Nexperia USA Inc. S25FL256SDSMFB000

Overview

S25FL256SDSMFB000 from Cypress Semiconductor (now Infineon) is a 256-Mbit serial NOR flash memory with Quad SPI interface, 133 MHz clock frequency, uniform 256-byte programmable sectors, and 100K program/erase cycles endurance. It operates across industrial temperature range (–40°C to +85°C) and supports XIP (execute-in-place) for embedded boot code storage in microcontroller-based systems.

For engineers reviewing the S25FL256SDSMFB000 datasheet, S25FL256SDSMFB000 pinout, S25FL256SDSMFB000 application, or S25FL256SDSMFB000 equivalent, key selection criteria include Quad SPI timing compliance, sector protection granularity, write suspend/resume capability, V_CC operating range (2.7–3.6 V), and JEDEC JESD216B SFDP register support for auto-configuration.

Technical Context

This device implements a standard Serial Peripheral Interface (SPI) with extended Quad I/O mode (QPI), enabling 4-bit data transfers per clock cycle. It uses a 32-bit address space with 256-byte erase sectors and 256-byte page programming, supporting both volatile and non-volatile status register configuration.

The memory includes hardware write protection via WP# pin and software-controlled block protection (BP0–BP2 bits), plus deep power-down mode consuming <10 µA. It complies with JEDEC JESD216B for Serial Flash Discoverable Parameters, allowing host controllers to auto-detect configuration without hard-coded parameters.

Key Specifications

Pinout & Package

8-pin SOIC (208-mil) package with standard SPI pinout and dedicated Write Protect (WP#) and Hold (HOLD#) control signals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial NOR flash memory applications.

Compared with MX25L25645GMI-10G and W25Q256JVSIM, S25FL256SDSMFB000 uniquely combines JESD216B SFDP v1.6+, write suspend/resume, and industrial temperature qualification-enabling robust, auto-configurable firmware storage in safety-critical and field-upgradable systems.

Availability

S25FL256SDSMFB000 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU boot code, and medical diagnostic imaging UI requiring stable component supply and long-term lifecycle assurance.

Supply support for S25FL256SDSMFB000 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 acquired Cypress Semiconductor in 2020 and maintains its high-reliability serial flash portfolio for industrial and automotive markets.

S25FL256SDSMFB000 belongs to the Semper™ family of NOR flash devices, engineered specifically for mission-critical firmware storage where data integrity, fast random read, and field upgradeability are mandatory.

FAQ

Does S25FL256SDSMFB000 support Execute-in-Place (XIP) operation?

Yes. The device supports true XIP mode via Quad SPI interface, allowing microcontrollers to execute code directly from flash without copying to RAM. This reduces system memory footprint and startup latency, and is validated across ARM Cortex-M and RISC-V platforms with appropriate cache and prefetch configuration.

What is the minimum erase block size and how does it impact firmware updates?

The minimum erase block size is 256 bytes - a uniform sector size across the entire 32 MB array. This enables precise, low-overhead firmware patching: only modified sectors need erasure, avoiding full-chip erase delays and minimizing wear on unaffected regions during iterative field updates.

Is hardware write protection implemented solely through the WP# pin?

No. Hardware write protection is implemented via the WP# pin, but software-controlled protection is also available using BP0–BP2 bits in the status register to lock individual 64 KB blocks or the entire array. Both mechanisms can be used concurrently for layered security in safety-critical applications.

How does the Deep Power-Down mode affect wake-up time and recovery behavior?

In Deep Power-Down mode, supply current drops below 10 µA and the internal oscillator stops. Wake-up requires CS# deassertion followed by a 3 µs delay before the first command; no reset sequence is needed. Recovery is deterministic and documented in the datasheet's timing diagram T_DPD, ensuring predictable low-power exit in battery-constrained systems.