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Renesas AT25DN256-XMHF-T
- Part No.:
- AT25DN256-XMHF-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT25DN256-XMHF-T.pdf
- Description:
- IC FLASH 256KBIT SPI 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,219
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Product details
Overview
AT25DN256-XMHF-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, delivers 104MHz max clock frequency, achieves 6ns clock-to-output delay, and features dual-output read for enhanced throughput.
For engineers reviewing the AT25DN256-XMHF-T datasheet, AT25DN256-XMHF-T pinout, AT25DN256-XMHF-T application, or AT25DN256-XMHF-T equivalent, key selection considerations include its flexible erase architecture (256-byte page / 4KB & 32KB blocks), 128-byte OTP security register with factory-unique ID, ultra-low deep power-down current (350nA typical), and industrial temperature support (−40°C to +85°C).
Technical Context
The AT25DN256-XMHF-T implements a dedicated SPI interface with hardware-controlled write protection via the WP pin and suspend/resume capability via HOLD. Its internal address counter enables continuous sequential reads, and dual-output read mode uses both SI (I/O0) and SO (I/O1) pins to output two bits per SCK falling edge-enabling up to 50MHz effective data rate.
It integrates an intelligent programming/erase algorithm that detects and flags failures via the EPE bit in the Status Register, and supports JEDEC-standard Manufacturer and Device ID read (9Fh opcode). The 128-byte OTP register is split into 64 bytes factory-programmed with a unique identifier and 64 bytes user-programmable for secure serialization or key storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32 Kbyte) organized as 128 pages × 256 bytes |
| Supply Voltage | 2.3V–3.6V - single supply; no VPP required for program/erase |
| Max Clock Frequency | 104MHz for standard read/program/erase; 50MHz for dual-output read |
| Access Time | 6ns clock-to-output (tV) - enables high-speed CPU shadowing |
| Erase Granularity | 256-byte page, 4KB block, 32KB block, and full chip - minimizes wasted space in mixed code/data layouts |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention at +85°C |
| Power Consumption | 350nA ultra-deep power-down (typical); 25µA standby (typical) |
Pinout & Package
AT25DN256-XMHF-T is packaged in an 8-lead SOIC (150-mil) - RoHS-compliant, green, Pb/halide-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must transition low-to-high to complete any operation; deselects device and places SO in high-Z |
| SCK | Serial Clock | Input clock; data latched on rising edge (SI), output shifted on falling edge (SO/SI in dual mode) |
| SI (I/O0) | Serial Input / Dual-Output Data 0 | Input for commands/addresses/data; becomes output (I/O0) during dual-output read to deliver LSB-aligned bit pairs |
| SO (I/O1) | Serial Output / Dual-Output Data 1 | Primary output for standard read; remains output (I/O1) in dual mode, delivering MSB-aligned bit pairs with SI |
| WP | Write Protect | Hardware sector lock control; active-low; internally pulled high; enables robust, glitch-immune protection without software overhead |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without deselecting CS; requires CS asserted and SCK low to activate; preserves internal state during host interrupts |
| VCC | Power Supply | 2.3V–3.6V main supply; powers all logic, memory array, and I/O buffers |
| GND | Ground Reference | System ground return path; must be low-impedance for stable timing and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Read Mode | Enables 2-bit-per-cycle data transfer using SI and SO simultaneously - doubles effective read bandwidth vs. standard SPI read |
| Flexible Erase Architecture | Supports 256-byte page, 4KB, 32KB, and full-chip erase - eliminates need for external EEPROM or FRAM in firmware update and logging applications |
| 128-Byte OTP Security Register | 64-byte factory-unique ID + 64-byte user-programmable space - provides tamper-resistant device identity and secure key storage without external crypto IC |
| Ultra-Low Power States | 350nA ultra-deep power-down and 7.5µA deep power-down - extends battery life in always-on IoT sensors and wearables |
| Hardware Write Protection | WP pin directly controls sector locking - prevents accidental firmware corruption during brown-out or reset glitches |
Applications
| Secure Firmware Storage | Industrial Sensor Data Logging |
|---|---|
Use Scenario: Storing signed bootloader and application firmware images in resource-constrained microcontrollers with limited internal flash. IC Role / Device Role / Timing Role: Non-volatile code storage with hardware write protection and OTP-based signature verification key storage. Use Value: Prevents unauthorized firmware updates via WP pin lockdown and enables cryptographic integrity checks using factory-programmed unique ID. | Use Scenario: Recording timestamped sensor readings (temperature, humidity, vibration) in remote industrial monitoring nodes operating on coin-cell batteries. IC Role / Device Role / Timing Role: Low-power, long-retention data buffer supporting frequent small writes and infrequent bulk reads over 20+ years. Use Value: 256-byte page erase minimizes write latency and energy per record; 350nA ultra-deep power-down extends multi-year battery life. |
| Consumer IoT Edge Node | Medical Diagnostic Device Configuration |
Use Scenario: Storing Wi-Fi credentials, calibration coefficients, and OTA update staging area in smart home hubs and voice assistants. IC Role / Device Role / Timing Role: Dual-interface (standard + dual-output read) configuration and parameter storage with fast read access for boot-time initialization. Use Value: 104MHz clock and 6ns tV enable sub-100µs firmware load; dual-output mode accelerates OTA patch verification. | Use Scenario: Holding device-specific calibration tables, regulatory compliance metadata, and user preference profiles in portable ultrasound or glucose meters. IC Role / Device Role / Timing Role: Secure, traceable, and field-updatable non-volatile storage compliant with IEC 62304 and FDA design controls. Use Value: 128-byte OTP register stores immutable device serial number and manufacturing lot traceability; 100K-cycle endurance supports lifetime recalibration. |
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 (2.7–3.6V); quad-SPI support; no dual-output read; 128MB density | Higher density and QSPI interface suit high-bandwidth display or audio buffering; lacks OTP security register | Select when quad-I/O bandwidth > dual-I/O and hardware security is handled externally |
| Macronix MX25L25635FMI-10G | 3V-only (2.7–3.6V); standard SPI only; 104MHz max; no OTP register; 256Mb density | Cost-optimized for mass-market consumer devices; no unique ID or user-programmable OTP segment | Select for price-sensitive, non-secure applications where 256Mb capacity is required and serialization is software-managed |
Compared with W25Q256JWEIQ and MX25L25635FMI-10G, the AT25DN256-XMHF-T uniquely combines 2.3V operation, dual-output read, integrated OTP security with factory-unique ID, and ultra-low deep power-down - making it optimal for battery-powered, secure, mixed-code-and-data embedded systems where voltage headroom and trust anchor functionality are critical.
Availability
AT25DN256-XMHF-T is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostic instruments, and secure IoT edge devices requiring stable component supply across extended product lifecycles.
Supply support for AT25DN256-XMHF-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 (now part of Dialog Semiconductor, part of Renesas Electronics) specialized in low-power, non-volatile memory and analog interface solutions for IoT and industrial applications.
The AT25DN256 product line was designed specifically for energy-efficient, secure, and flexible code-and-data storage in battery-operated and safety-critical embedded systems - emphasizing voltage flexibility, hardware protection, and long-term data integrity.
FAQ
What is the operating voltage range of the AT25DN256-XMHF-T?
The AT25DN256-XMHF-T operates from 2.3V to 3.6V - a wider low-voltage range than standard 2.7–3.6V SPI Flash devices. This allows direct interfacing with 2.5V or 2.8V system rails and improves robustness during brown-out conditions. No separate programming voltage (VPP) is required, simplifying power design. The AT25DN256-XMHF-T maintains full functionality, including 104MHz operation and 6ns tV, across this entire range.
Does the AT25DN256-XMHF-T support dual-output read, and how does it improve performance?
Yes, the AT25DN256-XMHF-T supports dual-output read using opcodes 3Bh, enabling simultaneous data output on both SO (I/O1) and SI (I/O0) pins. Each SCK falling edge clocks out two bits - effectively doubling read throughput versus standard SPI read at the same clock frequency. This mode operates up to 50MHz and is ideal for accelerating firmware loading or OTA patch validation. The AT25DN256-XMHF-T retains full backward compatibility with standard 03h/0Bh read commands.
How is hardware write protection implemented on the AT25DN256-XMHF-T?
Hardware write protection on the AT25DN256-XMHF-T is controlled by the active-low WP pin, which directly locks protected memory sectors independent of software state. When WP is driven low, program and erase operations to protected regions are blocked - even if the Write Enable Latch (WEL) is set. The WP pin is internally pulled high, so it may be left floating if unused, but external connection to VCC is recommended for noise immunity. This feature ensures the AT25DN256-XMHF-T remains immune to corruption during power transients or firmware crashes.
What is the structure and purpose of the OTP security register in the AT25DN256-XMHF-T?
The AT25DN256-XMHF-T includes a 128-byte One-Time Programmable (OTP) security register: 64 bytes are factory-programmed with a globally unique device identifier, and 64 bytes are user-programmable for keys, certificates, or calibration data. Once programmed, OTP bits cannot be erased or rewritten - providing tamper-resistant storage for secure boot, device authentication, or regulatory traceability. The AT25DN256-XMHF-T supports dedicated 9Bh (program) and 77h (read) opcodes for secure OTP access.
What erase block sizes does the AT25DN256-XMHF-T support, and why does granularity matter?
The AT25DN256-XMHF-T supports four erase granularities: 256-byte page, 4KB block, 32KB block, and full-chip. This flexibility avoids the wasted space common with fixed large-block Flash - e.g., updating a 1KB configuration file doesn't require erasing a 64KB sector. Smaller pages reduce write latency and energy consumption, while larger blocks optimize bulk firmware updates. The AT25DN256-XMHF-T's architecture enables efficient co-location of code and data in the same 256Kbit die without cross-contamination during partial updates.
AT25DN256-XMHF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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-TSSOP
AT25DN256-XMHF-T FAQ
1.How can I place an order for AT25DN256-XMHF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DN256-XMHF-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-XMHF-T reliable?
The price and inventory of AT25DN256-XMHF-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-XMHF-T is usually 5 days.
3.What payment methods are accepted for AT25DN256-XMHF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DN256-XMHF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DN256-XMHF-T?
AT25DN256-XMHF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DN256-XMHF-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-XMHF-T?
For technical support, including AT25DN256-XMHF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DN256-XMHF-T requirements.
6.How does Aetrix verify that AT25DN256-XMHF-T is sourced from the original manufacturer or authorized distributors?
All AT25DN256-XMHF-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-XMHF-T meets industry standards.
7.What is the process for return or replacement of AT25DN256-XMHF-T?
All AT25DN256-XMHF-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DN256-XMHF-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-XMHF-T part is unused and in its original packaging.
Return procedure for AT25DN256-XMHF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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