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Renesas AT25DF641A-MH-Y
- Part No.:
- AT25DF641A-MH-Y
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT25DF641A-MH-Y.pdf
- Description:
- IC FLASH 64MBIT SPI 100MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,592
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Product details
Overview
AT25DF641A-MH-Y from Adesto Technologies (now part of Dialog Semiconductor, acquired by Renesas) is a 64-Mbit serial NOR Flash memory IC with SPI interface, supporting RapidS™ and Dual-I/O read/write operations. It operates from 2.7V to 3.6V, delivers up to 100MHz read speed (RapidS), features uniform 4KB/32KB/64KB erase blocks, 128×64KB sectors, hardware write protection via WP pin, and 128-byte OTP security register. It is used for code shadowing and secure data storage in embedded microcontroller boot systems.
For engineers reviewing the AT25DF641A-MH-Y datasheet, AT25DF641A-MH-Y pinout, AT25DF641A-MH-Y application, or AT25DF641A-MH-Y equivalent, this page provides verified technical context, validated pin functions, real-world use cases, and confirmed alternative parts - all grounded in the official 8793G–DFLASH–02/2022 datasheet and Renesas product documentation.
Technical Context
The AT25DF641A-MH-Y implements a dual-I/O SPI architecture with dedicated SI/SO pins that dynamically reconfigure as SIO/SOI during Dual-Output Read and Dual-Input Program commands. Its internal address counter enables continuous sequential reads with automatic wraparound at 7FFFFFh boundary.
It integrates sector-level protection logic with Global Protect/Unprotect, individual sector lock/unlock, and permanent Sector Lockdown - all controlled via dedicated opcodes (36h/39h/33h/34h) and enforced by hardware WP pin assertion. The 128-byte OTP register includes 64 bytes factory-programmed and 64 bytes user-programmable for ESN, keys, or serialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64 Mbit (8 MB); supports full chip erase and flexible 4KB/32KB/64KB block erases. |
| Supply Voltage | 2.7V–3.6V; single supply - no VPP or charge pump required for program/erase. |
| Max Clock Frequency | 100 MHz (RapidS™ read); enables 5 ns clock-to-output (tV) for high-speed boot loading. |
| Erase Endurance | 100,000 program/erase cycles per sector; validated for long-life firmware update partitions. |
| Data Retention | 20 years at 85°C; meets industrial-grade reliability for unattended embedded deployments. |
| Power Consumption | 25 mA active read current (20 MHz), 5 µA deep power-down - suitable for battery-backed systems. |
| OTP Security Register | 128-byte one-time programmable register: 64 B factory preprogrammed, 64 B user-writable for secure key storage. |
Pinout & Package
AT25DF641A-MH-Y is available in an 8-lead SOIC (0.208" wide) package. Pin functions are electrically validated per Table 2-1 and Figure 2-1 of the official datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; rising edge ends operation; required for command initiation and device deselection. |
| SCK | Serial Clock | Controls data timing; input only; data latched on rising edge, output clocked on falling edge. |
| SI (SIO) | Serial Input / Dual-Output | Input for standard SPI; becomes output (SIO) during Dual-Output Read to double data rate. |
| SO (SOI) | Serial Output / Dual-Input | Output for standard SPI; becomes input (SOI) during Dual-Input Program to double write bandwidth. |
| WP | Write Protect | Hardware lock control; low-active; internally pulled high; enables sector-level physical write disable. |
| HOLD | Communication Hold | Pauses ongoing SPI transfer without deselecting CS; requires CS asserted and SCK low to activate. |
| VCC | Power Supply | 2.7–3.6 V main supply; powers core logic, I/O buffers, and Flash array. |
| GND | Ground Reference | System ground return; must be low-impedance connection for stable erase/program margins. |
Key Features
| Feature | Design Value |
|---|---|
| RapidS™ High-Speed Read | 100 MHz operation with 5 ns tV enables sub-100 µs boot code fetch from first instruction. |
| Dual-I/O Programmability | Dual-Input Program and Dual-Output Read reduce effective clock cycles per byte by 2× vs standard SPI. |
| Fine-Granularity Erase | Uniform 4KB erase blocks allow independent firmware module updates without disturbing adjacent code/data. |
| Sector Lockdown | Any combination of 64KB sectors can be permanently set read-only - prevents runtime corruption of bootloader or crypto keys. |
| OTP Security Register | 128-byte field with factory + user segments supports unique device ID, secure key injection, and anti-cloning measures. |
Applications
| Secure Bootloader Storage | Firmware Over-the-Air (OTA) Partition |
|---|---|
Use Scenario: Storing immutable bootloader code in a tamper-resistant region of Flash memory. IC Role / Device Role / Timing Role: Non-volatile code storage with hardware-enforced read-only lockdown of critical 64KB sector containing reset vector and signature verification routines. Use Value: Prevents malicious overwrite of boot code via Sector Lockdown and WP pin; ensures deterministic startup even after failed OTA update. |
Use Scenario: Hosting dual firmware images for atomic OTA updates in IoT edge nodes. IC Role / Device Role / Timing Role: Dual 32KB–64KB partitions managed by MCU firmware; one active, one staging - erased and rewritten independently using 32KB Block Erase. Use Value: Enables zero-downtime firmware swaps with guaranteed rollback; fine-grained erase avoids full-chip delays (>600 ms). |
| Industrial HMI Configuration Data | Medical Device Calibration Storage |
Use Scenario: Persisting UI language packs, screen layouts, and user preferences across power cycles. IC Role / Device Role / Timing Role: Data storage partition protected via individual sector unprotect/protect sequence during configuration save. Use Value: Allows selective modification without risking program code integrity; Global Protect simplifies factory initialization. |
Use Scenario: Storing sensor calibration coefficients and regulatory audit logs in Class II medical equipment. IC Role / Device Role / Timing Role: Secure 4KB sector holding factory-calibrated values; locked down post-calibration and verified via OTP-stored checksum. Use Value: Meets IEC 62304 traceability requirements; 20-year retention ensures lifetime device validity without recalibration. |
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 |
|---|---|---|---|
| S25FL164K0XMFI010 | 4-bit Quad SPI (QSPI) interface; 80 MHz max clock; no Dual-I/O mode; 1.8V/3.3V dual supply option. | Lacks RapidS™ and Dual-I/O; requires QSPI controller; better suited for high-throughput streaming vs. mixed code/data partitioning. | Choose when migrating to QSPI-based SoCs and prioritizing bandwidth over legacy SPI compatibility. |
| W25Q64JVSSIQ | Standard SPI + Quad SPI; 133 MHz max; no RapidS™; 1.8V/3.3V support; smaller 4KB sectors (2048 vs 128), no Sector Lockdown. | Higher density flexibility but lacks permanent lockdown; OTP register limited to 3 × 256-bit security registers. | Prefer for cost-sensitive consumer designs where permanent sector locking is not required and Quad SPI is available. |
Compared with S25FL164K0XMFI010 and W25Q64JVSSIQ, the AT25DF641A-MH-Y uniquely combines RapidS™ acceleration, Dual-I/O bandwidth doubling, hardware-sector lockdown, and factory/user OTP segmentation - making it optimal for safety-critical boot and secure update architectures where SPI compatibility and tamper resistance are mandatory.
Availability
AT25DF641A-MH-Y is available at Aetrix Electronics and suitable for industrial HMI, medical device firmware, automotive telematics boot storage, and secure IoT edge node applications requiring stable component supply and long-term lifecycle support.
Supply support for AT25DF641A-MH-Y 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 fast boot, robust firmware update, and cryptographic key protection - with emphasis on industrial, medical, and automotive applications demanding 20-year data retention and hardware-enforced security.
FAQ
What is the maximum operating frequency of the AT25DF641A-MH-Y in RapidS™ mode?
The AT25DF641A-MH-Y supports up to 100 MHz in RapidS™ mode, enabling high-speed sequential reads with a clock-to-output time (tV) of 5 ns maximum. This performance is validated under 2.7–3.6 V supply and industrial temperature range (–40°C to +85°C), and is distinct from standard SPI mode (85 MHz max). The AT25DF641A-MH-Y achieves this via optimized internal timing and dual-edge data capture in RapidS™ protocol.
Does the AT25DF641A-MH-Y support Quad SPI (QSPI) interface?
No, the AT25DF641A-MH-Y does not support Quad SPI. It supports standard SPI (Modes 0 and 3) and enhanced Dual-I/O modes - Dual-Output Read and Dual-Input Program - which use SI and SO pins bidirectionally to achieve 2× throughput versus standard SPI. QSPI requires four I/O lines (IO0–IO3); the AT25DF641A-MH-Y has only two bidirectional data lines (SI/SO) and is not compatible with QSPI command sets or timing.
How many sectors does the AT25DF641A-MH-Y have, and what is their size?
The AT25DF641A-MH-Y contains 128 uniform sectors, each 64KB in size, totaling 8 MB (64 Mbit). Each sector can be individually protected, unprotected, or permanently locked down via dedicated commands (36h, 39h, 33h). The memory also supports finer-granularity erases: 4KB (20h), 32KB (52h), and full chip (60h/C7h), allowing precise partitioning for code, config, and data storage within the same AT25DF641A-MH-Y device.
Can the AT25DF641A-MH-Y be used in 1.8V systems?
No, the AT25DF641A-MH-Y is specified for 2.7V to 3.6V operation only. It lacks 1.8V support - unlike some newer serial Flash devices such as the Winbond W25Q64JV or Cypress S25FL164K. Attempting to operate the AT25DF641A-MH-Y below 2.7V may result in unreliable program/erase behavior, status register misreads, or failure to enter Deep Power-Down mode. System design must ensure stable 2.7–3.6 V rail for reliable AT25DF641A-MH-Y operation.
What is the purpose and structure of the OTP Security Register in the AT25DF641A-MH-Y?
The AT25DF641A-MH-Y includes a 128-byte One-Time Programmable (OTP) Security Register: 64 bytes are factory preprogrammed (e.g., device serial number), and 64 bytes are user-programmable via 9Bh command. Once written, OTP bits cannot be altered. It is used for secure device identification, electronic serial numbers (ESN), cryptographic key storage, and anti-counterfeiting. The AT25DF641A-MH-Y validates OTP writes via status bit and supports read-back with 77h command - critical for secure provisioning workflows.
AT25DF641A-MH-Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- 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-Y FAQ
1.How can I place an order for AT25DF641A-MH-Y through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF641A-MH-Y 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-Y reliable?
The price and inventory of AT25DF641A-MH-Y 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-Y is usually 5 days.
3.What payment methods are accepted for AT25DF641A-MH-Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF641A-MH-Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF641A-MH-Y?
AT25DF641A-MH-Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF641A-MH-Y 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-Y?
For technical support, including AT25DF641A-MH-Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF641A-MH-Y requirements.
6.How does Aetrix verify that AT25DF641A-MH-Y is sourced from the original manufacturer or authorized distributors?
All AT25DF641A-MH-Y 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-Y meets industry standards.
7.What is the process for return or replacement of AT25DF641A-MH-Y?
All AT25DF641A-MH-Y units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF641A-MH-Y, 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-Y part is unused and in its original packaging.
Return procedure for AT25DF641A-MH-Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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