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Renesas AT25DF641A-MH-T
- Part No.:
- AT25DF641A-MH-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT25DF641A-MH-T.pdf
- Description:
- IC FLASH 64MBIT SPI 100MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,452
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Product details
Overview
AT25DF641A-MH-T from Adesto Technologies (now part of Dialog Semiconductor, acquired by Renesas) is a 64-Mbit serial NOR Flash memory IC with SPI interface, supporting dual-I/O read/write, RapidS™ operation up to 100 MHz, 4KB/32KB/64KB uniform erase blocks, and hardware write protection via WP pin. It operates from 2.7V–3.6V and targets embedded code shadowing and secure data storage in industrial control and IoT edge nodes.
For engineers reviewing the AT25DF641A-MH-T datasheet, AT25DF641A-MH-T pinout, AT25DF641A-MH-T application, or AT25DF641A-MH-T equivalent, key selection considerations include dual-output read timing (65 MHz), sector lockdown permanence, 128-byte OTP security register (64B factory + 64B user), 5 ns clock-to-output delay, and JEDEC-standard ID read compatibility.
Technical Context
The AT25DF641A-MH-T implements a SPI-compatible interface supporting Modes 0 and 3, with dual-input programming (SO as input) and dual-output reading (SI as output), enabling 2-bit-per-clock data transfer. Its internal architecture includes SRAM data buffering, Y/X-decoding logic, and dedicated control for sector protection, lockdown, and program/erase suspend/resume.
It features four-tiered erase granularity (4KB/32KB/64KB blocks + full chip), 128 × 64KB sectors with individual lock/unlock capability, and hardware-controlled sector locking via the WP pin. The device integrates a 128-byte OTP register for ESN, keys, or serialization, with factory-preprogrammed and user-programmable segments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64 Mbit (8 MB); supports code shadowing and mixed code/data storage without external EEPROM. |
| Supply Voltage | 2.7V–3.6V; single-supply operation eliminates need for charge pumps or auxiliary voltages. |
| Max Clock Frequency | 100 MHz (RapidS™ mode); enables high-throughput firmware updates and boot-time reads. |
| Read Latency | 5 ns tV (clock-to-output); reduces CPU wait states during sequential instruction fetch. |
| Erase Granularity | Uniform 4KB, 32KB, 64KB blocks + full chip; minimizes wasted space in modular firmware partitioning. |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention; suitable for field-upgradable industrial firmware. |
| Power Consumption | 25 mA active read current (20 MHz); 5 µA deep power-down; enables low-power sleep modes in battery-operated devices. |
Pinout & Package
AT25DF641A-MH-T is packaged in an 8-lead SOIC (0.208" wide), RoHS-compliant, green package. Pin functions are validated per datasheet revision 8793G–DFLASH–02/2022.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must transition high→low to initiate command, low→high to terminate; controls standby entry and SO high-Z state. |
| SCK | Serial Clock | Master-generated clock; rising edge latches SI/SIO input, falling edge clocks SO/SOI output; defines SPI Mode 0/3 timing. |
| SI (SIO) | Serial Input / Dual-Output Read Data | Input for commands/addresses/data; becomes output (SIO) during Dual-Output Read to deliver bit[6:0] of each byte alongside SO's bit[7]. |
| SO (SOI) | Serial Output / Dual-Input Program Data | Output for read data; becomes input (SOI) during Dual-Input Program to accept bit[6:0] alongside SI's bit[7]. |
| WP | Write Protect | Hardware lock control; low assertion permanently disables program/erase on protected sectors unless globally unprotected. |
| HOLD | Communication Hold | Pauses ongoing SPI transfer without deselecting device; requires CS asserted and SCK low to activate; preserves internal state. |
| VCC | Power Supply | 2.7V–3.6V supply; powers all logic, memory array, and I/O buffers; no separate VPP required. |
| GND | Ground Reference | System ground return path; critical for noise immunity and stable erase/program voltage margins. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Read Array (3Bh) | Delivers 2 bits/clock cycle at up to 65 MHz, doubling effective read bandwidth versus standard SPI read. |
| Sector Lockdown | Makes any combination of 64KB sectors permanently read-only-prevents runtime or malicious overwrite of boot code or keys. |
| 128-byte OTP Security Register | 64 bytes factory-programmed (e.g., unique ID), 64 bytes user-writable once-enables secure device authentication and key binding. |
| Program/Erase Suspend & Resume | Allows interruption of long erase (e.g., 600 ms 64KB block) to service higher-priority reads, then resume without data loss. |
| Global Protect/Unprotect | Single-command bulk sector protection or unprotection-reduces manufacturing overhead and simplifies initial programming flow. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Protection |
|---|---|
|
Use Scenario: Storing and executing firmware for programmable logic controllers with field-upgrade capability and safety-critical integrity requirements. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast 100 MHz RapidS™ read for low-latency boot and real-time task loading. Use Value: Uniform 4KB erase enables patch-level updates without erasing entire application; sector lockdown prevents unauthorized modification of safety routines. |
Use Scenario: Securing boot loader and regulatory-certified application code in portable diagnostic equipment requiring FDA-grade traceability. IC Role / Device Role / Timing Role: Trusted code vault with OTP-based device serialization and permanent lockdown of bootloader region. Use Value: 128-byte OTP register stores unique ESN and cryptographic keys; lockdown ensures bootloader remains immutable across device lifecycle. |
| Smart Meter Data Logging | Automotive Telematics OTA Module |
|
Use Scenario: Logging time-stamped energy consumption data alongside firmware in utility-grade smart meters operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Dual-role memory: 64KB sectors store firmware; other sectors hold encrypted usage logs with wear-leveling via 100K-cycle endurance. Use Value: 32KB/64KB block erase optimizes log rotation efficiency; deep power-down (5 µA) extends battery life during idle periods. |
Use Scenario: Hosting OTA update images and rollback partitions in automotive infotainment gateways requiring AEC-Q100 alignment and secure boot. IC Role / Device Role / Timing Role: High-reliability flash for dual-image storage (active + candidate), with hardware WP pin enforcing write-protection during vehicle ignition. Use Value: Hardware write protection via WP pin prevents accidental overwrites during CAN bus noise events; JEDEC ID enables automated BOM verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial NOR Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q64JVSSIQ | 64 Mbit, 3.3V, 133 MHz max clock, Quad SPI support (vs. AT25DF641A-MH-T's Dual-I/O only); no RapidS™ or sector lockdown. | Lacks permanent sector lockdown and OTP register; requires software-managed protection schemes. | Select when higher clock speed and quad I/O bandwidth are prioritized over hardware-enforced immutability. |
| Macronix MX25L6433FZNI-10G | 64 Mbit, 3.3V, 104 MHz max clock, Dual/Quad SPI, no RapidS™; includes software write protection but no hardware WP pin or lockdown. | No hardware write protect pin or sector lockdown-relies on status register bits vulnerable to glitch-induced corruption. | Prefer for cost-sensitive designs where full hardware security features are not mandated by certification standards. |
Compared with W25Q64JVSSIQ and MX25L6433FZNI-10G, the AT25DF641A-MH-T uniquely delivers hardware-enforced sector lockdown, dedicated WP pin for fail-safe protection, and RapidS™-optimized 100 MHz read performance-making it optimal for safety- or security-critical firmware storage where tamper resistance is non-negotiable.
Availability
AT25DF641A-MH-T is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics, smart metering, and automotive telematics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT25DF641A-MH-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 designed ultra-low-power, feature-rich serial Flash memories before its acquisition by Dialog Semiconductor in 2020, now part of Renesas Electronics.
The AT25DF641A product line targets secure, high-reliability embedded systems requiring hardware-enforced data integrity, rapid code execution, and industrial temperature operation-especially where firmware immutability and device authentication are mandatory.
FAQ
What is the maximum clock frequency supported by AT25DF641A-MH-T in RapidS™ mode?
The AT25DF641A-MH-T supports up to 100 MHz in RapidS™ mode using the 1Bh opcode, enabling the fastest possible sequential read throughput. This exceeds standard SPI limits and reduces boot latency in resource-constrained microcontrollers. The device maintains full functionality-including dual-output read and program/erase suspend-at this frequency. AT25DF641A-MH-T datasheet section 7.1 confirms tV ≤ 5 ns at 100 MHz operation.
Does AT25DF641A-MH-T support true quad-SPI (QSPI) interface?
No, AT25DF641A-MH-T does not support quad-SPI. It supports standard SPI (single I/O), Dual-Output Read (SO + SI), and Dual-Input Program (SO + SI), but lacks dedicated QSPI pins or command set. The device uses only four signal lines (CS, SCK, SI, SO) and relies on mode switching-not parallel data lanes-for enhanced bandwidth. AT25DF641A-MH-T's dual-I/O capability delivers 2-bit-per-clock transfer, distinct from true quad-SPI's 4-bit-per-clock operation.
How does the sector lockdown feature work on AT25DF641A-MH-T?
Sector lockdown on AT25DF641A-MH-T uses the 33h command to permanently disable program/erase operations on any selected 64KB sector-irreversible even after power cycles or global unprotect. Once locked, the sector becomes read-only for the device's lifetime. This is implemented in hardware, independent of status register bits. AT25DF641A-MH-T's lockdown is ideal for protecting bootloader regions or cryptographic keys against physical or firmware-level attacks.
What is the purpose of the 128-byte OTP Security Register in AT25DF641A-MH-T?
The 128-byte OTP Security Register in AT25DF641A-MH-T contains 64 bytes preprogrammed by the manufacturer (e.g., unique device ID) and 64 bytes user-programmable once. It serves as a tamper-resistant location for electronic serial numbers, encryption keys, calibration data, or license tokens. Programming is irreversible and requires the 9Bh command. AT25DF641A-MH-T's OTP register is electrically isolated from main array operations, ensuring reliability under repeated reboots or brownout conditions.
Can AT25DF641A-MH-T operate across the full industrial temperature range?
Yes, AT25DF641A-MH-T is specified for operation from –40°C to +85°C ambient temperature, meeting full industrial grade requirements. All parameters-including 100 MHz RapidS™ read, 5 ns tV, 100,000-cycle endurance, and deep power-down current-are guaranteed across this range. The device uses temperature-compensated internal timing circuits and undergoes extended burn-in testing. AT25DF641A-MH-T's SOIC package (MH suffix) is qualified for industrial thermal cycling per JESD22-A104.
AT25DF641A-MH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 64Mbit
- Memory Organization:
- 256 Bytes x 32K pages
- Memory Interface:
- SPI
- Clock Frequency:
- 100 MHz
- Write Cycle Time - Word, Page:
- 30µs, 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (5x6)
AT25DF641A-MH-T FAQ
1.How can I place an order for AT25DF641A-MH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF641A-MH-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 AT25DF641A-MH-T reliable?
The price and inventory of AT25DF641A-MH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DF641A-MH-T is usually 5 days.
3.What payment methods are accepted for AT25DF641A-MH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF641A-MH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF641A-MH-T?
AT25DF641A-MH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF641A-MH-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 AT25DF641A-MH-T?
For technical support, including AT25DF641A-MH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF641A-MH-T requirements.
6.How does Aetrix verify that AT25DF641A-MH-T is sourced from the original manufacturer or authorized distributors?
All AT25DF641A-MH-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 AT25DF641A-MH-T meets industry standards.
7.What is the process for return or replacement of AT25DF641A-MH-T?
All AT25DF641A-MH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF641A-MH-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 AT25DF641A-MH-T part is unused and in its original packaging.
Return procedure for AT25DF641A-MH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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