The 1.5KE47A: Its 40.2 V reverse standoff voltage protects 36 V or 48 V DC rails — the diode stays off below that threshold and starts conducting when the transient exceeds it. That means a transient that would otherwise hit 80-100 V on the rail gets clipped to under 65 V, keeping downstream semiconductors inside their safe operating area.
Breakdown window and temperature range
Minimum breakdown voltage is 44.7 V, so the diode guarantees it starts clamping before the rail reaches 45 V. The single unidirectional channel handles one polarity of transient per device.
Through-hole axial package — field-swappable
Housed in a DO-201AA / DO-27 axial-lead package (supplier device package DO-201), this is a through-hole part. The leads are long enough to bend into existing PCB holes or terminal blocks, and it can be swapped on site with a standard soldering iron — no hot-air station needed.
Active production — sourcing reality
Littelfuse lists the 1.5KE47A as Active in production. No stock-holding claim — each order is quoted per the BOM quantity.