2.4 GHz Low Pass Filter matched to BLUENRG-LP-LPS (BLUENRG-3x5Vx, BLUENRG-3x5Ax, BLUENRG-332xx) in QFN & CSP packages 0.68 511-MLPF-NRG-01D3 https://www.mouser.co.uk/ProductDetail/STMicroelectronics/MLPF-NRG-01D3?qs=T%252BzbugeAwjikYnc6oXMBiQ%3D%3D STMicroelectronics MLPF-NRG-01D3
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