Infineon Technologies SLE5542M32XHSA2

Overview

SLE5542M32XHSA2 from Infineon Technologies is an intelligent 256-byte EEPROM security IC with byte-wise write protection, a 3-byte programmable security code (PSC), and ISO/IEC 7816-compliant two-wire interface. It operates at 5 V ±10%, supports −40 °C to +80 °C ambient, delivers 100,000 erase/write cycles, and retains data for ≥10 years - deployed in contact smart cards for financial authentication and ID credentialing.

For engineers reviewing the SLE5542M32XHSA2 datasheet, SLE5542M32XHSA2 pinout, SLE5542M32XHSA2 application, or SLE5542M32XHSA2 equivalent, key selection criteria include PSC-verified memory access, irreversible 32-byte protection mapping, ISO/IEC 7816 synchronous reset behavior, and die/module packaging compatibility with card embedding processes.

Technical Context

The SLE5542 implements a synchronous two-wire interface (I/O + CLK) with Answer-to-Reset signaling per ISO/IEC 7816-3, requiring external clock input and supporting byte-wise addressing. Memory consists of 256 × 8-bit Data Memory and 32 × 1-bit Protection Memory, where each protection bit locks its corresponding data byte permanently.

Security enforcement relies on mandatory 3-byte PSC verification before any Data Memory write or Protection Memory update. The device uses 1.2 µm CMOS with shielded EEPROM cells, backside isolation-free layout, and integrated sensory logic to resist physical tampering - no internal voltage regulator or cryptographic engine is present.

Key Specifications

Pinout & Package

Package: T-M3.2-6 wire-bonded module for plastic card embedding; leadframe-based, epoxy-molded, 6-contact configuration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar intelligent EEPROM security applications.

Compared with SLE4442 and SLE5542P, the SLE5542M32XHSA2 uniquely combines field-programmable security code, module-level T-M3.2-6 packaging, and full ISO/IEC 7816-3 compliance - making it optimal for certified card manufacturers needing drop-in secure memory with upgradeable access control.

Availability

SLE5542M32XHSA2 is available at Aetrix Electronics and suitable for financial smart cards, national ID programs, telecom SIM modules, and physical access tokens requiring stable component supply and long-lifecycle support.

Supply support for SLE5542M32XHSA2 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 SLE55xx product line targets contact smart card applications requiring certified, tamper-resistant EEPROM with standardized interfaces and long-term data integrity - designed specifically for EMV, eIDAS, and ISO/IEC 14443-4 environments.

FAQ

What is the function of the N.C. pin (C6) on SLE5542M32XHSA2?

The N.C. (No Connection) pin at contact C6 is an unconnected, electrically isolated pad. It serves no functional role in operation and must remain floating - no external connection or pull-up/pull-down is permitted. Its presence accommodates mechanical alignment and standard ISO/IEC 7816-2 contact spacing requirements.

Can the Programmable Security Code (PSC) be changed after initial programming?

Yes, the 3-byte PSC can be rewritten multiple times, but only after successful verification of the currently active PSC. Each write operation requires full PSC validation, and no default or factory-reset value exists - loss of the PSC permanently disables further writes to both Data and Protection Memory.

Does SLE5542M32XHSA2 support contactless communication?

No. The SLE5542M32XHSA2 implements only a contact-based, ISO/IEC 7816-3 two-wire interface (CLK + I/O). It lacks RF frontend circuitry, antenna pads, or any contactless protocol stack - it is strictly a contact smart card IC and cannot operate in NFC or RFID modes.

How does the Protection Memory enforce write protection on Data Memory?

The 32-bit Protection Memory maps one bit to each of the first 32 data bytes (addresses 0–31). When a protection bit is set to '1', the corresponding data byte becomes read-only; writing to that address is rejected even after PSC verification. Once set, protection bits cannot be cleared - ensuring permanent lockdown of critical fields like manufacturer codes or root keys.