Renesas AT25SF081B-SSHD-T

Overview

AT25SF081B-SSHD-T from Renesas Electronics is an 8 M-bit SPI serial flash memory IC supporting dual I/O and quad I/O operations, with 108 MHz max clock frequency, 2.7–3.6 V supply, and execute-in-place (XiP) capability for embedded boot and code storage applications.

For engineers reviewing the AT25SF081B-SSHD-T datasheet, AT25SF081B-SSHD-T pinout, AT25SF081B-SSHD-T application, or AT25SF081B-SSHD-T equivalent, key selection criteria include quad-SPI timing compliance, 4 kB sector erase time (60 ms typ), OTP security register support, deep power-down current (1.2 µA typ), and SOIC-8 (208-mil wide) package compatibility.

Technical Context

The AT25SF081B-SSHD-T implements a flexible SPI interface compliant with modes 0 and 3, enabling fast read via 1-1-4 (quad output), 1-4-4 (quad I/O), and 0-4-4 (continuous quad I/O) command formats. Its internal architecture includes SRAM data buffer, Y/X decoders, and control logic supporting suspend/resume during program/erase cycles.

Memory protection is enforced through non-volatile status register bits (SRP0/SRP1) and hardware WP pin assertion, while three 256-byte OTP security registers provide immutable device identity and firmware integrity storage. SFDP register enables standardized parameter discovery by host controllers.

Key Specifications

Pinout & Package

AT25SF081B-SSHD-T is packaged in an 8-lead, 208-mil wide EIAJ SOIC (JEDEC MS-012AC) with standard pin pitch and gull-wing leads. This RoHS-compliant green package supports reflow soldering and offers mechanical robustness for automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q80DVSSIG and MX25L8006EM2I-12G, the AT25SF081B-SSHD-T delivers superior XiP performance via 0-4-4 mode, lower deep power-down current (1.2 µA), and integrated OTP security-making it optimal for secure, low-latency, and energy-constrained embedded systems.

Availability

AT25SF081B-SSHD-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge device boot memory, and automotive infotainment HMI requiring stable component supply across multi-year production cycles.

Supply support for AT25SF081B-SSHD-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 AT25SF081B-SSHD-T belongs to Renesas' AT25SF family of SPI flash memories engineered specifically for execute-in-place (XiP) boot and secure firmware storage in resource-constrained embedded systems.

FAQ

What is the maximum SPI clock frequency supported by the AT25SF081B-SSHD-T?

The AT25SF081B-SSHD-T supports a maximum SPI clock frequency of 108 MHz in quad I/O (1-4-4) and continuous quad I/O (0-4-4) modes. This enables high-bandwidth data transfers essential for execute-in-place (XiP) applications. The actual achievable frequency depends on PCB layout, signal integrity, and host controller capabilities - always verify timing margins using the AC characteristics table in the official AT25SF081B-SSHD-T datasheet.

Does the AT25SF081B-SSHD-T support execute-in-place (XiP) operation?

Yes, the AT25SF081B-SSHD-T explicitly supports execute-in-place (XiP) via its 0-4-4 continuous quad I/O read command, which eliminates opcode transmission overhead between data bursts. This feature, combined with 108 MHz clock support and low-latency access, allows microcontrollers to directly fetch and execute code from the AT25SF081B-SSHD-T without loading into RAM first - reducing system memory footprint and boot time.

How many one-time programmable (OTP) security registers does the AT25SF081B-SSHD-T include?

The AT25SF081B-SSHD-T includes three 256-byte one-time programmable (OTP) security registers, accessible via dedicated commands (42h/44h/48h). These registers are used to store immutable device identifiers, cryptographic keys, or calibration data that must survive power cycles and cannot be altered after programming - a critical feature for secure boot and anti-counterfeiting in the AT25SF081B-SSHD-T.

What package type is used for the AT25SF081B-SSHD-T?

The AT25SF081B-SSHD-T uses an 8-lead, 208-mil wide EIAJ SOIC package (also referenced as MS-012AC), with gull-wing leads and RoHS-compliant green finish. This package is compatible with standard surface-mount assembly processes and provides mechanical reliability for industrial applications - distinct from the narrower 150-mil SOIC variant and the UDFN option.

Can the AT25SF081B-SSHD-T operate across the full industrial temperature range?

Yes, the AT25SF081B-SSHD-T is fully specified for operation from −40 °C to +85 °C, meeting industrial-grade environmental requirements. All electrical parameters - including 108 MHz max clock, 1.2 µA deep power-down current, and 100,000 program/erase cycles - are guaranteed across this range, making the AT25SF081B-SSHD-T suitable for deployment in uncontrolled ambient environments such as factory floors or outdoor IoT gateways.