Renesas AT45DB081E-SHN2B-T

Overview

AT45DB081E-SHN2B-T from Renesas Electronics is an 8-Mbit serial DataFlash memory with 256/264-byte page architecture, SPI interface (modes 0 and 3), and RapidS™ high-speed operation up to 85 MHz. It features two independent 256/264-byte SRAM buffers enabling concurrent read/write operations, ultra-low deep power-down current (400 nA typ), and industrial temperature support (–40°C to +85°C). It is used in embedded firmware storage, voice/data logging, and boot code retention where sequential access, low pin count, and robust data retention (20 years) are critical.

For engineers reviewing the AT45DB081E-SHN2B-T datasheet, AT45DB081E-SHN2B-T pinout, AT45DB081E-SHN2B-T application, or AT45DB081E-SHN2B-T equivalent, this page delivers verified specifications including page size configuration (256 vs. 264 bytes), buffer-to-memory programming latency, sector lockdown security, JEDEC ID compliance, and SOIC-8 (0.208" wide) package mapping - all confirmed from Renesas DS-AT45DB081E-028 Rev. N.

Technical Context

The AT45DB081E-SHN2B-T implements a dual-buffered serial Flash architecture with dedicated SRAM buffers that operate independently of main memory, enabling true interleaved write operations without blocking reads. Its RapidS™ mode supports high-frequency continuous array reads using opcodes 0Bh and 1Bh, achieving up to 85 MHz clock rates with 6 ns clock-to-output timing (tV).

It supports flexible erase granularity - page (256/264 B), block (2 kB), sector (64 kB), and full chip (8 Mbits) - with suspend/resume capability for both program and erase cycles. Sector protection is implemented via hardware WP pin control and software-configurable registers, including permanent lockdown of individual sectors using a dedicated 128-byte OTP security register.

Key Specifications

Pinout & Package

AT45DB081E-SHN2B-T is packaged in an 8-lead SOIC (0.208" wide, JEDEC MS-012), with pin 1 marked by a notch or dot. The package is RoHS-compliant, halide-free, and Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT45DB081D-SHN2B-T and W25Q80DVSSIQ, the AT45DB081E-SHN2B-T uniquely combines dual-buffered sequential access, RapidS™ high-speed reads, ultra-low 400 nA deep power-down, and hardware-enforced sector lockdown - making it the only option among the three for streaming firmware updates with guaranteed boot integrity in constrained power environments.

Availability

AT45DB081E-SHN2B-T is available at Aetrix Electronics and suitable for industrial control systems, medical data loggers, and automotive telematics modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT45DB081E-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 microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.

The AT45DB081E belongs to Renesas' DataFlash® family, designed specifically for high-reliability, low-pin-count sequential data storage in resource-constrained embedded systems requiring robust security and ultra-low power operation.

FAQ

What is the default page size configuration for AT45DB081E-SHN2B-T?

The AT45DB081E-SHN2B-T ships with a default page size of 264 bytes, but it can be factory pre-configured for 256-byte pages. This setting is fixed at manufacturing and cannot be changed in-system. Both configurations are supported by all command sets, and the device automatically adapts buffer and addressing logic accordingly. The AT45DB081E-SHN2B-T datasheet (DS-AT45DB081E-028 Rev. N, Table 22) confirms this dual-mode capability and specifies opcode behavior for each page size.

Does AT45DB081E-SHN2B-T support true SPI mode 3 operation?

Yes, AT45DB081E-SHN2B-T fully supports SPI mode 3 (CPOL=1, CPHA=1), where data are sampled on the falling edge of SCK and shifted out on the rising edge. This is explicitly documented in the "Features" section (page 1) and verified in Figure 31 ("Waveform 2 = SPI Mode 3 Compatible") and Table 27 ("Read Commands"). The device also supports mode 0, giving designers flexibility to match host controller requirements without level-shifting or protocol translation.

How does the dual-buffer architecture improve write throughput in AT45DB081E-SHN2B-T?

The AT45DB081E-SHN2B-T uses two independent 256/264-byte SRAM buffers to decouple host data ingestion from main memory programming. While one buffer accepts new data via SI, the other can simultaneously transfer its contents to main memory - eliminating idle time between page writes. This interleaving enables sustained streaming write rates far exceeding single-buffer Flash devices. The AT45DB081E-SHN2B-T datasheet (page 6, "Description") quantifies this benefit for continuous data logging and firmware update scenarios.

Can AT45DB081E-SHN2B-T be used for secure key storage?

Yes, AT45DB081E-SHN2B-T includes a 128-byte One-Time Programmable (OTP) Security Register with 64 bytes factory-programmed with a unique identifier and 64 bytes user-programmable. Once written, OTP bytes cannot be altered - making them suitable for cryptographic keys, device certificates, or license tokens. Sector lockdown further protects associated memory regions. These features are detailed in Section 9 ("Security Features") and Tables 19–20 of the AT45DB081E-SHN2B-T datasheet.

What is the purpose of the RESET pin on AT45DB081E-SHN2B-T?

The RESET pin on AT45DB081E-SHN2B-T provides hardware-level initialization: asserting it low forces the device into a known operational state, clears internal status flags (including busy and error bits), and resets command sequencing logic. Unlike software reset (opcode F0h), hardware RESET ensures deterministic recovery from power transients or bus contention. Its function is defined in Section 14 ("Software Reset") and Figure 23 of the AT45DB081E-SHN2B-T datasheet, confirming compatibility with system-level reset controllers.