Analog Devices Inc./Maxim Integrated MAX66040E-000AA+

Overview

MAX66040E-000AA+ from Maxim Integrated is an ISO/IEC 14443 Type B-compliant secure memory IC integrating 1024-bit user EEPROM, 64-bit UID, 64-bit secret key, and a hardware SHA-1 engine for challenge-response authentication. It operates at 13.56 MHz ±7 kHz, supports up to 847.5 kbps data rate, and delivers 200,000 write/erase cycles with 40-year data retention - deployed in fleet driver ID cards requiring tamper-resistant credential storage.

For engineers reviewing the MAX66040E-000AA+ datasheet, MAX66040E-000AA+ pinout, MAX66040E-000AA+ application, or MAX66040E-000AA+ equivalent, key selection considerations include ISO/IEC 14443-4 block transmission protocol compliance, UID structure (E0h/2Bh prefix), AFI/CID support, parasitic power operation, and page-level EPROM emulation with read/write protection.

Technical Context

The MAX66040E-000AA+ implements a full ISO/IEC 14443-4 Type B block transmission protocol stack with I-block, R-block, and S-block handling - supporting ATTRIB-based activation into ACTIVE state and HALT transitions via DESELECT. It uses load modulation with BPSK subcarrier (847.5 kHz) for uplink and 10% ASK modulation for downlink at selectable rates (105.9–847.5 kbps).

Its secure architecture centers on a dedicated 512-bit SHA-1 engine that computes 160-bit MACs using EEPROM data and the 64-bit secret key, enabling mutual authentication for both read and write operations. Memory is organized as 19 × 8-byte blocks: 16 user EEPROM blocks (grouped into four 256-bit pages), one 64-bit secret block, and two 8-byte control/register blocks - each with user-readable write-cycle counters except the secret block.

Key Specifications

Pinout & Package

MAX66040E-000AA+ is packaged in an ISO card format (credit-card sized plastic substrate with embedded antenna), containing no external pins or terminals. Power and communication occur entirely via magnetic coupling at 13.56 MHz - RX_IN and TX_OUT are internal RF front-end nodes, not user-accessible pins. The device operates in parasitic power mode only.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar secure RFID memory applications.

Compared with SLI13S and SR3000, the MAX66040E-000AA+ uniquely combines ISO/IEC 14443 Type B compliance, on-chip SHA-1, factory-programmed UID with Maxim's 2Bh manufacturer code, and page-level read/write protection - making it optimal for cost-sensitive, offline-capable fleet ID and access control cards requiring deterministic authentication.

Availability

MAX66040E-000AA+ is available at Aetrix Electronics and suitable for driver identification (fleet), access control, and e-cash applications requiring stable component supply, RoHS-compliant packaging, and long-lifecycle support in ISO card form factor.

Supply support for MAX66040E-000AA+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and secure ICs for industrial, automotive, and computing applications - emphasizing reliability, integration, and security.

The MAX66040 product line delivers ISO/IEC 14443 Type B-compliant secure memory ICs optimized for contactless credentialing in constrained environments - targeting applications where parasitic power, deterministic UID, and hardware-accelerated SHA-1 are mandatory.

FAQ

What is the operating temperature range for MAX66040E-000AA+?

The MAX66040E-000AA+ is specified for operation from -25°C to +50°C, validated for use in vehicle-mounted fleet ID cards and indoor access control terminals. This range reflects its intended deployment in consumer-facing and light-industrial environments where ambient thermal stress is moderate. The device does not support extended industrial (-40°C to +85°C) or automotive AEC-Q200 temperature grades.

Does MAX66040E-000AA+ support ISO/IEC 14443 Type A readers?

No, MAX66040E-000AA+ is strictly ISO/IEC 14443 Type B compliant (Parts 2–4) and incompatible with Type A readers. It responds only to REQB, WUPB, SLOT-MARKER, and ATTRIB commands - not to REQA or SEL commands used in Type A protocols. Attempting to operate MAX66040E-000AA+ with a Type A reader will result in no response or protocol timeout.

How is power delivered to MAX66040E-000AA+?

MAX66040E-000AA+ operates exclusively in parasitic power mode - deriving all operating energy from the 13.56 MHz RF field generated by the reader. It has no V_CC pin or external power connection. Minimum required incident magnetic field strength is 123.5 dBµA/m (for key fob variant) or 110.0 dBµA/m (for ISO card variant), per datasheet Electrical Characteristics.

Can the 64-bit secret in MAX66040E-000AA+ be changed after programming?

Yes, the 64-bit secret in MAX66040E-000AA+ is user-programmable and can be rewritten multiple times - subject to the same 200,000-cycle endurance limit as other EEPROM blocks. However, once written, the secret remains inaccessible to readback; only authenticated write operations (using prior secret) can update it. No factory-default secret is shipped - initial programming is required during personalization.

What memory protection mechanisms does MAX66040E-000AA+ provide?

MAX66040E-000AA+ provides per-page write protection, EPROM emulation mode (preventing accidental overwrites), and optional read protection on Page 3. Write protection and EPROM mode are configurable per 256-bit page (Pages 0–3); Page 3 read protection enhances authentication strength by hiding critical control data from unauthorized reads - all enforced in hardware without host intervention.