Infineon Technologies CY15B104QN-50LPXI

Overview

CY15B104QN-50LPXI from Infineon is a 4-Mb serial ferroelectric RAM (F-RAM) organized as 512K × 8, operating over SPI at up to 50 MHz with 1.8 V–3.6 V supply, 10¹⁵ write endurance, and 151-year data retention. It serves as a nonvolatile memory replacement for EEPROM/flash in real-time data logging, industrial control registers, and power-fail-safe parameter storage.

For engineers reviewing the CY15B104QN-50LPXI datasheet, CY15B104QN-50LPXI pinout, CY15B104QN-50LPXI application, or CY15B104QN-50LPXI equivalent, key selection criteria include SPI mode 0/3 compatibility, hardware/software write protection, deep power-down current (0.70 µA), special sector reflow resilience, and industrial temperature range (–40°C to +85°C).

Technical Context

The CY15B104QN-50LPXI implements an SPI slave interface with zero-latency writes-no polling required-due to ferroelectric memory cell architecture enabling immediate byte-level nonvolatile storage. Its status register supports WPEN-controlled hardware write protection via the WP pin and software block protection for 1/4, 1/2, or full array.

It integrates a dedicated 256-byte special sector F-RAM that survives up to three standard reflow cycles, plus Device ID (manufacturer + product ID), Unique ID, and user-writable 8-byte serial number registers-all accessible via standardized SPI opcodes without timing overhead.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), RoHS-compliant, surface-mount, standard footprint compatible with automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial nonvolatile memory applications.

Compared with CY15B104QN-50LPXI, the UFLGA variant offers identical electrical behavior in a smaller footprint, while the AT45DB041E trades endurance and instant-write capability for legacy compatibility and lower unit cost-making it viable only where write frequency is <100×/day.

Availability

CY15B104QN-50LPXI is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical calibration storage, and automotive ADAS sensor modules requiring stable component supply across extended product lifecycles.

Supply support for CY15B104QN-50LPXI 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 systems, sensors, and nonvolatile memory solutions for industrial, automotive, and IoT applications.

The EXCELON™ LP F-RAM product line delivers instant-write, high-endurance, low-power nonvolatile memory targeting applications where flash/EEPROM limitations cause system-level reliability or timing issues.

FAQ

What SPI modes does CY15B104QN-50LPXI support?

It supports SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1). In both modes, data is sampled on the rising edge of SCK and output on the falling edge. The device ignores invalid modes and will not respond to unsupported clock polarity/phase configurations.

Can the WP pin be left unconnected?

No-WP must be tied to VDD if not actively used. Leaving it floating risks unintended write protection activation due to noise coupling, which would block status register updates and render software write protection inoperable until reset.

Is the 256-byte special sector accessible via standard read/write commands?

Yes-but only using dedicated opcodes (0x77 for write, 0x78 for read). Standard memory opcodes (0x02/0x03) cannot access this sector. Its contents survive reflow because it uses hardened ferroelectric cells with enhanced thermal stability.

How does the 10¹⁵ write endurance translate to real-world usage?

At 100 writes/second continuously, the memory lasts over 317 centuries. In practice, it exceeds mechanical lifetime of most industrial equipment-enabling true "set-and-forget" data logging without wear monitoring or firmware wear-leveling logic.