Infineon Technologies CY15B004Q-SXET

Overview

CY15B004Q-SXET from Cypress Semiconductor is a 4-Kbit (512 × 8) serial SPI F-RAM nonvolatile memory IC designed for automotive-A applications. It delivers NoDelay™ writes, 100 trillion (10¹⁴) read/write endurance, 151-year data retention, and operates at up to 20 MHz SPI clock speed across –40 °C to +85 °C. It serves as a hardware drop-in replacement for serial EEPROM and flash in real-time data logging systems.

For engineers reviewing the CY15B004Q-SXET datasheet, CY15B004Q-SXET pinout, CY15B004Q-SXET application, or CY15B004Q-SXET equivalent, key selection criteria include write-cycle speed without polling, automotive-grade temperature compliance, SPI mode 0/3 compatibility, WP/HOLD pin behavior, and SOIC-8 package integration into space-constrained control modules.

Technical Context

The CY15B004Q-SXET implements a ferroelectric memory array with zero-latency write architecture: data commits immediately upon byte transfer completion, eliminating write-ready polling. Its internal status register includes WEL and block protection bits, and errata confirms persistent WEL bit behavior after writes to addresses 0x100–0x1FF.

It functions as an SPI slave supporting modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), with inputs latched on SCK rising edge and outputs driven on falling edge. All I/O timing is guaranteed over VDD = 2.7 V to 3.6 V and full automotive-A temperature range.

Key Specifications

Pinout & Package

Package: 8-pin Small Outline Integrated Circuit (SOIC), RoHS-compliant, 150 mil width.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FM25V05-G and AT25DF041A-MAU-T, the CY15B004Q-SXET uniquely balances automotive qualification, zero-write-latency operation, and robust 8-pin SOIC integration-making it optimal for safety-critical, high-cycle-rate automotive memory tasks where reliability and determinism outweigh raw density or speed.

Availability

CY15B004Q-SXET is available at Aetrix Electronics and suitable for telematics event logging, engine control unit (ECU) parameter storage, and ADAS camera module settings requiring stable component supply across extended automotive production lifecycles.

Supply support for CY15B004Q-SXET 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 emphasis on memory, PSoC, and connectivity.

The CY15B004Q 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 CY15B004Q-SXET require write polling during SPI transactions?

No. The CY15B004Q-SXET performs NoDelay™ writes: each byte is committed to memory immediately upon successful SPI transfer, and the next instruction may begin without checking status. This eliminates polling loops and guarantees deterministic timing for time-critical logging.

What is the functional impact of the WEL bit errata on addresses 0x100–0x1FF?

The Write Enable Latch (WEL) bit in the status register remains set after WRITE operations to memory locations 0x100–0x1FF and does not auto-clear. Software must explicitly issue WRDI before subsequent writes to avoid unintended write protection activation.

Can the SI and SO pins be shorted for 3-wire SPI interface?

Yes. The datasheet permits connecting SI and SO together (with appropriate series resistor and level-shifting if needed) to implement a shared data line, reducing MCU pin count. HOLD and WP must be tied to VDD in this configuration per design guidelines.

Is CY15B004Q-SXET pin-compatible with standard SPI EEPROMs like AT25040?

Yes-CY15B004Q-SXET uses identical 8-pin SOIC pinout and SPI command set (including WREN, WRITE, READ, RDSR) as common 4-Kbit SPI EEPROMs, enabling direct PCB-level replacement without layout changes or firmware rework.