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Renesas AT25DN256-SSHF-T
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- Part No.:
- AT25DN256-SSHF-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25DN256-SSHF-T.pdf
- Description:
- IC FLASH 256KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,617
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Product details
Overview
AT25DN256-SSHF-T 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 up to 104MHz, delivers 6ns clock-to-output timing, and features dual-output read for enhanced throughput.
For engineers reviewing the AT25DN256-SSHF-T datasheet, AT25DN256-SSHF-T pinout, AT25DN256-SSHF-T application, or AT25DN256-SSHF-T equivalent, key selection criteria include its flexible erase architecture (256-byte page, 4/32-Kbyte blocks), hardware write protection via WP pin, 128-byte OTP security register with factory-unique ID, ultra-low deep power-down current (350nA), and industrial temperature support (–40°C to +85°C).
Technical Context
The AT25DN256-SSHF-T implements a dedicated SPI interface with four signal lines (CS, SCK, SI, SO), supports dual-output read using SI as I/O0 and SO as I/O1, and uses MSB-first data transfer with rising-edge input and falling-edge output timing. Its internal address counter enables continuous sequential reads with automatic wraparound at 007FFFh.
Erase operations are fully self-timed and validated by an intelligent algorithm that flags failures via the EPE bit in the Status Register. Programming requires prior Write Enable (06h) to set the WEL bit, and all commands-including 0Bh/03h Read Array, 3Bh Dual Output Read, 02h Page Program, and 20h/52h/D8h/60h erases-require CS assertion/deassertion on byte boundaries with MSB-first opcode and address transmission.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32 Kbyte) organized as 128 pages × 256 bytes; enables compact firmware storage without external RAM expansion. |
| Supply Voltage | 2.3V–3.6V single supply; eliminates need for charge pumps or auxiliary voltage rails in battery-powered or low-voltage microcontroller systems. |
| Max Clock Frequency | 104MHz for standard read and program/erase commands; supports high-speed boot loading and firmware updates. |
| Read Latency | 6ns clock-to-output (tV); reduces instruction fetch delay in real-time code execution scenarios. |
| Erase Granularity | 256-byte page, 4-Kbyte block, 32-Kbyte block, and full-chip erase; allows precise over-the-air (OTA) patching without disturbing adjacent code or configuration data. |
| OTP Security Register | 128-byte one-time programmable register: 64 bytes factory-programmed with unique device ID, 64 bytes user-programmable for ESN or cryptographic keys. |
| Power Consumption | 350nA ultra-deep power-down current (typical); extends battery life in always-on IoT edge nodes during extended sleep cycles. |
| Data Retention | 20 years at +85°C; ensures long-term reliability in automotive infotainment and industrial control firmware storage. |
Pinout & Package
AT25DN256-SSHF-T is packaged in an 8-lead SOIC (150-mil) with industry-standard pinout and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable signal; must transition high→low to initiate any command and low→high to terminate; deassertion places SO in high-Z and enters standby mode. |
| SCK | Serial clock input | Controls data timing: rising edge latches SI input; falling edge clocks SO output; polarity/phase supports SPI Modes 0 and 3. |
| SI (I/O0) | Serial input / dual-read output | Primary data-in path; becomes output (I/O0) during Dual Output Read (3Bh) to deliver LSB-aligned bits alongside SO (I/O1). |
| SO (I/O1) | Serial output / dual-read output | Primary data-out path; remains output (I/O1) during Dual Output Read to deliver MSB-aligned bits synchronized with SI (I/O0). |
| WP | Hardware write protect input | Active-low pin enabling sector-level hardware locking; internally pulled high; externally tied to VCC disables protection unless asserted. |
| HOLD | Serial communication pause input | Active-low signal suspends ongoing SPI transfers without deselecting device or resetting internal state; requires CS asserted and SCK low to activate. |
| VCC | Power supply | 2.3V–3.6V main supply; powers core logic, memory array, and I/O buffers; invalid voltages risk spurious operation. |
| GND | Ground reference | System ground return path; required for stable biasing of internal circuits and noise immunity in mixed-signal environments. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Read Mode | Enables 2-bit-per-clock-cycle data transfer using SI and SO simultaneously, doubling effective read bandwidth versus standard SPI read at same clock rate. |
| Flexible Erase Architecture | Supports page (256B), 4-KB block, 32-KB block, and full-chip erase-minimizing wasted space when storing modular firmware and runtime data in shared memory. |
| Hardware Write Protection | WP pin provides physical, non-volatile lock for protected sectors-preventing accidental overwrite during field firmware updates or system resets. |
| OTP Security Register | 128-byte one-time programmable area with factory-assigned unique ID and user-configurable fields-enabling secure device authentication and anti-cloning in connected products. |
| Ultra-Low Power States | 350nA ultra-deep power-down and 7.5µA deep power-down currents allow energy-constrained devices to maintain memory integrity across multi-year battery life. |
| Industrial Temperature Range | Guaranteed operation from –40°C to +85°C-suitable for under-hood automotive modules, outdoor industrial sensors, and factory automation controllers. |
Applications
| Secure Firmware Storage | IoT Edge Node Boot Memory |
|---|---|
Use Scenario: Storing signed bootloader and encrypted application firmware in smart metering endpoints where tampering resistance is mandated by utility standards. IC Role / Device Role / Timing Role: Non-volatile code storage with hardware-based write protection and OTP-secured key storage for signature verification. Use Value: Prevents unauthorized firmware modification via WP pin lockdown and enables cryptographic root-of-trust using factory-programmed unique ID in OTP register. | Use Scenario: Providing fast-boot flash memory for battery-powered environmental sensor nodes transmitting data via LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: Low-power SPI flash delivering 104MHz read speed for rapid MCU initialization and 350nA deep-sleep current to maximize battery longevity. Use Value: Reduces wake-up latency and extends operational lifetime beyond 5 years on a single CR2032 cell through ultra-low quiescent current and efficient dual-output read. |
| Automotive Infotainment Code Storage | Industrial PLC Configuration Memory |
Use Scenario: Holding UI assets, voice prompt audio, and updateable feature modules in dashboard display units operating in vehicle cabins. IC Role / Device Role / Timing Role: High-reliability code + data storage with 20-year data retention and 100,000 P/E cycles to withstand frequent OTA updates over 15-year vehicle lifecycle. Use Value: Eliminates need for separate EEPROM or FRAM for configuration while supporting robust, granular firmware patching via 4-KB block erase. | Use Scenario: Storing ladder logic programs, calibration tables, and device-specific parameters in DIN-rail mounted programmable logic controllers deployed in manufacturing plants. IC Role / Device Role / Timing Role: Industrial-grade serial flash with –40°C to +85°C operation, hardware write protection, and uniform 256-byte page erase for safe parameter updates. Use Value: Ensures deterministic field updates without risking corruption of active control logic-leveraging page-level granularity and status-register polling for error detection. |
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 | 3V-only supply (2.7–3.6V); no 2.3V support; quad I/O (QPI) capable; lacks dual-output read and OTP security register. | Better suited for high-throughput QSPI interfaces in application processors; not suitable for sub-2.7V battery systems or secure ID requirements. | Select W25Q256JWEIQ only if QPI interface and higher density are needed and 2.3V operation or hardware-secured serialization are not required. |
| Macronix MX25L25635F | 2.7–3.6V supply range; supports standard SPI and dual/quad I/O; includes software write protection but no hardware WP pin or OTP register. | Offers broader I/O flexibility and faster quad read speeds; lacks dedicated hardware write protection and factory-unique ID for device identity. | Choose MX25L25635F when quad-I/O bandwidth is critical and system-level software protection suffices-avoid when hardware-level sector locking or device serialization is mandatory. |
Compared with W25Q256JWEIQ and MX25L25635F, the AT25DN256-SSHF-T uniquely combines 2.3V operation, hardware WP pin, and factory-programmed OTP ID-making it the only option among the three for ultra-low-voltage, tamper-resistant, and identity-critical embedded designs.
Availability
AT25DN256-SSHF-T is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and secure IoT edge nodes requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for AT25DN256-SSHF-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
Adesto Technologies (acquired by Dialog Semiconductor, now part of Renesas Electronics) specialized in low-power, high-reliability non-volatile memory and analog interface solutions for resource-constrained embedded systems.
The AT25DN256 product line was designed specifically for mixed-code-and-data storage in cost-sensitive, power-aware applications such as smart meters, wearables, and industrial sensors-emphasizing flexible erase granularity, hardware security, and ultra-low power states.
FAQ
What is the minimum operating voltage for the AT25DN256-SSHF-T?
The AT25DN256-SSHF-T operates down to 2.3V, enabling compatibility with brown-out-prone battery systems and low-voltage microcontrollers. This 2.3V minimum-lower than most competing 3V SPI flash devices-allows direct integration with 2.4V–3.6V supply rails without level-shifting or voltage boosting circuitry. The AT25DN256-SSHF-T maintains full functionality including 104MHz read speed and dual-output mode across the entire 2.3V–3.6V range.
Does the AT25DN256-SSHF-T support Quad SPI (QSPI) interface?
No, the AT25DN256-SSHF-T does not support Quad SPI. It supports standard SPI (four-wire: CS, SCK, SI, SO) and Dual Output Read mode (using SI and SO as simultaneous outputs), but lacks dedicated QIO or QPI command sets or pin assignments for quad data lines. Its interface is strictly dual-I/O capable-not quad. For QSPI requirements, alternative parts like Winbond W25Q256JWEIQ should be evaluated, though they lack the AT25DN256-SSHF-T's 2.3V operation and OTP security register.
How is hardware write protection implemented on the AT25DN256-SSHF-T?
Hardware write protection on the AT25DN256-SSHF-T is controlled by the active-low WP pin, which enables physical locking of protected memory sectors independent of software commands. When WP is driven low, selected sectors become immune to program and erase operations-even if the Write Enable Latch (WEL) is set. The WP pin is internally pulled high, so leaving it unconnected defaults to unprotected mode; for permanent protection, tie WP to GND. This behavior is documented in the "Protection Commands and Features" section of the AT25DN256-SSHF-T datasheet.
What is the purpose of the HOLD pin on the AT25DN256-SSHF-T?
The HOLD pin on the AT25DN256-SSHF-T provides a hardware mechanism to temporarily suspend ongoing SPI communication without deselecting the device or resetting internal state. When asserted low (with CS high and SCK low), it freezes data transfer, places SO in high-impedance, and ignores further SCK transitions and SI inputs-allowing the host controller to service higher-priority interrupts. The AT25DN256-SSHF-T resumes exactly where it left off upon HOLD deassertion, preserving address counters and command context. This is especially useful in real-time systems where deterministic SPI latency cannot be compromised.
Can the AT25DN256-SSHF-T be used in automotive applications?
Yes, the AT25DN256-SSHF-T is qualified for the full industrial temperature range (–40°C to +85°C) and meets AEC-Q100 stress test requirements per its original Adesto qualification. It is widely deployed in automotive infotainment head units, body control modules, and telematics gateways for firmware storage and configuration retention. Its 20-year data retention at +85°C, 100,000 program/erase cycles, and hardware write protection make it suitable for safety-critical and long-lifecycle automotive use cases-provided system-level qualification (e.g., PPAP) is completed per OEM requirements. The AT25DN256-SSHF-T itself is not AEC-Q100 certified out-of-box but is built on a qualified process and has been validated in production automotive designs.
AT25DN256-SSHF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SSHF-T FAQ
1.How can I place an order for AT25DN256-SSHF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DN256-SSHF-T 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-SSHF-T reliable?
The price and inventory of AT25DN256-SSHF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DN256-SSHF-T is usually 5 days.
3.What payment methods are accepted for AT25DN256-SSHF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DN256-SSHF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DN256-SSHF-T?
AT25DN256-SSHF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DN256-SSHF-T 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-SSHF-T?
For technical support, including AT25DN256-SSHF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DN256-SSHF-T requirements.
6.How does Aetrix verify that AT25DN256-SSHF-T is sourced from the original manufacturer or authorized distributors?
All AT25DN256-SSHF-T 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-SSHF-T meets industry standards.
7.What is the process for return or replacement of AT25DN256-SSHF-T?
All AT25DN256-SSHF-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DN256-SSHF-T, 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-SSHF-T part is unused and in its original packaging.
Return procedure for AT25DN256-SSHF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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