ProjectsPricingInsights

Best Alternatives to SY8291ABC

Package: SOT23-6silergyPower Management (PMIC)Input Voltage Range: 5 V to 40 VOutput Current (Max): 1.2 ASwitching Frequency: 800 kHzTopology: Buck (Step-Down)Internal Switch: Yes (N-Channel FET)

SY8291ABC is a 40V, 1.2A asynchronous step-down DC-DC converter from Silergy in a SOT23-6 package. While no drop-in replacements are confirmed, several functional alternatives exist that require careful review and circuit modifications.

AI replacement insight

Electrical riskhigh

Lower current, different frequency, and different feedback voltage require circuit redesign and validation.

Package risklow

All promising candidates share the same SOT23-6 package, but pinout must be verified.

Can it be replaced directly?

Direct replacement for SY8291ABC should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

Consider ME3116AM6G or LGS5145 if a 1A output current is acceptable. Both are asynchronous buck converters but require external component changes.

Main risk

The primary risk is the lower output current (1A vs. 1.2A) of most alternatives, which could cause performance issues or failure in applications requiring the full 1.2A.

Recommended alternatives

3
LGS5145 package
LGS5145

Legend-Si

Needs validationhigh risk

Functional alternative with wider voltage range, but lower output current and different switching frequency.

View details

Alternative comparison matrix

Feature / factorSY8291ABCLGS5145ME3116AM6GJW5026Compatibility / risk
PackageSOT23-6SOT23-6SOT23-6SOT23-6SOT23-6 — Package matches.; ME3116AM6G: Package matches.; JW5026: Package matches.
TopologyAsynchronous BuckAsynchronous BuckAsynchronous BuckSynchronous BuckAsynchronous Buck / Synchronous Buck — Topology matches target.; ME3116AM6G: Topology matches target.; JW5026: Different topology requires circuit changes (no external diode).
Voltage5V - 40V4.5V - 55V4.75V - 40V4.7V - 40V4.5V - 55V / 4.75V - 40V / 4.7V - 40V — Wider input voltage range is compatible.; ME3116AM6G: Input voltage range is compatible.; JW5026: Input voltage range is compatible.
Current1.2A1A1A1A1A — Lower output current is a downgrade risk.; ME3116AM6G: Lower output current is a downgrade risk.; JW5026: Lower output current is a downgrade risk.
Frequency800 kHz1.2 MHz550 kHz1.1 MHz1.2 MHz / 550 kHz / 1.1 MHz — Requires recalculation of external components.; ME3116AM6G: Requires recalculation of external components.; JW5026: Requires recalculation of external components.

Application & sourcing insights

Questions & answers

Verified drop-in options for SY8291ABC 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.