Part Number Frequency (MHz) Impedance Unbal./Bal. (ohms) Differential Balanced Imp. Average Insertion Loss when connected to the Si45XX chipset (Active OP) Return Loss (min) Phase Difference S-Param Product Life
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433MHz Impedance Matched Balun + Low Pass Filter Optimized for Silicon Labs (SiLabs): Si4455 and Si4460 chipsets.
Silicon Labs website

Silicon Labs
0433BM41A0019
DesignPckg-Si4455-WES0122
DesignPckg-Si4460-WES0123
424-444 50 Ω (single ended) Impedance matched to SiLabs Si4455 and Si4460 chipsets 0.9dB Typ@25C 1.5dB max. (-45 to +85C) 15 typ. 9.5 min. 180° ± 10 PROD JTI Mouser Digikey