HMC349A and HMC472A

Question

hi, what is the difference between HMC349 with HMC349A, and HMC472 with HMC472A? thanks.

FormerMember · Accepted Answer

Hello, 
 Some HMC products are/will be obsolete due to foundry/process discontinuation. Many of these have/will have replacement products designed in a similar process from a different foundry targeting functional drop-in replacement. "A" suffix on the part number is used to identify replacement products. 
 The HMC349A/HMC472A are the FFF (form, fit, functional) replacements of the HMC349/HMC472 and existing applications of original parts can switch to replacement parts without any change in design/performance. 
 Best.)

FormerMember · Answer

Hello, 
 HMC472ALP4E is completely a new design in a GaAs process from another foundry by targeting to meet or exceed the electrical performance/operating conditions of old HMC472LP4E. 
 Due to redesign of integrated 1-to-2 logic driver circuitry on each control paths (V1-V6), there could be some change in control current but the change is not such significant as you measured. 
 HMC472LP4E and HMC472ALP4E is measured to have control input resistances of around 150k and 100k respectively. 
 Best.

EZAdministrator · Answer

This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum. Thank you, EZ Admin

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HMC349A and HMC472A