Bipolar Junction Transistor

Bipolar junction transistor, or BJT, is the incumbent transistor technology used as the contrast case in 真正改变世界的技术，为什么一开始都不被看好？| S10E16. The source says BJT devices were faster and more stable than early [[MOSFET|MOS]] devices, making them a better fit for [[ATT|AT&T]]’s communication-switching needs.

The episode does not portray BJT preference as simple foolishness. It uses the comparison to show why incumbent evaluation metrics can be locally rational while missing a challenger technology’s long-run scalability.

Connections

• Bell Labs and AT&T - research and telecom-market context.
• MOSFET / MOS Transistor - challenger technology compared with BJT in the source.
• Disruptive Innovation - concept the BJT/MOS contrast illustrates.