Infineon Technologies CY15B004J-SXA

Overview

CY15B004J-SXA from Cypress Semiconductor is a 4-Kbit (512 × 8) serial I²C automotive-grade ferroelectric RAM (F-RAM) with 100 trillion (10¹⁴) read/write endurance, 151-year data retention, and NoDelay™ write capability at up to 1 MHz bus speed. It serves as nonvolatile memory in automotive control units requiring rapid, frequent data logging under –40 °C to +85 °C conditions.

For engineers reviewing the CY15B004J-SXA datasheet, CY15B004J-SXA pinout, CY15B004J-SXA application, or CY15B004J-SXA equivalent, key selection criteria include guaranteed automotive-A temperature operation, I²C drop-in compatibility with EEPROM, zero-write-delay timing, low active current (100 µA at 100 kHz), and WP-controlled hardware write protection.

Technical Context

The CY15B004J-SXA implements a true nonvolatile RAM architecture using ferroelectric capacitor-based memory cells, enabling byte-level writes without erase cycles or write latency. Its I²C interface supports standard-mode (100 kHz), fast-mode (400 kHz), and fast-mode plus (1 MHz) timing while maintaining full backward compatibility with legacy EEPROM command sequences.

Memory addressing uses a 9-bit scheme: 1 page-select bit (bit 8) combined with 8 word-address bits (bits 7–0), allowing access to all 512 bytes across two 256-byte pages. The device operates as a slave-only I²C peripheral with fixed 7-bit slave address prefix 1010b and user-configurable A2/A1 pins for multi-device bus arbitration.

Key Specifications

Pinout & Package

Package: 8-pin Small Outline Integrated Circuit (SOIC), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial I²C nonvolatile memory applications.

Compared with AT24C04C-SSHM-T, CY15B004J-SXA delivers 100 million× more endurance and eliminates write delays; versus FM24V04-G, it adds formal Automotive-A qualification and tighter voltage tolerance (2.7–3.65 V), making it suitable for safety-critical ECU deployments.

Availability

CY15B004J-SXA is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, and body control modules requiring stable component supply across extended automotive production lifecycles.

Supply support for CY15B004J-SXA 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 embedded systems and memory innovation.

The CY15B series targets automotive nonvolatile memory needs where EEPROM limitations-write latency, endurance, and power-impede real-time data capture and long-term reliability.

FAQ

Is CY15B004J-SXA pin-compatible with standard 4-Kbit I²C EEPROMs?

Yes. CY15B004J-SXA uses an 8-pin SOIC package with identical pinout (A1, A2, SDA, SCL, WP, VSS, VDD, NC) and I²C protocol timing as common 4-Kbit EEPROMs like AT24C04. No PCB redesign or firmware modification is needed for drop-in replacement.

Does CY15B004J-SXA require external pull-up resistors on SDA and SCL lines?

Yes. SDA and SCL are open-drain I²C bus lines and require external pull-up resistors to VDD. Recommended values are 2.2 kΩ for 100 kHz, 1 kΩ for 400 kHz, and 470 Ω for 1 MHz operation, sized per bus capacitance and rise-time requirements.

How does the WP pin function during power-up or brownout conditions?

The WP pin is internally pulled down. If left unconnected or grounded, writes are enabled. To ensure write protection during power transitions, WP must be actively driven to VDD *after* VDD stabilizes and *before* any I²C transaction begins - typically via MCU GPIO or dedicated power-good signal.

Can CY15B004J-SXA operate at 1.8 V?

No. CY15B004J-SXA is specified only for 2.7 V to 3.65 V operation. Attempting 1.8 V operation violates absolute maximum ratings and will result in undefined behavior, failed writes, or data corruption. For 1.8 V systems, consider Cypress's FM24V04-G (2.0–3.6 V) with industrial temperature grade.