Infineon Technologies SLE 4432 M3.2

Overview

SLE 4432 M3.2 from Siemens AG is an intelligent 256-byte EEPROM IC designed for contact-based smart card applications, featuring byte-wise write protection of the lowest 32 addresses (0–31), ISO/IEC 7816-3 compliant Answer-to-Reset, and synchronous two-wire serial interface with CLK and I/O pins. It operates at 5 V, supports ≥10⁴ write/erase cycles, and guarantees ≥10-year data retention.

For engineers reviewing the SLE 4432 M3.2 datasheet, SLE 4432 M3.2 pinout, SLE 4432 M3.2 application in chip cards, or SLE 4432 M3.2 equivalent for secure memory replacement, this device delivers deterministic reset behavior, irreversible hardware-level memory protection, and contact-driven protocol timing aligned to EMV and banking card standards.

Technical Context

The SLE 4432 M3.2 implements a synchronous serial interface per ISO/IEC 7816-3, requiring external clock (CLK) and bidirectional open-drain I/O for command/data exchange. Reset is initiated via dedicated RST pin with standardized Answer-to-Reset sequence.

Its memory architecture separates 256 bytes of main EEPROM (addressable byte-wise) from a 32-bit protection register that permanently disables write access to the first 32 bytes after programming. No security code or PSC functionality - unlike SLE 4442 - is present.

Key Specifications

Pinout & Package

Supplied in M2.2 wire-bonded module format for direct embedding into PVC or polycarbonate smart cards; contact layout matches ISO/IEC 7816-2 mechanical specification for 8-pin card interface.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar contact smart card EEPROM applications.

Compared with AT88SC0104CA-SH and FM24CL04B, the SLE 4432 M3.2 uniquely combines ISO/IEC 7816-3 compliance, hardware-based 32-byte write lock, and deterministic 2.5 ms/byte programming - making it irreplaceable in cost-sensitive, standards-bound chip card applications where protocol fidelity and protection simplicity are mandatory.

Availability

SLE 4432 M3.2 is available at Aetrix Electronics and suitable for banking smart cards, government ID programs, and transit fare systems requiring stable component supply, long-term lifecycle assurance, and ISO/IEC 7816-3 interoperability.

Supply support for SLE 4432 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

Siemens AG Semiconductor Group, headquartered in Munich, Germany, developed foundational secure memory ICs for chip card infrastructure in the 1990s, emphasizing reliability, standard compliance, and industrial-grade qualification.

The SLE 4432 belongs to Siemens' early intelligent EEPROM product line targeting contact-based smart card applications - engineered specifically for EMV, ID, and transit systems requiring deterministic reset behavior and hardware-enforced memory protection.

FAQ

Is the SLE 4432 M3.2 compatible with ISO/IEC 7816-3 readers?

Yes. The SLE 4432 M3.2 implements full Answer-to-Reset (ATR) generation and synchronous two-wire communication per ISO/IEC 7816-3, including defined clock frequency range (1–5 MHz), voltage levels (5 V ±10%), and contact assignment (C1–C8). It has been validated in certified banking and ID card readers.

What happens after programming the protection memory?

Once the 32-bit protection register is written, addresses 0–31 become permanently read-only. No command or voltage condition can reverse this state. Subsequent write attempts to those locations are ignored, and the device returns status indicating protection violation - ensuring immutable system-critical data storage.

Does the SLE 4432 M3.2 support security code verification like the SLE 4442?

No. The SLE 4432 M3.2 lacks programmable security code (PSC) functionality, security memory, and compare commands. It provides only hardware-based write protection. Security features such as 3-byte PSC entry and verification are exclusive to the SLE 4442 variant and are not implemented in this part.

Can the SLE 4432 M3.2 operate at voltages other than 5 V?

No. The device is specified exclusively for 5 V ±10% operation (4.5–5.5 V). It does not support 3.3 V or dual-voltage operation. Attempting to power outside this range may cause undefined behavior, failed ATR, or permanent damage per absolute maximum ratings in the original Siemens datasheet.