
SIT
Closest electrical match, but duplex and pinout need review.
SIT3490EEUA is a full-duplex RS-485/RS-422 transceiver. Current alternatives need pinout and topology review.
duplex mode differs
MSOP-8 matches
driver enables may differ
lifecycle data mixed
No verified pin-compatible replacement is supported by the provided data.
Review SIT3088EEUA first if half-duplex operation is acceptable.
Full-duplex vs half-duplex topology and unverified pinout.

SIT
Closest electrical match, but duplex and pinout need review.
| Feature / factor | SIT3490EEUA | SIT3088EEUA | LTC2876CMS8E#TRPBF | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | MSOP-8 | MSOP-8 | MSOP-8 | MSOP-8 — same package; LTC2876CMS8E#TRPBF: case matches | |
| Pinout | 8-pin full-duplex | 8-pin, pin map absent | pin count missing | 8-pin, pin map absent / pin count missing — verify pins; LTC2876CMS8E#TRPBF: not proven | |
| Voltage | 3.0-5.5V | 3.0-5.5V | missing | 3.0-5.5V / missing — range matches; LTC2876CMS8E#TRPBF: must verify | |
| Temperature | -40 to 125C | -40 to 125C | max 70C | -40 to 125C / max 70C — range matches; LTC2876CMS8E#TRPBF: grade risk | |
| Interface | RS485 full 14M | RS485 half 14M | RS485/422 20M | RS485 half 14M / RS485/422 20M — topology differs; LTC2876CMS8E#TRPBF: protocol fits |
SIT3088EEUA is the closest listed candidate, but only as a reviewed functional alternative.