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Renesas AT25DN256-SSHFGP-B
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- Part No.:
- AT25DN256-SSHFGP-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25DN256-SSHFGP-B.pdf
- Description:
- IC FLASH 256KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,795
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Product details
Overview
AT25DN256-SSHFGP-B from Adesto Technologies is a 256-Kbit serial SPI flash memory IC optimized for code shadowing and mixed code/data storage in embedded systems. It operates from 2.3V–3.6V, supports SPI Modes 0/3 and Dual-Output Read up to 50 MHz, delivers 6 ns clock-to-output timing, and features uniform 4-KB/32-KB block erase plus 256-byte page erase.
For engineers reviewing the AT25DN256-SSHFGP-B datasheet, AT25DN256-SSHFGP-B pinout, AT25DN256-SSHFGP-B application, or AT25DN256-SSHFGP-B equivalent, key selection considerations include its dual-read throughput advantage, hardware write protection via WP pin, 128-byte OTP security register (64-byte factory UID + 64-byte user-programmable), ultra-deep power-down current of 350 nA, and industrial temperature range compliance.
Technical Context
The AT25DN256-SSHFGP-B implements a flexible SPI interface with dedicated SI (I/O0) and SO (I/O1) pins supporting standard single-output and dual-output read modes - enabling two bits per SCK falling edge during Dual-Output Read. Its command set includes opcodes for Page Erase (81h), 4-KB Block Erase (20h), 32-KB Block Erase (52h/D8h), and Chip Erase (60h/C7h/62h), all requiring prior Write Enable (06h) activation.
Internally, it uses an intelligent programming/erase algorithm that detects and reports failures via the EPE bit in the Status Register. The memory array is organized into 128 pages of 256 bytes each (total 32 KB × 8 = 256 Kbit), with address bits A23–A0 mapped across three-byte addressing, though only A14–A0 are active due to the 256-Kbit capacity (000000h–007FFFh).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32 KB), sufficient for firmware boot images or configuration data in space-constrained IoT nodes. |
| Supply Voltage | 2.3 V – 3.6 V single supply - eliminates need for charge pumps or auxiliary rails in battery-powered or low-voltage MCU designs. |
| Max Clock Frequency | 104 MHz for standard read/program/erase; 50 MHz for Dual-Output Read - enables faster data streaming than legacy 33 MHz SPI flash parts. |
| Read Latency | 6 ns clock-to-output (tV) - reduces wait states and improves real-time responsiveness in time-critical applications. |
| Erase Granularity | 256-byte page, 4-KB block, 32-KB block, full chip - allows precise over-the-air update partitioning without wasting memory on large-sector devices. |
| OTP Security Register | 128-byte one-time programmable register: 64-byte factory UID + 64-byte user area - supports device authentication and secure key binding without external crypto ICs. |
| Power Consumption | 350 nA ultra-deep power-down current - extends battery life in always-on sensor nodes or wearables between wake cycles. |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention - meets industrial lifecycle requirements for field-deployed equipment. |
Pinout & Package
AT25DN256-SSHFGP-B is packaged in an 8-lead SOIC (150-mil) with industry-standard pinout and RoHS-compliant lead-free finish. Pin functions are fully SPI-compatible and support hardware write protection and hold functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable: initiates all commands; deassertion places SO in high-Z and enters standby mode (not deep power-down). |
| SCK | Serial clock input | Controls data timing: rising edge latches SI/I/O0; falling edge clocks out SO/I/O1 - supports SPI Modes 0 and 3. |
| SI (I/O0) | Serial input / dual-output data line | Input for commands/addresses/data; becomes output (I/O0) during Dual-Output Read to deliver LSB-aligned bit pairs with SO. |
| SO (I/O1) | Serial output / dual-output data line | Outputs MSB-aligned data during all reads; remains I/O1 in Dual-Output Read to enable 2-bit-per-cycle transfer. |
| WP | Hardware write protect input | Active-low lock: prevents accidental program/erase when tied low; internally pulled high - optional external pull-up recommended. |
| HOLD | Serial interface pause input | Active-low suspend: halts ongoing transfers without deselecting CS or resetting state - useful for interrupt-driven host controllers. |
| VCC | Power supply | 2.3–3.6 V main supply - powers internal logic, charge pumps, and I/O buffers; no separate VPP required. |
| GND | Ground reference | System ground return path - must be low-impedance and co-located with MCU ground for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Read support | Enables 2× read throughput vs. standard SPI by using both SI and SO as outputs - cuts firmware load time in half at same clock rate. |
| Flexible erase architecture | Page (256 B), 4-KB, 32-KB, and full-chip erase options allow optimal memory utilization for mixed code+data layouts - avoids wasted sectors. |
| 128-byte OTP security register | Factory-programmed 64-byte unique ID + 64-byte user area supports secure boot, device identity, and encrypted key storage without external security IC. |
| Ultra-low deep power-down | 350 nA typical current draw in ultra-deep power-down mode - ideal for energy-harvesting or coin-cell-powered edge sensors. |
| Industrial temperature range | –40°C to +85°C operation - qualified for automotive infotainment modules, industrial HMIs, and outdoor telemetry gateways. |
| JEDEC-standard ID read | Supports 9Fh Manufacturer/Device ID command - simplifies automated BOM verification and firmware auto-detection during production programming. |
Applications
| Secure Firmware Storage | IoT Sensor Node Code + Data |
|---|---|
Use Scenario: Storing signed bootloader and application firmware in a smart meter with remote OTA updates. IC Role / Device Role / Timing Role: Non-volatile code storage with hardware write protection and OTP-based public key binding. Use Value: Prevents unauthorized firmware modification using WP pin lock and factory UID-linked signature verification - eliminates need for external secure element. | Use Scenario: Logging environmental sensor readings while executing lightweight firmware on an ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Dual-purpose memory for executable code (shadowed to RAM) and runtime data logging with minimal erase overhead. Use Value: 256-byte page erase enables efficient log rotation without erasing entire firmware sections - preserves 20-year data integrity across 100k cycles. |
| Industrial HMI Configuration | Wearable Device Boot Image |
Use Scenario: Storing UI assets, language packs, and calibration tables in a panel-mounted human-machine interface. IC Role / Device Role / Timing Role: High-reliability configuration storage with fast 4-KB block erase for field-upgradable display themes. Use Value: Uniform 4-KB erase blocks align precisely with asset bundle sizes - avoids partial-block waste seen in 64-KB sector flash. | Use Scenario: Holding compressed boot image and BLE stack parameters in a compact fitness tracker powered by CR2032. IC Role / Device Role / Timing Role: Ultra-low-power nonvolatile memory with 350 nA deep power-down current and fast wake-up read access. Use Value: Extends battery life beyond 12 months by minimizing quiescent current during sleep - enabled by dedicated ultra-deep power-down mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q256JWEIQ | 512-Mbit density, quad-SPI interface, 133 MHz max clock, no dual-output read mode - requires QSPI controller support. | Better suited for high-bandwidth graphics or audio buffering; lacks integrated OTP security register. | Select when higher density and quad-I/O throughput are needed, and host supports QSPI; not drop-in compatible due to different command set and pin function mapping. |
| Macronix MX25L25635F | 256-Mbit density, standard SPI, 104 MHz max clock, 2.7–3.6 V supply - no ultra-deep power-down (min 1 µA), no OTP register. | Targeted at cost-sensitive consumer electronics; lacks UID and low-power features critical for secure or battery-operated use cases. | Consider for price-driven applications where OTP and sub-µA power are unnecessary; verify voltage compatibility - AT25DN256-SSHFGP-B supports down to 2.3 V. |
Compared with W25Q256JWEIQ and MX25L25635F, the AT25DN256-SSHFGP-B offers unique value in secure, low-power, mixed-code-data embedded systems - delivering factory UID, 350 nA deep power-down, and dual-output read in a 256-Kbit footprint unmatched by either alternative.
Availability
AT25DN256-SSHFGP-B is available at Aetrix Electronics and suitable for IoT sensor nodes, industrial HMIs, wearable boot storage, and secure firmware applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT25DN256-SSHFGP-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, nonvolatile memory and IoT connectivity solutions before integration into Renesas' embedded power and analog portfolio.
The AT25DN256 product line was designed specifically for energy-efficient, secure, and flexible code+data storage in resource-constrained embedded systems - emphasizing ultra-low power states, hardware protection, and fine-grained erase control.
FAQ
What is the maximum operating frequency of the AT25DN256-SSHFGP-B during Dual-Output Read operations?
The AT25DN256-SSHFGP-B supports Dual-Output Read at up to 50 MHz, as specified in the DS-25DN256–039G–02/2022 datasheet. This mode uses both SI (I/O0) and SO (I/O1) pins to output two bits per SCK falling edge, doubling effective read throughput versus standard SPI read at the same clock rate. Standard read operations support up to 104 MHz using opcode 0Bh.
Does the AT25DN256-SSHFGP-B include a unique identifier, and how is it implemented?
Yes, the AT25DN256-SSHFGP-B includes a 64-byte factory-programmed unique identifier stored in its 128-byte OTP security register. This UID is permanently written during manufacturing and cannot be altered. The remaining 64 bytes of the OTP register are user-programmable for keys or custom identifiers - once programmed, they cannot be erased or rewritten.
What erase block sizes does the AT25DN256-SSHFGP-B support, and why does that matter for firmware updates?
The AT25DN256-SSHFGP-B supports 256-byte page erase, 4-KB block erase, 32-KB block erase, and full chip erase. This granularity allows firmware update routines to erase only the exact region containing new code - avoiding unnecessary erasure of adjacent configuration or log data. For example, a 3.8 KB firmware patch fits cleanly into a single 4-KB block, preserving 200+ bytes of unused space instead of wasting an entire 64-KB sector.
How does hardware write protection work on the AT25DN256-SSHFGP-B, and what is the role of the WP pin?
The WP (Write Protect) pin on the AT25DN256-SSHFGP-B provides hardware-level locking of protected memory sectors. When WP is driven low, it disables program and erase operations on designated protected regions - independent of software commands. The pin is internally pulled high, so it may float if protection is unused, but Adesto recommends connecting it to VCC externally for noise immunity and predictable behavior.
What is the ultra-deep power-down current specification for the AT25DN256-SSHFGP-B, and how is it activated?
The AT25DN256-SSHFGP-B draws just 350 nA typical current in ultra-deep power-down mode, entered via the 79h opcode. This state retains full memory contents while minimizing leakage - critical for battery-powered devices that spend >99% of their time asleep. Recovery is immediate upon issuing the ABh resume command; no reinitialization or delay is required before subsequent reads.
AT25DN256-SSHFGP-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 8µs, 1.75ms
- Access Time:
- -
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25DN256-SSHFGP-B FAQ
1.How can I place an order for AT25DN256-SSHFGP-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DN256-SSHFGP-B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT25DN256-SSHFGP-B reliable?
The price and inventory of AT25DN256-SSHFGP-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DN256-SSHFGP-B is usually 5 days.
3.What payment methods are accepted for AT25DN256-SSHFGP-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DN256-SSHFGP-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DN256-SSHFGP-B?
AT25DN256-SSHFGP-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DN256-SSHFGP-B order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT25DN256-SSHFGP-B?
For technical support, including AT25DN256-SSHFGP-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DN256-SSHFGP-B requirements.
6.How does Aetrix verify that AT25DN256-SSHFGP-B is sourced from the original manufacturer or authorized distributors?
All AT25DN256-SSHFGP-B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT25DN256-SSHFGP-B meets industry standards.
7.What is the process for return or replacement of AT25DN256-SSHFGP-B?
All AT25DN256-SSHFGP-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25DN256-SSHFGP-B, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT25DN256-SSHFGP-B part is unused and in its original packaging.
Return procedure for AT25DN256-SSHFGP-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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