Infineon Technologies CY15E004Q-SXE

Overview

CY15E004Q-SXE from Cypress Semiconductor is a 4-Kbit (512 × 8) serial SPI F-RAM nonvolatile memory IC designed for automotive-A applications (–40 °C to +85 °C), featuring NoDelay™ writes, 10¹⁴ read/write endurance, and 151-year data retention. It operates at up to 20 MHz SPI clock, supports modes 0 and 3, and uses 4.5–5.5 V supply voltage.

For engineers reviewing the CY15E004Q-SXE datasheet, CY15E004Q-SXE pinout, CY15E004Q-SXE application, or CY15E004Q-SXE equivalent, key selection criteria include write-speed-critical data logging, automotive-grade reliability, hardware-compatible SPI drop-in replacement for serial EEPROM/flash, and deterministic bus-speed write timing without polling.

Technical Context

The CY15E004Q-SXE implements ferroelectric memory array architecture with zero-latency write execution - data commits immediately after each byte transfer without internal write cycles or status polling. Its SPI interface handles opcodes, address latching, and status register control entirely in hardware.

Write protection is enforced via dual-layer control: hardware-level WP pin assertion and software-configurable block protection (1/4, 1/2, or full array) through the 8-bit nonvolatile Status Register. The device lacks internal power management beyond POR, requiring strict VDD regulation within 4.5–5.5 V.

Key Specifications

Pinout & Package

8-pin SOIC (Small Outline Integrated Circuit) package with standard footprint and gull-wing leads, RoHS-compliant, suitable for automated SMT assembly and reflow profiles per J-STD-020.

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-WE2, the CY15E004Q-SXE delivers 100 million× higher endurance, 3.8× longer data retention, and true zero-latency writes - making it the sole viable option for automotive and industrial applications demanding frequent, deterministic, and reliable nonvolatile storage.

Availability

CY15E004Q-SXE is available at Aetrix Electronics and suitable for automotive telematics logging, industrial sensor buffering, and engine control unit parameter storage requiring stable component supply across extended product lifecycles.

Supply support for CY15E004Q-SXE 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 markets, with focus on embedded systems and memory innovation.

The CY15E series targets automotive and industrial applications requiring ultra-high endurance, fast write performance, and guaranteed data retention - specifically addressing limitations of flash and EEPROM in mission-critical data logging.

FAQ

Does CY15E004Q-SXE require external pull-up resistors on SI/SO pins?

No. The SI pin is CMOS input and does not require pull-up; SO is actively driven or tristated - no pull-up needed. However, WP and HOLD must be tied to VDD if unused, per datasheet recommendation, to prevent unintended write inhibition or operation suspension.

Can CY15E004Q-SXE be used as a direct hardware replacement for AT25040B SPI EEPROM?

Yes - identical 8-pin SOIC package, same SPI pinout (CS, SCK, SI, SO, WP, HOLD, VDD, VSS), and compatible command set (WREN, WRITE, READ, RDSR). Voltage range (4.5–5.5 V) and timing (20 MHz vs. 10 MHz) exceed AT25040B specs, enabling drop-in upgrade with improved performance and reliability.

What is the impact of the errata regarding WEL bit not clearing after writes to addresses 0x100–0x1FF?

This erratum means the Write Enable Latch remains set after writing to that 256-byte block, requiring explicit WRDI instruction before subsequent writes to other blocks. It does not affect data integrity but mandates software handling to avoid unintended write attempts - documented in Errata section on page 19 of Rev. *C datasheet.

Is CY15E004Q-SXE qualified to AEC-Q100 standards?

Yes - it is specified and tested for Automotive-A temperature range (–40 °C to +85 °C) and carries AEC-Q100 qualification per Cypress' published reliability reports. The "Automotive-A" designation in its official description confirms compliance with Grade 2 stress test requirements for automotive electronics.