LP3981-18B5F
Lowpower Semiconductor Co., Ltd.
Needs validationmedium risk
LP3981-18B5F is a close 1.8V 300mA LDO candidate, but pinout and 125C use need review.
Best Alternatives to RT9193-18GB
RT9193-18GB is a 1.8V 300mA SOT-23-5 LDO. Alternatives must match pinout, output voltage, caps, and temperature rating.
AI replacement insight
Electrical riskmedium
caps, EN, accuracy, PSRR need check
Package riskmedium
same package but pinout missing
Firmware risklow
no firmware interface
Sourcing riskmedium
lifecycle fields weak
Can it be replaced directly?
No pin-compatible replacement is verified from the provided evidence.
Best replacement path
Review LP3981-18B5F first as a close electrical and package candidate.
Main risk
Pinout and 125C operation are not confirmed.
Recommended alternatives
1Alternative comparison matrix
| Feature / factor | RT9193-18GB | LP3981-18B5F | Alt 2 | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-23-5 | SOT-23-5 | SOT-23-5 — same package | ||
| Pinout | 5-pin LDO | not provided | not provided — must verify pins | ||
| Voltage | 1.8V, 2.5-5.5V in | 1.8V, 2-6.5V in | 1.8V, 2-6.5V in — range covers | ||
| Current | 300mA | 300mA | 300mA — same rating | ||
| Temperature | -40 to 125C | -40 to 85C | -40 to 85C — temp derating |
Application & sourcing insights
Questions & answers
From the provided data, LP3981-18B5F is the closest candidate, but it still needs FAE review.