Analog Devices Inc./Maxim Integrated DS2477Q+U

DS2477 combines an I2C host interface, a hardware SHA3-256 engine, a ChipDNA physically unclonable function, a true random number generator, secured EEPROM, and a 1-Wire master. The host can use the coprocessor for challenge-response authentication with compatible 1-Wire secure devices while the internal master generates time-critical 1-Wire waveforms. A unique factory-programmed 64-bit ROM identifier provides a device identity used in cryptographic operations.

The LCDChip record names 6-WDFN Exposed Pad. Analog Devices / Maxim describes DS2477 in a 3 mm × 3 mm six-pin TDFN-EP package; its data sheet identifies package code T633+2, outline 21-0137, and land pattern 90-0058. These naming conventions should be reconciled against the exact manufacturer's mechanical drawing rather than assumed interchangeable from a generic package label.

Assembly checks

• Confirm the top-view pin-1 mark and 3 mm × 3 mm outline.
• Solder the exposed pad evenly to the ground plane as the manufacturer specifies.
• Use the current official land-pattern and reflow guidance.

The registered package JPG is currently unavailable on the production website. Use the manufacturer's controlled drawing for mechanical qualification.

The official DS2477 six-pin TDFN-EP top-view diagram assigns:

Electrical and timing limits depend on the conditions and notes in the current manufacturer data sheet; use that document for sign-off.

Do not substitute a different secure element solely because it has an I2C interface or a 1-Wire port. Verify the exact authentication algorithm, key storage and provisioning, ChipDNA behavior, 1-Wire master commands and timing, power requirements, I2C address, pinout, exposed-pad layout, and qualification status. The manufacturer's product page lists both DS2477Q+U and DS2477Q+T, but shipment and ordering suffixes require a direct ordering-code check. No unverified LCDChip alternative-product link is asserted here.

Analog Devices lists DS2477Q+U as a production model in the Maxim Integrated DS2477 family. Consult its current DS2477 product page, Rev. 2 data sheet, Security User Guide, and package documents for controlled technical and ordering details.

Inspect the full ordering code, package marking, lot traceability, exposed-pad condition, and applicable manufacturer documentation. Cryptographic authentication requires controlled secret provisioning and implementation review; a device label or generic package photograph alone is not proof of authenticity.

Validate the I2C pull-ups, GPIO connection, 1-Wire pullup and power-delivery configuration, supply decoupling, software command sequence, cryptographic provisioning, exposed-pad grounding, and package land pattern with current Analog Devices documentation. The registered package JPG is absent from the production site and must be supplied and visually checked before publication.