Infineon Technologies S25FL204K0TMFI040

Overview

S25FL204K0TMFI040 from Cypress Semiconductor is a 4-Mbit (512 kB) 3.0 V serial NOR flash memory with SPI and Dual Output SPI interface, 85 MHz read clock rate, uniform 4-kbyte sector architecture, and industrial temperature range (–40°C to +85°C). It delivers fast code shadowing and parameter storage in microcontroller boot systems, IoT edge nodes, and industrial HMI firmware storage.

For engineers reviewing the S25FL204K0TMFI040 datasheet, S25FL204K0TMFI040 pinout, S25FL204K0TMFI040 application, or S25FL204K0TMFI040 equivalent, key selection criteria include 85 MHz Dual Output Read timing, hardware write protection via WP# and status register, 100k program/erase endurance, and SOIC-8 (150-mil) RoHS-compliant packaging for space-constrained embedded designs.

Technical Context

The S25FL204K0TMFI040 implements a uniform sector architecture with 128 × 4-kbyte sectors and 8 × 64-kbyte blocks, enabling granular firmware partitioning and over-the-air update management. Its dual-mode SPI supports both standard Mode 0/3 clocking and Fast Read Dual Output (3Bh command), where SI/IO0 becomes a second data output during reads-doubling effective throughput without requiring additional pins.

Internal control logic integrates JEDEC-standard manufacturer/device ID (90h/9Fh), status register polling (05h), and deep power-down mode (B9h) with 15 µA standby current. Erase operations are fully supported at sector (20h), block (D8h), and chip (C7h) levels, with typical times of 50 ms, 500 ms, and 3.5 s respectively-enabling deterministic firmware recovery sequences.

Key Specifications

Pinout & Package

8-pin SOIC (150-mil) package with gull-wing leads, Pb-free, RoHS-compliant, moisture sensitivity level (MSL) 3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q40EW and MX25L4006E, the S25FL204K0TMFI040 uniquely balances 85 MHz Dual Output Read, 100k endurance, and full 3.3 V SPI pin compatibility - making it optimal for upgrade paths from legacy Spansion designs and real-time boot-critical systems.

Availability

S25FL204K0TMFI040 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge node boot code, medical device configuration memory, and automotive body control module log storage requiring stable component supply and long-term lifecycle support.

Supply support for S25FL204K0TMFI040 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 embedded memory and programmable solutions, founded in 1982 and headquartered in San Jose, CA.

The S25FL family was developed specifically for reliable, high-speed SPI flash applications in automotive, industrial, and networking systems - emphasizing robustness, long data retention, and seamless integration with microcontroller boot engines.

FAQ

Does S25FL204K0TMFI040 support Quad SPI mode?

No. The S25FL204K0TMFI040 supports only Standard SPI (4-wire) and Dual Output SPI (using SI/IO0 and SO simultaneously). It does not implement Quad SPI (QSPI) commands or 4-bit data bus operation. Dual Output Read (3Bh) provides double the bandwidth of standard SPI without requiring additional pins or host controller QSPI peripheral support.

What is the maximum clock frequency for page programming?

The S25FL204K0TMFI040 does not use the SPI clock for timing internal programming operations. Page Program (02h) executes internally with a typical duration of 1.5 ms, independent of SCK frequency. The host must poll the status register (05h) or wait the specified time before issuing subsequent commands - no clock stretching or dynamic frequency adjustment is required.

Can HOLD# be asserted during an erase or program cycle?

Yes. Asserting HOLD# during an active erase or program cycle pauses the SPI interface but does not interrupt the internal operation. The device continues the erase/program sequence transparently. Once HOLD# is deasserted and CS# remains low, the host may resume communication - the status register will reflect ongoing operation until completion.

Is the SOIC-150-mil package of S25FL204K0TMFI040 compatible with SOIC-208-mil footprints?

No. The SOIC-150-mil (SOA008) package has 0.150-inch body width and 0.050-inch lead pitch, while SOIC-208-mil (SOC008) has 0.208-inch body width and same pitch. They are mechanically incompatible - PCB land patterns, stencil apertures, and pick-and-place tooling differ. S25FL204K0TMFI040 is marked "04" in ordering code, explicitly denoting the 150-mil variant.