The 1.5SMBJ36A: That power rating defines how much transient energy it can clamp before the junction exceeds its thermal limit — for a 36 V rail, a 25.9 A peak pulse current (Ipp) at the 58.1 V clamping voltage gives the energy budget for a typical surge event. The 36 V reverse standoff voltage (VRWM) means the diode does not conduct at normal rail voltage up to 36 V; it starts breaking down at 40 V minimum and clamps the transient to 58.1 V maximum. This window protects downstream components rated for at least 60 V on a 36 V bus.
Housed in the DO-214AA (SMB) surface-mount package, the 1.5SMBJ36A occupies a standard footprint that mates with common SMB land patterns.