48 V standoff, 77.4 V clamp — protection window for 24 V and 48 V rails
The 1.5SMCJ48AS_R1_00001: The clamping voltage — not the standoff — is what the protected circuit actually sees during a transient. With a 77.4 V ceiling at 19.4 A peak, downstream semiconductors on a 48 V rail have headroom above their maximum ratings during a surge event. This part is classified as not providing power-line protection, so it sits on signal or low-power control lines, not on the mains bus — a 24 VDC sensor bus or PLC input channel is the natural fit. General-purpose application rating covers a wide range of industrial and instrumentation roles.
The 1.5SMCJ48AS_R1_00001 is listed Active by Panjit International Inc.. Available in Tape & Reel and Cut Tape packaging for production and rework flows.