Infineon Technologies S25FL204K0TMFI043

Overview

S25FL204K0TMFI043 from Cypress Semiconductor is a 4-Mbit (512 kB) 3.0 V SPI Flash memory with uniform 4-kbyte sectors and 64-kbyte blocks, supporting standard and dual-output SPI up to 85 MHz, 256-byte page programming, and industrial temperature range (–40°C to +85°C) in an 8-pin SOIC 150-mil package. It serves as nonvolatile code/data storage in microcontroller boot systems, firmware update buffers, and configuration parameter retention.

For engineers reviewing the S25FL204K0TMFI043 datasheet, S25FL204K0TMFI043 pinout, S25FL204K0TMFI043 application, or S25FL204K0TMFI043 equivalent, key selection considerations include 85 MHz dual-output read performance, hardware write protection via WP# and HOLD#, sector/block erase granularity, and RoHS-compliant 8-pin SOIC packaging for space-constrained embedded designs.

Technical Context

The S25FL204K0TMFI043 implements a uniform flash architecture with 128 erasable 4-kB sectors and 8 erasable 64-kB blocks, enabling fine-grained firmware partitioning and robust field updates. Its dual-output SPI mode (3Bh command) uses SI/IO0 and SO simultaneously for 2× data throughput versus standard SPI, accelerating code shadowing during boot.

It supports JEDEC-standard manufacturer/device ID reads (90h, 9Fh), status register polling during erase/program cycles, and flexible write protection combining software-configurable BP bits with hardware WP# pin control - all operating within a single 2.7–3.6 V supply without voltage translation.

Key Specifications

Pinout & Package

8-pin SOIC (150-mil) package with gull-wing leads, Pb-free and RoHS compliant. Pinout validated per Cypress Document 002-00722 Rev. *H Figure 2.1 and Table 3.1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPI Flash memory applications.

Compared with S25FL204K0TMFI043, the 208-mil variant offers mechanical robustness at the cost of PCB area, while the Macronix alternative trades dual-output capability for raw clock speed - making the original optimal for balanced boot performance and layout efficiency.

Availability

S25FL204K0TMFI043 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU boot code, and medical device configuration requiring stable component supply across extended product lifecycles.

Supply support for S25FL204K0TMFI043 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 since 2020) is a leader in high-performance, reliable embedded memory and programmable solutions for automotive, industrial, and consumer systems.

The S25FL family delivers 3.0 V-only SPI flash optimized for code execution, firmware updates, and parameter storage in resource-constrained microcontroller-based systems - emphasizing endurance, security, and seamless integration.

FAQ

What SPI modes does the S25FL204K0TMFI043 support?

The device supports SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). In both modes, data is latched on the rising edge of SCK and output on the falling edge. The difference lies only in idle SCK polarity - low in Mode 0, high in Mode 3 - ensuring compatibility with most ARM, RISC-V, and legacy MCU SPI peripherals without protocol translation.

Can the S25FL204K0TMFI043 be used for execute-in-place (XIP) applications?

No - it does not support true XIP. While dual-output read (3Bh) accelerates code loading into RAM for shadow execution, the device lacks address bus and random-access timing required for direct instruction fetch. It is designed for sequential read-heavy use cases like boot loading and firmware staging, not real-time instruction execution from flash.

How does hardware write protection interact with software BP bits?

WP# pin controls write access to the status register only. When WP# is low, all status register writes (including BP0–BP3 and SRP bits) are blocked regardless of current BP settings. This creates a hierarchical protection scheme: hardware lock prevents accidental register changes, while software BP bits define which memory regions remain writable when WP# is high.

Is deep power-down mode supported, and how is it exited?

Yes - the Deep Power-down (DP, B9h) command reduces current to 1 µA typical. Exit requires Release Deep Power-down / Device ID (ABh) command with CS# held low for ≥20 ns after ABh transmission. No clock is needed during entry/exit; the device automatically resumes normal operation upon successful ABh execution, retaining all memory contents.