Obsolete – sourcing window is closing
The 1.5KE120CARL4 is listed as Obsolete by onsemi. That means no ongoing production – any available stock is the last of it. If your BOM still calls this exact code, the window to secure inventory is narrowing.
Bulk packaging for bench or small-batch use
That makes it practical for calibration labs, repair benches, or hobbyist builds where you only need a handful of units and don't want to commit to a full reel. No pick-and-place reel, but easy to hand-solder or socket.
