ETA3409S2F
ETA
Needs validationmedium risk
ETA3409S2F is a buck candidate; confirm pinout and power network before use.
Best Alternatives to RY3420
RY3420 is a 2A SOT23-5 synchronous buck regulator. Listed alternatives need pinout and power-stage review before use.
AI replacement insight
Electrical riskmedium
Frequency, mode and compensation may differ.
Package riskmedium
SOT23-5 matches, pin functions do not.
Firmware risklow
No firmware interface indicated.
Sourcing riskmedium
Lifecycle shown as dash for ETA parts.
Can it be replaced directly?
No confirmed pin-compatible replacement is proven from the supplied data.
Best replacement path
Start with ETA3409S2F or ETA3448S2F, then verify pinout, FB reference and BOM stability.
Main risk
Pinout and regulator loop compatibility are not verified.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | RY3420 | ETA3409S2F | ETA3448S2F | ETA3413S2F | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT23-5 | SOT23-5 | SOT23-5 | SOT23-5 | SOT23-5 — same package; ETA3448S2F: same package; ETA3413S2F: same package; ETA3418S2F: same package |
| Pinout | not provided | not provided | not provided | not provided | not provided — no pin map; ETA3448S2F: no pin map; ETA3413S2F: no pin map; ETA3418S2F: no pin map |
| Voltage | 2.5-5.5V | 2.4-7.3V | 2.5-5.5V | 2.6-5.5V | 2.4-7.3V / 2.5-5.5V / 2.6-5.5V / 2.6-7V — VIN covers target; ETA3448S2F: VIN match; ETA3413S2F: higher min VIN; ETA3418S2F: higher min VIN |
| Current | 2A | 3A | 3A | 2A | 3A / 2A / 2.5A — higher rating; ETA3448S2F: higher rating; ETA3413S2F: same rating; ETA3418S2F: higher rating |
| Temperature | -40 to 85C | -40 to 85C | missing | - | -40 to 85C / missing — same range; ETA3448S2F: not in keys; ETA3418S2F: not in keys |
| Application | 1.2MHz PFM noted | - | - | 3MHz forced PWM | 3MHz forced PWM — mode/freq differ |
Application & sourcing insights
Questions & answers
ETA3409S2F and ETA3448S2F look closest from catalog data, but both need pinout and circuit validation.