Renesas AT45DB041E-MHN2B-T

Overview

AT45DB041E-MHN2B-T from Renesas Electronics is a 4-Mbit serial DataFlash memory with extra 128 kbits of OTP security space, operating from 1.65 V to 3.6 V, supporting SPI modes 0 and 3, up to 85 MHz clock rate, and featuring two independent 256/264-byte SRAM buffers for concurrent read/write operations. It enables high-reliability firmware storage in space-constrained industrial controllers.

For engineers reviewing the AT45DB041E-MHN2B-T datasheet, AT45DB041E-MHN2B-T pinout, AT45DB041E-MHN2B-T application, or AT45DB041E-MHN2B-T equivalent, key selection criteria include its RapidS™ high-speed read capability, page-size configurability (256 vs. 264 bytes), ultra-deep power-down current (400 nA), dual-buffer interleaving support, and sector lockdown security features.

Technical Context

The AT45DB041E-MHN2B-T implements a serial sequential-access architecture with no parallel address bus, reducing pin count and EMI. Its memory array comprises 2,048 pages × 256/264 bytes, backed by two fully independent SRAM buffers enabling true background programming - data can be loaded into one buffer while the other writes to main memory.

It supports multiple erase granularities (page/2 kB block/64 kB sector/chip), program/erase suspend/resume, and hardware/software sector protection. The device integrates a 128-byte OTP security register (64 bytes factory-unique, 64 bytes user-programmable) and supports JEDEC-standard manufacturer/device ID reads.

Key Specifications

Pinout & Package

AT45DB041E-MHN2B-T is packaged in an 8-pad Ultra-thin DFN (5 mm × 6 mm × 0.6 mm), RoHS-compliant, with exposed thermal pad (non-connected or GND-tied per layout).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT45DB041E-MHN2B-T, W25Q40EW offers higher interface bandwidth but sacrifices concurrent buffer operation and ultra-low-power sleep, while MX25L4005 provides basic SPI Flash functionality at lower cost but omits security and advanced power management essential for certified industrial and medical designs.

Availability

AT45DB041E-MHN2B-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device secure bootloaders, remote sensor data logging, and smart meter configuration management requiring stable component supply and long-term lifecycle support.

Supply support for AT45DB041E-MHN2B-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 trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications, with strong IP in Flash memory and microcontroller ecosystems.

The AT45DB041E belongs to Renesas' DataFlash® family, designed specifically for high-reliability, low-pin-count, low-voltage serial code and data storage in resource-constrained embedded systems requiring security, endurance, and ultra-low power.

FAQ

What is the page size configuration for AT45DB041E-MHN2B-T, and how is it set?

The AT45DB041E-MHN2B-T supports two page sizes: 256 bytes (factory pre-configured option) or 264 bytes (default). Configuration is performed via the Buffer and Page Size Configuration command (0x3D) during initialization. The setting persists across power cycles and determines addressing behavior for all page-based operations including program and erase.

Does AT45DB041E-MHN2B-T support true concurrent read and write operations?

Yes - AT45DB041E-MHN2B-T uses two independent 256/264-byte SRAM buffers to enable true concurrency: while one buffer is being written to via SI, the other can simultaneously execute a buffer-to-main-memory page program. This eliminates write stalls and supports continuous data streaming in logging or firmware update scenarios.

How does the sector lockdown feature work on AT45DB041E-MHN2B-T?

AT45DB041E-MHN2B-T allows per-sector lockdown via the Sector Lockdown Register. Once a sector is locked and the lockdown is frozen (using opcode 0x3A), that sector becomes permanently read-only - no software or hardware command can re-enable writes. This protects critical firmware or calibration data from corruption across the device's lifetime.

What is the lowest power consumption state of AT45DB041E-MHN2B-T, and how is it entered?

The lowest power state is Ultra-Deep Power-Down, drawing 400 nA typical current. It is entered using the Ultra-Deep Power-Down command (0xB9) with CS held low for ≥20 ns after command completion. Recovery requires CS high for ≥100 ns followed by a RESET pulse or power cycle - no SPI activity resumes until reset completes.

Can AT45DB041E-MHN2B-T emulate EEPROM byte-alterability, and how?

Yes - AT45DB041E-MHN2B-T supports E2PROM emulation via a self-contained three-step read-modify-write operation: (1) Main Memory Page Read into Buffer, (2) Buffer Modify (byte-level changes), (3) Buffer-to-Main-Memory Page Program. This avoids full-page erase and enables bit/byte updates without external controller logic.