What the voltage ratings mean for the circuit
The 1.5KE16CAHE3/51: This means a 12 V nominal rail with transients up to 22.5 V is within the protection envelope.
The DO-201AA (DO-27) axial-lead package is through-hole mounted, which provides a lower thermal resistance path to the PCB than surface-mount alternatives.
Obsolete — sourcing through independent channels
Vishay has marked the 1.5KE16CAHE3/51 as obsolete.
