There is a package TO-261-4, TO-261AA containing the ICs.The package Tape & Reel (TR) contains integrated circuit.Mounting is done using the Surface Mount method.Silicon Serial Number is the type of the integrated circuit system.The family DS2401 contains similar integrated circuit systems.In the case of PCB, Network Node, Equipment Identification/Registration, it is appropriate for the ICs to be applied there.3 pins are available on the ICs applications.Packaged by SOT-223-3, the ICs complete is in good condition.