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Home > Products > Integrated Circuits (ICs) > Embedded > Application Specific Microcontrollers

Infineon Technologies SLE 4442 M3.2

Name: SLE 4442 M3.2
Brand: Infineon Technologies
SKU: SLE 4442 M3.2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SLE 4442 M3.2

Manufacturer:: Infineon Technologies

Category:: Application Specific Microcontrollers

Package:: M3.2 Chip Card Module

Datasheet:: SLE 4442 M3.2.pdf

Description:: IC EEPROM 256BYTE M3.2 PKG

Quantity:: RFQ Add To RFQ list

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Inventory:3,370

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Product details

Overview

SLE 4442 M3.2 from Siemens AG is an intelligent 256-byte EEPROM IC for contact-based smart cards, featuring a 3-byte programmable security code (PSC), irreversible byte-wise write protection for addresses 0–31, and ISO/IEC 7816-3 synchronous two-wire interface. It operates at 5 V, supports ≥10⁴ write/erase cycles, and guarantees ≥10-year data retention - deployed in telecom SIM cards and pay-TV conditional access modules.

For engineers reviewing the SLE 4442 M3.2 datasheet, SLE 4442 M3.2 pinout, SLE 4442 M3.2 application in secure memory systems, or SLE 4442 M3.2 equivalent for legacy chip card designs, this page delivers verified electrical specs, contact-level timing behavior, PSC verification workflow, and functional distinctions versus SLE 4432.

Technical Context

The SLE 4442 implements a synchronous serial interface compliant with ISO/IEC 7816-3 using CLK and bidirectional I/O lines, with RST-controlled reset and Answer-to-Reset sequence. Memory is partitioned into 256-byte main memory, 32-bit protection memory (bits 0–31), and 24-bit security memory (3-byte PSC).

PSC verification must precede any update to main or security memory; failure locks further writes until next power cycle. All programming operations require 2.5 ms per byte, with erase-and-write combined in a single command - no separate erase step needed.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	256 × 8-bit EEPROM - fixed address space for secure credential storage
Security feature	3-byte programmable security code (PSC) - required before memory update, prevents unauthorized modification
Write protection	Irreversible byte-wise lock for addresses 0–31 - permanently disables write/erase on first programming
Endurance	≥10⁴ write/erase cycles - validated under 5 V, 25 °C, defines field lifetime in high-turnover card applications
Data retention	≥10 years - guaranteed minimum retention at 25 °C, critical for long-life ID and banking cards
Interface protocol	ISO/IEC 7816-3 synchronous two-wire - uses CLK + open-drain I/O, no UART or SPI framing
Programming time	2.5 ms per byte - fixed duration for both erase and write, enables deterministic timing in host firmware

Pinout & Package

Supplied in M3.2 wire-bonded module form for direct embedding into PVC or PET smart cards; conforms to ISO/IEC 7816-2 physical contact layout (8-contact pad array).

Pin/Terminal	Circuit Role	Design Meaning
C1	VCC	5 V supply input - powers internal logic and EEPROM array; no internal voltage regulation
C2	RST	Active-low reset - initiates Answer-to-Reset sequence and resets internal state machine
C3	CLK	Clock input - synchronous edge-triggered timing reference for all serial transfers
C4	N.C.	No connection - floating, not bonded, electrically isolated
C5	GND	Ground reference - return path for VCC and signal currents; must be low-impedance in card reader design
C6	N.C.	No connection - floating, not bonded, electrically isolated
C7	I/O	Bidirectional open-drain data line - carries commands, addresses, and data; requires external pull-up
C8	N.C.	No connection - floating, not bonded, electrically isolated

Key Features

Feature	Design Value
Programmable Security Code (PSC)	24-bit user-defined code stored in dedicated security memory; mandatory verification before any memory update
Irreversible Protection Memory	32-bit register locking addresses 0–31 - once set, protection cannot be cleared or altered
ISO/IEC 7816-3 Compliance	Full synchronization via CLK/I/O pair - eliminates need for baud rate negotiation or start/stop bits
Deterministic Programming Timing	Fixed 2.5 ms per byte - simplifies host controller timeout handling and avoids variable latency stalls
Answer-to-Reset Sequence	Standardized 20-byte response after reset - enables automatic card type detection in multi-IC readers

Applications

Telecom SIM Cards

Pay-TV Conditional Access

Use Scenario: Embedded in plastic SIM cards for GSM networks to store IMSI, Ki key, and network authentication data.

IC Role / Device Role / Timing Role: Secure nonvolatile memory with PSC-enforced write control - prevents over-the-air tampering of cryptographic keys.

Use Value: Irreversible protection of first 32 bytes ensures IMSI and Ki remain unalterable after personalization, meeting GSMA security requirements.

Use Scenario: Integrated into pay-TV smart cards to hold decryption keys and entitlement management messages.

IC Role / Device Role / Timing Role: Tamper-resistant EEPROM with PSC-gated updates - restricts key changes to authorized broadcast operators only.

Use Value: 10-year data retention and 10⁴ endurance support multi-year card lifetimes without field replacement.

Banking EMV Cards

Government ID Cards

Use Scenario: Used in EMV-compliant credit/debit cards to store application identifiers, public key certificates, and transaction logs.

IC Role / Device Role / Timing Role: ISO 7816-3 compliant secure memory - interfaces directly with terminal readers using standard clock/data signaling.

Use Value: Synchronous two-wire protocol reduces contact count and simplifies card PCB routing versus UART-based alternatives.

Use Scenario: Deployed in national eID cards for biometric template storage and digital signature key pairs.

IC Role / Device Role / Timing Role: High-reliability EEPROM with irreversible protection - safeguards root-of-trust data against physical or logical overwrite.

Use Value: 256-byte capacity balances cost and functionality for lightweight PKI implementations in citizen ID programs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SLE 4432 M2.2	Lacks PSC and security memory; no password protection - only 32-bit protection memory for addresses 0–31	Acceptable for non-cryptographic applications like loyalty cards where key secrecy is not required	Select only when full PSC enforcement is unnecessary and cost reduction is prioritized
AT88SC0104CA-SH	1-Kbit EEPROM with hardware security logic, SHA-1 engine, and configurable memory segmentation	Supports advanced crypto operations and dynamic memory partitioning - exceeds SLE 4442's static security model	Choose when migrating to modern secure microcontrollers with active authentication, not passive EEPROM

Compared with SLE 4432 M2.2, the SLE 4442 M3.2 adds mandatory PSC verification for memory writes - essential for cryptographic key integrity. Versus AT88SC0104CA-SH, it offers simpler integration and lower power but lacks on-chip crypto acceleration and flexible memory mapping.

Availability

SLE 4442 M3.2 is available at Aetrix Electronics and suitable for telecom SIM cards, pay-TV conditional access modules, banking EMV cards, and government eID programs requiring stable component supply across long-lifecycle deployments.

Supply support for SLE 4442 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, designed high-reliability ICs for industrial, automotive, and secure identification markets prior to spin-off as Infineon Technologies in 1999.

The SLE 4442 belongs to Siemens' Chip Card IC product line, engineered specifically for ISO/IEC 7816-compliant contact smart cards requiring tamper-resistant, field-programmable memory with hardware-enforced access control.

FAQ

What is the function of the PSC in the SLE 4442 M3.2?

The Programmable Security Code (PSC) is a 24-bit value stored in dedicated security memory. Before any update to main or security memory, the host must send the correct PSC via the Compare Verification Data command. If verification fails, all subsequent write attempts are rejected until the next power-on reset - enforcing strict access control for sensitive data.

Can the SLE 4442 M3.2 be used without connecting all eight contacts?

Yes - only C1 (VCC), C2 (RST), C3 (CLK), C5 (GND), and C7 (I/O) are functional. Contacts C4, C6, and C8 are explicitly marked N.C. (no connection) in the datasheet and must remain unconnected in card layout. Leaving them floating poses no electrical risk.

How does the irreversible write protection work on addresses 0–31?

Protection is implemented via a dedicated 32-bit protection memory. Each bit corresponds to one of the lowest 32 main memory addresses. Writing a '1' to a protection bit permanently disables write/erase operations to that address - the bit cannot be cleared or rewritten. This is a one-time hardware fuse mechanism, not software-configurable.

Is the SLE 4442 M3.2 compatible with ISO/IEC 7816-3 readers?

Yes - it fully complies with ISO/IEC 7816-3 for synchronous transmission using CLK and I/O lines. Its Answer-to-Reset sequence matches the standard format, and timing parameters (e.g., clock frequency range, setup/hold times) meet Class A/B reader specifications. No protocol translation or adapter is required.

SLE 4442 M3.2 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: M3.2 Chip Card Module

Packaging:: Bulk

Product Status:: Discontinued at Digi-Key

Programmable:: Not Verified

Applications:: Security

Core Processor:: -

Program Memory Type:: -

Controller Series:: -

RAM Size:: -

Interface:: -

Number of I/O:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: M3.2 Chip Card Module

SLE 4442 M3.2 FAQ

1.How can I place an order for SLE 4442 M3.2 through Aetrix?

Please submit a Request for Quotation (RFQ) for SLE 4442 M3.2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SLE 4442 M3.2 reliable?

The price and inventory of SLE 4442 M3.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SLE 4442 M3.2 is usually 5 days.

3.What payment methods are accepted for SLE 4442 M3.2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SLE 4442 M3.2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SLE 4442 M3.2?

SLE 4442 M3.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SLE 4442 M3.2 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SLE 4442 M3.2?

For technical support, including SLE 4442 M3.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SLE 4442 M3.2 requirements.

6.How does Aetrix verify that SLE 4442 M3.2 is sourced from the original manufacturer or authorized distributors?

All SLE 4442 M3.2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SLE 4442 M3.2 meets industry standards.

7.What is the process for return or replacement of SLE 4442 M3.2?

All SLE 4442 M3.2 units undergo pre-shipment inspection (PSI). If there is an issue with SLE 4442 M3.2, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SLE 4442 M3.2 part is unused and in its original packaging.

Return procedure for SLE 4442 M3.2:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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