I want to order a few RFM95 modules in China but I wonder if there is some technical difference between the 95 and the 95W.
I can see on this pictureRFM95 backside
that there is a box for 315/434/868/915 band , a box for 95/96/98 type and also a box for the ‘W’ . So there must be some difference between the 95 and 95W but I can’t figure what this difference is. Neither can I find it in the datasheet.
I want to be sure to order the best one so I ask here if anyone knows the difference.
The W version is in theory compliant with internationnal rules, such as RoHS and others, enabling them to be embedded in project looking at some CE and/or FCC marking. The non W version is - in theory - targeted at market without such requirement, probably such as Chinese market. This is a general rule for HopeRF modules.
Do I understand you correctly that the RFM95W is compliant for CE marking? And as we are using the 868MHz band I am wondering what the CE requirements are. Does anybody has experience with the CE stuff?
Those without W are meant for Chinese market. If they are sold outside of China, those are considered not legal and probably bought from local market but resell on places like Aliexpress. That is what HopeRF told me.
I bought some RFM95 on AliExpress. They are cheaper than RFM95W but appear identical. Except for a blue marker dot on the bottom side near the “W”. Maybe there was a difference in the past but not anymore, except for that dot of blue marker (which anyone can either put there, or remove with some alcohol).
Even the datasheet does not mention any differences. It only mentions RFM95(W), everywhere in the datasheet.
That table says ‘no W’ = old version and ‘W’ = CE/FCC version for worldwide use.
It does however not mention if the modules have any differences or that they are equal. (Nor does the datasheet which I repeated.)
Without having seen the internals, my personal impression is that they are exactly identical.
The ‘W’ version gets an extra dot of blue marker ink on the bottom indicating that it is a ‘W’ version
and then probably some small fee will have to be paid in order to carry the CE/FCC compliance logo.
There is no CE/FCC logo printed on the RFM95W however. I presume this is what the dot of ink near the W actually implies and the RFM95W’s CE/FCC compliance is probably stated in some document.
It’s a guess but I think it’s close to reality.
Hoperf have two teams one for over see and another for domestic, some times the customer from outside China will manufacture the product at the China mainland the will send the BOM to the manufacturer and the manufacturer will find the part from Hoperf to avoid the interest conflict of two teams “W” means from Oversea team without “W” means from the domestic team. but the module with “w” and without “w” is no difference.