The B2R is a 2W plastic case low cost DC/DC converter
The B3R is a 3W plastic case low cost DC/DC converter
The B5R is a 5W plastic case, low cost DC/DC converter
The MSB/MS/MSM is an 1W, low cost SIP DC/DC converter
MSBH/MSH/MSL is a 2W, low cost SIP DC/DC converter
The MSV/MSVH is a 1-2W SIP DC/DC converter with High Isolation voltage