Renesas AT45DB041E-SHN2B-T

Overview

AT45DB041E-SHN2B-T from Renesas Electronics is a 4-Mbit serial DataFlash memory with extra 128 kbits of OTP security register, operating from 1.65 V to 3.6 V, supporting SPI modes 0 and 3 up to 85 MHz, featuring two independent 256/264-byte SRAM buffers and RapidS™ high-speed read capability. It enables continuous streaming in voice recording, firmware storage, and embedded boot code applications.

For engineers reviewing the AT45DB041E-SHN2B-T datasheet, AT45DB041E-SHN2B-T pinout, AT45DB041E-SHN2B-T application, or AT45DB041E-SHN2B-T equivalent, key selection criteria include page size configurability (256 vs. 264 bytes), ultra-deep power-down current (400 nA), sector lockdown permanence, buffer-to-memory program with built-in erase, and industrial temperature support (–40 °C to +85 °C).

Technical Context

The AT45DB041E-SHN2B-T implements a sequential-access Flash architecture with dual SRAM buffers enabling concurrent read-while-write operation - one buffer receives new data while the other transfers to main memory. Its RapidS™ mode supports high-frequency continuous array reads using opcodes 0Bh and 1Bh, achieving ≤6 ns clock-to-output time.

Memory organization comprises 2,048 pages × 256/264 bytes, plus 128-byte OTP security register (64 bytes factory-unique ID + 64 bytes user-programmable). Sector protection and hardware/software-controlled lockdown are implemented via dedicated registers accessible through JEDEC-standard commands (e.g., 32h, 35h, 77h).

Key Specifications

Pinout & Package

AT45DB041E-SHN2B-T is packaged in an 8-pad Ultra-thin DFN (5 × 6 × 0.6 mm) with exposed thermal pad (non-connected). Pin functions align with standard SPI interface plus hardware write-protect and reset control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q40EWSSIG and MX25L4006EM2I-12G, the AT45DB041E-SHN2B-T uniquely delivers simultaneous buffer access, hardware-enforced sector lockdown, and integrated OTP identity - making it the only option among the three qualified for safety-critical firmware storage with traceable device identity.

Availability

AT45DB041E-SHN2B-T is available at Aetrix Electronics and suitable for industrial firmware storage, medical data logging, automotive infotainment boot memory, and smart meter calibration storage requiring stable component supply and long-term lifecycle assurance.

Supply support for AT45DB041E-SHN2B-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 markets.

The AT45DB041E belongs to Renesas' DataFlash® family - designed specifically for high-reliability, low-pin-count, sequential-access Flash applications where concurrent buffer operation and hardware security are mandatory.

FAQ

What is the maximum supported SPI clock frequency for AT45DB041E-SHN2B-T?

The AT45DB041E-SHN2B-T supports up to 85 MHz in RapidS™ mode (opcodes 0Bh/1Bh) and up to 15 MHz in low-power read mode (opcode 01h). This allows system designers to dynamically select speed versus power consumption based on real-time requirements. The 85 MHz rating is validated across the full industrial temperature range (–40 °C to +85 °C) and applies directly to the AT45DB041E-SHN2B-T package variant.

Does AT45DB041E-SHN2B-T support true read-while-write operation?

Yes, the AT45DB041E-SHN2B-T implements true concurrent operation using its two independent SRAM buffers: while one buffer writes incoming data, the other can transfer content to main memory or serve as scratchpad. This eliminates write stalls during continuous data capture - a capability confirmed in the AT45DB041E-SHN2B-T datasheet Section 5 and Figure 2 block diagram.

How is the page size configured on AT45DB041E-SHN2B-T?

The AT45DB041E-SHN2B-T page size is factory-configured to 264 bytes by default but can be user-set to 256 bytes via the Buffer and Page Size Configuration command (Table 22). This setting persists across power cycles and determines addressing alignment and buffer usage - critical for EEPROM emulation workflows. The configuration is verified in AT45DB041E-SHN2B-T datasheet Section 12 and Table 32/33.

What security features does AT45DB041E-SHN2B-T provide beyond standard write protection?

AT45DB041E-SHN2B-T provides hardware-enforced sector lockdown (making sectors permanently read-only), a 128-byte OTP security register (64 bytes factory-unique ID + 64 bytes user-programmable), and individual sector protection registers. These features are accessed via dedicated opcodes (35h, 77h, 32h) and operate independently of software state - ensuring tamper resistance even if firmware is compromised. All are documented for AT45DB041E-SHN2B-T in Sections 8–9 of the datasheet.

Is AT45DB041E-SHN2B-T compatible with standard SPI controllers?

Yes, AT45DB041E-SHN2B-T is fully compatible with standard SPI controllers supporting modes 0 and 3. It uses standard SI/SO/SCK/CS signaling with no proprietary protocol layer. Command opcodes (e.g., 03h for legacy read, D2h for page read) follow JEDEC conventions, and timing parameters (tV ≤ 6 ns, tSU ≥ 4 ns) meet common MCU SPI peripheral specifications. This compatibility is explicitly confirmed for AT45DB041E-SHN2B-T in Section 1 and Table 27.