Microchip Technology AT45DB161E-MHD2B-T

Overview

AT45DB161E-MHD2B-T from Microchip Technology (formerly Atmel) is a 16-Mbit serial DataFlash memory with dual 512/528-byte SRAM buffers, SPI interface supporting modes 0 and 3, 85 MHz max clock, and 6 ns clock-to-output time. It operates from a single 2.3V–3.6V supply and is used for firmware storage, voice logging, and embedded data buffering in industrial controllers.

For engineers reviewing the AT45DB161E-MHD2B-T datasheet, AT45DB161E-MHD2B-T pinout, AT45DB161E-MHD2B-T application, or AT45DB161E-MHD2B-T equivalent, key selection criteria include page size configurability (512 vs. 528 bytes), RapidS high-speed read support, buffer-to-memory program with built-in erase, sector lockdown capability, and ultra-low 500 nA deep power-down current.

Technical Context

The AT45DB161E-MHD2B-T implements a sequential-access Flash architecture with two independent SRAM buffers enabling concurrent receive-and-program operation. Its memory array is organized as 4,096 pages of 512 or 528 bytes, supporting page/block/sector/chip erase granularity.

It uses a 3-wire SPI interface (CS, SCK, SI/SO) with hardware write protection (WP), reset control (RESET), and status register polling. All program and erase cycles are self-timed, and it supports four distinct continuous read opcodes (01h, 03h, 0Bh, 1Bh) optimized for low-power, standard, high-speed, and ultra-high-speed operation.

Key Specifications

Pinout & Package

AT45DB161E-MHD2B-T is packaged in an 8-lead SOIC (0.150" wide), with pins arranged in standard dual-inline configuration. Pin functions are electrically defined and validated per Atmel 8782A–DFLASH–3/12 preliminary datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q16JV-IQ and MX25L1606E-M2I, the AT45DB161E-MHD2B-T uniquely delivers dual-SRAM-buffer concurrency, factory-configurable page size, hardware sector lockdown, and 500 nA ultra-deep power-down - making it optimal for streaming data acquisition and secure embedded firmware storage.

Availability

AT45DB161E-MHD2B-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, remote sensor data logging, and embedded E²PROM emulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT45DB161E-MHD2B-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

Microchip Technology acquired Atmel in 2016 and maintains the DataFlash product line as part of its broad serial memory portfolio, emphasizing reliability, industrial temperature support, and legacy design continuity.

The AT45DB161E-MHD2B-T belongs to the DataFlash family designed specifically for sequential-access, buffer-enhanced Flash applications - targeting systems needing high write concurrency, low-power operation, and robust data integrity in constrained-footprint designs.

FAQ

What is the page size configuration of the AT45DB161E-MHD2B-T?

The AT45DB161E-MHD2B-T supports user-configurable page sizes of either 512 bytes or 528 bytes. The default is 528 bytes to accommodate ECC or metadata bytes; factory pre-configuration for 512 bytes is also available. This setting affects addressing schemes and buffer usage but does not require hardware changes - it is determined during initial setup or factory programming. The AT45DB161E-MHD2B-T datasheet defines distinct address bit mappings (PA11–PA0/BA9–BA0 vs. A20–A0) for each mode.

Does the AT45DB161E-MHD2B-T support true SPI Mode 0 and Mode 3?

Yes, the AT45DB161E-MHD2B-T explicitly supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 0), as confirmed in the 8782A–DFLASH–3/12 datasheet Features section. Data is latched on the rising edge of SCK and output on the falling edge, with CS active-low assertion required to initiate commands. This dual-mode compatibility ensures interoperability with diverse microcontroller SPI peripherals without protocol translation.

How does the dual-buffer architecture of the AT45DB161E-MHD2B-T improve system performance?

The AT45DB161E-MHD2B-T integrates two independent 512/528-byte SRAM buffers that operate concurrently with main memory programming. While one buffer receives incoming data via SPI, the other can be written to Flash - eliminating write stalls and enabling continuous data streams. This architecture directly enables real-time logging, audio buffering, and E²PROM emulation without host intervention. The AT45DB161E-MHD2B-T leverages this to achieve seamless page-boundary crossing and zero-gap streaming.

What is the purpose of the 128-byte OTP Security Register in the AT45DB161E-MHD2B-T?

The AT45DB161E-MHD2B-T includes a 128-byte One-Time Programmable Security Register: 64 bytes are factory-programmed with a unique device identifier, and 64 bytes are user-programmable for keys, certificates, or calibration data. Once written, OTP contents cannot be altered - providing tamper-resistant identity binding and secure boot foundations. This feature is absent in standard SPI NOR Flash and makes the AT45DB161E-MHD2B-T suitable for applications requiring hardware-rooted trust.

Can the AT45DB161E-MHD2B-T be used in ultra-low-power applications?

Yes, the AT45DB161E-MHD2B-T is engineered for ultra-low-power operation: it draws only 500 nA in ultra-deep power-down mode (typical), 3 μA in deep power-down, and 25 μA in standby. Its low-power read mode (up to 10 MHz) and opcode 01h continuous read further reduce active power. These characteristics make the AT45DB161E-MHD2B-T ideal for energy-harvesting sensors, battery-backed data loggers, and always-on edge devices where multi-year operation is required.