Quick one. Repairing the RS-485 port on one of our own edge boxes (the one that polls Modbus meters and reports them to Hermetry as child devices); a surge took out the isolated transceiver. The BOM says ISO1410DWR. My distributor has ISO1410DW in stock today and the DWR in 6 weeks. Datasheet package table lists D and DW, the R isn’t explained anywhere I can see. Can I fit the DW?
Could the letters be a temperature grade? Some parts have an industrial version with a different suffix.
Fit it. Same part, same package. In TI’s naming the letters after the part number are the package code, and the final R is only the packing. DW is the wide-body SOIC-16 (7.5 mm body), D is the narrow SOIC (on this part the 8-pin one). The trailing R means tape and reel, usually 2000 pieces, no R means tube. If you look at the orderable parts table at the very end of the datasheet (“Package option addendum”), both rows show the same package and pin count, only “Package qty” differs.
Temperature grade on TI parts is in the part number body or a Q1 suffix for automotive, not those letters.
Don’t swap to the D version though. The wide body is there for creepage across the isolation barrier, the narrow 8-pin one has a lower isolation rating and a different pinout anyway. Check the TVS diodes on A/B while you have it open, if the transceiver died they probably took a hit too.
Fitted the DW from the tube, port is back and the meters reappeared as children within a minute. Both TVS diodes measured short, replaced those too. You were right about the package table at the end, I’d only looked at the one on page 1.
Good to know the R thing, I’ve wondered about that on other parts.
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