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Renesas AT25DF641A-SH-T
- Part No.:
- AT25DF641A-SH-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25DF641A-SH-T.pdf
- Description:
- IC FLASH 64MBIT SPI 100MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,129
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Product details
Overview
AT25DF641A-SH-T from Adesto Technologies (acquired by Dialog Semiconductor, now part of Renesas) is a 64-Mbit serial NOR Flash memory IC with SPI interface, 2.7V–3.6V single supply, Dual-Output Read (up to 65 MHz), and Dual-Input Program support. It features uniform 4KB/32KB/64KB block erase, 128 × 64KB sectors, hardware write protection via WP pin, and 128-byte OTP security register - used in embedded boot code storage and firmware update partitions for industrial controllers.
For engineers reviewing the AT25DF641A-SH-T datasheet, AT25DF641A-SH-T pinout, AT25DF641A-SH-T application, or AT25DF641A-SH-T equivalent, key selection considerations include RapidS™ read performance (100 MHz), clock-to-output time (5 ns max), sector lockdown permanence, 20-year data retention, and SOIC-8 vs. DFN-8 package compatibility with existing PCB layouts.
Technical Context
The AT25DF641A-SH-T implements a standard SPI master-slave interface supporting Modes 0 and 3, with SCK inactive-high (Mode 3) or inactive-low (Mode 0); data latched on rising SCK edge and output on falling edge. Its internal architecture includes SRAM data buffer, Y/X decoders, and flash memory array segmented into 128 physical 64KB sectors.
Dual-I/O operation enables concurrent bit transfer: Dual-Output Read uses SO + SI (as SIO) to output two bits per SCK falling edge; Dual-Input Program uses SI + SO (as SOI) to input two bits per SCK rising edge - both requiring opcode 3Bh or A2h and one dummy byte, respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 64 Mbit (8 MB), organized as 128 × 64KB sectors - supports discrete code/data partitioning without external EEPROM. |
| Read frequency | Up to 100 MHz (RapidS™), 85 MHz (standard SPI), 65 MHz (Dual-Output Read) - enables sub-100 ns access latency in high-speed boot scenarios. |
| Timing: tV (clock-to-output) | 5 ns maximum - reduces wait states for CPU fetch cycles during XIP (execute-in-place) configurations. |
| Erase granularity | Uniform 4KB, 32KB, 64KB blocks + full chip erase - allows fine-grained firmware patching without erasing entire application image. |
| Endurance & retention | 100,000 program/erase cycles; 20 years data retention - validated for field-updatable industrial firmware with multi-year deployment cycles. |
| Power consumption | 25 mA active read current (20 MHz), 5 µA deep power-down - suitable for battery-backed or energy-constrained edge nodes. |
| OTP security register | 128 bytes (64 factory preprogrammed + 64 user-programmable) - stores ESN, cryptographic keys, or device-specific calibration data with irreversible write capability. |
Pinout & Package
AT25DF641A-SH-T is packaged in 8-lead SOIC (0.208" wide), pin-compatible with industry-standard serial flash footprints. Pin functions are electrically defined and validated per datasheet Rev. 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 SPI bus arbitration and SO high-impedance state. |
| SCK | Serial Clock | Master-generated clock; rising edge latches SI/SIO input, falling edge clocks SO/SOI output - defines timing for all SPI transactions. |
| SI (SIO) | Serial Input / Dual-Output | Standard input for commands/addresses/data; becomes output (SIO) during Dual-Output Read - enables 2-bit-per-cycle throughput without additional signal lines. |
| SO (SOI) | Serial Output / Dual-Input | Standard output for read data; becomes input (SOI) during Dual-Input Program - doubles programming bandwidth versus single-I/O mode. |
| WP | Write Protect | Hardware lock control; low = enables sector protection lockdown - prevents accidental or malicious writes when tied to system security logic. |
| HOLD | Communication Pause | Active-low suspend of SPI transfer without deselecting device - preserves internal state during interrupt servicing or bus sharing. |
| VCC | Power Supply | 2.7V–3.6V single rail; powers core, I/O, and charge pump - eliminates need for external VPP or voltage translators. |
| GND | Ground Reference | System ground return path; required for stable logic thresholds and noise immunity in mixed-signal embedded systems. |
Key Features
| Feature | Design Value |
|---|---|
| RapidS™ high-speed read | 100 MHz operation with 5 ns tV enables real-time XIP execution from flash in Cortex-M4/M7 microcontrollers. |
| Dual-I/O interface | Simultaneous 2-bit transfers on SO/SI reduce read/write transaction time by ~50% versus standard SPI - critical for OTA firmware download latency. |
| Sector lockdown | Permanent read-only locking of any 64KB sector combination - enforces immutable bootloader or secure key storage in certified industrial devices. |
| Global protect/unprotect | Single-command array-wide protection state change - streamlines manufacturing programming and field recovery workflows. |
| Program/erase suspend | Pause ongoing erase or program cycle to service higher-priority reads - ensures deterministic response time in real-time control loops. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Partition |
|---|---|
Use Scenario: Storing certified firmware images and configuration parameters in programmable logic controllers operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Non-volatile boot code and parameter storage with hardware write protection and sector lockdown to prevent unauthorized modification. Use Value: 20-year data retention and 100K endurance ensure firmware integrity over full product lifecycle without recalibration or replacement. | Use Scenario: Isolating FDA-cleared bootloader code from updatable application firmware in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant boot partition with OTP register storing device-specific cryptographic keys and calibration signatures. Use Value: Sector lockdown prevents runtime corruption of bootloader; 5 ns tV supports deterministic boot timing under IEC 62304 Class C requirements. |
| Automotive Infotainment Update Cache | Smart Energy Meter Data Logging |
Use Scenario: Caching differential firmware updates prior to atomic installation in head-unit ECUs with ASIL-B functional safety constraints. IC Role / Device Role / Timing Role: High-reliability intermediate storage with Dual-Input Program enabling fast update ingestion over CAN-FD gateway interfaces. Use Value: 65 MHz Dual-Output Read accelerates post-update verification; 4KB erase granularity minimizes downtime during partial reflash. | Use Scenario: Recording time-stamped metering data (voltage, current, kWh) in utility-grade smart meters deployed in harsh outdoor environments. IC Role / Device Role / Timing Role: Robust data logger with individual sector protection - isolates firmware (protected) from rotating log buffers (unprotected). Use Value: 300 ms typical 32KB erase time enables efficient wear-leveling across 128 sectors; deep power-down (5 µA) extends battery life in backup mode. |
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, 1.8V–3.6V supply, Quad SPI (QSPI) capable, no Dual-I/O; 133 MHz max read, 8-pin SOIC package. | Lacks RapidS™ and Dual-I/O modes; requires QSPI controller support for quad mode; no sector lockdown feature. | Select when QSPI bandwidth > Dual-I/O benefit and lower VCC min (1.8V) is required; verify absence of lockdown does not impact security architecture. |
| Macronix MX25L6433FZNI-10G | 64 Mbit, 2.7V–3.6V, standard SPI only (no Dual-I/O), 104 MHz max read, 8-pin SOIC, 128-byte OTP register. | No RapidS™ acceleration or Dual-I/O; identical 4KB/32KB/64KB erase, same OTP size, but no sector lockdown or Global Protect command set. | Choose for cost-sensitive designs where 104 MHz read speed suffices and permanent sector lockdown is unnecessary; pinout compatible but feature subset reduced. |
Compared with W25Q64JVSSIQ and MX25L6433FZNI-10G, AT25DF641A-SH-T delivers unique RapidS™ timing and Dual-I/O throughput for latency-critical boot/firmware operations, while its sector lockdown provides hardware-enforced immutability unmatched by alternatives - making it optimal for safety- or security-certified embedded systems.
Availability
AT25DF641A-SH-T is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive infotainment, and smart energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT25DF641A-SH-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, high-performance serial flash memories before its acquisition by Dialog Semiconductor in 2020; Dialog was subsequently acquired by Renesas Electronics in 2021.
The AT25DF641A product line targets embedded systems needing fast, secure, and reliable non-volatile code and data storage - emphasizing rapid boot, firmware update resilience, and hardware-based security primitives like sector lockdown and OTP registers.
FAQ
What is the maximum clock frequency supported by AT25DF641A-SH-T in RapidS™ mode?
The AT25DF641A-SH-T supports up to 100 MHz in RapidS™ mode, enabling high-speed sequential reads with a guaranteed clock-to-output time (tV) of 5 ns maximum. This specification is validated under 2.7V–3.6V supply and industrial temperature range (–40°C to +85°C). The 100 MHz rating applies specifically to RapidS™-optimized opcodes (e.g., 1Bh Read Array), not standard SPI commands.
Does AT25DF641A-SH-T support true dual-line data transfer during both read and program operations?
Yes, AT25DF641A-SH-T supports Dual-Output Read (using SO and SI pins simultaneously) and Dual-Input Program (using SI and SO pins simultaneously), each enabled by dedicated opcodes (3Bh and A2h). Both modes require one dummy byte and operate at up to 65 MHz (read) or 100 MHz (program), doubling effective throughput versus single-I/O SPI without additional pins.
How does sector lockdown work on AT25DF641A-SH-T, and is it reversible?
Sector lockdown on AT25DF641A-SH-T is a permanent, one-time hardware lock applied to any combination of its 128 × 64KB sectors using the 33h command. Once locked, a sector becomes read-only for life - no software or hardware method exists to reverse it. This feature is intended for immutable bootloader or cryptographic key storage in security-critical applications.
What package type is used for AT25DF641A-SH-T, and is it pin-compatible with other 8-pin serial flash devices?
AT25DF641A-SH-T uses an 8-lead SOIC package (0.208" wide), fully compliant with JEDEC MS-012. It is pin-compatible with standard SPI flash footprints including Winbond, Macronix, and Spansion equivalents - CS, SCK, SI, SO, WP, HOLD, VCC, GND occupy identical positions and perform identical functions per SPI protocol conventions.
Can AT25DF641A-SH-T be operated at 2.5V supply voltage?
No, AT25DF641A-SH-T requires a minimum supply voltage of 2.7V and operates within 2.7V–3.6V. Operation below 2.7V is outside specification and may result in unreliable read/write/erase behavior, status register misreads, or premature endurance failure. Systems requiring 2.5V operation should evaluate alternative flash devices rated for that voltage range.
AT25DF641A-SH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
AT25DF641A-SH-T FAQ
1.How can I place an order for AT25DF641A-SH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF641A-SH-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-SH-T reliable?
The price and inventory of AT25DF641A-SH-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-SH-T is usually 5 days.
3.What payment methods are accepted for AT25DF641A-SH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF641A-SH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF641A-SH-T?
AT25DF641A-SH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF641A-SH-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-SH-T?
For technical support, including AT25DF641A-SH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF641A-SH-T requirements.
6.How does Aetrix verify that AT25DF641A-SH-T is sourced from the original manufacturer or authorized distributors?
All AT25DF641A-SH-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-SH-T meets industry standards.
7.What is the process for return or replacement of AT25DF641A-SH-T?
All AT25DF641A-SH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF641A-SH-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-SH-T part is unused and in its original packaging.
Return procedure for AT25DF641A-SH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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