Operational Amplifier History
Last modified by Microchip on 2023/11/09 08:59
In the 1930s, the earliest vacuum tube op-amps were composed of discrete components: vacuum tubes and resistors. They were fundamentally large, bulky, power-hungry devices and were used primarily for analog computation.
Figure 1 shows a K2-W general-purpose computing op-amp from George A. Philbrick Researches. It was the first commercial op-amp, introduced to the market in 1952, more than a decade before the first transistorized version. In the 1960s, vacuum tube op-amps began to be replaced by miniaturized solid-state op-amps (Figure 2), which consist of transistors and resistors.
![Philbrick K2-W Op-Amp](/xwiki/bin/download/products/amplifiers-linear/operational-amplifier-ics/introduction/history/WebHome/philbrick-k2-w.png?rev=1.1)
Figure 1 - Philbrick K2-W Op-Amp
![741 Op-Amp](/xwiki/bin/download/products/amplifiers-linear/operational-amplifier-ics/introduction/history/WebHome/741.png?rev=1.1)
Figure 2 - 741 Op-Amp