Nexperia USA Inc. S25FL256SAGMFB000

Overview

S25FL256SAGMFB000 from Cypress Semiconductor (now Infineon) is a 256-Mbit serial NOR flash memory with quad SPI interface, 133 MHz clock frequency, and 3.0–3.6 V supply voltage. It supports XIP (execute-in-place), uniform 4-KB sectors, and hardware reset protection-used in industrial HMIs, network router firmware storage, and automotive infotainment boot code retention.

For engineers reviewing the S25FL256SAGMFB000 datasheet, S25FL256SAGMFB000 pinout, S25FL256SAGMFB000 application, or S25FL256SAGMFB000 equivalent, key selection criteria include sector erase granularity, write-protect configuration mode, deep power-down current (10 µA), and JEDEC JESD216-compliant SFDP register support.

Technical Context

This device implements a standard SPI-compatible command set extended for Quad I/O operation, enabling 4-bit data transfers per clock cycle. It features a 256-byte page programming buffer, configurable write protection via status register bits WPEN and SRP, and a dedicated RESET# pin for hardware-initiated recovery.

The memory array is organized as 512 pages per sector × 512 sectors, supporting both individual sector erase (4-KB) and bulk chip erase. The SFDP v1.6 header provides dynamic read parameters including fast-read latency and dummy cycle count for 1S-1S-4S and 4S-4S-4S modes.

Key Specifications

Pinout & Package

8-pin SOIC (208-mil) package with standard SPI pin assignment and dedicated RESET# input.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S25FL256SAGMFB000, the S25FL256SAGNFB000 offers identical functionality in a smaller package, while MX25L25645GZC-13G trades advanced features (SFDP, OTP, 133 MHz) for lower unit cost-making it viable only in non-safety-critical applications.

Availability

S25FL256SAGMFB000 is available at Aetrix Electronics and suitable for industrial HMIs, automotive infotainment systems, and network infrastructure equipment requiring stable component supply across multi-year production cycles.

Supply support for S25FL256SAGMFB000 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 memory portfolio for mission-critical applications.

This part belongs to the Semper™ family of automotive-qualified serial NOR flash devices, designed specifically for functional safety compliance (ISO 26262 ASIL-B) and long-term data retention in harsh environments.

FAQ

What is the maximum clock frequency supported in Quad I/O read mode?

The S25FL256SAGMFB000 supports up to 133 MHz in Quad I/O read mode, delivering an effective data rate of 532 MB/s. This timing is validated under 3.0–3.6 V supply and -40°C to +105°C operating temperature range, with 6 dummy cycles specified in SFDP for reliable setup/hold margin.

Does this device support execute-in-place (XIP) operation?

Yes, the S25FL256SAGMFB000 supports true XIP operation via its continuous read mode with wrap-around addressing. The device outputs sequential data without requiring repeated command issuance, enabling direct CPU instruction fetch from flash memory in microcontroller-based systems.

How many times can the One-Time Programmable (OTP) security registers be written?

The OTP security registers consist of four 256-bit rows that can be permanently programmed once per row. Programming is irreversible and requires VCC ≥3.3 V and execution of specific unlock/write/lock sequences defined in the datasheet; no row may be reprogrammed after initial write completion.

Is hardware reset protection active during power-up sequencing?

Yes, hardware reset protection is active from VCC ≥1.5 V until RESET# is deasserted, preventing spurious commands during power ramp-up. The internal power-on reset (POR) circuit holds the device in reset state until VCC stabilizes above 2.7 V and RESET# is sampled high for ≥20 ns.