Analog Devices Inc./Maxim Integrated MAX66250ESA+T

MAX66250 is a passive NFC tag for contactless authentication. A reader communicates over the ISO/IEC 15693 RF interface, while the device protects a 256-bit user EEPROM with a SHA3-256 based challenge-response mechanism. It also provides a unique 64-bit ROM identifier and a one-time-settable, decrement-only counter.

MAX66250ESA+T is specified for the 8-pin SOIC, 150 mil body. LCDChip's registered package name is 8-SOIC. The manufacturer identifies package code S8+2, outline drawing 21-0041 and land pattern 90-0096; use those controlled mechanical documents for production layout.

Layout checks

• Confirm SOIC pin 1 and body orientation before routing the antenna.
• Connect only the AC1 and AC2 antenna pins as specified.
• Keep every DNC pin unconnected as directed by the manufacturer.

The local 8-SOIC JPG is registered; the image is illustrative, not a substitute for the controlled footprint drawing.

The following pin assignment follows the MAX66250 Rev 2 manufacturer's pin-description table for the 8-SOIC device.

The device harvests operating energy from the RF field; AC1 and AC2 are the external antenna interface.

Electrical characteristics are design-conditional; consult the current controlled data sheet for test conditions, limits and RF antenna matching.

The MAX66250ESA+ tube variant uses the same basic authenticator and SOIC outline, but its order packaging differs. Other NFC authenticators must be compared for protocol commands, cryptographic provisioning, key storage, antenna tuning, operating field, temperature and mechanical outline. No alternative is represented here as a confirmed drop-in substitute or linked without an exact catalog match.

Analog Devices, incorporating Maxim Integrated, lists MAX66250ESA+T as an active MAX66250 orderable model. The Rev 2 manufacturer data sheet governs the interface, package, pin assignment and electrical limits summarized here.

On receipt, verify the complete MAX66250ESA+T marking and order code, reel label, supplier traceability, package dimensions and moisture-handling documentation. Security keys and provisioning records require controlled handling; an unprovisioned device does not alone authenticate a system.

Use the latest controlled Analog Devices data sheet and mechanical drawing for final schematic, antenna and PCB release. Validate reader compatibility, RF field strength, key provisioning and authentication timing in the target system. Distributor inventory and pricing require recheck at purchase time.