Infineon Technologies CY15V108QN-40BFXI

Overview

CY15V108QN-40BFXI from Infineon is an 8 Mb serial ferroelectric RAM (F-RAM) organized as 1024K × 8, operating at up to 40 MHz SPI clock, with 1.71–1.89 V supply, industrial temperature range (–40°C to +85°C), and 10¹⁵ read/write endurance - deployed in real-time data logging systems requiring instant non-volatile writes without write delays.

For engineers reviewing the CY15V108QN-40BFXI datasheet, CY15V108QN-40BFXI pinout, CY15V108QN-40BFXI application, or CY15V108QN-40BFXI equivalent, key selection criteria include guaranteed 151-year data retention, hardware/software write protection, dedicated 256-byte reflow-survivable special sector, and drop-in SPI compatibility with legacy serial EEPROM/flash footprints.

Technical Context

The CY15V108QN implements a true SPI slave interface supporting modes 0 and 3, with zero-latency write execution - data commits immediately after byte transfer without polling or erase cycles. Its ferroelectric memory array eliminates wear leveling and page programming overhead inherent in flash.

It integrates a non-volatile status register, manufacturer/product ID, unique device ID, and user-writable 8-byte serial number. The dedicated 256-byte special sector retains data across up to three standard reflow soldering cycles, enabling board-level traceability and calibration storage.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), RoHS-compliant, surface-mount, 150 mil width.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial non-volatile memory applications.

Compared with CY15B108QN-40BFXI, the CY15V108QN offers tighter 1.71–1.89 V compliance critical for battery-powered 1.8 V systems; versus AT25SF041, it delivers 10¹⁰× higher endurance and eliminates erase latency - essential for deterministic real-time logging.

Availability

CY15V108QN-40BFXI is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, automotive body controllers, and portable medical diagnostics requiring stable component supply, long-term lifecycle assurance, and guaranteed 1.8 V-compatible non-volatile memory.

Supply support for CY15V108QN-40BFXI 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 German semiconductor leader specializing in power management, automotive ICs, and memory solutions, with global manufacturing and quality certification to ISO/TS 16949 and AEC-Q200.

The EXCELON™ LP F-RAM product line targets high-reliability, low-power, and high-endurance non-volatile memory applications where flash and EEPROM fail - especially in battery-constrained, write-intensive, and mission-critical systems.

FAQ

Is CY15V108QN-40BFXI pin-compatible with standard 8-pin SPI EEPROMs?

Yes - it uses identical SOIC-8 pinout (CS, SCK, SI, SO, WP, VSS, VDD, DNU) and SPI command set (Read, Write, WREN, WRDI, RDSR), enabling direct hardware replacement of serial EEPROMs like AT25DF041 without PCB redesign. The DNU pin has no internal connection and may float or tie to VDD.

Does CY15V108QN-40BFXI require external high-voltage programming or erase pulses?

No - it performs true RAM-like writes at bus speed using standard 1.71–1.89 V supply. There are no erase cycles, no high-voltage generators, and no write latency. Each byte writes instantly upon SPI transfer completion, eliminating polling loops and timeout handlers required by flash or EEPROM.

What is the purpose of the 256-byte special sector, and how is it accessed?

The dedicated 256-byte special sector stores calibration data, MAC addresses, or security keys that must survive PCB rework. It is accessed via separate opcodes (0x77 for read, 0x76 for write) and retains data through ≥3 Pb-free reflow cycles (260°C peak). Unlike main array, it is not subject to block protection schemes.

Can the unique device ID be used for cryptographic key derivation?

Yes - the factory-programmed 64-bit unique ID is laser-trimmed per die and cannot be altered. It serves as a hardware root-of-trust seed for HMAC-SHA256 key derivation in secure boot or firmware authentication flows. The 8-byte serial number register is user-writable for additional identity binding.