Identification of RF power transistor

Papabravo

Joined Feb 24, 2006
18,806
I have acquired a couple of these but can't find a data sheet. Any ideas?

Markings: 'ST' logo; 1222-13 56A

Thanks.
Best guess is a custom design for a customer. The markings would be intelligible to the company and the customer, but nobody else. The datasheet is probably buried in deep underground vaults. There is hope if you have half a million dollars to invest in a network analyzer and an s-parameter test set, you can characterize them yourself
 
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