S1C12000XWFAC
JYJE
Needs validationmedium risk
S1C12000XWFAC is a same-package 12MHz crystal with a load-capacitance caveat.
Best Alternatives to X49SD12MSD2SC
X49SD12MSD2SC is a 12MHz 20pF HC-49US crystal. Alternatives must match frequency, load capacitance, package, and oscillator drive limits.
AI replacement insight
Electrical riskmedium
18pF vs 20pF may need capacitor changes
Package risklow
HC-49US and 2 pins match
Firmware risklow
same nominal 12MHz for kept part
Sourcing riskmedium
candidate lifecycle is not stated
Can it be replaced directly?
Direct replacement for X49SD12MSD2SC should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
Use S1C12000XWFAC only after checking 18pF load capacitance impact and pinout.
Main risk
Load capacitance mismatch can shift the oscillator frequency.
Recommended alternatives
1Alternative comparison matrix
| Feature / factor | X49SD12MSD2SC | S1C12000XWFAC | Alt 2 | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | HC-49US | HC-49US | HC-49US — same package | ||
| Pinout | 2 pins | 2 pins | 2 pins — pinout not verified | ||
| Tolerance | ±20ppm | ±20ppm | ±20ppm — same initial tolerance | ||
| Temperature | -20°C to +70°C | -20°C to 70°C | -20°C to 70°C — same range | ||
| Application | 12MHz 20pF crystal | 12MHz 18pF crystal | 12MHz 18pF crystal — retune caps may be needed |
Application & sourcing insights
Questions & answers
Verified drop-in options for X49SD12MSD2SC 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.