Analog Devices Inc./Maxim Integrated DS28E40G/V+

DS28E40 is a single-contact 1-Wire secure authenticator intended to help a host verify a connected automotive part, tool, accessory or IoT node. It supports ECDSA P-256 signatures and verification, ECDH key exchange, SHA-256-based authentication and protected data operations. Its 64-bit factory ROM identifier can participate in cryptographic workflows.

• ECC-P256 ECDSA signature generation and verification.
• ECDH key exchange and authenticated read/write functions.
• SHA-256 HMAC and encrypted configurable-memory transactions.
• NIST SP 800-90B-compatible entropy source for the true random number generator.
• 6Kb OTP memory and unique 64-bit factory ROM ID.
• Authenticated or ordinary GPIO control, depending on configuration.
• Standard and overdrive 1-Wire speeds.

The database records 10-WFDFN Exposed Pad and the registry maps it to /upload/package/10-WFDFN-Exposed-Pad.jpg. The manufacturer calls the G/V family package 10-pin 4 x 3 mm TDFN-EP, code T1034+2. The generic WFDFN label does not establish an exact footprint: verify outline 21-0268 and land pattern 90-0247 before PCB use.

Layout checks

• Confirm 4 x 3 mm body and pin-1 orientation against T1034+2.
• Solder the exposed pad evenly to the board ground plane.
• Use the manufacturer's recommended land pattern and external CEXT capacitor placement.

The local package JPG is absent and the production URL returns HTTP 404. Keep this page unpublished.

Original DS28E40 TDFN-EP top-view assignments:

Consult the manufacturer's electrical-characteristics table for timing, loading and guaranteed limits.

A secure authenticator is not interchangeable solely by pin count. Verify the 1-Wire command set, provisioned keys, host trust anchor, GPIO policy, OTP contents and exact TDFN land pattern. No unverified LCDChip replacement link is provided.

The Maxim Integrated DS28E40 datasheet, hosted by Analog Devices, documents the DS28E40G/V+T 10-pin TDFN-EP ordering code; T identifies tape-and-reel packaging and /V denotes automotive qualification. An official Analog Devices evaluation-board schematic labels a device DS28E40G/V+ without the T reel suffix. This supports the device identity but does not independently establish a separately orderable non-reel SKU.

Check the complete device marking, G/V package code, reel or sample documentation, lot traceability and the 64-bit ROM identifier. Cryptographic personalization and key ownership must be verified separately from physical authenticity.

Use the manufacturer DS28E40 datasheet and official evaluation-board schematic for technical verification. Confirm whether this record's G/V+ code is a device-only marking or a separately orderable code, and reconcile the generic WFDFN name with the T1034+2 drawing. The required production package JPG is missing (HTTP 404). Retain review and isRed=0; do not publish until ordering identity, footprint and image are verified.