
HTCSEMI
HT3082EARZ is the closest catalog candidate, pending pinout review.
MAX485ESA is a 5V half-duplex RS-485/RS-422 transceiver in SOP-8. Candidate replacements need pinout and bus-mode review.
Speed, supply, and bus limits vary.
Kept parts are SOP-8.
Protocol remains RS-485.
Candidate lifecycles are limited.
No verified pin-compatible replacement is proven from the provided fields.
Review HT3082EARZ first, then confirm pinout, duplex, and common-mode limits.
Pinout and duplex evidence is missing for direct replacement claims.

HTCSEMI
HT3082EARZ is the closest catalog candidate, pending pinout review.
| Feature / factor | MAX485ESA | HT3082EARZ | MAX3085ESA+T-JSM | GM490E | Compatibility / risk |
|---|---|---|---|---|---|
| Interface | RS-485/422 | RS-485/422 | RS-485/422 | RS-485/422 | RS-485/422 — same protocol; MAX3085ESA+T-JSM: same protocol; GM490E: same protocol |
| Voltage | 5V | 5V | 3.0-5.5V | 3.0-5.5V | 5V / 3.0-5.5V — same supply; MAX3085ESA+T-JSM: covers 5V; GM490E: covers 5V |
| Temperature | -40..85C | -40..85C | - | - | -40..85C — same range |
| Package | SOP-8 | SOP-8 | - | SOP-8 | SOP-8 — same package; GM490E: same package |
| Pinout | MAX485 | unknown | unknown | - | unknown — must verify; MAX3085ESA+T-JSM: must verify |
| Application | half duplex | - | half duplex | full duplex | half duplex / full duplex — same duplex; GM490E: bus wiring differs |
| Current | 2.5 Mbps | - | 1 Mbps | 1 Mbps | 1 Mbps — lower speed; GM490E: lower speed |
HT3082EARZ is the closest listed candidate, but it still needs FAE pinout and duplex review.