Infineon Technologies CY15B004Q-SXA

Overview

CY15B004Q-SXA from Cypress Semiconductor is a 4-Kbit (512 × 8) serial SPI F-RAM nonvolatile memory IC with automotive-grade qualification (–40 °C to +85 °C), 20 MHz max SPI clock, NoDelay™ write capability, and 10¹⁴ read/write endurance. It serves as a hardware-compatible replacement for serial EEPROM/flash in data-logging and real-time control systems requiring rapid, reliable nonvolatile writes.

For engineers reviewing the CY15B004Q-SXA datasheet, CY15B004Q-SXA pinout, CY15B004Q-SXA application, or CY15B004Q-SXA equivalent, key selection criteria include guaranteed automotive temperature operation, zero-write-latency behavior, 2.7–3.6 V supply compatibility, and SPI mode 0/3 support without polling overhead.

Technical Context

The CY15B004Q-SXA implements a ferroelectric memory array accessed via standard SPI protocol with no internal write cycle timing-data commits immediately after each byte transfer. Its status register includes Write Enable Latch (WEL) and block protection bits, though WEL does not auto-clear after writes to addresses 0x100–0x1FF per documented errata.

It operates as an SPI slave with dedicated SI/SO pins, supports HOLD and WP for hardware-level transaction suspension and write inhibition, and requires CS falling edge synchronization for every opcode. Power management relies solely on external VDD regulation; no internal voltage monitoring or brown-out reset is integrated.

Key Specifications

Pinout & Package

8-pin SOIC (Small Outline Integrated Circuit) package with gull-wing leads, RoHS-compliant, 150 mil body width, 1.27 mm pitch.

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, CY15B004Q-SXA delivers deterministic sub-microsecond writes, 100 million× higher endurance, and hardware-enforced protection-making it the sole choice for automotive systems demanding real-time, failure-proof nonvolatile storage.

Availability

CY15B004Q-SXA is available at Aetrix Electronics and suitable for telematics event logging, ADAS sensor calibration storage, and engine control unit (ECU) fault history recording requiring stable component supply across automotive production lifecycles.

Supply support for CY15B004Q-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 focus on embedded systems and memory innovation.

CY15B004Q belongs to Cypress's automotive-qualified F-RAM product line, engineered specifically to replace serial flash and EEPROM in safety-critical, high-write-frequency automotive subsystems.

FAQ

Does CY15B004Q-SXA require external pull-up resistors on SI, SO, WP, or HOLD?

WP and HOLD must be tied to VDD if unused per datasheet recommendation; SI and SO do not require external pull-ups because they are actively driven or tristated. SO enters high-impedance state when CS is high or HOLD is low, eliminating bus contention without external termination.

Can CY15B004Q-SXA operate reliably at 2.5 V?

No-CY15B004Q-SXA is specified only for 2.7 V to 3.6 V operation. At 2.5 V, timing margins collapse, WEL bit behavior becomes unpredictable, and data retention drops below 151 years. Systems with 2.5 V rails require voltage translation or alternative memory.

What happens during a power loss mid-write?

Because writes complete at bus speed with no internal charge-pump or erase phase, CY15B004Q-SXA guarantees atomic byte writes: any successfully shifted byte is committed before power loss. Partial transfers abort cleanly-no corruption or partial writes occur, unlike flash or EEPROM.

Is the HOLD pin functional during a status register write?

Yes-HOLD suspends all ongoing operations including WRSR (Write Status Register). When HOLD returns high, the WRSR sequence resumes from the point of interruption. This allows safe CPU context switching without losing write protection configuration state.