Analog Devices Inc./Maxim Integrated DS28C40ATB/VY+T

DS28C40 supplies hardware ECC-P256 ECDSA, ECDH and SHA-256/HMAC functions for bidirectional authentication of automotive components and accessories. It includes secured one-time-programmable memory, a true random-number generator, one configurable GPIO and a unique 64-bit ROM identifier. A host processor uses I2C for commands and credential management.

The customer product record and package registry name is 10-WFDFN Exposed Pad. The manufacturer lists DS28C40ATB/VY+T as a 10-pin, 3 mm × 3 mm side-wettable TDFN-EP with package code T1033Y+2. Check the controlled drawing and matching land pattern for this code, not the 3 mm × 4 mm T1034+2 variant.

Layout checks

• Verify the exact side-wettable outline and top-view pin-1 location.
• Keep DNC pins unconnected.
• Solder the exposed pad evenly to the ground plane.
• Add appropriate I2C pull-up resistors and supply decoupling.

The expected production package JPG is missing. Supply and visually verify it before publication.

Manufacturer top-view pin description for the 10-pin TDFN-EP:

Pin names and numbers follow the manufacturer's DS28C40 Rev. 1 data sheet; verify the final footprint against its package drawing.

Confirm programming-temperature and I2C timing restrictions in the controlled data sheet. Typical figures and absolute-maximum ratings are not guaranteed operating limits.

DS28C40G/V+T is a family member, but its 3 mm × 4 mm TDFN footprint differs from the 3 mm × 3 mm side-wettable ATB/VY+T order code. Compare the complete part number, mechanical outline, automotive qualification, electrical limits, firmware, credential provisioning and security features before considering any substitute. No unverified internal replacement link is provided.

Analog Devices publishes DS28C40 under the Maxim Integrated DeepCover portfolio. The manufacturer's Rev. 1 data sheet lists the exact DS28C40ATB/VY+T order code and separates the two TDFN package options. Use current controlled documents and qualification notices for design release.

Verify complete order code, package marking, lot traceability and manufacturer qualification evidence. Security assurance depends on host validation, key management and the complete system; the IC alone does not certify an application.

Verify the current manufacturer data sheet, exact ATB/VY+T package drawing, I2C timing, OTP programming conditions and security user guide before production. The referenced production JPG is unavailable; keep this detail unpublished until it is present and visually verified.