Analog Devices Inc./Maxim Integrated DS28E38G+T

The DS28E38 provides public-key challenge-response authentication for peripherals, consumables and connected nodes. ChipDNA generates a device-unique PUF response used to protect stored data and, if configured, the ECDSA private key. A host communicates through the single-contact 1-Wire bus using the factory-programmed 64-bit ROM ID for device identification.

• FIPS 186-compliant ECDSA P-256 challenge-response signing.
• ChipDNA PUF-derived secret protection and optional private-key use.
• FIPS/NIST-compatible hardware true random number generator.
• 2 Kbits secured EEPROM for user data, keys, control and certificate information.
• 17-bit nonvolatile decrement-only counter with authenticated read.
• Unique factory 64-bit ROM ID and standard/overdrive 1-Wire modes.
• Active die shield and encrypted protection of stored data.

The customer database lists 2-WDFN and the package registry maps that label to /upload/package/2-WDFN.jpg. The exact manufacturer ordering table assigns DS28E38G+T to a 2-pad SFN, 3.5 x 6.5 x 0.75 mm package, code T23A6N+1, outline 21-0575. This is a substantive footprint conflict; retain the original database value only as an unverified record.

Package checks

• Match the physical part to the two-pad SFN drawing and pad orientation.
• Do not substitute a 2-WDFN land pattern without manufacturer confirmation.
• Do not add a separate CEXT pad to the G-version contact package.

The local 2-WDFN JPG is absent; its production URL returns HTTP 404. Publication is blocked.

Analog Devices' SFN top-view drawing for the G version has only two contact pads:

The Q variant instead uses a six-pin TDFN-EP with an external CEXT pin; that pinout does not apply here.

Timing and security behavior depend on the manufacturer's detailed protocol and stated test conditions.

Do not treat DS28E38Q+T as a drop-in mechanical substitute: its six-pin TDFN-EP package and CEXT connection differ from the two-pad G-version SFN. Any replacement must match the host's 1-Wire command handling, trust anchor, provisioned identity and physical contacts. No unverified LCDChip replacement link is provided.

Analog Devices' DS28E38 Rev. 3 datasheet (February 2025) and official product page identify the exact DS28E38G+T order code as a 2-pad SFN part. The + denotes the lead-free/RoHS package notation and T denotes tape and reel. The official documentation does not support the database's 2-WDFN label for this G variant.

Verify the G+T order code, reel label, two-pad SFN geometry and lot traceability. The ROM ID and successful authenticated challenge-response should be checked in the intended host environment; a generic package label alone does not establish authenticity.

Resolve the catalog 2-WDFN versus manufacturer two-pad SFN conflict against an actual device label and official package drawing before release. The required production 2-WDFN JPG returns HTTP 404. Keep this detail in review with isRed=0; do not publish or use the displayed generic image as mechanical evidence.