I'm looking into repairing a circuit board that was passed on to me damaged. There is a set of four diodes which are used in conjunction with a MAX3488 transceiver to provide an RS422/485 connection. Two of these diodes are visibly damaged, probably due to excessive voltage applied at the adjacent connector. I intend to replace the diodes, and potentially the MAX3488 too.
As is seen above, the the two outer diodes are toast - one is gone completely, showing the silkscreen diode symbol beneath. The remaining two are simply labelled 752. The nearby silkscreen describes these parts as DZ1 through DZ4, and as (RD7.5S)x4. Quickly using a multimeter in diode testing mode showed drops of 0.713V and 0.715V over the intact ones, and nothing in reverse bias.
My current guess from these markings is that these are 7.5V zener diodes, based on the use of 'ZD' to describe them. I'm not sure what the 'RD' would mean though, or the 'S'. I've searched for part numbers / datasheets relating to the '752' marking, but found nothing. In terms of package, they appear to be roughly 1.6mm x 1.2mm in size (per the image below), and the best match I've found for their dimensions and general look is the SOD323 package.
Am I correct in concluding that these are 7.5V Zener Diodes, in a SOD323 package? Is there any other information I'd need before I start to search for a supplier?