Analog Devices Inc./Maxim Integrated DS2401AZ+T&R

The DS2401AZ stores a factory-assigned electronic registration number in a 64-bit ROM: an 8-bit family code, 48-bit serial-number field and 8-bit CRC. A host reads it through a 1-Wire data connection and ground. The data line supplies power during communication, so no separate supply pin is needed. The exact +T&R order code denotes tape-and-reel packaging; the AZ package variant is four-terminal SOT-223, called TO-261 in the manufacturer's product listing.

The LCDCHIP product record specifies TO-261-4, TO-261AA. Analog Devices' exact order-code table identifies DS2401AZ+T&R as four-terminal SOT-223, while its product listing calls the same order code a TO261 small-outline transistor package. The package workbook has separate existing TO-261-4 and TO-261AA entries; this detail uses the registered TO-261-4 JPG path. Use the manufacturer's mechanical drawing for the actual footprint and tab orientation.

Layout checks

• Check the SOT-223 / TO-261 outline and tab dimensions.
• Map the ground tab and three leads against the datasheet pin diagram.
• Do not substitute a TO-92 or TSOC footprint.

The local TO-261-4.jpg is absent and the production URL returns HTTP 404. Do not publish this detail until the correct production image is accessible.

The manufacturer lists the following assignments for the SOT-223 package; confirm top-view orientation and the tab before PCB layout.

Design against the complete manufacturer's bus pull-up, reset-pulse and timing specifications.

Do not assume DS2401, DS2401A, DS2400 or other package variants can replace this exact order code without review. The A variant does not support legacy Read ROM 0Fh and has distinct responses to Match ROM and Skip ROM. Check firmware, multidrop behavior, pinout and SOT-223 footprint. No unverified internal substitute link is supplied.

Manufacturer: Analog Devices (Maxim Integrated family). The DS2401 datasheet's ordering table lists DS2401AZ+T&R as an industrial-temperature four-terminal SOT-223 option. Use the current datasheet and official package drawing as design authorities.

Inspect the exact order code, four-terminal package and tab orientation. Read and CRC-check the ROM identity when receiving units, and preserve the association between physical devices and traceability records.

Verify host timing, pull-up selection, A-variant ROM command handling, package orientation and tab connection against Analog Devices documentation. The registered production package JPG is unavailable; keep this page unpublished until the correct resource passes verification.