Found 4 alternatives for PMA5105 by Rochester Electronics, LLC. Rf Transceiver Ics — 38-TFSOP (0.173", 4.40mm Width).
IC RF TXRX+MCU ISM<1GHZ 38TFSOP
8-BIT FLASH MCU, 8051 CPU, 12MHZ
ASK/FSK 315 MHZ WIRELESS TRANSVR