Infineon Technologies SLE 7737E M3.2

Overview

SLE 7737E M3.2 from Infineon Technologies is a secure EEPROM-based counter IC with 237-bit nonvolatile counter storage, integrated cryptographic authentication logic, and ISO/IEC 14443 Type A contactless interface. It operates at 13.56 MHz, supports DES/Triple-DES encryption, and is designed for tamper-resistant usage counting in pay-per-use smart cards and secure tokens.

For engineers reviewing the SLE 7737E M3.2 datasheet, SLE 7737E M3.2 pinout, SLE 7737E M3.2 application, or SLE 7737E M3.2 equivalent, key selection criteria include counter bit depth, cryptographic algorithm support, contactless protocol compliance, and secure memory write endurance.

Technical Context

This device implements a dedicated hardware counter block with atomic increment protection and anti-rollback enforcement. Its secure execution environment isolates counter updates from host-side software intervention, and all cryptographic operations are performed within an on-die secure co-processor compliant with Common Criteria EAL4+.

The ISO/IEC 14443-A Layer 3 protocol stack is fully embedded and handles anticollision, activation, and command-response framing without external controller assistance. Memory access is gated by mutual authentication prior to any read/write operation.

Key Specifications

Pinout & Package

M3.2-6 package: 6-pin molded plastic module with integrated antenna coil connection points and contact pads for power, ground, and test interfaces. Designed for embedding into PVC or PET smart card laminates.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST25DV04K and AT88SC0204CRF, the SLE 7737E M3.2 uniquely integrates a hardened 237-bit counter with cryptographic enforcement, eliminating reliance on external controllers for tamper-proof usage tracking - essential for regulated pay-per-use and safety-critical deployments.

Availability

SLE 7737E M3.2 is available at Aetrix Electronics and suitable for pay-per-use smart cards, secure physical access tokens, disposable medical cartridges, and industrial calibration certificates requiring stable component supply and long-term lifecycle assurance.

Supply support for SLE 7737E M3.2 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

Infineon Technologies is a German semiconductor manufacturer specializing in security, power management, and automotive ICs, with global manufacturing and certification infrastructure.

The SLE family targets high-assurance secure identification and usage control, delivering certified cryptographic functions and tamper-resistant nonvolatile counters for regulated markets including healthcare, transport, and industrial certification.

FAQ

What security certifications apply to the SLE 7737E M3.2?

The SLE 7737E M3.2 is certified to Common Criteria EAL4+ under AVA_VAN.1 and ALC_FLR.2, and holds ISO/IEC 15408 evaluation assurance for its cryptographic counter and authentication subsystems. It also meets FIPS 140-2 Level 3 requirements for physical security mechanisms including active shield and sensor-triggered memory wipe.

Can the counter be reset or reprogrammed after initial programming?

No - the 237-bit counter is strictly monotonic and irreversible. Once incremented, it cannot be decremented, reset, or rewritten. The hardware enforces anti-rollback protection at the gate level, and no command set provides counter modification capability, even with valid cryptographic credentials.

Does the device require an external microcontroller to operate?

No - the SLE 7737E M3.2 operates autonomously using harvested RF energy. Its embedded ISO/IEC 14443-A protocol stack, crypto engine, and counter logic execute entirely on-die. External controllers are optional for system-level orchestration but unnecessary for core counter and authentication functions.

What is the maximum operating distance for contactless communication?

At 13.56 MHz with standard 4-cm² loop antenna and 1 W ERP reader, the SLE 7737E M3.2 achieves reliable communication up to 5 cm. Performance depends on antenna geometry, reader field strength, and card lamination materials - typical transit card implementations achieve 3–4 cm consistent read range.