Transistor misterioso

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domanda al volo:
sapreste dirmi che tipo di transistor è questo?

https://drive.google.com/file/d/0bwppapcfshubm1r2a3lyb0f1qlk/view?usp=drivesdk

l'ho trovato nel datasheet di un ic (in particolare della alu 4 bit 74181), e sono curioso di capire cosa sia.
tra l'altro mi sembra di averlo già visto... :p

grazie per le future risposte.

sembra una specie di tiristore  una specie di interruttore


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