Silicon serial number for board-level identification
The DS2401Z+ is a silicon serial number IC from Analog Devices, packaged in a SOT-223-3 surface-mount package (TO-261-4 / TO-261AA equivalent). It provides a unique, factory-lasered 64-bit registration number that serves as an electronic identifier for PCB assemblies, network nodes, and equipment needing tamper-proof identification or inventory tracking.
The DS2401Z+ uses the SOT-223-3 footprint (also listed as TO-261-4 / TO-261AA), a three-lead surface-mount package with a large thermal pad on the bottom. The pad is not electrically connected to the die, but it provides mechanical stability during reflow. The package is supplied in tube format. The single-wire communication interface (common to the DS2401 family) operates over a single data line plus ground, with the device drawing its parasitic power from the bus. No external power supply is needed at the IC pin — the bus master provides both data and power through the pull-up resistor.