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Renesas AT25DF256-SSHN-T
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- Part No.:
- AT25DF256-SSHN-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25DF256-SSHN-T.pdf
- Description:
- IC FLASH 256KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,035
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Product details
Overview
AT25DF256-SSHN-T from Renesas Electronics is a 256-Kbit serial Flash memory IC with SPI interface, supporting dual-output read mode, 104 MHz max clock frequency, 6 ns clock-to-output delay, and flexible erase architecture (256-byte page / 4-kByte / 32-kByte / full-chip). It operates from 1.65 V to 3.6 V and is used for code shadowing and embedded data storage in resource-constrained IoT edge nodes.
For engineers reviewing the AT25DF256-SSHN-T datasheet, AT25DF256-SSHN-T pinout, AT25DF256-SSHN-T application, or AT25DF256-SSHN-T equivalent, key selection criteria include dual-read throughput, ultra-low deep power-down current (200 nA), OTP security register capability, hardware write protection via WP pin, and compatibility with SPI Modes 0 and 3 in industrial temperature range.
Technical Context
The AT25DF256-SSHN-T implements a standard SPI master-slave interface with four dedicated signal lines (CS, SCK, SI, SO), supports both single- and dual-output read commands (0Bh/3Bh), and uses rising-edge input sampling and falling-edge output timing per JEDEC-compliant SPI protocol. Its internal address counter auto-increments during sequential reads.
It integrates hardware-controlled sector locking via the WP pin, software-configurable status register bits (SRWD, BP[2:0]), and a dedicated 128-byte OTP security register-64 bytes factory-programmed with unique ID and 64 bytes user-programmable-for secure device serialization and ESN storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32 KByte) - sufficient for boot code, firmware patches, and configuration data in compact MCU systems. |
| Supply Voltage | 1.65 V to 3.6 V - enables direct interfacing with 1.8 V and 3.3 V logic without level-shifting. |
| Max Clock Frequency | 104 MHz - delivers up to 13 MB/s effective read bandwidth in dual-output mode. |
| Read Latency | 6 ns tV (clock-to-output) - minimizes wait states during high-speed instruction fetch or real-time data streaming. |
| Erase Granularity | 256-byte page / 4-kByte block / 32-kByte block / full chip - enables fine-grained firmware updates and efficient wear leveling in data logging applications. |
| Power-Down Current | 200 nA typical ultra-deep power-down - extends battery life in always-on sensor nodes and wearable devices. |
| Endurance & Retention | 100,000 program/erase cycles / 20-year data retention - meets long-life requirements for industrial control and medical firmware storage. |
Pinout & Package
AT25DF256-SSHN-T is packaged in an 8-lead SOIC (150-mil) with standard JEDEC footprint. Pin functions are electrically validated per Renesas DS-AT25DF256-035 Rev.G.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high→low to initiate command, low→high to terminate operation. |
| SCK | Serial Clock | Master-generated clock; rising edge latches SI data, falling edge clocks SO data - supports SPI Modes 0 and 3. |
| SI (I/O0) | Serial Input / Dual-Output Data 0 | Input for commands/addresses/data; becomes output (I/O0) during dual-read to deliver LSB of each byte alongside SO. |
| SO (I/O1) | Serial Output / Dual-Output Data 1 | Output for read data; remains active (I/O1) in dual-read mode to deliver MSB of each byte alongside SI. |
| WP | Write Protect | Hardware lock control; low state enables hardware-based sector protection independent of status register settings. |
| HOLD | Communication Hold | Pauses ongoing SPI transfer without deselecting device; requires CS asserted and SCK low to activate. |
| VCC | Power Supply | Single supply rail (1.65–3.6 V); powers all internal logic, memory array, and I/O buffers - no auxiliary voltage required. |
| GND | Ground Reference | Common return path for VCC and all signal pins; critical for noise immunity in mixed-signal embedded systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Read Mode | Enables 2-bit-per-clock data transfer (SI + SO as outputs), doubling read throughput vs. standard SPI read at same clock rate. |
| Flexible Erase Architecture | Supports 256-byte page erase for small firmware patches and 32-kByte block erase for major updates - reduces wasted space in mixed code/data layouts. |
| OTP Security Register | 128-byte field with 64-byte factory-unique ID and 64-byte user-programmable area - enables secure device binding and cryptographic key storage. |
| Ultra-Deep Power-Down | 200 nA typical current draw with full memory retention - ideal for battery-powered devices requiring multi-year shelf life or infrequent wake-up intervals. |
| Hardware Write Protection | WP pin provides physical, non-volatile lock override - prevents accidental writes during power transients or firmware faults. |
Applications
| Firmware Boot Storage | IoT Sensor Node Configuration |
|---|---|
Use Scenario: Storing bootloader and initial application firmware for ARM Cortex-M microcontrollers in smart metering endpoints. IC Role / Device Role / Timing Role: Non-volatile code storage with fast read access; dual-output mode accelerates boot time by reducing instruction fetch latency. Use Value: Enables sub-100 ms cold-start boot sequence while maintaining 20-year data retention and 100K-cycle endurance for field firmware updates. | Use Scenario: Holding calibrated sensor coefficients, network credentials, and device-specific thresholds in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Persistent configuration storage with hardware write protection (WP pin) to prevent corruption during brown-out events. Use Value: Guarantees parameter integrity across 10+ years of operation using ultra-deep power-down (200 nA) between 15-minute measurement cycles. |
| Industrial HMI Display Firmware | Medical Wearable Device Logs |
Use Scenario: Hosting GUI assets, font tables, and localized language strings for touch-enabled human-machine interfaces in factory automation panels. IC Role / Device Role / Timing Role: High-density data storage with 4-kByte block erase - allows incremental UI asset updates without full reflash. Use Value: Reduces downtime during field upgrades by enabling partial firmware patching; 1.65 V min supply supports operation from degraded 2-cell Li-ion packs. | Use Scenario: Recording timestamped physiological measurements (ECG, SpO₂) in disposable patient monitors with limited PCB area. IC Role / Device Role / Timing Role: Low-power, high-reliability data logger memory; OTP register stores device serial number for HIPAA-compliant traceability. Use Value: Meets IEC 62304 Class B software requirements via 100K-cycle endurance and 20-year retention - validated across -40°C to +85°C. |
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 | 3 V only (2.7–3.6 V), Quad SPI support, 133 MHz max clock, no OTP register | Better throughput in QSPI systems; lacks hardware-secured serialization capability | Select when system uses Quad SPI controller and prioritizes speed over secure ID storage |
| Macronix MX25L25635F | 1.65–3.6 V, 104 MHz, no dual-output read, 128-byte OTP (factory-only, not user-programmable) | Lower cost; missing dual-read acceleration and user-writable OTP for field provisioning | Select for cost-sensitive applications where read bandwidth and field-programmable security are non-critical |
Compared with W25Q256JWEIQ and MX25L25635F, the AT25DF256-SSHN-T uniquely balances wide voltage operation, dual-output read acceleration, and field-programmable OTP security - making it optimal for battery-powered, security-aware embedded systems requiring long-term reliability.
Availability
AT25DF256-SSHN-T is available at Aetrix Electronics and suitable for firmware boot storage, IoT sensor node configuration, and industrial HMI display firmware requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT25DF256-SSHN-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
Renesas Electronics is a global semiconductor leader delivering trusted microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT applications.
The AT25DF256-SSHN-T belongs to Renesas' serial Flash memory product line, designed specifically for code + data storage in space- and power-constrained embedded systems requiring robustness, security, and wide-voltage interoperability.
FAQ
What is the operating temperature range for the AT25DF256-SSHN-T?
The AT25DF256-SSHN-T is rated for -40 °C to +85 °C operation at supply voltages from 1.7 V to 3.6 V, and -10 °C to +85 °C at 1.65 V to 3.6 V. This dual-range specification ensures reliable performance across industrial and consumer environments. The AT25DF256-SSHN-T maintains full functionality-including dual-output read, OTP programming, and ultra-deep power-down-within these limits.
Does the AT25DF256-SSHN-T support Quad SPI interface?
No, the AT25DF256-SSHN-T does not support Quad SPI. It supports standard SPI (four-wire) and dual-output read mode (using SI and SO as simultaneous data outputs). Quad SPI requires four I/O lines (IO0–IO3) and different command opcodes, which are not implemented in the AT25DF256-SSHN-T. The AT25DF256-SSHN-T uses only SI, SO, SCK, and CS pins for communication.
How is the 128-byte OTP security register structured in the AT25DF256-SSHN-T?
The AT25DF256-SSHN-T's OTP security register is 128 bytes total: 64 bytes factory-programmed with a unique device identifier (ESN), and 64 bytes user-programmable for keys, certificates, or calibration data. Once programmed, OTP bytes cannot be erased or rewritten. The AT25DF256-SSHN-T provides dedicated 9Bh (program) and 77h (read) commands to access this register securely.
What is the minimum supply voltage required for reliable operation of the AT25DF256-SSHN-T?
The AT25DF256-SSHN-T operates reliably down to 1.65 V across the -10 °C to +85 °C temperature range, and down to 1.7 V across the extended -40 °C to +85 °C range. Below 1.65 V, functionality-including read, program, and erase-is not guaranteed. The AT25DF256-SSHN-T requires no separate programming voltage; all operations execute from the same VCC rail.
Can the AT25DF256-SSHN-T be used in SPI Mode 1 or Mode 2?
No, the AT25DF256-SSHN-T explicitly supports only SPI Modes 0 and 3, as confirmed in the official datasheet (DS-AT25DF256-035 Rev.G). These modes share identical data sampling (rising-edge input, falling-edge output) but differ in SCK idle polarity. SPI Modes 1 and 2 are not supported - attempting them may result in command misinterpretation or communication failure. The AT25DF256-SSHN-T must be configured accordingly in the host controller.
AT25DF256-SSHN-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, 2.5ms
- Access Time:
- -
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25DF256-SSHN-T FAQ
1.How can I place an order for AT25DF256-SSHN-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF256-SSHN-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 AT25DF256-SSHN-T reliable?
The price and inventory of AT25DF256-SSHN-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DF256-SSHN-T is usually 5 days.
3.What payment methods are accepted for AT25DF256-SSHN-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF256-SSHN-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF256-SSHN-T?
AT25DF256-SSHN-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF256-SSHN-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 AT25DF256-SSHN-T?
For technical support, including AT25DF256-SSHN-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF256-SSHN-T requirements.
6.How does Aetrix verify that AT25DF256-SSHN-T is sourced from the original manufacturer or authorized distributors?
All AT25DF256-SSHN-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 AT25DF256-SSHN-T meets industry standards.
7.What is the process for return or replacement of AT25DF256-SSHN-T?
All AT25DF256-SSHN-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF256-SSHN-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 AT25DF256-SSHN-T part is unused and in its original packaging.
Return procedure for AT25DF256-SSHN-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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