Renesas AT25SF641B-MHB-T

Overview

AT25SF641B-MHB-T from Renesas Electronics is a 64-Mbit SPI serial flash memory IC designed for code storage and execute-in-place (XiP) in embedded microcontrollers. It operates from a single 2.7–3.6 V supply, supports quad I/O (1-4-4) and dual I/O (1-2-2) read modes up to 133 MHz, delivers 104 MHz fast read performance, and features 4 kB/32 kB/64 kB block erase with typical times of 65 ms / 150 ms / 240 ms.

For engineers reviewing the AT25SF641B-MHB-T datasheet, AT25SF641B-MHB-T pinout, AT25SF641B-MHB-T application, or AT25SF641B-MHB-T equivalent, key selection criteria include XiP support via continuous quad-I/O read (0-4-4), OTP security registers, deep power-down current of 1 µA, JEDEC-standard SFDP compliance, and industrial temperature operation from –40 °C to +85 °C.

Technical Context

The AT25SF641B-MHB-T implements a flexible SPI interface supporting modes 0 and 3, with configurable dual-output (1-1-2), dual-I/O (1-2-2), quad-output (1-1-4), and quad-I/O (1-4-4, 0-4-4) command sets. Its memory array is organized into 2048 × 4-kbyte blocks, enabling granular erasure for mixed code/data layouts.

Internal control logic integrates write protection via WP pin and status register bits (SRP0/SRP1), erase/program suspend/resume capability, and three 256-byte one-time programmable (OTP) security registers. The device uses a dedicated SRAM data buffer and Y-gating architecture to enable high-speed sequential reads without address retransmission in wrap mode.

Key Specifications

Pinout & Package

AT25SF641B-MHB-T is packaged in an 8-pad, 5 × 6 × 0.6 mm DFN (Dual Flat No-lead) package with wettable flanks, RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial flash memory applications.

Compared with W25Q64JW-QI and MT25QL064ABA8ESF-0SIT, the AT25SF641B-MHB-T offers identical density and endurance but distinguishes itself with native 0-4-4 continuous read mode for lower latency XiP and unified SFDP v1.6 parameter structure simplifying cross-platform driver development.

Availability

AT25SF641B-MHB-T is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS modules, and IoT edge nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for AT25SF641B-MHB-T 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.

The AT25SF641B belongs to Renesas' high-performance serial flash product line, engineered specifically for execute-in-place (XiP) applications demanding low-latency code fetch, robust security, and industrial-grade reliability.

FAQ

What is the maximum clock frequency supported by the AT25SF641B-MHB-T in quad-I/O mode?

The AT25SF641B-MHB-T supports a maximum clock frequency of 133 MHz in quad-I/O mode, enabling high-bandwidth data transfer for execute-in-place applications. This specification is validated under industrial temperature conditions (–40 °C to +85 °C) and 2.7–3.6 V supply, with timing margins compliant to JEDEC AC characteristics. The AT25SF641B-MHB-T achieves this using optimized internal gating and low-capacitance DFN packaging.

Does the AT25SF641B-MHB-T support execute-in-place (XiP) operation, and how is it implemented?

Yes, the AT25SF641B-MHB-T supports execute-in-place (XiP) via its 0-4-4 quad-I/O continuous read command (EBh), which eliminates opcode retransmission and enables seamless instruction streaming. This mode leverages the device's internal address wrap logic and SRAM buffer to sustain burst reads without host intervention. The AT25SF641B-MHB-T is explicitly qualified for XiP in Renesas' datasheet Section 1 and Figure 12 timing diagrams.

How many one-time programmable (OTP) security registers does the AT25SF641B-MHB-T include, and what is their size?

The AT25SF641B-MHB-T includes three 256-byte one-time programmable (OTP) security registers, accessible via dedicated commands (42h/44h/48h). Each register is individually erasable and programmable, providing immutable storage for cryptographic keys, unique identifiers, or calibration data. These registers are physically isolated from main memory and retain data for 20 years per JEDEC JESD22-A117.

What package type is used for the AT25SF641B-MHB-T, and what are its key mechanical features?

The AT25SF641B-MHB-T uses an 8-pad, 5 × 6 × 0.6 mm DFN package with wettable flanks, specified in Renesas' Ordering Information (Section 15.2). It features a lead-free, halogen-free, RoHS-compliant construction and exposes the die pad on the bottom for enhanced thermal dissipation. The MHB-T suffix denotes this exact DFN variant with tape-and-reel packaging for automated assembly.

Can the AT25SF641B-MHB-T be used with standard SPI controllers that do not support quad-I/O commands?

Yes, the AT25SF641B-MHB-T is fully backward-compatible with standard SPI controllers via single-I/O (1-1-1) and dual-output (1-1-2) modes. It supports SPI modes 0 and 3, standard opcodes (03h, 0Bh), and requires no hardware modification. Quad-I/O functionality is enabled only when the QE bit in Status Register 2 is set, allowing gradual migration from legacy to high-speed interfaces. The AT25SF641B-MHB-T maintains full command compatibility across all modes.