Peak pulse budget and clamping floor
The 1.5KE56CA A0G: The single bidirectional channel handles symmetrical transients on signal or DC power rails where polarity reversal is possible — no need for two back-to-back unidirectional devices.
Temperature envelope and board integration
The DO-201 (DO-27) axial-lead package requires through-hole mounting; the lead length between the solder joint and the body sets the thermal impedance to the board copper. No power line protection rating (: No) means this TVS is intended for signal or low-side DC rail clamping, not for mains AC or high-energy surge suppression where a dedicated MOV or gas tube would be specified.
Sourcing and compliance posture
The base product number 1.5KE56 covers the voltage family; the 'CA' suffix marks the bidirectional polarity, 'A0G' the tape-and-box packaging.