Infineon Technologies CY15E004Q-SXAT

Overview

CY15E004Q-SXAT from Cypress Semiconductor is a 4-Kbit (512 × 8) serial SPI F-RAM nonvolatile memory with automotive-grade qualification (–40 °C to +85 °C), 20 MHz max SPI clock, NoDelay™ write capability, 10¹⁴ read/write endurance, and RoHS-compliant 8-pin SOIC package. It serves as a hardware drop-in replacement for serial EEPROM/flash in data-logging and real-time control systems requiring rapid, reliable nonvolatile writes.

For engineers reviewing the CY15E004Q-SXAT datasheet, CY15E004Q-SXAT pinout, CY15E004Q-SXAT application, or CY15E004Q-SXAT equivalent, key selection criteria include SPI mode 0/3 compatibility, WP/HOLD pin behavior, 4.5–5.5 V supply range, 151-year data retention, and errata regarding WEL bit persistence at addresses 0x100–0x1FF.

Technical Context

The CY15E004Q-SXAT implements a ferroelectric memory array with zero-write-latency operation: each byte is committed immediately upon successful SPI transfer without polling. Its status register supports software block protection (1/4, 1/2, or full array) and write enable latch control, though errata confirms the WEL bit does not clear after writes to addresses 0x100–0x1FF.

It operates as an SPI slave in modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), with inputs latched on rising SCK edge and outputs driven on falling edge. Chip select must fall before each opcode, and HOLD suspends ongoing operations only when asserted while SCK is LOW.

Key Specifications

Pinout & Package

8-pin Small Outline Integrated Circuit (SOIC) package with standard gull-wing leads, 1.27 mm pitch, and RoHS-compliant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25DF041A-SSH-T and BR24G04FJ-3GE2, CY15E004Q-SXAT uniquely delivers true RAM-like write speed with nonvolatile retention, eliminating firmware overhead for erase management and enabling reliable high-frequency data capture in automotive environments.

Availability

CY15E004Q-SXAT is available at Aetrix Electronics and suitable for telematics data logging, ECU calibration storage, and ADAS sensor fusion requiring stable component supply across automotive production lifecycles.

Supply support for CY15E004Q-SXAT 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

Cypress Semiconductor (now part of Infineon Technologies) designs high-reliability semiconductor solutions for automotive, industrial, and IoT applications, with expertise in nonvolatile memory and programmable systems.

CY15E004Q belongs to Cypress's automotive-qualified F-RAM product line, engineered specifically to replace serial EEPROM and flash in applications demanding extreme write endurance, zero-latency writes, and guaranteed data retention under harsh thermal conditions.

FAQ

Does CY15E004Q-SXAT require external high-voltage programming circuitry?

No. Unlike EEPROM or flash, the CY15E004Q-SXAT uses ferroelectric technology and writes at standard VDD (4.5–5.5 V) with no charge pumps or elevated voltages. All operations execute using only the SPI interface and supply rail-eliminating need for specialized programming hardware or voltage boosters.

Can CY15E004Q-SXAT be used as a direct hardware replacement for a 5 V SPI EEPROM?

Yes-pin-for-pin and command-set compatible with standard SPI EEPROMs (e.g., AT25xxx series) in 8-pin SOIC. It accepts identical opcodes (0x02/0x03/0x05/0x06), supports same SPI modes, and requires no firmware changes beyond disabling EEPROM-specific polling loops due to its NoDelay™ writes.

What is the impact of the documented WEL bit errata on system reliability?

The WEL bit remains set after writes to addresses 0x100–0x1FF, potentially causing unintended write enables in subsequent operations. Mitigation requires explicit WRDI instruction before each write sequence targeting those addresses-or restricting critical data to other address ranges where WEL clears normally.

Is HOLD functionality compatible with all microcontroller SPI peripherals?

HOLD works reliably only when the host asserts it while SCK is LOW, as specified in the datasheet. Some hardware SPI peripherals may not guarantee SCK low-state timing during interrupt service; in such cases, software-controlled CS toggling or dedicated GPIO-based HOLD management is recommended for deterministic suspension.