Silicon Serial Number

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Status Explanations for product status codes

Part Number Status
DS2401 Active: In Production. See Ordering Information for details.


The DS2401 enhanced Silicon Serial Number is a low-cost, electronic registration number that provides an absolutely unique identity which can be determined with a minimal electronic interface (typically, a single port pin of a microcontroller). The DS2401 consists of a factory-lasered, 64-bit ROM that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit Family Code (01h). Data is transferred serially via the 1-Wire® protocol that requires only a single data lead and a ground return. Power for reading and writing the device is derived from the data line itself with no need for an external power source. The DS2401 is an upgrade to the DS2400. The DS2401 is fully reverse-compatible with the DS2400 but provides the additional multi-drop capability that enables many devices to reside on a single data line. The familiar TO-92, SOT-223 or TSOC package provides a compact enclosure that allows standard assembly equipment to handle the device easily.

Data Sheet

Download this datasheet in PDF formatDownload Rev 3 (PDF, 336kB)
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An evaluation board is available: DS9120, DS9120P, DS9120Q

Key Features

  • Upgrade and Drop-In Replacement for DS2400
    • Extended 2.8 to 6.0 Voltage Range
    • Multiple DS2401s Can Reside on a Common 1-Wire Net
  • Unique, Factory-Lasered and Tested 64-Bit Registration Number (8-Bit Family Code + 48-Bit Serial Number + 8-Bit CRC Tester); Guaranteed No Two Parts Alike
  • Built-In Multidrop Controller Ensures Compatibility with Other 1-Wire Net Products
  • 8-Bit Family Code Specifies DS2401 Communications Requirements to Reader
  • Presence Pulse Acknowledges When the Reader First Applies Voltage
  • Low-Cost TO-92, SOT-223, and TSOC Surface Mount Packages
  • Reduces Control, Address, Data, and Power to a Single Pin
  • Zero Standby Power Required
  • Directly Connects to a Single Port Pin of a Microprocessor and Communicates at Up to 16.3kbps
  • TO-92 Tape & Reel Version with Leads Bent to 100mil Spacing (Default) or with Straight Leads (DS2401T-SL)
  • -40°C to +85°C Industrial Temperature Range


  • Equipment Registration
  • Network-Node Identification
  • PCB Identification
  • Reference Design License Management

Key Specifications:

Part Number Memory Type Memory Size Bus Type Real Time Clock Pwr. Cap Pckg. GPIO VSUPPLY
min max See Notes
DS2401  ROM 64bit x 1 1-Wire No No No 2.8 6 $0.62 @1k
See All Memory (EPROM, EEPROM, ROM, NV SRAM) (66)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


DS2401: Pin Assignment
Pin Assignment

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Information Index

Document Ref.: 19-5860 Rev 3; 2011-05-19
This page last modified: 2011-05-19