What the clamping numbers mean for your rail
The SMCJ16CA-13: The reverse standoff voltage of 16 V means the device does not conduct at normal operating levels up to that voltage, so it sits across the supply without affecting the circuit under steady-state conditions. That 26 V clamp is what the downstream silicon actually sees — a 16 V rail getting punched to 26 V for a few microseconds is within the absolute-maximum ratings of most 20 V-rated ICs, which is the whole point of the part.
Peak pulse power and package reality
Rated at 1500 W peak pulse power, this TVS handles the energy from a typical industrial surge or lightning-induced transient on a 16 V bus. The DO-214AB (SMC) package is the standard surface-mount footprint for this power class — the large copper tab on the bottom side pulls heat into the board copper, so the PCB layout's pad area directly affects how much repetitive surge energy the part can absorb before the junction temperature climbs.
Active lifecycle and sourcing posture
That means it is safe to specify into new designs without worrying about a sudden discontinuation. The base product number is SMCJ16, so the -13 suffix indicates the tape-and-reel packaging variant, which is the standard feed for automated pick-and-place assembly.