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Silicone Junction
4

Silicone Junction

Silicone Junction

(OP)
Can someone tell me?  Any design that I have seen using a silicone junction for temperature sensing always uses a transistor with the base tied to the collector.  

My question is why not just use a 1N914 diode?

RE: Silicone Junction

4
It's silicon, btw.  Silicone is used for implants and sealants.

Diodes are designed to handle significantly higher currents than base-emitter junctions, thus resulting in a much smaller region of linear operation.  EB junctions can have up to 6 decades of linear behavior as a function of current and are considered to be closer to an "ideal" diode than packaged diodes.

TTFN

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