LGS5145
Legend-Si
Needs validationmedium risk
LGS5145 is a close buck-function candidate but not a proven pin-compatible replacement.
Best Alternatives to JW5026
JW5026 is a 40V/1A synchronous buck regulator. Listed alternatives require FAE review because pinout evidence is missing.
AI replacement insight
Electrical riskhigh
VIN, current, topology, or temp differ.
Package riskmedium
SOT23-6 matches but pinout is unknown.
Firmware risklow
No digital firmware interface shown.
Sourcing riskmedium
Lifecycle and availability need check.
Can it be replaced directly?
Direct replacement for JW5026 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
Review LGS5145 first for close voltage/current fit, then verify pinout and external BOM.
Main risk
Unknown pinout and DC-DC loop/BOM differences.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | JW5026 | LGS5145 | DIO61845ST6 | RY9121 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT23-6 | SOT23-6 | SOT23-6 | SOT23-6 | SOT23-6 — same body; DIO61845ST6: same body; RY9121: same body; RY9125: same body |
| Pinout | 6 pins | 6 pins | 6 pins | 6 pins | 6 pins — functions missing; DIO61845ST6: functions missing; RY9121: functions missing; RY9125: functions missing |
| Voltage | 4.7-40V | 4.5-55V | 5-40V | 4.5-17V | 4.5-55V / 5-40V / 4.5-17V — range covers; DIO61845ST6: higher VIN min; RY9121: not 40V rated; RY9125: not 40V rated |
| Current | 1A | 1A | 0.6A | 2A | 1A / 0.6A / 2A — same rating; DIO61845ST6: load derating; RY9121: higher load; RY9125: higher load |
| Interface | sync buck | async buck | - | - | async buck — efficiency/BOM change |
| Temperature | -40 to 125C | - | -40 to 85C | -40 to 85C | -40 to 85C — lower max; RY9121: lower max; RY9125: lower max |
Application & sourcing insights
Questions & answers
Verified drop-in options for JW5026 are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.