 GHz) and lower noise for applications requiring stability at gains of 12 or higher.
OPA657 TITexas Instruments - A JFET-input high-speed amplifier with much lower input bias current (2pA) for extremely high-impedance transimpedance applications.