Analog Devices Inc./Maxim Integrated DS2401A+T&R

The DS2401A is a 1-Wire identification device with a 64-bit ROM: an 8-bit family code, a factory-assigned 48-bit serial number and an 8-bit CRC. A host reads the identity over a single data lead plus ground. The data line supplies the device during communication, removing the need for a separate supply pin. The DS2401A+T&R order code specifies a three-lead TO-92 with formed leads and tape-and-reel delivery.

The database records TO-226-3, TO-92-3 (TO-226AA). Analog Devices lists the exact DS2401A+T&R order code as a three-lead TO-92 with formed leads. The package registry has separate TO-226-3 and TO-92-3 alias entries; this detail uses its TO-92-3 designation to match the manufacturer naming. Verify the formed-lead spacing against the manufacturer's mechanical drawing.

Assembly checks

• Confirm formed-lead spacing for the tape-and-reel option.
• Follow the manufacturer's TO-92 bottom-view pin drawing.
• Do not interchange this package with TSOC or SOT-223 variants.

The local TO-92-3.jpg file is absent and the production image URL returns HTTP 404. Keep this page unpublished until the registered illustration is online.

For the manufacturer's three-pin TO-92 variant, confirm orientation using the bottom-view diagram.

The package drawing and board view must be aligned before interpreting left-to-right pin order.

Observe the datasheet's bus pull-up, reset, timing and voltage conditions in the final circuit.

Do not treat DS2401A, DS2401, DS2400 or different package suffixes as automatic drop-ins. The A variant does not respond to legacy Read ROM 0Fh and has different responses to Match ROM and Skip ROM. Verify host software, multidrop behavior, pinout and formed-lead footprint. No unverified internal replacement link is provided.

Manufacturer: Analog Devices (Maxim Integrated product family). The current DS2401 datasheet lists DS2401A+T&R as an industrial-temperature, formed-lead three-pin TO-92 variant. Use the manufacturer's current datasheet and package drawing as the controlling design documents.

Confirm the exact DS2401A order code, TO-92 package and lead form. Read and CRC-check the 64-bit ROM during incoming inspection if identity integrity matters; maintain traceability between the physical unit and system records.

Verify 1-Wire bus pull-up and timing, command handling for the A variant, TO-92 lead orientation and assembly footprint. The production package JPG is unavailable; do not publish this product detail until the correct image is accessible and reviewed.