Obsolete — sourcing for existing BOM lines
The 1.5SMC150C is listed as Obsolete by Littelfuse. This means the manufacturer has discontinued production and no longer accepts new orders for this part number. For designs already using this TVS, sourcing is limited to surplus and broker channels.
Clamping and breakdown — what the ratings mean for circuit protection
Reverse standoff voltage is 128V typical, meaning the diode remains non-conductive below this DC or peak AC voltage. Bidirectional single-channel configuration — both polarities are clamped symmetrically, so the part protects AC signal lines or DC rails where the transient polarity is unknown.
Housed in a DO-214AB (SMC) surface-mount package, also referred to as SMCJ in supplier documentation. The footprint is standard for this package class — the cathode band is marked on the body for orientation. Operating junction temperature range is -55°C to +150°C, covering industrial and automotive ambient conditions. The 1500W pulse rating is derated at elevated temperatures per the standard TVS derating curve.