SIT3485ESA
SIT
Needs validationmedium risk
SIT3485ESA is a 3.3V RS-485 functional alternative with important caveats.
Best Alternatives to COSMAX13487EESA
COSMAX13487EESA is a SOP-8 RS-485/RS-422 transceiver with auto-direction. Current alternatives need pinout and control-mode review.
AI replacement insight
Electrical riskhigh
supply and temp ranges differ
Package riskmedium
SOP-8 matches but pinout is unchecked
Firmware riskmedium
manual DE/RE control may be needed
Sourcing risklow
kept parts are indexed
Can it be replaced directly?
No proven pin-compatible replacement is supported by the provided evidence.
Best replacement path
Start with SIT3485ESA for 3.3V systems or MAX485ED for 5V systems, then verify pinout and control.
Main risk
Auto-direction and pinout are not confirmed for the candidates.
Recommended alternatives
2Alternative comparison matrix
| Feature / factor | COSMAX13487EESA | SIT3485ESA | MAX485ED | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOP-8 | SOP-8 | - | SOP-8 — same package name | |
| Pinout | 8-pin auto-dir RS-485 | 8-pin RS-485 | - | 8-pin RS-485 — pin functions not checked | |
| Voltage | 3.3V to 5.5V | 3.0V to 3.6V | - | 4.75V to 5.25V — not for 3.3V rails | |
| Temperature | -40C to +125C | -40C to +85C | - | -40C to +85C — lower high-temp limit | |
| Interface | RS-485/RS-422 half | RS-485/RS-422 half | - | RS-485/RS-422 half — same bus role |
Application & sourcing insights
Questions & answers
SIT3485ESA is the closer 3.3V RS-485 candidate; MAX485ED may suit 5V designs. Both need FAE review.