Microchip Technology ATSHA204-MAH-CZ-T

The device supports host and client authentication using a hardware SHA-256 engine, internal nonvolatile key storage and a unique serial number. It is intended for designs that need device identity and anti-clone checks without exposing secret keys to the host processor.

The catalog records 8-UFDFN Exposed Pad. Microchip's original ATSHA204 ordering table identifies ATSHA204-MAH-CZ-T as an 8-pad UDFN, tape-and-reel, single-wire variant. The manufacturer drawing identifies an 8MA2, 2 × 3 × 0.6 mm thermally enhanced body. Its UDFN option is marked obsolete in that datasheet.

Microchip's 8-pad UDFN pinout assigns the following connections. Verify the package orientation and land pattern against the controlled drawing.

The manufacturer identifies ATSHA204A as the successor family, but a name similarity is not proof of drop-in compatibility. Review command behavior, key provisioning, lock states, firmware, electrical timing, single-wire interface, package and pinout before changing a design. No unverified internal product link or unconditional replacement claim is provided.

The Microchip/Atmel ATSHA204 datasheet, Atmel-8740H provides the exact ordering code, electrical limits, 8-pad UDFN drawing and lifecycle notes. Use it for the original ATSHA204; do not substitute ATSHA204A specifications without verification.

Verify the complete order code from traceable shipment documentation and lot information. The manufacturer's datasheet notes that the full part number does not appear on the package marking, so marking alone is insufficient for incoming identification. Check the programmed configuration and key-provisioning record before use.

The original ATSHA204 datasheet marks the UDFN option obsolete and the device not recommended for new designs. Confirm lifecycle and traceability, command and provisioning compatibility, power and timing limits, exact 8-pad footprint and exposed-pad treatment before production. The production package JPG must be checked before publication.