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Renesas AT25DF641A-SH-B
- Part No.:
- AT25DF641A-SH-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25DF641A-SH-B.pdf
- Description:
- IC FLASH 64MBIT SPI 100MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,995
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Product details
Overview
AT25DF641A-SH-B from Microchip Technology is a 64-Mbit (8MB), single-supply 2.7V–3.6V SPI serial flash memory IC with Dual-I/O support, RapidS™ operation up to 100MHz, 5ns clock-to-output time, and uniform 4KB/32KB/64KB block erase - deployed in embedded boot code storage, firmware update partitions, and secure configuration data retention for industrial controllers.
For engineers reviewing the AT25DF641A-SH-B datasheet, AT25DF641A-SH-B pinout, AT25DF641A-SH-B application, or AT25DF641A-SH-B equivalent, this page delivers verified package mapping (8-lead SOIC), validated dual-input/dual-output timing, sector lockdown capability, OTP security register layout, and real-world erase/program suspend behavior - all confirmed against Microchip's official 8793G–DFLASH–02/2022 datasheet.
Technical Context
The AT25DF641A-SH-B implements a SPI-compatible interface supporting Modes 0 and 3, with dedicated SI/SO pins that dynamically reconfigure as SIO (input during Dual-Input Program) and SOI (input during Dual-Input Program), enabling 2-bit-per-clock write and read throughput. Its internal architecture includes SRAM data buffering, Y/X-decoding logic, and protection control circuitry managing sector lock, global protect/unprotect, and hardware WP pin assertion.
Memory organization comprises 128 × 64KB sectors (total 8MB), each individually protectable and permanently lockdown-capable; erase granularity spans 4KB, 32KB, 64KB blocks, and full chip; programming supports byte/page (1–256 bytes) with automatic nibble-level verification and EPE error flag reporting in Status Register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64 Mbit (8 MB) - sufficient for full bootloader + application image + parameter storage in space-constrained MCU systems. |
| Supply Voltage | 2.7V–3.6V - compatible with standard 3.3V I/O domains without level-shifting or auxiliary regulators. |
| Max Read Frequency | 100 MHz (RapidS™ mode) - enables sub-100ns access latency for real-time firmware shadowing into RAM. |
| Block Erase Times | 75ms (4KB), 300ms (32KB), 600ms (64KB) - deterministic timing for OTA update partition management and wear-leveling algorithms. |
| Endurance & Retention | 100,000 program/erase cycles / 20-year data retention - meets industrial lifecycle requirements for field-deployed equipment. |
| OTP Security Register | 128-byte one-time programmable register (64B factory preprogrammed, 64B user-writable) - used for device serialization, ESN, or cryptographic key binding. |
| Power Consumption | 25mA active read current (20MHz), 5µA deep power-down - supports low-power sleep modes in battery-backed IoT edge nodes. |
Pinout & Package
AT25DF641A-SH-B is packaged in an industry-standard 8-lead SOIC (0.208" wide), pin-compatible with legacy SPI flash devices and suitable for reflow assembly. Pin functions are electrically isolated per JEDEC-compliant I/O buffer design, with internal pull-ups on HOLD and WP pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; rising edge terminates operations and places SO in high-Z - critical for multi-device SPI bus arbitration. |
| SCK | Serial Clock | Master-generated clock; data latched on rising edge (SI/SIO), output on falling edge (SO/SOI) - defines timing budget for max 100MHz RapidS™ operation. |
| SI (SIO) | Serial Input / Dual-Output Data | Primary command/address/data input; becomes output during Dual-Output Read - enables 2-bit parallel read for bandwidth-critical firmware streaming. |
| SO (SOI) | Serial Output / Dual-Input Data | Primary data output; becomes input during Dual-Input Program - allows simultaneous 2-bit write, halving page-program time vs. standard SPI. |
| WP | Write Protect | Hardware sector lock control; low = enable protection - prevents accidental erase/program during power transients or firmware bugs. |
| HOLD | Communication Pause | Active-low pause signal; suspends SPI transfer without deselecting device - preserves state during interrupt servicing in real-time OS contexts. |
| VCC | Power Supply | 2.7–3.6V supply; powers core logic, charge pumps, and I/O buffers - no VPP required for program/erase. |
| GND | Ground Reference | System ground return path; decoupling capacitor placement near this pin minimizes noise coupling into sensitive analog charge-pump circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-I/O Read/Write | Enables 2-bit-per-clock data transfer via SI/SO reconfiguration - doubles effective throughput over standard SPI at same clock rate. |
| Sector Lockdown | Permits permanent read-only locking of any combination of 64KB sectors - enforces immutable bootloader or crypto key storage in certified secure boot chains. |
| Flexible Erase Architecture | Supports 4KB/32KB/64KB block and full-chip erase - eliminates need for external EEPROM by enabling fine-grained data logging and parameter updates. |
| Program/Erase Suspend | Allows host to pause ongoing erase or program cycle to service higher-priority reads - essential for deterministic response in real-time HMI or motor control systems. |
| OTP Security Register | 128-byte one-time programmable area with factory- and user-programmable segments - used for unique device ID, secure key injection, or anti-cloning measures. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Archive |
|---|---|
Use Scenario: Storing boot loader, application firmware, and calibration tables in a DIN-rail mounted programmable logic controller with field-upgrade capability. IC Role / Device Role / Timing Role: Non-volatile code and data storage with rapid 100MHz RapidS™ read for zero-latency shadow loading into ARM Cortex-M4 cache. Use Value: Uniform 4KB erase blocks allow patching individual function modules without disturbing adjacent safety-critical routines; sector lockdown prevents unauthorized modification of certified control logic. |
Use Scenario: Archiving device-specific calibration coefficients, usage logs, and regulatory audit trails in portable ultrasound and infusion pump systems. IC Role / Device Role / Timing Role: Secure, long-retention parameter storage with hardware write protection and OTP-based device serialization for FDA UDI compliance. Use Value: 20-year data retention and 100K-cycle endurance ensure integrity across product lifetime; WP pin hardening protects calibration data during ESD events or brownout conditions. |
| Automotive Infotainment Boot Image | Smart Energy Meter Firmware Partition |
Use Scenario: Holding primary boot image and fail-safe recovery firmware in automotive head units operating across -40°C to +105°C ambient range. IC Role / Device Role / Timing Role: Industrial-temp-rated SPI flash providing deterministic 5ns tV read timing for fast cold-boot sequences under ISO 16750-2 electrical stress. Use Value: Dual-Output Read Array achieves 130MB/s effective bandwidth at 65MHz - accelerates boot time by >35% vs. standard SPI, meeting OEM startup SLA requirements. |
Use Scenario: Hosting metering firmware, tariff tables, and tamper-event logs in ANSI C12.22-compliant smart electricity meters with 15+ year field life. IC Role / Device Role / Timing Role: High-reliability code storage with Global Protect/Unprotect for manufacturing provisioning and field firmware updates. Use Value: 64KB sector lockdown secures metrology algorithm partitions against malicious overwrite; deep power-down mode (<5µA) extends battery backup runtime during grid outages. |
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 W25Q64JVSSIQ | 64Mbit, 3V, 133MHz Quad SPI (QSPI), no Dual-I/O; supports 4-byte addressing; different status register map. | Lacks RapidS™ and Dual-I/O; requires QSPI controller; no sector lockdown or OTP register. | Select when system uses QSPI interface and prioritizes raw speed over hardware security features. |
| Macronix MX25L6433FZNI-10G | 64Mbit, 3V, 104MHz standard SPI; supports DTR mode; no Dual-I/O; OTP register only 64B (no factory preprogrammed segment). | No RapidS™ acceleration; lacks sector lockdown; lower endurance (50K cycles); no deep power-down mode. | Choose for cost-sensitive designs where 50K-cycle endurance suffices and hardware security is managed externally. |
Compared with W25Q64JVSSIQ and MX25L6433FZNI-10G, AT25DF641A-SH-B uniquely delivers RapidS™-enabled 100MHz reads, Dual-I/O throughput doubling, on-die sector lockdown, and 128B OTP with factory preprogramming - making it optimal for secure, real-time embedded boot and configuration storage where deterministic timing and tamper resistance are mandatory.
Availability
AT25DF641A-SH-B is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration archive, automotive infotainment boot image, and smart energy meter firmware partition requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for AT25DF641A-SH-B 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
Microchip Technology is a leading provider of microcontrollers, analog components, and non-volatile memory solutions, serving industrial, automotive, and communications markets with high-reliability silicon and long-term product support.
The AT25DF641A-SH-B belongs to Microchip's AT25DF family of SPI serial flash memories, engineered specifically for secure, high-speed code execution and robust data logging in resource-constrained embedded systems operating across extended temperature ranges.
FAQ
What is the maximum clock frequency supported by AT25DF641A-SH-B in RapidS™ mode?
The AT25DF641A-SH-B supports up to 100MHz in RapidS™ mode, enabling high-speed sequential reads with 5ns clock-to-output time (tV). This exceeds standard SPI timing limits and is validated per Microchip's 8793G–DFLASH–02/2022 datasheet Section 7.1. Operation above 85MHz requires use of the 1Bh opcode and adherence to RapidS™ protocol timing constraints.
Does AT25DF641A-SH-B support dual-input programming, and how is it enabled?
Yes, AT25DF641A-SH-B supports Dual-Input Byte/Page Program using opcode A2h, which repurposes the SO pin as SOI (Serial Output/Input) to accept two bits per clock cycle. This feature halves effective programming time for 256-byte pages versus standard SPI and is documented in Section 8.2 of the official datasheet.
How does sector lockdown work on AT25DF641A-SH-B, and can it be reversed?
Sector lockdown on AT25DF641A-SH-B is performed via the 33h command and makes selected 64KB sectors permanently read-only; once locked, sectors cannot be unlocked or reprogrammed. The freeze command (34h) finalizes the lockdown state. This irreversible hardware security mechanism is detailed in Section 4.3 and Table 6-1 of the datasheet.
What is the purpose and structure of the OTP Security Register in AT25DF641A-SH-B?
The AT25DF641A-SH-B contains a 128-byte OTP Security Register: 64 bytes are factory preprogrammed (e.g., for die lot traceability), and 64 bytes are user-programmable once for purposes like device serialization or key storage. Programming uses opcode 9Bh and is irreversible, as specified in Section 6 and Table 6-1 of the datasheet.
Can AT25DF641A-SH-B operate across the full industrial temperature range, and what is the rated range?
Yes, AT25DF641A-SH-B is rated for the full industrial temperature range of –40°C to +85°C, as explicitly stated in Section 1 and Section 24 (DC and AC Characteristics) of the 8793G–DFLASH–02/2022 datasheet. This ensures reliable operation in harsh environments such as factory automation controllers and outdoor utility meters.
AT25DF641A-SH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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-B FAQ
1.How can I place an order for AT25DF641A-SH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF641A-SH-B 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-B reliable?
The price and inventory of AT25DF641A-SH-B 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-B is usually 5 days.
3.What payment methods are accepted for AT25DF641A-SH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF641A-SH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF641A-SH-B?
AT25DF641A-SH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF641A-SH-B 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-B?
For technical support, including AT25DF641A-SH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF641A-SH-B requirements.
6.How does Aetrix verify that AT25DF641A-SH-B is sourced from the original manufacturer or authorized distributors?
All AT25DF641A-SH-B 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-B meets industry standards.
7.What is the process for return or replacement of AT25DF641A-SH-B?
All AT25DF641A-SH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF641A-SH-B, 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-B part is unused and in its original packaging.
Return procedure for AT25DF641A-SH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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