Renesas AT45DB161E-SSHD-B

Overview

AT45DB161E-SSHD-B from Renesas Electronics is a 16-Mbit serial DataFlash memory with 512-kbit extra capacity, supporting SPI modes 0 and 3, up to 85 MHz operation, 6 ns clock-to-output time, and dual 512/528-byte SRAM buffers. It enables concurrent data reception and main memory reprogramming in embedded firmware storage, voice logging, and industrial data logger applications.

For engineers reviewing the AT45DB161E-SSHD-B datasheet, AT45DB161E-SSHD-B pinout, AT45DB161E-SSHD-B application, or AT45DB161E-SSHD-B equivalent, key selection criteria include page size configurability (512 vs. 528 bytes), RapidS™ high-speed read capability, ultra-deep power-down current (400 nA), sector lockdown security, and JEDEC-standard ID read support.

Technical Context

The AT45DB161E-SSHD-B implements a sequential-access Flash architecture with two independent SRAM buffers, enabling true interleaved write operations: while one buffer receives incoming data, the other transfers content to main memory. Its RapidS™ mode supports high-frequency continuous array reads using opcodes 0Bh and 1Bh, achieving up to 85 MHz clock rates with tV ≤ 6 ns.

Memory organization comprises 4,096 pages of either 512 or 528 bytes (factory-configurable), plus 128-byte OTP security register with 64-byte factory-unique ID and 64-byte user-programmable space. Erase granularity spans page (512/528 B), block (4 kB), sector (128 kB), and full chip (16 Mbits), all with suspend/resume capability.

Key Specifications

Pinout & Package

AT45DB161E-SSHD-B uses an 8-lead SOIC package (0.208" wide, JEDEC MS-012AC), with pin 1 marked by notch or dot. All pins are CMOS-compatible and operate over full industrial temperature range (−40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q16JW and SST26VF016B, the AT45DB161E-SSHD-B uniquely delivers concurrent buffer operation, configurable page size, ultra-low deep-sleep current, and hardware-enforced sector lockdown - making it optimal for streaming, secure, and battery-constrained applications.

Availability

AT45DB161E-SSHD-B is available at Aetrix Electronics and suitable for firmware storage, voice/data logging, and industrial HMI applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT45DB161E-SSHD-B 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 AT45DB161E belongs to Renesas' DataFlash family - designed specifically for high-reliability, low-pin-count, sequential-access Flash applications where concurrent buffering, flexible erase granularity, and hardware security are essential.

FAQ

What is the page size configuration for AT45DB161E-SSHD-B?

The AT45DB161E-SSHD-B supports factory-configured page sizes of either 512 bytes or 528 bytes. The default is 528 bytes, which includes 16 bytes of overhead for metadata or ECC. This configuration is fixed at manufacture and cannot be changed in-system. The 528-byte layout aligns with standard DataFlash addressing and simplifies firmware partitioning in resource-constrained microcontrollers.

Does AT45DB161E-SSHD-B support true concurrent read-while-write operation?

Yes, the AT45DB161E-SSHD-B supports true concurrent operation via its two independent SRAM buffers. While one buffer accepts incoming data via SPI, the other can simultaneously transfer its contents to main memory - enabling uninterrupted streaming writes. This is distinct from simple read-while-write; it eliminates write latency in continuous data acquisition systems.

What power-saving modes does AT45DB161E-SSHD-B offer?

The AT45DB161E-SSHD-B provides three low-power states: standby (25 µA typ.), deep power-down (5 µA typ.), and ultra-deep power-down (400 nA typ.). Ultra-deep mode retains memory contents indefinitely and resumes in <100 µs. These modes are controlled via dedicated commands and are ideal for battery-powered sensors and remote monitoring nodes requiring multi-year operation.

How is hardware write protection implemented on AT45DB161E-SSHD-B?

Hardware write protection on the AT45DB161E-SSHD-B is enforced via the WP pin (active-low) and sector lockdown. When WP is asserted, all program/erase and sector protection commands are blocked. Sector lockdown - programmed once into OTP - permanently disables writes to selected sectors, providing irreversible protection for boot code or calibration data.

Is AT45DB161E-SSHD-B compatible with standard SPI controllers?

Yes, the AT45DB161E-SSHD-B is fully compatible with standard 3-wire SPI controllers supporting modes 0 and 3. It requires only CS, SCK, SI, and SO lines - no address or data bus. Command opcodes (e.g., 03h for legacy read, 0Bh for RapidS™) follow JEDEC-standard framing, ensuring drop-in compatibility with existing SPI firmware stacks without modification.