Editing Bipolar junction transistor (section)

=== Temperature sensors ===
{{Main|Silicon bandgap temperature sensor}}

Because of the known temperature and current dependence of the forward-biased base–emitter junction voltage, the BJT can be used to measure temperature by subtracting two voltages at two different bias currents in a known ratio.<ref>{{Cite web |url=https://www.analog.com/en/resources/design-notes/ic-temperature-sensors-find-the-hot-spots.html |title=IC Temperature Sensors Find the Hot Spots |date=February 21, 2002 |website=analog.com |access-date=January 12, 2025 }}</ref>