The Littelfuse 1.5SMC51 is a Zener-type transient voltage suppressor (TVS) diode from the 1.5SMC series, designed for general-purpose circuit protection against voltage transients. These ratings define the protection envelope: the circuit rail must stay below 43.6V during normal operation, and the TVS clamps transients to 73.61V, preventing downstream components from seeing overvoltage. The DO-214AB (SMC) package supports standard surface-mount reflow assembly and is also known as the SMCJ footprint.
Lifecycle reality — obsolete, sourced per RFQ
Littelfuse lists the 1.5SMC51 as Obsolete. This means the manufacturer has discontinued production and no longer accepts new orders. For BOM lines that require this exact order code, sourcing runs through independent distribution channels. Availability is lot-specific and confirmed at quote time against the RFQ quantity. No stock-holding claim is made; each request is sourced on demand.