The PDF-4A-100 SQ from Crane Aerospace & Electronics is a Power Divider with Frequency 0.001 to 0.2 GHz, Insertion Loss 1.3 dB, Isolation 20 dB, Input Power 2 W, Amplitude Balance ±0.4 dB. Tags: Flatpack, Lumped Element Power Divider. More details for PDF-4A-100 SQ can be seen below.