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We do not have an integrated dual PHY. The most direct drop in vs the MCP2551 CAN transceiver is the SN65HVD251 and SN65HVD251-Q1 (Q100 automotive qualified version). The Rs pin equation is a little different between the HVD251 and the MCP2551 so if you wanted to use it directly and used the slope mode care on the R value needs to be considered per the datasheet. Other options are the SN65HVD256 (industrial CAN transceiver) with I/O level shifting (5V CAN with 3.3V i/o) and the automotive family SN65HVDA54x-Q1 where there are multiple versions in the family with I/O level shifting, with and without wake up request via RXD. These are all state of the art transceivers recently released vs the older CAN architecture you are using. Depending on your other application requirements one may be a better fit vs another one. Another option depending on the other application requirement you have is a 3.3V CAN transceiver. These work with supply voltage of 3.3V, just the common mode point of the transceiver is a little lower vs the 5V CAN since the Vcc/2 point is lower. Differential levels for dominant and recessive are still CAN. The basic analogy is a 5V CAN transceiver with a lower Vcc, but a normal 5V CAN transceiver couldn't do this as they don't have the headroom to work at 3.3V. The best choice from that would be the SN65HVD233/34/35 as the DC stand off voltage matches automotive (+/-36V). A simple link to drop into a lot of information on TI CAN is www.ti.com/can -- Scott