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The HMC650, HMC651, HMC652, HMC653, HMC654, HMC655, HMC656, HMC657 and HMC658 are a line of wideband fixed value 50 Ohm matched attenuator chips which offer relative attenuation levels of 0, 2, 3, 4, 6, 10, 15 and 20 dB respectively, and exhibit better than 15 dB return loss over the DC to 50 GHz frequency range.