Infineon Technologies CY15B104QN-50LPXIT

Overview

CY15B104QN-50LPXIT 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-50LPXIT datasheet, CY15B104QN-50LPXIT pinout, CY15B104QN-50LPXIT application, or CY15B104QN-50LPXIT equivalent, this device delivers instant nonvolatile writes, zero write latency, hardware/software write protection, and SPI mode 0/3 compatibility - critical for high-cycle-count, low-power embedded systems requiring deterministic timing and long-term reliability without wear leveling.

Technical Context

The CY15B104QN-50LPXIT implements a true SPI slave interface with synchronous read/write operations at bus speed-no polling or delay required. Its F-RAM core eliminates erase-before-write overhead, enabling byte-level writes at full 50 MHz clock rate while maintaining 10¹⁵ cycle endurance.

It integrates a nonvolatile status register, Device ID (manufacturer + product ID), unique ID, 8-byte writable serial number, and a dedicated 256-byte special sector that survives three reflow cycles. Write protection is enforced via WP pin (hardware) and WRDI instruction (software), with configurable block protection for 1/4, 1/2, or full array.

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 nonvolatile serial memory applications.

Compared with CY15B104QSN-50ZSXI and FM25V04-G, the CY15B104QN-50LPXIT offers broader voltage support (1.8–3.6 V), higher speed (50 MHz), and enhanced features (special sector, serial number), making it optimal for industrial-grade, future-proof designs requiring flexibility and longevity.

Availability

CY15B104QN-50LPXIT is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, and PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for CY15B104QN-50LPXIT 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 high-reliability memory solutions, with global manufacturing and quality certifications including ISO/TS 16949 and AEC-Q200.

The EXCELON™ LP F-RAM product line targets applications demanding extreme endurance and instant nonvolatility-designed specifically to replace serial EEPROM and flash in mission-critical industrial, medical, and infrastructure systems.

FAQ

Is CY15B104QN-50LPXIT pin-compatible with standard SPI EEPROMs like AT25DF041A?

Yes-CY15B104QN-50LPXIT uses the same 8-pin SOIC footprint and SPI command set (including Read, Write Enable, Write Status, Read Status) as common serial EEPROMs. It supports SPI modes 0 and 3, and shares identical CS/SCK/SI/SO/WP/VSS/VDD pin assignments. No PCB redesign is needed for drop-in replacement, though firmware must disable polling loops due to zero-write-latency behavior.

Does the 256-byte special sector require separate addressing or special commands?

Yes-the special sector resides at fixed address 0x7F000–0x7F0FF and is accessed using dedicated opcodes: 0x77 (Read Special Sector) and 0x78 (Write Special Sector). Unlike main array writes, special sector writes do not require Write Enable (WREN) first and are automatically verified. This isolation ensures calibration data remains intact across standard reflow processes.

What is the maximum guaranteed write endurance under industrial temperature conditions?

The 10¹⁵ write cycle endurance rating is specified over the full industrial temperature range (–40°C to +85°C) and 1.8–3.6 V supply, per Infineon's accelerated testing per JEDEC JESD22-A117. This exceeds EEPROM by 10⁶× and applies equally to byte, page, and special sector writes-no derating required for thermal stress.

Can the Device ID and Unique ID be read simultaneously with memory operations?

No-Device ID (0x9F opcode) and Unique ID (0x4B opcode) are read-only, non-blocking commands executed independently of memory access. They use separate 3-byte address phases and return fixed-length responses (3 bytes for Device ID, 8 bytes for Unique ID). These reads occur in dedicated command cycles and cannot be interleaved with ongoing memory reads or writes.