Infineon Technologies CY15B104QN-50BFXIT

Overview

CY15B104QN-50BFXIT 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 nonvolatile memory in industrial data loggers where rapid, reliable byte-level writes replace EEPROM or flash.

For engineers reviewing the CY15B104QN-50BFXIT datasheet, CY15B104QN-50BFXIT pinout, CY15B104QN-50BFXIT application, or CY15B104QN-50BFXIT equivalent, this device delivers instant nonvolatile writes, hardware/software write protection, dedicated 256-byte special sector, and industrial temperature support (–40°C to +85°C) without polling delays.

Technical Context

The CY15B104QN-50BFXIT implements an SPI slave interface supporting modes 0 and 3, with zero-latency writes enabled by ferroelectric memory cells-no internal write cycle or erase step required. Its status register controls block protection (1/4, 1/2, or full array), WPEN bit enables hardware write protection via the WP pin, and Device ID/Serial Number registers provide traceability.

It features four low-power states: active (2.4 mA @ 40 MHz), standby (2.3 µA), deep power-down (0.70 µA), and hibernate (0.1 µA). The 256-byte special sector survives up to three reflow cycles, enabling board-level serialization and calibration storage independent of main array wear.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), RoHS-compliant, surface-mount, standard footprint compatible with JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY15B104QN-50ZSXI, the -50BFXIT offers identical core performance but with BFXIT-specific reel coding and traceability; versus FM25V04-G, it adds critical features for certified medical and utility metering: serial number, special sector, and tighter 1.8 V min operation.

Availability

CY15B104QN-50BFXIT is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, automotive body control modules, and medical diagnostic equipment requiring stable component supply across extended lifecycles.

Supply support for CY15B104QN-50BFXIT 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 manufacturer specializing in power management, automotive ICs, and nonvolatile memory solutions.

The EXCELON™ LP F-RAM product line targets high-reliability, high-endurance nonvolatile memory applications where flash and EEPROM fail-especially in industrial, automotive, and medical systems demanding frequent writes and long data retention.

FAQ

Is CY15B104QN-50BFXIT pin-compatible with standard SPI EEPROMs or flash devices?

Yes-it uses an industry-standard 8-pin SOIC footprint and SPI command set compatible with common serial EEPROMs (e.g., AT25DF041) and flash (e.g., W25Q40), enabling drop-in replacement without PCB redesign. However, its zero-write-delay behavior eliminates need for status polling, simplifying firmware.

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

Yes-the special sector is accessed using dedicated opcodes (0x80 for read, 0x81 for write) and resides at fixed address 0x000000. It operates independently of the main array, retains data through reflow, and supports full read/write endurance without affecting main memory wear metrics.

What is the minimum VDD required for reliable SPI communication at 50 MHz?

The device guarantees full 50 MHz operation down to 1.8 V per datasheet Section 6 (Operating Range). At 1.8 V, t_CLK ≥ 20 ns is maintained, and all AC timing parameters-including setup/hold for SI and SO-are met with standard SPI master drive strength.

How does write protection behave when both WP pin and status register bits are active?

Hardware write protection via WP takes precedence: when WP is LOW and WPEN = 1 in the status register, writes to the status register itself are blocked-even WRDI or WREN commands are ignored. Main array writes remain controllable via software block protection bits, provided WP is not asserted.