The CRF-20A-250 SQ from Crane Aerospace & Electronics is a Directional Coupler with Frequency 5 to 500 MHz, Coupling 20 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.75 dB, Directivity 18 dB. Tags: Flat Pack. More details for CRF-20A-250 SQ can be seen below.