The 1.5SMC47 is listed as Obsolete by Littelfuse. Sourced through independent distribution; quantities are lot-specific and confirmed at RFQ.
Key ratings and what they mean for the BOM
The clamping voltage at that peak current is 68.04 V, so a 40.2 V standoff rail sees the line held to under 68 V during a transient. Breakdown voltage is 42.35 V minimum — the diode starts conducting between 42.35 V and the clamping ceiling. Unidirectional (one channel), so it protects a single DC rail against positive transients to ground.
DO-214AB (SMC) surface-mount package — the same footprint as the SMCJ series. The copper pad area under the cathode tab sets the thermal resistance; a full pad with thermal vias to the ground plane improves surge current handling. Supplied in Tape & Reel — compatible with automated pick-and-place assembly. No power line protection (not intended for AC mains clamping); use for DC rail transient suppression in general-purpose electronics.