Lifecycle score 29/100 (at_risk).
Status: obsolete
onsemi's official product page marks all BS170 variants as Obsolete with notation "These devices are not available." Last-time-buy confirmed at 12/11/2009 via OnlineComponents. No datasheet updates since September 2017 (Rev. 5, a ~9-year gap) and no active errata or PCNs detected, confirming obsolescence. Residual stock remains at DigiKey and other major distributors, though onsemi inventory is depleted. Diodes Inc. BS170F serves as an active surface-mount successor.