Renesas AT45DB161E-SHD2B-T

Overview

AT45DB161E-SHD2B-T from Renesas Electronics is a 16-Mbit serial DataFlash memory with 512/528-byte page architecture, SPI-compatible interface (modes 0 and 3), RapidS™ high-speed operation up to 85 MHz, and dual 512/528-byte SRAM buffers enabling concurrent read/write operations. It operates from a single 2.3–3.6 V supply and targets embedded firmware storage, voice/image buffering, and E²PROM emulation in space-constrained industrial controllers.

For engineers reviewing the AT45DB161E-SHD2B-T datasheet, AT45DB161E-SHD2B-T pinout, AT45DB161E-SHD2B-T application, or AT45DB161E-SHD2B-T equivalent, key selection criteria include its 85 MHz RapidS read capability, ultra-low 400 nA deep power-down current, dual-buffer interleaving for continuous streaming, factory-configurable 512-byte page size, and hardware/software sector protection for secure firmware updates.

Technical Context

The AT45DB161E-SHD2B-T implements a sequential-access Flash architecture with two independent SRAM buffers that support simultaneous data reception into one buffer while reprogramming a main memory page from the other - enabling true pipelined write throughput. Its RapidS™ mode uses optimized command sequences (e.g., 0Bh/1Bh opcodes) to achieve 85 MHz clock rates with 6 ns clock-to-output timing.

It supports flexible erase granularity (page/4 kB block/128 kB sector/16 Mbit chip), program/erase suspend/resume, and configurable protection via dedicated sector lockdown and 128-byte OTP security register. All operations are self-timed with no external high-voltage programming required.

Key Specifications

Pinout & Package

AT45DB161E-SHD2B-T is packaged in an 8-lead SOIC (0.208" wide), per JEDEC MS-012AA, with exposed pad not internally connected. Pin functions are standardized across all AT45DB161E variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT45DB161D-SHD2B-T, the AT45DB161E-SHD2B-T delivers 29% faster read throughput and 2,500× lower deep-sleep current; versus W25Q16JVSNIQ, it provides hardware-accelerated E²PROM emulation and true pipelined writes without external buffering logic.

Availability

AT45DB161E-SHD2B-T is available at Aetrix Electronics and suitable for industrial control firmware storage, portable medical device voice buffering, and secure automotive boot storage requiring stable component supply across multi-year production cycles.

Supply support for AT45DB161E-SHD2B-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 microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.

The AT45DB161E-SHD2B-T belongs to Renesas' DataFlash family - engineered specifically for systems needing high-density, low-pin-count, low-power serial memory with integrated SRAM buffers and rapid sequential access for firmware, voice, and image storage.

FAQ

What is the maximum operating frequency of the AT45DB161E-SHD2B-T in RapidS™ mode?

The AT45DB161E-SHD2B-T supports up to 85 MHz in RapidS™ high-frequency mode using opcodes 0Bh or 1Bh. This is confirmed in the datasheet's AC characteristics table (Section 19.4) and waveform diagrams (Figures 29–30). The 6 ns maximum clock-to-output timing (tV) enables reliable high-speed data capture at this rate. Standard SPI mode supports up to 66 MHz.

Does the AT45DB161E-SHD2B-T support true byte-level writes like EEPROM?

The AT45DB161E-SHD2B-T does not support direct byte-level writes to Flash, but implements a self-contained read-modify-write operation using its dual SRAM buffers - enabling E²PROM emulation without external logic. This three-step process (main memory page → buffer → modify → program back) is documented in Section 7.6 and Figure 31 of the datasheet.

What package type is used for the AT45DB161E-SHD2B-T?

The AT45DB161E-SHD2B-T uses an 8-lead SOIC package with 0.208" body width (JEDEC MS-012AA), as specified in the Ordering Information section (Page 68) and Packaging Information (Page 71). This is distinct from the 8-pad UDFN or 11-ball WLCSP variants offered in the same family.

How does the AT45DB161E-SHD2B-T handle power-loss during programming?

The AT45DB161E-SHD2B-T features automatic erase/write suspend on power loss detection via its internal voltage monitor. Section 17.1 specifies power-up timing restrictions, and Section 5 confirms all operations are self-timed with internal charge pumps - ensuring partial writes do not corrupt adjacent pages. Status register bit 7 indicates write-in-progress for system-level recovery handling.

Can the AT45DB161E-SHD2B-T be used as a drop-in replacement for the AT45DB161D-SHD2B-T?

The AT45DB161E-SHD2B-T is pin-compatible and functionally backward-compatible with the AT45DB161D-SHD2B-T, sharing identical pinout, voltage range, and command set. However, RapidS™ mode and ultra-deep power-down are new features requiring updated firmware initialization - so while PCB layout remains unchanged, driver code must be revised to leverage enhanced capabilities.