Found 3 alternatives for EZ80F91WF01SBCG by Zilog. Rf Transceiver Modules And Modems — PCB Module.
RX TXRX MODULE 802.15.4 CHIP SMD
RX TXRX MOD ISM > 1GHZ U.FL SMD
ZIGBIT 2.4 GHZ AMPLIFIED WIRELES