Analog Devices Inc./Maxim Integrated DS28E30X+U

DS28E30 provides asymmetric authentication for compatible hosts over a single-contact 1-Wire bus. A preprogrammed, write-protected ECC P-256 key pair, ECDSA signature engine, true random number generator, secured EEPROM, unique 64-bit ROM ID, and authenticated decrement-only counter support identity and usage-control applications. The X+U ordering model is listed by Analog Devices as a WLCSP option, corresponding to the manufacturer's four-bump WLP pin configuration.

The site product record specifies 4-XFBGA, WLBGA, and the package registry maps that record to the name 4-XFBGA. Analog Devices lists DS28E30X+U as WLCSP; the Rev. 3 data sheet shows a four-bump WLP. Treat these names as a documentation cross-check, not as proof that a generic 4-XFBGA land pattern is mechanically interchangeable. Obtain the exact manufacturer WLCSP dimensions and assembly drawing for the X+U option.

Assembly checks

• Verify A1/B1/A2/B2 bump coordinates from the manufacturer's top-view drawing.
• Confirm wafer-level bump pitch, orientation, and PCB pad geometry.
• Place the required external capacitors close to CEXT1 and CEXT2.

The registered package JPG is unavailable on the production website. Use the controlled Analog Devices package drawing; do not use a generic picture for assembly qualification.

The manufacturer's four-bump WLP pin-description table assigns:

The six-pin TSOC pinout is different and does not apply to DS28E30X+U.

Use the current data sheet's electrical test conditions, capacitor values, 1-Wire timing, and absolute ratings for engineering sign-off.

Any replacement must match ECDSA and certificate trust behavior, ROM and command protocol, protected-memory layout, counter semantics, 1-Wire voltage and timing, external-capacitor network, temperature range, and exact four-bump geometry. A six-pin TSOC option or a different secure authenticator is not an unconditional footprint or firmware replacement. No unverified LCDChip alternative-product link is asserted here.

Analog Devices lists DS28E30X+U on its DS28E30 product page as a WLCSP model. Refer to the current Rev. 3 data sheet, Security User Guide, exact package drawing, and manufacturer notices for controlled technical information and qualification.

Verify the complete DS28E30X+U code, wafer-level marking or lot traceability, packaging, bump integrity, and official manufacturer notices. A cryptographic authenticity check requires certificate validation, secure host behavior, and suitable handling of failed or replayed responses.

Validate the exact WLCSP bump map and land pattern, CEXT1/CEXT2 capacitor values, 1-Wire power and strong-pullup timing, certificate trust chain, protected key handling, and firmware responses to authentication failures. The registered 4-XFBGA JPG currently returns 404 on the production site, and the site package naming must be reconciled with the manufacturer's WLCSP drawing before publication.