
HTCSEMI
HT6575ARZ may fit 3.3V RS-485 use, pending pinout and bus-load review.
SP3485EEN replacements should be checked as 3.3V half-duplex RS-485 transceivers in SOP-8. Pinout evidence is missing for all candidates here.
Speed, voltage range, and unit load vary.
Kept candidates are SOP-8.
Same RS-485 role, but timing may change.
Lifecycle fields are not definitive.
No verified pin-compatible replacement is proven from the provided fields.
Start with HT6575ARZ or HT3485EARZ, then verify pinout, duplex, unit load, and baud margin.
Unverified pinout and missing duplex or bus-load data.

HTCSEMI
HT6575ARZ may fit 3.3V RS-485 use, pending pinout and bus-load review.
| Feature / factor | SP3485EEN | HT6575ARZ | HT3485EARZ | MAX3085ESA+T-JSM | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOP-8 | SOP-8 | SOP-8 | SOP-8 | SOP-8 — same package; HT3485EARZ: same package; MAX3085ESA+T-JSM: same package; ILX3485DT: same package |
| Pinout | 3485 map | missing | missing | missing | missing — not verified; HT3485EARZ: not verified; MAX3085ESA+T-JSM: not verified; ILX3485DT: not verified |
| Voltage | 3.0-3.6V | 3.3V | 3.3V | 3.0-5.5V | 3.3V / 3.0-5.5V — range not shown; HT3485EARZ: range not shown; MAX3085ESA+T-JSM: covers target; ILX3485DT: range not shown |
| Interface | RS485/422 half | RS485/422 | 10Mbps, duplex? | RS485 half | RS485/422 / 10Mbps, duplex? / RS485 half — duplex missing; HT3485EARZ: speed derating; MAX3085ESA+T-JSM: same duplex; ILX3485DT: duplex missing |
| Application | 12Mbps, 1/8UL | 15Mbps, UL? | - | 1Mbps, 256 nodes | 15Mbps, UL? / 1Mbps, 256 nodes / 5Mbps, 32 nodes — speed ok; load missing; MAX3085ESA+T-JSM: low-speed only; ILX3485DT: smaller bus |
| Temperature | -40 to 85C | - | -40 to 85C | - | -40 to 85C — same range |
From these fields, HT6575ARZ is the leading candidate, but it still needs pinout, duplex, and unit-load review.