250 V Vceo — the high-voltage workhorse in a TO-39 can
That 250 V ceiling puts it in the high-voltage linear and switching class — think line-voltage relay drivers, solenoid kickers, linear regulator pass elements, and CRT deflection circuits. The metal can gives better thermal conduction and hermeticity than a plastic TO-92, so it holds up in industrial panels or gear that sees vibration and temperature swings.
No last-time-buy clock ticking, no forced redesign for a production BOM. ROHS3 compliant out of the bag.
Through-hole mounting and the TO-39 footprint
Through-hole mounting in a TO-205AD / TO-39-3 metal can — the three-lead, round-can footprint that has been a standard for decades. The metal tab is the collector, so if you are heatsinking, keep that in mind for the board layout. Bag packaging, so it arrives loose; no reel or tube to worry about for small-batch builds.