Infineon Technologies CY15B128Q-SXE

Overview

CY15B128Q-SXE from Infineon Technologies (formerly Cypress) is a 128-Kbit (16K × 8) automotive-grade serial SPI F-RAM with NoDelay™ writes, 10¹³ read/write endurance, and 121-year data retention. It operates from 2.7 V to 3.6 V across –40 °C to +125 °C, packaged in an 8-pin SOIC, and serves as a hardware drop-in replacement for serial flash/EEPROM in high-cycle logging and real-time control systems.

For engineers reviewing the CY15B128Q-SXE datasheet, CY15B128Q-SXE pinout, CY15B128Q-SXE application, or CY15B128Q-SXE equivalent, key selection criteria include SPI mode 0/3 compatibility, WP/HOLD pin behavior, 33-MHz max clock timing, sleep-mode current (12 µA), and AEC-Q100 Grade 1 qualification for automotive embedded memory subsystems.

Technical Context

The CY15B128Q-SXE implements a ferroelectric memory array accessed via standard SPI protocol with zero-write-latency architecture - eliminating polling and enabling immediate bus turnaround after each byte write. Its internal status register controls software block protection (1/4, 1/2, or full array) and write-enable latch state.

It supports dual SPI modes (0 and 3), uses rising-edge input sampling and falling-edge output driving on SCK, and integrates dedicated hardware write protection via the active-low WP pin - independent of status register settings when WPEN = 1. The HOLD pin suspends ongoing transfers without clock or CS dependency, provided transitions occur while SCK is low.

Key Specifications

Pinout & Package

8-pin Small Outline Integrated Circuit (SOIC) package, surface-mount, RoHS-compliant, with 1.27 mm pitch and standard JEDEC MS-012AC footprint.

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-SSH-T, CY15B128Q-SXE uniquely balances AEC-Q100 Grade 1 compliance, 10¹³ endurance, and zero-write-latency - making it the only choice for automotive applications demanding both reliability and real-time write determinism.

Availability

CY15B128Q-SXE is available at Aetrix Electronics and suitable for telematics data loggers, ADAS event recorders, engine control unit calibration stores, and infotainment system settings retention requiring stable component supply across automotive production lifecycles.

Supply support for CY15B128Q-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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive microcontrollers, and memory solutions for mission-critical systems.

CY15B128Q-SXE belongs to Infineon's automotive-qualified F-RAM product line, engineered specifically for high-reliability, high-endurance nonvolatile storage in harsh-temperature environments where flash and EEPROM fail under frequent write stress.

FAQ

Is CY15B128Q-SXE pin-compatible with standard SPI EEPROMs like AT25xxx series?

Yes - CY15B128Q-SXE uses identical 8-pin SOIC packaging and SPI command set (WREN, WRDI, RDSR, WRSR, READ, WRITE) with same pin functions (CS, SCK, SI, SO, WP, HOLD, VDD, VSS). It requires no PCB redesign when replacing AT25080A or similar EEPROMs, though WP and HOLD pin behavior differs slightly in default state and protection scope.

Does CY15B128Q-SXE require external high-voltage programming circuitry?

No - unlike EEPROM and flash, CY15B128Q-SXE performs all writes at standard VDD (2.7–3.6 V) with no charge pump or elevated voltage generation. This eliminates external components, reduces EMI, and simplifies layout - especially critical in space-constrained automotive modules.

How does the HOLD pin behave during an active write operation?

When HOLD is pulled LOW during any memory operation (read, write, or status access), the device immediately suspends data transfer, holds SCK and SI/SO states, and enters a frozen state. The operation resumes from the exact bit position when HOLD returns HIGH - provided SCK remains LOW during the transition, per datasheet timing requirement.

What is the impact of disabling the WP pin (tied to VDD) on write protection functionality?

With WP tied to VDD, hardware write protection is inactive - status register and memory array writes are controlled solely by software (WREN instruction and status register WPEN bit). This configuration allows full flexibility for field updates but requires robust firmware-level protection to prevent accidental corruption during debug or OTA operations.