There’s a 20-pin generic TSSOP, and some specific ICs that happen to have a TSSOP-28 package, but no generic TSSOP-28 package. Example: https://www.infineon.com/dgdl/Infineon-6EDL04X0XXX-DataSheet-v02_07-EN.pdf?fileId=db3a304336797ff901367c18c18445af
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