AT25DF641A-SH-T - 64Mbit SPI/Quad SPI NOR Flash, SOIC-8 | Renesas
MPN: AT25DF641A-SH-T ✗ اختتامِ زندگیAT25DF641A-SH-T جائزہ
A NOR flash memory is a non-volatile storage technology in which the cells are wired in parallel (unlike NAND), giving byte-level random read access at the cost of larger cell area. Within the memory hierarchy, this places NOR above NAND in read granularity and below DRAM/SRAM in write speed. "Serial" NOR further packages that array behind a low-pin-count SPI interface, replacing legacy parallel-NOR footprints on modern boards; families with "Quad SPI" extend the 4-wire bus to 4 data lines for higher read bandwidth at the same clock.
Key features of the AT25DF641A include 64 Mbit density (8 MB), 100 MHz single-I/O SPI clock, Dual-I/O (DIO) read/program, deep power-down mode below 5 µA typical, 4 KB sector erase granularity, JEDEC manufacturer/device-ID read, and a write-protect pin for hardware security. The SOIC-8 (208 mil, "SH") body is the de-facto industry pinout for SPI flash, dropping directly onto 8-SOIC land patterns rated for hand or reflow soldering.
Internally the device uses a sector-erase architecture with 256-byte page program granularity. A typical application pairs the AT25DF641A as a boot/code-shadow store: the host MCU copies a small bootloader from flash into internal SRAM at reset, then DMA-streams the larger application image from the same flash to external SDRAM for XIP-free execution. The same part also serves as a low-power data-logging sink, where 256-byte page writes minimize per-byte energy.
Typical applications include IoT firmware storage, smart-home hub boot devices, consumer-electronics config/asset logging, industrial HMI code storage, automotive infotainment boot (where AEC-Q100 sister parts such as AT25QF641B are used), and Wi-Fi/BLE module co-storage with the radio SoC. Choose the AT25DF641A-SH-T over SPI NAND when byte-level read access is required (e.g. execute-in-place via QSPI on a Cortex-M4); choose SPI NAND when cost-per-bit dominates.
When laying out the PCB, place a 0.1 µF decoupling capacitor within 5 mm of VCC and keep the SCK trace short and length-matched to the host. Respect tVSL (VCC-min to chip-access) of typically 30 ms after power-up before issuing the first command, and assert /WP or /HOLD only while SCK is low to avoid false framing.
This page synthesizes distributor pricing, same-package drop-in alternatives including the AT25QF641B-SHB-T Quad-SPI successor, and practical design notes not consolidated in any single manufacturer document.
کے لیے ڈراپ اِن متبادل AT25DF641A-SH-T — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں AT25DF641A-SH-T (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Interface, Memory Type, Operating Temperature, Package, Supply Voltage (VCC).
AT25QF641B-SHB-T
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AT25DF641A-SH-B
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →AT25DF081A-SH-B
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →W25Q64JVSSIQ
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
MX25L6406EZNI-10G
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
SST26VF064B-104I/SM
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AT25DF641A-SH-T زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| میموری ٹائپ | NOR Flash |
| Density | 64 Mbit (8 MB) |
| انٹرفیس | SPI (Single/Dual I/O), Serial Peripheral Interface compatible |
| Clock Frequency (max) | 100 MHz (Single-I/O) |
| Supply Voltage (VCC) | 2.7 V to 3.6 V (single supply) |
| آپریٹنگ درجہ حرارت | -40 C to +85 C (industrial) |
| پیکیج | 8-SOIC (SOIC-W 208 mil, "SH") |
| ماؤنٹنگ ٹائپ | Surface Mount |
| Page Size (program) | 256 bytes |
| Sector Erase Sizes | 4 KB / 32 KB / 64 KB uniform |
| Sector Architecture | Uniform 4 KB sectors |
| Write-Protect Pin | Yes (/WP) |
| Hold Pin | Yes (/HOLD) |
| JEDEC ID Read | Yes |
| MSL لیول | 3 (per JEDEC J-STD-020, typical for SOIC flash) |
| RoHS اسٹیٹس | Compliant (Green) |
| Lead-Free | Yes |
| لائف سائیکل کی حالت | Not Recommended for New Designs (NRND), see AT25QF641B-SHB-T |
| Packaging | Tape & Reel (suffix -T) |
AT25DF641A-SH-T پن کنفیگریشن
| پن 1 | /CS — Chip Select, active low; enables SPI communication when pulled low |
| پن 2 | SO / SIO1 — Serial Output (Single-I/O) or Bidirectional I/O Data 1 (Dual/Quad-I/O) |
| پن 3 | /WP / SIO2 — Write-Protect (active low) or Bidirectional I/O Data 2 (Quad-I/O) |
| پن 4 | GND — Ground reference |
| پن 5 | SI / SIO0 — Serial Input (Single-I/O) or Bidirectional I/O Data 0 (Dual/Quad-I/O) |
| پن 6 | SCK — Serial Clock from host MCU |
| پن 7 | /HOLD / SIO3 — Hold (active low, pauses SPI when SCK low) or Bidirectional I/O Data 3 (Quad-I/O) |
| پن 8 | VCC — Power supply, 2.7 V to 3.6 V |
عام استعمالات
AT25DF641A-SH-T کے لیے موزوں ہے 7 ایپلیکیشنs: IoT Firmware Boot Shadowing, Smart-Home Hub Boot and Config Storage, Consumer Electronics Config / Asset Logging, Industrial HMI Code Storage, Wi-Fi / BLE Module Co-Storage, Automotive Infotainment Boot (AEC-Q100 context), Test & Measurement Data Logging.
IoT Firmware Boot Shadowing
The AT25DF641A-SH-T is well suited to IoT firmware boot-shadowing on Cortex-M0/M4 hosts because its 64 Mbit (8 MB) density holds the full firmware image including calibration tables and OTA staging slots, while the 100 MHz SPI clock lets the MCU DMA-stream the entire 8 MB into external SDRAM in roughly 700 ms. Placed on the SPI bus alongside the radio SoC, the flash also serves as a low-overhead log store between network transactions. Its 256-byte page program granularity aligns with 256-byte sensor frames, letting a single page-write commit a complete IoT telemetry packet atomically. Designers should reserve a 4 KB sector for the factory calibration block and a separate 64 KB block for OTA staging, leveraging the AT25DF641A's uniform 4 KB sector erase to update either block without disturbing the rest of the firmware image.
تجویز کردہ
Smart-Home Hub Boot and Config Storage
Smart-home hubs (Zigbee/Wi-Fi gateways) commonly use the AT25DF641A-SH-T as both a boot source and a config/asset store. The 64 Mbit density comfortably holds the gateway firmware plus pairing tables, network keys, and a small on-device web UI; the SOIC-8 208 mil package drops directly onto the hub mainboard without any footprint rework versus competitor parts. The hardware /WP pin lets the factory lock the boot sector against accidental reprogramming while leaving the config sectors writable. Designers should wire /HOLD to the host GPIO so an in-field firmware update can pause SPI transactions during a power glitch. With 100 MHz Single-I/O SPI throughput of roughly 12.5 MB/s and Dual-I/O doubling that, the gateway can refresh its UI assets from flash in well under a second.
تجویز کردہ
Consumer Electronics Config / Asset Logging
The AT25DF641A-SH-T serves consumer electronics as a config-and-asset-logging flash where a removable SD card is undesirable for cost or vibration reasons. The 8 MB capacity easily absorbs UI graphics, language tables, and a rolling usage-log buffer for warranty analysis, while the SPI interface keeps the host MCU pin count low (only 4 wires: SCK, SI, SO, /CS). With 4 KB sector erase granularity, the host can rewrite the language table sector-by-sector as users change settings, never touching the read-only assets. Industrial temperature (-40 to +85 C) operation makes the AT25DF641A-SH-T suitable for white goods, set-top boxes, and printer control panels where thermal cycling is routine. The /WP pin provides hardware protection for the boot image while leaving user-configurable sectors open.
تجویز کردہ
Industrial HMI Code Storage
Industrial human-machine interface (HMI) panels typically pair the AT25DF641A-SH-T with a Cortex-M7 or Cortex-A5 host to hold both the LVGL/Embedded Wizard graphics library and the runtime configuration. The 64 Mbit (8 MB) capacity is enough for multi-language industrial screens plus alarm-history buffers, and the SPI/Quad-SPI Dual-I/O mode (2x bandwidth) keeps screen-refresh latency low even on a slow AHB bus. Industrial-grade temperature (-40 to +85 C) is mandatory for control cabinets, and the SOIC-8 208 mil package withstands hand-soldering rework typical in field-service HMIs. Designers should reserve the first 4 KB sector as a CRC-protected bootloader, the next 64 KB as the primary application image, and the remainder as OTA staging and alarm log. The hardware /WP pin protects the bootloader during OTA updates.
تجویز کردہ
Wi-Fi / BLE Module Co-Storage
Wi-Fi and Bluetooth Low Energy modules (e.g. ESP32-based or nRF52840-based designs) frequently include a companion SPI flash on the module carrier PCB, and the AT25DF641A-SH-T is a strong fit for the 8 MB variant. It stores TLS certificates, provisioning data, OTA staging images, and module firmware when the host radio SoC's internal flash is full. With 100 MHz SPI clock and Dual-I/O read, TLS certificate retrieval adds negligible latency to TLS handshakes. The /HOLD pin lets the radio SoC pause SPI transactions during critical BLE radio events without aborting the bus. SOIC-8 208 mil packaging is standard across module designs, so the part drops in without PCB changes versus W25Q64 or MX25L6406 modules.
تجویز کردہ
Automotive Infotainment Boot (AEC-Q100 context)
While the AT25DF641A-SH-T itself is not AEC-Q100 qualified, the SOIC-8 208 mil footprint is shared by AEC-Q100 automotive SPI flash variants, and the same firmware-driver code can be reused across consumer and automotive infotainment SKUs. The 64 Mbit density holds an Android/Linux boot image plus a redundant A/B partition for fail-safe OTA updates. Designers targeting automotive should select the AEC-Q100 sister part (typically a Renesas AT25QF automotive-grade equivalent) in the same SOIC-8 208 mil package. Industrial temperature (-40 to +85 C) of the AT25DF641A-SH-T is acceptable for cabin-area (non-ECU) automotive applications such as head-unit graphics storage. For under-hood or ECU applications, use the AEC-Q100 qualified equivalent instead.
تجویز کردہ
Test & Measurement Data Logging
Portable test and measurement instruments (handheld oscilloscopes, power-quality analyzers, and bench multimeters with logging) use the AT25DF641A-SH-T as a high-density local store for waveform captures and event logs. With 8 MB of capacity, the instrument can record several minutes of 8-bit ADC samples at 100 kS/s, or thousands of fault events with timestamps. The 256-byte page program granularity matches common sample-block sizes, and the hardware /WP pin can be wired to a "locked" mode for forensic logging where the data must be tamper-evident. Industrial temperature operation ensures reliable field use, and the SOIC-8 208 mil footprint accommodates conformal coating in outdoor deployments. Deep Power-Down (under 5 µA typical) keeps battery idle drain low between captures.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا AT25DF641A-SH-T — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | AT25QF641B-SHB-T | AT25DF641A-SH-B | AT25DF081A-SH-B | W25Q64JVSSIQ | MX25L6406EZNI-10G | SST26VF064B-104I/SM |
|---|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Winbond | Macronix | Microchip Technology |
| Package | 8-SOIC (SOIC-W 208 mil, "SH") | 8-SOIC (SOIC-W 208 mil, "SH") - same | 8-SOIC (SOIC-W 208 mil, "SH") - same | 8-SOIC (SOIC-W 208 mil, "SH") - same | 8-SOIC (SOIC-W 208 mil) - same footprint | 8-SOIC (SOIC-W 208 mil) - same footprint | 8-SOIC (SOIC-W 208 mil, "SM") - same footprint |
| Density | 64 Mbit (8 MB) | 64 Mbit (8 MB) | 64 Mbit (8 MB) | 8 Mbit (1 MB) - lower density | 64 Mbit (8 MB) | 64 Mbit (8 MB) | 64 Mbit (8 MB) |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V |
| Max SPI Clock | 100 MHz (Single-I/O) | 100 MHz+ (Single-I/O) | 100 MHz (Single-I/O) | 100 MHz (Single-I/O) | 133 MHz (Single-I/O) | 104 MHz (Single-I/O) | 104 MHz (Single-I/O) |
| Quad-SPI Support | No (Dual-I/O only) | Yes | No (Dual-I/O only) | No (Dual-I/O only) | Yes | Yes | Yes |
| Sector Erase (smallest) | 4 KB uniform | 4 KB uniform | 4 KB uniform | 4 KB uniform | 4 KB uniform | 4 KB uniform | 4 KB uniform |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Lifecycle Status | NRND | Active (recommended successor) | NRND | NRND | Active | Active | Active |
| Approx. Unit Price (qty 1k) | $0.82 | Similar (successor at parity) | Similar (tube vs reel) | Lower (smaller density) | $0.55-0.70 | $0.55-0.70 | $0.80-1.00 |
اہم امتیازی خصوصیات
- Identical footprint to the recommended Quad-SPI successor AT25QF641B-SHB-T (بمقابلہAT25QF641B-SHB-T)
- Cross-brand pin-compatible with Winbond W25Q64JVSSIQ at lower unit cost (بمقابلہW25Q64JVSSIQ)
- Higher density and same package as the lower-cost AT25DF081A-SH-B (بمقابلہAT25DF081A-SH-B)
- Industry-standard SOIC-8 208 mil pinout enables direct swap with MX25L6406E (بمقابلہMX25L6406EZNI-10G)
ڈیزائن نوٹس
Place a 0.1 µF X7R ceramic decoupling capacitor within 5 mm of the VCC pin (pin 8) on the AT25DF641A-SH-T, with a wide (>=0.2 mm) trace to GND. SOIC-8 has only one VCC pin so the decoupling is single-point; do not daisy-chain VCC to other devices. Keep SCK trace length under 50 mm and avoid running SCK parallel to noisy switching traces (e.g. boost-converter SW nodes) for more than 10 mm. Series-termination is not normally needed at 100 MHz on short traces, but if your layout forces longer SCK, add a 33 Ω resistor at the host end.
Do not issue the first SPI command to the AT25DF641A-SH-T until at least tVSL (typically 30 ms) after VCC has stabilized in the 2.7-3.6 V range. Premature commands may not be acknowledged and can leave the device in an undefined state. Do not toggle /WP or /HOLD while SCK is high; both control signals must change only when SCK is low, or framing errors will occur. When writing status register bits, ensure the SRWD bit is set if you want hardware /WP to lock the status register; otherwise /WP only protects the array and not the status register.
To minimize battery drain in IoT designs, issue the Deep Power-Down command (0xB9h) before putting the host MCU to sleep. The AT25DF641A-SH-T then drops ICC below 5 µA typical. To wake up, the host must toggle /CS high-low-high (release from DPD, 0xABh) and wait tRES1 (typically 30 µs) before issuing the next read/write. Avoid holding /CS low for extended periods while the radio SoC is doing critical BLE events; instead, deassert /CS between transactions so the flash returns to standby. Bulk erase (0xC7/0x60) takes 40-80 s and draws elevated ICC; do not initiate it from a battery whose capacity margin is below 25%.
The SOIC-8 208 mil ("SH") land pattern is industry standard; pin 1 marker is a small dot on the package and the pin numbering follows the standard counter-clockwise convention viewed from above (pin 1 top-left, pin 4 GND opposite, pin 8 VCC opposite pin 1). Match the land pattern to JEDEC MS-013 or the manufacturer's SOIC-W 208 mil mechanical drawing. Hand-soldering is feasible with a fine tip; for reflow, follow JEDEC J-STD-020 MSL-3 floor-life rules (168 hours before bake-out at 125 C).
تعمیل کی معلومات
RoHS compliant and lead-free per Renesas/Adesto datasheet and product page. Not AEC-Q100 qualified - for automotive applications select an AEC-Q100 qualified equivalent in the same SOIC-8 208 mil footprint. Lifecycle status is NRND (Not Recommended for New Designs) per Renesas product page - new designs should target AT25QF641B-SHB-T.
