Renesas AT25XE041B-XMHN-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, and industrial temperature range (–40°C to +85°C). It delivers 6 ns clock-to-output timing and integrates hardware write protection via WP pin for secure code and data storage in embedded microcontrollers and IoT edge nodes.

For engineers reviewing the AT25XE041B datasheet, AT25XE041B pinout, AT25XE041B application, or AT25XE041B equivalent, key selection criteria include its flexible erase architecture (256-byte page / 4/32/64-kByte blocks), 128-byte OTP security register with factory-unique ID, ultra-low 200 nA deep power-down current, and JEDEC-standard manufacturer/device ID read capability.

Technical Context

The AT25XE041B implements a standard SPI interface compliant with Modes 0 and 3, with dual-input/dual-output capability enabling 2-bit-per-clock data transfer during read and program operations. Its internal architecture includes a dedicated status register with active interrupt flag and byte-2 configuration for enhanced control.

It supports full command-set compatibility with JEDEC JESD216 for SFDP, enables sequential programming mode with automatic status polling, and features hardware/software sector protection using both WP pin assertion and software commands-ensuring robust firmware integrity in resource-constrained systems.

Key Specifications

Pinout & Package

AT25XE041B-XMHN-B is packaged in an 8-lead SOIC (150-mil) with standard SPI pinout and hardware control pins. The package supports reflow soldering and is RoHS-compliant.

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 uniquely combines Dual-I/O bandwidth, integrated 128-byte OTP with factory ID, and ultra-low 200 nA power-down-making it optimal for secure, battery-sensitive, and mixed-voltage embedded applications where fine-grained erase control matters.

Availability

AT25XE041B is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical sensor data logging, automotive ADAS boot memory, and smart home gateway configuration requiring stable component supply and long-term lifecycle support.

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, and IoT markets.

The AT25XE041B belongs to Renesas' serial flash memory product line, engineered specifically for high-reliability, low-power, and secure code/data storage in resource-constrained embedded systems.

FAQ

What is the maximum operating frequency and corresponding clock-to-output timing for the AT25XE041B?

The AT25XE041B supports a maximum operating frequency of 85 MHz, with a guaranteed clock-to-output timing (tV) of 6 ns under standard conditions. This specification enables high-speed instruction fetch and data retrieval in real-time embedded applications, reducing CPU idle time during memory access. The timing is validated across the full industrial temperature range (–40°C to +85°C) and 1.65–3.6 V supply, ensuring consistent performance in diverse operating environments. AT25XE041B maintains this timing without requiring external timing compensation circuits.

Does the AT25XE041B support Dual-I/O operation, and how does it affect data throughput?

Yes, the AT25XE041B supports Dual-I/O operation, allowing two bits of data to be transferred per SCK falling edge during read and program commands. This doubles effective throughput compared to standard single-I/O SPI mode at the same clock frequency. The SI and SO pins function as I/O0 and I/O1 respectively in Dual-I/O mode, and the feature is enabled via specific opcodes (e.g., 3Bh for Dual-Output Read). AT25XE041B's Dual-I/O capability is fully documented in its command set and timing diagrams, and requires compatible host controller support.

What erase block sizes does the AT25XE041B support, and why is this important for embedded firmware design?

The AT25XE041B supports four erase granularities: 256-byte page, 4-kByte block, 32-kByte block, and 64-kByte block, plus full-chip erase. This flexibility allows firmware architects to isolate critical code sections (e.g., bootloader) in small protected pages while allocating larger blocks for application binaries or log buffers-minimizing wasted space and enabling atomic updates. AT25XE041B's architecture eliminates the need for external EEPROM or FRAM in mixed code/data systems, directly addressing memory efficiency challenges in cost-sensitive MCU designs.

How does the 128-byte OTP security register in the AT25XE041B enhance system security?

The AT25XE041B's 128-byte OTP security register contains 64 bytes factory-programmed with a unique device identifier and 64 bytes user-programmable for keys, certificates, or calibration data. Once written, OTP contents cannot be altered-providing immutable device identity and secure key storage without external secure elements. This capability enables hardware-rooted trust in AT25XE041B-based systems, supporting secure boot, anti-cloning, and firmware attestation. The register is accessed via dedicated commands (4Bh/4Ch) and operates independently of main array protection settings.

What power-saving modes does the AT25XE041B offer, and what are their typical current draws?

The AT25XE041B offers three low-power states: Standby (25 µA typical), Deep Power-Down (4.5 µA typical), and Ultra-Deep Power-Down (200 nA typical). Ultra-Deep mode retains memory contents while drawing negligible current-ideal for battery-powered sensors that wake infrequently. All modes are entered via standardized commands (B9h, 94h, 79h) and exited without reset, preserving internal state. AT25XE041B's ultra-low quiescent current is specified across temperature and voltage ranges, making it suitable for energy-harvesting and long-life deployments where every nanoamp counts.