
YLPTEC
RSM3485ECHT is the closest TD301M485 candidate but needs pinout and current review.
TD301M485 is a 3.3V isolated RS-485 DIP-8 module. The closest catalog candidate found is RSM3485ECHT, pending pinout review.
RSM3485ECHT has higher quiescent current.
Closest candidate is DIP-8 with 8 pins.
Auto flow-control behavior is not confirmed.
Kept candidate is indexed and Active.
No verified pin-compatible replacement is supported by the provided evidence.
Review RSM3485ECHT first for pinout, flow-control behavior, and current budget.
Pinout and module behavior are not verified.

YLPTEC
RSM3485ECHT is the closest TD301M485 candidate but needs pinout and current review.
| Feature / factor | TD301M485 | RSM3485ECHT | Alt 2 | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | DIP-8, 8 pin | DIP-8, 8 pin | DIP-8, 8 pin — Mechanical match shown | ||
| Interface | isolated RS-485, 3.3V UART | isolated RS-485 module | isolated RS-485 module — Same role | ||
| Voltage | 3.15V~3.45V | 3.15V~3.45V | 3.15V~3.45V — Supply range aligns | ||
| Current | 22mA Iq | 36mA Iq | 36mA Iq — Higher idle current | ||
| Temperature | -40C~85C | -40C~85C | -40C~85C — Range aligns | ||
| Pinout | not provided | not provided | not provided — No pin map evidence |
RSM3485ECHT is the closest candidate from the provided catalog data, but it needs pinout and current review.