An n-p-n transistor can be considered to be equivalent to two diodes,
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![Cross section of a diode-connected NPN transistor with its parasitics [17]. | Download Scientific Diagram](https://www.researchgate.net/profile/Maysam-Ghovanloo/publication/2982651/figure/fig9/AS:668454646452242@1536383415960/Cross-section-of-a-diode-connected-NPN-transistor-with-its-parasitics-17.png "Cross section of a diode-connected NPN transistor with its parasitics [17]. | Download Scientific Diagram")