P-channel MOSFET — what the class tells you about the load switch
The 2SJ387L-E is a P-channel power MOSFET, the device class used for high-side load switching where the source connects to the positive rail and the drain drives the load — no charge pump needed for gate drive above the supply, which simplifies the driver circuit in battery-powered and low-voltage systems.
Bulk packaging — engineering samples and low-volume builds
The 2SJ387L-E is, not Tape & Reel. That typically means the part ships in tubes or trays — suitable for prototyping, pre-production, or repair stock, but a production line expecting reel-fed pick-and-place should confirm the handling method with the distributor at quote time.