Analog Devices Inc./Maxim Integrated MAX66242ESA+T

The MAX66242 is a dual-interface secure authenticator for contactless identification and wired host access. A 64-bit factory-programmed ROM ID, protected user EEPROM and a hardware SHA-256 engine support authenticated memory transactions. The device can harvest energy from a suitable RF field or operate with an external VCC supply. The I2C interface adds host communication that the RF-only MAX66240 does not provide.

The manufacturer's ordering table specifies MAX66242ESA+T as an 8-pin, 150-mil SO package with package code S8+2 and 2,500-piece tape-and-reel delivery. LCDChip registers the package as 8-SOIC (0.154", 3.90 mm width). Use the manufacturer's controlled outline 21-0041 and land pattern 90-0096 for PCB release.

Layout checks

• Check pin-one orientation against the manufacturer's SOIC top view.
• Match AC1 and AC2 to the intended antenna network.
• Route VCC, VOUT, PIO and I2C signals according to the selected operating mode.

The generic package JPG shows the package shape, not the device-specific pinout.

The 8-pin SOIC top-view assignment is 1 VCC (external supply), 2 AC2 and 3 AC1 (antenna), 4 GND, 5 VOUT (harvested output), 6 PIO (multipurpose open-drain output), 7 SCL (I2C clock), and 8 SDA (bidirectional I2C data). This is not pin-compatible with the RF-only MAX66240 SOIC.

Electrical limits and harvested power depend on the manufacturer's test conditions; refer to the controlled data sheet.

An 8-pin SOIC secure authenticator is not automatically interchangeable. Compare RF timing, I2C roles and voltage, antenna network, ROM-ID behavior, secret provisioning, EEPROM protection, PIO/VOUT use, temperature and package footprint. The related MAX66240 lacks this device's wired host pins and must not be treated as a pin-for-pin substitute. No unverified internal alternate product link is asserted.

Maxim Integrated's MAX66242 abridged data sheet, 219-0038 Rev. 3 (April 2018), provides the exact MAX66242ESA+T order code, SOIC pin assignment, electrical characteristics, memory organization and protocol errata. Analog Devices hosts the manufacturer document and marks the family not recommended for new designs.

Check the full MAX66242ESA+T order code, lot traceability, package marking and tape-and-reel documentation. Verify the ROM ID, installed secret and protection settings through controlled functional tests; package appearance alone does not prove a correctly provisioned authenticator.

The manufacturer's errata identify two ISO 15693-3 timing noncompliances and an A0h error response to a peripheral transaction command when Address_Flag is zero. Validate the intended reader, I2C firmware and provisioning sequence. Harvested VOUT current is conditional on RF field strength; do not assume the stated maximum in every installation. Use the controlled data sheet and package drawing for final design approval.