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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Infineon Technologies CY15B128Q-SXA

Name: CY15B128Q-SXA
Brand: Infineon Technologies
SKU: CY15B128Q-SXA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY15B128Q-SXA

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: CY15B128Q-SXA.pdf

Description:: IC FRAM 128KBIT SPI 40MHZ 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

CY15B128Q-SXA from Cypress Semiconductor is an automotive-grade 128-Kbit (16K × 8) serial SPI F-RAM nonvolatile memory with NoDelay™ write capability, 10¹⁴ read/write endurance, and 151-year data retention. It operates from 2.0 V to 3.6 V across –40 °C to +85 °C, supports 40-MHz SPI bus speed in modes 0 and 3, and serves as a hardware drop-in replacement for serial EEPROM and flash in data-logging and industrial control systems.

For engineers reviewing the CY15B128Q-SXA datasheet, CY15B128Q-SXA pinout, CY15B128Q-SXA application, or CY15B128Q-SXA equivalent, key selection criteria include write-cycle endurance, zero-write-delay timing behavior, SPI mode compatibility, automotive temperature compliance, and hardware-level write protection via WP pin and status register.

Technical Context

The CY15B128Q-SXA implements ferroelectric RAM technology to eliminate write latency-data commits immediately after each byte transfer without polling or erase cycles. Its 14-bit address space maps to 16K × 8 logical organization, with upper two address bits ignored but recommended as zero for future density scalability.

It functions as an SPI slave supporting Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), latching inputs on rising SCK edges and driving outputs on falling edges. The device integrates a 3-bit nonvolatile status register controlling block protection, write-enable latch, and WPEN bit for hardware write lock of the status register itself.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	128 Kbit (16,384 × 8), enabling byte-level writes without page/sector erase overhead
Endurance	10¹⁴ read/write cycles - supports continuous logging at 100 Hz for >31 years without wear-out
Data Retention	151 years at +85 °C - eliminates periodic refresh or backup power requirements
SPI Speed	Up to 40 MHz - achieves ~4 MB/s effective write throughput with no wait states
Supply Voltage	2.0 V to 3.6 V - compatible with modern low-voltage microcontrollers and automotive power rails
Temperature Range	–40 °C to +85 °C (Automotive-A grade) - qualified for under-hood and chassis-mounted ECUs
Active Current	2.5 mA at 40 MHz - enables high-speed operation without thermal derating in compact layouts

Pinout & Package

Package: 8-pin Small Outline Integrated Circuit (SOIC), RoHS-compliant, surface-mountable with standard reflow profile.

Pin/Terminal	Circuit Role	Design Meaning
SCK	Serial Clock Input	Synchronizes all SPI transfers; rising edge latches SI, falling edge drives SO; supports 0–40 MHz with interruptible clock
CS	Chip Select Input	Active-low enable; device enters standby (150 µA) when HIGH; falling edge initiates opcode recognition
SI	Serial Input	Receives opcodes, addresses, and write data; sampled on rising SCK; must be driven to valid logic level
SO	Serial Output	Drives read data and status register contents on falling SCK; tristated when CS HIGH or HOLD LOW
WP	Write Protect Input	Hardware lock for status register when WPEN = 1; must be tied to VDD if unused to prevent accidental lockout
HOLD	Operation Suspend Input	Pauses ongoing read/write without losing internal state; transitions only allowed while SCK = LOW
VSS	Ground	Reference return path for all I/O and core logic; requires low-impedance connection to system ground plane
VDD	Power Supply	Primary supply input; decoupling capacitor (0.1 µF) required within 5 mm of pin for stable 40-MHz operation

Key Features

Feature	Design Value
NoDelay™ Write Architecture	Eliminates write latency and polling loops - next SPI transaction begins immediately after byte transfer completes
Ferroelectric Memory Core	Enables 10¹⁴ endurance and 151-year retention without charge-pump circuitry or wear-leveling firmware
Dual SPI Mode Support	Interoperates with legacy and new microcontrollers using either Mode 0 or Mode 3 timing without hardware modification
Three-Layer Write Protection	Combines hardware (WP pin), software (WREN/WRDI), and block-level (BP0/BP1 bits) controls to prevent unintended memory corruption
Device ID Readback	Manufacturer ID (0x01) and Product ID (0x59) accessible via RDID command - enables automated BOM validation and field firmware verification

Applications

Telematics Data Logger

Engine Control Unit (ECU)

Use Scenario: Continuous recording of GPS position, speed, acceleration, and fault codes during vehicle operation.

IC Role / Device Role / Timing Role: Nonvolatile storage for time-stamped event buffers with sub-millisecond write commit to avoid data loss during power interruption.

Use Value: 10¹⁴ endurance ensures >30 years of daily 10,000-event logging without degradation; NoDelay™ prevents gaps during burst capture.

Use Scenario: Storing adaptive learning parameters (fuel trim, ignition timing offsets) that update dynamically during engine runtime.

IC Role / Device Role / Timing Role: High-reliability parameter store interfaced directly to MCU's SPI peripheral, surviving frequent updates and cold cranking voltage dips.

Use Value: 2.0–3.6 V operation tolerates battery sag to 2.2 V; automotive temperature rating guarantees functionality at under-hood +85 °C.

Advanced Driver Assistance System (ADAS) Sensor Calibration

Electric Power Steering (EPS) Torque Map Storage

Use Scenario: Storing factory-calibrated sensor offsets and compensation coefficients for radar/camera fusion modules.

IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration memory accessed during boot and updated only during authorized service procedures.

Use Value: Hardware WP pin + BP bits prevent field overwrite; Device ID enables calibration authenticity check before loading.

Use Scenario: Holding torque assist maps optimized per vehicle variant and updated during dealer programming or OTA updates.

IC Role / Device Role / Timing Role: SPI-connected map storage with deterministic write timing to ensure map integrity during mid-operation updates.

Use Value: Zero-latency writes guarantee map reload completes within defined safety window; 151-year retention avoids recalibration over vehicle lifetime.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT25DF041A-SSH-T	4-Mbit SPI flash with 100k-cycle endurance, 20-ms page program time, no built-in write protection bits	Requires external firmware wear-leveling and polling; unsuitable for sub-millisecond write-critical logging	Select only if cost sensitivity outweighs write performance and endurance requirements
BR24G128FJ-WE2	128-Kbit I²C EEPROM with 1M-cycle endurance, 5-ms write cycle, VDD = 1.7–5.5 V, –40 °C to +105 °C	Slower interface (max 1 MHz), no HOLD/SO/SI separation, lacks SPI mode flexibility and Device ID	Prefer for space-constrained I²C designs where SPI is unavailable and write frequency is low

Compared with AT25DF041A-SSH-T and BR24G128FJ-WE2, the CY15B128Q-SXA delivers 100 million× higher endurance, eliminates write latency entirely, and provides hardware-enforced block protection - making it uniquely suited for automotive applications demanding real-time, high-frequency nonvolatile storage.

Availability

CY15B128Q-SXA is available at Aetrix Electronics and suitable for telematics data loggers, engine control units, ADAS calibration storage, and electric power steering torque map retention requiring stable component supply across automotive production lifecycles.

Supply support for CY15B128Q-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 expertise in nonvolatile memory and programmable systems.

The CY15B128Q-SXA belongs to Cypress's automotive F-RAM product line, engineered specifically to replace serial flash and EEPROM in safety-critical, high-write-frequency automotive subsystems where data integrity and timing determinism are mandatory.

FAQ

Is CY15B128Q-SXA pin-compatible with standard 8-pin SOIC SPI flash or EEPROM devices?

Yes - CY15B128Q-SXA uses identical 8-pin SOIC footprint and SPI signal mapping (CS, SCK, SI, SO, WP, HOLD, VDD, VSS). It supports same PCB layout and routing as common serial flash/EEPROM, enabling direct hardware replacement without board redesign.

Does CY15B128Q-SXA require special initialization or firmware changes when replacing EEPROM?

No - it accepts standard SPI opcodes (0x03 Read, 0x02 Write, 0x06 WREN, etc.) and responds identically to legacy EEPROM commands. Only firmware polling loops can be removed due to NoDelay™ writes, simplifying driver code and reducing CPU load.

How does the HOLD pin function during active memory operations?

HOLD suspends ongoing read or write transfers without resetting internal state. When pulled LOW while SCK is LOW, the device halts communication, tristates SO, and ignores further SCK/CS activity until HOLD returns HIGH - enabling safe CPU context switching in real-time systems.

What is the role of the WP pin when WPEN bit is set in the status register?

When WPEN = 1, the WP pin becomes active-low protection for the status register only - writing to BP0/BP1 or WEL bits is blocked even if WREN is issued. This prevents accidental disabling of block protection or status register corruption, enhancing functional safety in automotive deployments.

CY15B128Q-SXA Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: F-RAM™

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: FRAM

Technology:: FRAM (Ferroelectric RAM)

Memory Size:: 128Kbit

Memory Organization:: 16K x 8

Memory Interface:: SPI

Clock Frequency:: 40 MHz

Write Cycle Time - Word, Page:: -

Access Time:: -

Voltage - Supply:: 2V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

CY15B128Q-SXA FAQ

1.How can I place an order for CY15B128Q-SXA through Aetrix?

Please submit a Request for Quotation (RFQ) for CY15B128Q-SXA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CY15B128Q-SXA reliable?

The price and inventory of CY15B128Q-SXA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY15B128Q-SXA is usually 5 days.

3.What payment methods are accepted for CY15B128Q-SXA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY15B128Q-SXA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY15B128Q-SXA?

CY15B128Q-SXA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY15B128Q-SXA order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CY15B128Q-SXA?

For technical support, including CY15B128Q-SXA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY15B128Q-SXA requirements.

6.How does Aetrix verify that CY15B128Q-SXA is sourced from the original manufacturer or authorized distributors?

All CY15B128Q-SXA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY15B128Q-SXA meets industry standards.

7.What is the process for return or replacement of CY15B128Q-SXA?

All CY15B128Q-SXA units undergo pre-shipment inspection (PSI). If there is an issue with CY15B128Q-SXA, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CY15B128Q-SXA part is unused and in its original packaging.

Return procedure for CY15B128Q-SXA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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