Found 3 alternatives for ATA8743-PXQW by Microchip Technology. Rf Transmitters — 24-VQFN Exposed Pad.
RF XMITTER UHF 868-928MHZ 24VQFN
RF XMITTER UHF 310-350MHZ 24VQFN
RF XMITTER UHF 429-439MHZ 24VQFN