What's the difference between the HMC550, 550A, 550E, 550AE?? Which one(s) are suitable for new designs?
The "E" suffix on the part number of HMC series plastic packaged products identifies RoHS compliance (Pb-free). See the link below for RoHS compliance program.
HMC550/HMC550E will be obsolete due to process discontinuation (http://www.hittite.com/Lyris/PCN/HMC550_PCN.pdf) so they are not recommended for new designs. The recommended replacement parts for new designs are HMC550A/HMC550AE ("A" in the part number identifies the replacement part). HMC550A/HMC550AE are in the same package/pin outs and support the same operating conditions and electrical specifications as HMC550/HMC550E, targeted as a drop in replacement.
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