LP3981-18B5F
Lowpower Semiconductor Co., Ltd.
Needs validationhigh risk
LP3981-18B5F is a cautious 1.8V LDO alternative if 300mA is enough.
Best Alternatives to RT9013-18GB
RT9013-18GB is a 1.8V 500mA high-PSRR LDO in SOT-23-5. Current candidates need pinout and load review.
AI replacement insight
Electrical riskhigh
300mA candidate vs 500mA target
Package riskmedium
SOT-23-5 matches, pinout missing
Firmware risklow
No firmware interface
Sourcing riskmedium
Lifecycle field is unclear
Can it be replaced directly?
No verified pin-compatible replacement is proven from the provided data.
Best replacement path
LP3981-18B5F is the closest kept option only for loads at or below 300mA.
Main risk
Pinout is not verified and current rating is lower.
Recommended alternatives
1Alternative comparison matrix
| Feature / factor | RT9013-18GB | LP3981-18B5F | Alt 2 | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-23-5 | SOT-23-5 | SOT-23-5 — same package | ||
| Pinout | not provided | not provided | not provided — must verify | ||
| Voltage | Vin up to 7V | Vin 2-6.5V | Vin 2-6.5V — less headroom | ||
| Current | 500mA | 300mA | 300mA — load derating |
Application & sourcing insights
Questions & answers
From the provided candidates, LP3981-18B5F is closest, but only as a reviewed lower-current option.