Infineon Technologies SLE 7736 M3.2

Overview

SLE 7736 M3.2 from Infineon Technologies is a contact-based smart card IC designed for prepaid telecom applications, featuring a 237-bit EEPROM counter (up to 33,352 units), dual authentication keys (48-bit Key 1 and optional 48-bit Key 2), Card-Trash physical devaluation mechanism, and ISO/IEC 7816-compliant synchronous Answer-to-Reset. It operates at 5 V ±10% with <1 mA supply current and supports ambient temperatures from –40 °C to +80 °C.

For engineers reviewing the SLE 7736 M3.2 datasheet, SLE 7736 M3.2 pinout, SLE 7736 M3.2 application in prepaid cards or pay TV, or SLE 7736 M3.2 equivalent for Eurochip 77 migration, this page delivers verified functional identity, security architecture details, counter endurance (10⁵ cycles), data retention (30 years), and ISO/IEC 7816 contact interface behavior.

Technical Context

The SLE 7736 M3.2 implements a five-stage abacus counter with backup anti-tearing flags and optional disabling via mask option. Its authentication unit performs challenge-response using a 16-bit response calculated within 30 ms at 100 kHz clock, supporting cipher block chaining for counter value certification.

Security logic includes exclusive EEPROM security cells, shielded deeper metal layers, secure wiring for sensitive signals, and integrated Card-Trash mechanism that physically disables authentication and programming voltage generation upon activation. The chip uses 1.2 µm IMEM CMOS technology optimized for resistance against physical and electrical side-channel analysis.

Key Specifications

Pinout & Package

Supplied as a wire-bonded module (M3) for embedding into plastic smart cards; compatible with ISO/IEC 7816-2 contact layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart card counter and authentication applications.

Compared with SLE 7736E, the base SLE 7736 offers tighter Infineon-controlled 3rd-byte coding but less issuer flexibility; versus SLE 5536S, it adds Card-Trash, dual-key auth, and enhanced side-channel resistance-critical for high-risk prepaid environments.

Availability

SLE 7736 M3.2 is available at Aetrix Electronics and suitable for prepaid telephone cards, pay-TV smart cards, and public transport fare systems requiring stable component supply, long-term data retention, and certified physical devaluation capability.

Supply support for SLE 7736 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 AG is a German semiconductor manufacturer specializing in security ICs, power management, and automotive electronics, headquartered in Munich.

The SLE 7736 belongs to Infineon's Eurochip 77 family of contact smart card ICs, engineered specifically for high-assurance prepaid and identity applications demanding tamper-resistant memory, authenticated value transfer, and irreversible devaluation.

FAQ

What is the maximum guaranteed counter value for SLE 7736 M3.2?

The SLE 7736 M3.2 guarantees a minimum of 21,064 count units for production testing purposes. Its full architectural capacity is 33,352 units, implemented as a five-stage abacus counter with anti-tearing backup bits. This value is fixed by mask ROM configuration and cannot be altered post-fabrication.

Does SLE 7736 M3.2 support 3 V operation?

No - the standard SLE 7736 M3.2 operates at 5 V ±10% (Class A). For 3 V compatibility, the SLE 7736-V3 or SLE 7736E-V3 variants must be selected; these extend the supply range to 2.7–5.5 V and retain identical security and counter functionality.

How does the Card-Trash mechanism physically disable the chip?

Card-Trash triggers permanent internal fusing that disconnects the programming voltage generator and disables the authentication computation unit. Once activated, the chip ceases to respond to authentication challenges or accept EEPROM writes, rendering it functionally inert while retaining stored counter and ID data in read-only state.

Is SLE 7736 M3.2 pin-compatible with SLE 5536S M3.2?

Yes - both use identical ISO/IEC 7816-2 contact layout (C1–C7) and wire-bonded M3 module form factor. However, SLE 7736 M3.2 introduces new internal security states (e.g., Card-Trash flag) and requires updated terminal firmware to exploit dual-key authentication and counter certification features.