For our SI4732 radio breakout, we're following the application note (https://www.skyworksinc.com/-/media/Skyworks/SL/documents/public/application-notes/AN383.pdf) for antenna setup.

It specifies a low-pass filter inductor of 4.7 µH with a Q factor greater than 20 at 25 MHz and minimal DC resistance. The recommended part, COILCRAFT 1008CS-472GLB (https://www.digikey.com/en/products/detail/coilcraft/1008CS-472XGRC/15794541), is somewhat pricey.

Let's explore some alternatives!

Recommended Alternatives:

Murata LQW2UAS4R7J00L: 4.7 µH, Q=20 @25 MHz, 260 mA, 4 Ω DCR, 1008 package.

Abracon AISC-1008-4R7J-T: 4.7 µH, Q=20 @25 MHz, 260 mA, 4 Ω DCR, 1008 package.

Murata LQW32FT4R7M8HL: 4.7 µH, Q=30 @25 MHz, 400 mA, 1.2 Ω DCR, 1210 package.