Hi Tech support,
Some HMC241QS16 parts are with ground pad and without ground pad.
May I know the reason why ?
Avnet Asia Pte Ltd
The HMC241QS16 is supplied in a plastic QSOP package which has not ground paddle at the bottom.
The other variant, HMC241LP3, use the same die but in different package, 3x3mm QFN Plastic Package, which has ground paddle at the bottom.
BTW, both HMC241QS16 and HMC241LP3 will be discontinued in Aug 2015. Instead, we recommend the drop-in replacement parts,HMC241AQS16 and HMC241ALP3, for new designs.
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