
National Semiconductor
LP2980IM5X-3.3 is a same-voltage LDO candidate only for loads at or below 50mA.
RT9193-33GB is a 3.3V 300mA SOT-23-5 LDO. The reviewed list has no verified pin-compatible replacement.
Only kept candidate is 50mA.
SOT-23-5 matches, pinout unknown.
Analog LDO, no firmware.
PDF not checked.
No pin-compatible replacement is verified from these candidates.
Use a 3.3V LDO rated at least 300mA with matching SOT-23-5 pinout.
LP2980IM5X-3.3 is only 50mA and needs pinout review.

National Semiconductor
LP2980IM5X-3.3 is a same-voltage LDO candidate only for loads at or below 50mA.
| Feature / factor | RT9193-33GB | LP2980IM5X-3.3 | Alt 2 | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Application | 3.3V LDO | 3.3V LDO | 3.3V LDO — same regulator role | ||
| Package | SOT-23-5 | SOT-23-5 | SOT-23-5 — mechanical likely | ||
| Pinout | 5-pin LDO | 5-pin LDO | 5-pin LDO — no pin map checked | ||
| Current | 300mA | 50mA | 50mA — large derating | ||
| Temperature | -40 to 125C | -40 to 85C | -40 to 85C — range not covered |
From this list, no strong alternative is found. LP2980IM5X-3.3 is only a low-current 50mA candidate.