Renesas AT25DN512C-SSHF-B

Overview

AT25DN512C-SSHF-B from Adesto Technologies is a 512-Kbit serial Flash memory IC with SPI interface, dual-output read support, 104MHz max clock frequency, 6ns clock-to-output delay, and flexible erase architecture (256-byte page / 4-Kbyte / 32-Kbyte / full-chip). It serves as nonvolatile code and data storage in resource-constrained embedded systems requiring fast, low-power, and secure firmware updates.

For engineers reviewing the AT25DN512C-SSHF-B datasheet, AT25DN512C-SSHF-B pinout, AT25DN512C-SSHF-B application, or AT25DN512C-SSHF-B equivalent, key selection considerations include its dual-output read throughput, hardware write protection via WP pin, 128-byte OTP security register (64B factory-unique ID + 64B user-programmable), ultra-deep power-down current (350nA typical), and industrial temperature range compliance (-40°C to +85°C).

Technical Context

The AT25DN512C-SSHF-B implements a standard SPI master-slave interface supporting Modes 0 and 3, with SI and SO pins operating as bidirectional I/O0/I/O1 during Dual-Output Read (3Bh opcode) to deliver two bits per SCK falling edge. Its memory array is organized into 256 pages of 256 bytes each, enabling fine-grained erasure for mixed code-and-data layouts.

Internal logic includes a status register with RDY/BUSY, WEL, and EPE flags; hardware-controlled sector locking via the active-low WP pin; and automatic program/erase failure detection. The device requires no external VPP voltage and operates across a single 2.3V–3.6V supply, making it suitable for battery-powered and wide-input-voltage applications.

Key Specifications

Pinout & Package

AT25DN512C-SSHF-B is packaged in an 8-lead SOIC (150-mil) with gull-wing leads, RoHS-compliant and halide-free. Pin functions are electrically defined and validated per DS-25DN512C–037H–02/2022.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q40EW and MT25QL064ABA, AT25DN512C-SSHF-B offers uniquely optimized trade-offs: smallest form factor among alternatives, lowest deep-sleep current, integrated OTP security, and dual-output read - making it ideal for space- and power-constrained edge nodes where firmware integrity and battery longevity are paramount.

Availability

AT25DN512C-SSHF-B is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, automotive body electronics, and smart home edge nodes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT25DN512C-SSHF-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

Adesto Technologies (acquired by Dialog Semiconductor, now part of Renesas Electronics) specialized in low-power, high-reliability nonvolatile memory and IoT connectivity solutions for industrial and medical markets.

The AT25DN512C product line was designed specifically for embedded systems demanding secure, energy-efficient, and flexible code-and-data storage - emphasizing ultra-low power states, hardware-based protection, and SPI interface simplicity.

FAQ

What is the maximum SPI clock frequency supported by the AT25DN512C-SSHF-B during Dual-Output Read operations?

The AT25DN512C-SSHF-B supports Dual-Output Read (opcode 3Bh) at up to 50 MHz, delivering two bits per SCK falling edge. This is lower than its 104 MHz maximum for standard Read Array (0Bh) due to timing constraints of simultaneous SI/SO output driving. The 50 MHz limit ensures setup/hold margins are maintained across industrial temperature and voltage ranges, and is explicitly specified in the DS-25DN512C–037H–02/2022 datasheet.

Does the AT25DN512C-SSHF-B require an external voltage for programming or erasing operations?

No, the AT25DN512C-SSHF-B performs all program and erase operations using only its single 2.3V–3.6V VCC supply - no external VPP or charge pump is needed. This simplifies power design and reduces BOM count. Internal circuitry generates necessary high-voltage pulses from VCC, validated across the full industrial temperature range and confirmed in the device's "Description" section and DC characteristics table.

How is the 128-byte OTP security register structured in the AT25DN512C-SSHF-B?

The AT25DN512C-SSHF-B's OTP register is divided into two 64-byte sections: the first 64 bytes are factory-programmed with a unique device identifier (e.g., serial number or cryptographic seed), and the second 64 bytes are user-programmable once via the 9Bh "Program OTP Security Register" command. Both sections are permanently locked after programming and cannot be erased or rewritten - a feature confirmed in the "Features" and "Security Commands" sections of DS-25DN512C–037H–02/2022.

What package type does the AT25DN512C-SSHF-B use, and is it RoHS-compliant?

The AT25DN512C-SSHF-B uses an 8-lead SOIC (150-mil) package with gull-wing leads, as indicated by the "SSHF-B" suffix per Adesto's naming convention. It is fully RoHS-compliant, halide-free, and lead-free, meeting JEDEC standards for green packaging - explicitly stated under "Industry Standard Green (Pb/Halide-free/RoHS Compliant) Package Options" in the datasheet's Features section.

Can the AT25DN512C-SSHF-B operate across the full industrial temperature range?

Yes, the AT25DN512C-SSHF-B is rated for operation from -40°C to +85°C ambient temperature, as confirmed in the "Features" section ("Complies with Full Industrial Temperature Range") and validated in the "DC and AC Characteristics" tables of DS-25DN512C–037H–02/2022. All key parameters - including tV = 6 ns clock-to-output, tPP = 1.25 ms page program, and 350 nA ultra deep power-down - are guaranteed across this range.