Infineon Technologies S29AL008J55TFIR20

Overview

S29AL008J55TFIR20 from Infineon Technologies (formerly Cypress) is an 8 Mbit (1 M × 8-bit / 512 K × 16-bit), 3.0 V-only boot sector Flash memory with 55 ns access time, automotive-grade AEC-Q100 Grade 1 (–40 °C to +125 °C) qualification, and flexible sector architecture including one 16 KB, two 8 KB, one 32 KB, and fifteen 64 KB sectors. It supports in-system programming via standard 3.0 V V_CC, features Secured Silicon Sector with 128-word ESN, and is used for firmware storage and boot code execution in engine control units and ADAS modules.

For engineers reviewing the S29AL008J55TFIR20 datasheet, S29AL008J55TFIR20 pinout, S29AL008J55TFIR20 application, or S29AL008J55TFIR20 equivalent, key selection criteria include boot-block configuration (top/bottom), sector protection granularity, CFI compliance for host auto-configuration, erase suspend/resume capability, and RY/BY# hardware status signaling - all critical for real-time embedded firmware update reliability.

Technical Context

The S29AL008J55TFIR20 implements a command-register-driven state machine for Embedded Erase and Embedded Program algorithms, eliminating external high-voltage requirements. It uses Fowler-Nordheim tunneling for erase and hot electron injection for program operations, with internal voltage regulation enabling full 2.7–3.6 V operation.

Its dual-mode interface supports byte (DQ7–DQ0) and word (DQ15–DQ0) data widths via BYTE# pin control, and integrates hardware features including WP#-controlled boot-sector lock, RESET#-initiated state reset, and RY/BY# output for cycle completion detection - all compliant with JEDEC JESD21-C single-power-supply Flash standards.

Key Specifications

Pinout & Package

Package: 48-ball Fine-pitch BGA (VBK048, 8.15 mm × 6.15 mm × 1.00 mm, 0.8 mm pitch).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boot-sector Flash memory applications.

Compared with S29AL008J55TFIR20, the S29GL01GP12TFIV10 offers higher capacity but sacrifices security and configurability, while the MX29LV008CTTI-55G provides basic boot Flash functionality at lower cost but lacks automotive qualification and real-time update capabilities.

Availability

S29AL008J55TFIR20 is available at Aetrix Electronics and suitable for engine control units, ADAS processors, and body control modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for S29AL008J55TFIR20 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 global semiconductor leader specializing in power systems, sensors, and security solutions, with deep expertise in automotive-grade memory and microcontroller technologies.

The S29AL008J belongs to Infineon's automotive-qualified parallel NOR Flash portfolio, designed specifically for mission-critical firmware storage in powertrain, chassis, and driver assistance systems where data integrity and long-term reliability are mandatory.

FAQ

Is S29AL008J55TFIR20 pin-compatible with earlier S29AL008D variants?

Yes - the S29AL008J55TFIR20 maintains identical pinout and software command set compatibility with the S29AL008D, including TSOP-48 and VBK048 BGA packages. It is manufactured on 110 nm process but retains full functional and timing equivalence per JEDEC JESD21-C, enabling drop-in replacement in existing designs without layout or firmware changes.

What is the function of the BYTE# pin, and how does it affect data bus configuration?

The BYTE# pin selects between 8-bit (BYTE# = HIGH) and 16-bit (BYTE# = LOW) data interface modes. In byte mode, DQ7–DQ0 carry data and A-1 is multiplexed onto DQ15; in word mode, DQ15–DQ0 carry full 16-bit data. This dual-mode capability allows seamless integration with both legacy 8-bit microcontrollers and modern 16-bit SoCs using the same physical device.

How does the Secured Silicon Sector differ from standard Flash sectors?

The Secured Silicon Sector is a dedicated 128-word (256-byte) region pre-configured at wafer level with unique factory-programmed content, including an 8-word random Electronic Serial Number. Once locked (via command sequence), it becomes permanently read-only and immune to erase or program commands - enabling tamper-resistant device identification and secure boot key storage not possible in standard user-addressable sectors.

Can WP# be left unconnected, and what is its default logic state?

Yes - WP# has an internal pull-up resistor and defaults to VIH (logic HIGH) when unconnected, placing the device in write-enabled state. To protect the boot sector (first or last 16 KB depending on top/bottom configuration), WP# must be actively driven LOW. This design prevents accidental lockout during development while enabling robust hardware-based protection in production systems.