A' and 'B' suffix on HMC parts

Document created by analog-archivist Employee on Feb 23, 2016
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We are using HMC194MS8 on a LTB of 25:04:15. The suggested replacement is
HMC194AMS8E. The suffix E denotes Lead Free but what is the additional "A"?


The suggested replacement is HMC194AMS8E is a form, fit and functional
alternative to HMC194MS8/HMC194MS8E. We are exiting from a foundry. This part
is  from a  different foundry and process, different design but targeted with
same/better electrical performances and specifications.
In general, the HMC products that have 'A' suffix on the part number (p/n) are
translated versions of related HMC products without 'A' suffix on the p/n. This
can be due to a foundry change and/or more specifically due to a die change.
Similarly, the HMC products that have 'B' suffix on the p/n are the translated
versions of related HMC products with 'A' suffix on the p/n.

The replacement products are in the same package/pin outs and support the same
(or better) operating conditions and electrical specifications as the
discontinued products. However, related to a specific HMC part with 'A' and 'B'
kindly contact us to know about the form, fit, function and drop-in replacement
assurance of the alternative and a comparison between the datasheet has to be
made for more information.

For this specific p/n it is a FFF alternative.

We can look for more information on such requests over PCNs/PDNs. Currently,
the Hittite related information regarding discontinued products
(datasheets/replacement alternatives/announce/LTB) can be found on:

Another useful link on EZ for this discussion is: