Analog Devices Inc./Maxim Integrated DS2401

DS2401 is a silicon serial-number device, not a general-purpose EEPROM. Its factory-lasered 64-bit ROM comprises an 8-bit family code (01h), a 48-bit unique serial field, and an 8-bit CRC. A controller reads the identifier through the 1-Wire interface, which carries communication and parasitic operating power on the data conductor.

The LCDChip registered package is TO-226-3, TO-92-3 (TO-226AA). The manufacturer's current table identifies the DS2401+ family variant as a three-pin TO-92 device. Use the controlled outline to distinguish front/bottom pin views, lead forming, and spacing before adopting a land pattern.

Layout checks

• Verify the manufacturer pin-view orientation.
• Provide the specified 1-Wire pull-up and account for network loading.
• Confirm lead geometry and exact purchased ordering code.

The expected local JPG is absent and the production package URL returns HTTP 404. Keep this draft unpublished until the correct image is restored and visually checked.

The manufacturer DS2401 TO-92 pin-description table assigns:

Confirm pin numbering against the selected TO-92 package drawing and actual board viewing direction.

These DS2401-family values are from the controlled data sheet, not a guarantee for an unidentified physical lot. Check exact-order-code conditions and network timing before design release.

Current manufacturer literature lists DS2401+ in TO-92, DS2401+T&R with formed leads, DS2401-SL+T&R with straight leads, and DS2401P+ in a six-pin TSOC. Their assembly geometry and ordering/compliance suffixes differ. DS2401A variants have different electrical limits and command behavior; they are not assumed interchangeable. Validate bus voltage, pull-up, search/read behavior, package drawing, and supply provenance. No unverified internal product link is added.

Analog Devices publishes the DS2401 Silicon Serial Number data sheet, revision 12/23. Its ROM format, 1-Wire transaction sequence, TO-92 pin descriptions, electrical table, and current ordering information inform this detail. The unsuffixed catalog record requires human confirmation against the manufacturer's current saleable ordering code and the actual inventory lot.

Verify the full supplied part marking, lead finish, package outline, lot documentation, and 64-bit ROM readout. CRC checks data integrity but does not make this serial-number ROM a cryptographic authenticator. Confirm uniqueness and provenance through the sourcing and production process rather than treating the catalog name alone as proof.

Review the latest manufacturer data sheet for reset/presence timing, bus pull-up sizing, parasitic-power margins, ROM commands, and exact package orientation. Resolve the unsuffixed ordering-code identity and restore the registered package JPG before any formal publication. This device supplies an identifier, not secure cryptographic authentication.