Renesas AT25XE041B-SSHN-B

Overview

AT25XE041B from Renesas Electronics is a 4-Mbit SPI serial flash memory IC supporting Dual-I/O operation, 85 MHz max clock frequency, 1.65–3.6 V single-supply operation across –40°C to +85°C, and flexible erase architecture (256-byte page, 4/32/64-kByte blocks, full chip). It serves as nonvolatile code and data storage in embedded microcontroller boot systems.

For engineers reviewing the AT25XE041B datasheet, AT25XE041B pinout, AT25XE041B application, or AT25XE041B equivalent, key selection criteria include Dual-I/O read throughput, ultra-low deep power-down current (200 nA), OTP security register usability, sector protection via WP pin, and industrial temperature compliance without voltage translation.

Technical Context

The AT25XE041B implements a standard SPI interface compliant with Modes 0 and 3, with dual-output read enabling 2-bit-per-clock data transfer on I/O0 and I/O1 pins. Its internal command decoder supports byte/page program, sequential programming, and five distinct erase granularities - including 256-byte pages for fine-grained data updates and uniform 64-kByte blocks for firmware image replacement.

Hardware write protection is enforced via the active-low WP pin, while software-controlled locking uses status register bits. The device integrates a 128-byte OTP security register (64 bytes factory-programmed unique ID, 64 bytes user-programmable) and supports active status interrupt reporting for asynchronous operation monitoring.

Key Specifications

Pinout & Package

AT25XE041B-SSHN-B is supplied in an 8-lead SOIC (150-mil) package per JEDEC MS-012, with gull-wing leads and 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot; pin numbering follows standard counter-clockwise convention from top-left when viewed from top.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q40EW and MT25QL04A, the AT25XE041B delivers optimized Dual-I/O throughput at lower pin count and simpler controller requirements, with superior ultra-deep power-down current (200 nA vs. ≥1 µA) for energy-constrained edge devices.

Availability

AT25XE041B is available at Aetrix Electronics and suitable for industrial automation, automotive telematics, and IoT edge node applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT25XE041B 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 trusted microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT markets.

The AT25XE041B belongs to Renesas' serial NOR flash product line, engineered for high-density, low-voltage, and low-power embedded code and data storage in resource-constrained systems.

FAQ

What is the maximum operating frequency supported by the AT25XE041B?

The AT25XE041B supports a maximum operating frequency of 85 MHz for SPI communication. This applies to both standard single-I/O read operations and Dual-I/O read modes. The 6 ns clock-to-output (tV) timing ensures minimal latency during high-speed instruction fetch or data streaming, making the AT25XE041B suitable for real-time embedded applications where deterministic timing is critical.

Does the AT25XE041B support Quad-I/O operation?

No, the AT25XE041B does not support Quad-I/O operation. It supports SPI Modes 0 and 3 with Dual-I/O capability-using SI (I/O0) and SO (I/O1) pins to transfer two bits per clock cycle during Dual-Output Read commands. Quad-I/O functionality is not implemented in the AT25XE041B architecture, and no command set or pin configuration enables four-bit parallel data transfer.

How is hardware write protection implemented on the AT25XE041B?

Hardware write protection on the AT25XE041B is implemented via the active-low WP (Write Protect) pin. When WP is driven low, it prevents writes to the status register and disables sector protection/unprotection commands. The WP pin is internally pulled high, so it may be left floating if hardware protection is unused-but Renesas recommends connecting it to VCC externally for noise immunity. This complements software-based sector locking for layered security.

What is the purpose and structure of the OTP security register in the AT25XE041B?

The AT25XE041B includes a 128-byte One-Time Programmable (OTP) security register: 64 bytes are factory-programmed with a unique device identifier, and 64 bytes are user-programmable once. It supports secure functions such as electronic serial number (ESN) storage, cryptographic key binding, and device authentication. Programming is irreversible and requires specific unlock sequences; reads are unrestricted and accessible via dedicated commands.

Can the AT25XE041B operate across the full industrial temperature range?

Yes, the AT25XE041B is specified for full industrial temperature operation from –40°C to +85°C at 1.65–3.6 V supply, and extended operation from –40°C to +125°C at 1.7–3.6 V. Its 100,000 program/erase cycles and 20-year data retention are guaranteed across the –40°C to +85°C range, meeting requirements for harsh-environment applications including factory automation and under-hood automotive systems.