AT25DF641A-SH-B - 64Mbit SPI Flash, 2.7-3.6V, 100MHz SOIC-8 | Renesas
부품 번호: AT25DF641A-SH-B ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.18 | $21.80 |
| 100 | $1.92 | $192.00 |
| 500 | $1.71 | $855.00 |
| 1,000 | $1.55 | $1,550.00 |
AT25DF641A-SH-B 개요
A serial NOR Flash is a non-volatile memory that connects to a host microcontroller via a low-pin-count serial peripheral interface (SPI). Within the memory hierarchy, a NOR Flash sits above external SRAM/DRAM and below the MCU's internal flash: program code is shadowed from the array into embedded or external RAM for execution, while data logging and configuration records persist across power cycles. Serial NOR Flash (Flash -> NOR Flash -> non-volatile memory -> semiconductor) is preferred over parallel NOR for cost- and pin-constrained designs because it requires only 4 to 6 signal lines instead of 16 to 32.
Key features include 64-Mbit density organized as 8 MB, 256-byte page programming granularity, 4-KB sector and 32-KB and 64-KB block erase options, hardware/software/absolute write protection, and a 100 MHz maximum SPI clock with Single and Dual I/O read modes. The device operates across -40 C to +85 C and is qualified for high-volume consumer and industrial applications requiring reliable code shadowing and data logging.
Architecturally, the AT25DF641A implements the standard Adesto/Atmel 25-series command set (0x9F JEDEC ID, 0x03 read, 0x0B fast read, 0x3B dual-output read, 0x02 page program, 0x20/0x52/0xD8 sector/block erase), which enables drop-in compatibility with Macronix MX25L6406E, Winbond W25Q64, and similar 64-Mbit SPI NOR parts. The 256-byte page Erase feature supports efficient, low-energy data logging by allowing small chunks to be rewritten without erasing a full 4 KB sector first.
Typical applications include set-top box boot ROM, IoT edge node firmware storage, smart-home hub configuration and OTA staging, industrial sensor data loggers, automotive infotainment non-volatile storage, and consumer electronics such as printers and home appliances that need reliable code shadowing into host RAM.
Designers should note that the -SH-B suffix denotes 8-SOIC (Wide Body, 208 mil) in tube packaging; the -SH-T variant uses tape-and-reel for high-volume SMT assembly. Designers must observe VCC ramp timing, hold the CS# pin low only during active transfers, and add a 100 nF decoupling capacitor adjacent to the VCC pin for stable read/program/erase operation.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not found in the standalone manufacturer datasheet, with full v3.9 STRICT DROP-IN-ONLY alternatives ranked same-brand first then cross-brand.
드롭인 대체품: AT25DF641A-SH-B — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AT25DF641A-SH-B (동일 폼 팩터 및 풋프린트) — 차이점: Package, Memory Type, Operating Temperature, Supply Voltage (VCC), Interface.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AT25DF641A-SH-T
✅ 드롭인✓ 재고 있음
$0.82 / 개
데이터시트 보기 →AT25DF321A-SH-B
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AT25DF641A-MHB-T
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MX25L6406EM2I-12G
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
W25Q64JVSSIQ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
S25FL064P0XNFI001
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
GD25Q64ESIGR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AT25DF641A-SH-B 최대 정격 & 전기적 특성
| 메모리 유형 | Non-volatile NOR Flash |
| Memory Density | 64 Mbit (8 MB) |
| 메모리 구성 | 8M x 8 bit |
| 인터페이스 | SPI (Serial Peripheral Interface) |
| SPI Modes | Mode 0 and Mode 3 |
| Maximum SPI Clock | 100 MHz |
| Dual-I/O Support | Yes (Dual Output Read) |
| Supply Voltage (VCC) | 2.7 V to 3.6 V (single supply) |
| Page Size | 256 bytes |
| Sector Erase Size | 4 KB |
| Block Erase Sizes | 32 KB and 64 KB |
| 동작 온도 | -40 C to +85 C |
| 패키지 | 8-SOIC-W (Wide Body, 208 mil) |
| 실장 유형 | Surface Mount |
| Packaging Form | Tube (-SH-B suffix) |
| Lead-Free / RoHS | Yes (Green, Pb-free) |
| Write Protection | Hardware WP#, software, and absolute protection |
| JEDEC ID | 0x1F (Atmel/Renesas) |
AT25DF641A-SH-B 핀 구성
| 핀 1 | CS# — Chip Select (active low) |
| 핀 2 | SO / SIO1 — Serial Data Out / Dual IO 1 |
| 핀 3 | WP# / SIO2 — Write Protect (active low) / Dual IO 2 |
| 핀 4 | GND — Ground |
| 핀 5 | SI / SIO0 — Serial Data In / Dual IO 0 |
| 핀 6 | SCK — Serial Clock |
| 핀 7 | HOLD# / SIO3 — Hold (active low) / Dual IO 3 |
| 핀 8 | VCC — Power supply (2.7V to 3.6V) |
일반적인 애플리케이션
AT25DF641A-SH-B 적합 용도: 6 애플리케이션s: IoT Edge Node Firmware Storage, Set-Top Box Boot and Code Shadow, Industrial Sensor Data Logger, Smart Home Hub Configuration and OTA Staging, Automotive Infotainment Non-Volatile Storage, Consumer Printer and Home Appliance Firmware.
IoT Edge Node Firmware Storage
The AT25DF641A-SH-B stores 8 MB of firmware and OTA staging for IoT edge nodes such as ESP32 gateways and Cortex-M4 sensor hubs. Its 100 MHz SPI clock with Dual-I/O read streams up to 200 Mb/s, eliminating wait states during XIP boot. The 2.7-3.6V supply aligns directly with 3.3V MCU rails, removing level-shifters. The 256-byte page Erase feature supports efficient, low-energy firmware delta updates: only the changed page need be rewritten, keeping OTA power budgets below 50 mJ per 64 KB block. Standard Atmel 25-series commands (0x9F, 0x03, 0x0B, 0x02, 0x20) mean generic SPI flash driver code from ESP-IDF, STM32 HAL, and Zephyr ports unchanged.
추천
Set-Top Box Boot and Code Shadow
Set-top boxes and streaming devices boot from a parallel NOR Flash into DRAM, but increasingly use a serial NOR like the AT25DF641A-SH-B as the primary boot ROM to save PCB area. The 8-SOIC-W (208 mil) package fits in tight enclosures while delivering 64 Mbit density, enough for bootloader, kernel, and configuration partitions. Its 100 MHz max clock supports DDR-mode-like fast read at 200 Mb/s, sufficient for cold-boot times under 2 seconds. Hardware WP# enables factory-mode lockout, and software sector protection prevents accidental overwrite of bootloader sectors during OTA upgrades. The Atmel 25-series command set is widely supported by set-top SoC BSPs.
추천
Industrial Sensor Data Logger
Industrial data loggers in factories and remote telemetry units need non-volatile storage that survives -40 C to +85 C and supports frequent small writes. The AT25DF641A-SH-B operates over the full industrial temperature range and offers 256-byte page programming with hardware WP# and software sector protection, enabling reliable ring-buffer logging without host-side wear-leveling overhead. The 4 KB sector erase granularity is small enough to allow 1-second sample logging for hours before requiring garbage collection. Its 2.7V minimum VCC also tolerates battery droop during cold-start, making it a strong fit for solar-powered remote sensors.
추천
Smart Home Hub Configuration and OTA Staging
Smart home hubs (Zigbee/Z-Wave/Matter bridges) need reliable non-volatile storage for configuration, pairing tables, and OTA staging. The AT25DF641A-SH-B provides 8 MB - enough to hold two full firmware images for A/B OTA updates plus persistent configuration blocks. Its Dual-I/O read mode shortens boot time, getting the hub online within 3 seconds of power-on. The hardware WP# pin can be tied to a supervisor IC to prevent inadvertent writes during brownout. Tube-packaged -SH-B simplifies hand-build prototyping, while -SH-T supports high-volume SMT on the same PCB.
추천
Automotive Infotainment Non-Volatile Storage
Although not AEC-Q100 qualified, the AT25DF641A-SH-B is widely used in non-safety automotive subsystems such as head-unit infotainment, rear-seat entertainment, and telematics control units. The 64-Mbit density stores navigation map tiles, voice prompts, and multimedia metadata. Its 100 MHz SPI and Dual-I/O read deliver smooth audio streaming from flash without buffering in DRAM. The hardware WP# combined with software sector protection allows bootloaders to lock critical map regions while leaving user area writable. Designers should pair the part with a watchdog supervisor and place it away from high-EMI zones.
추천
Consumer Printer and Home Appliance Firmware
Printers, washing machines, microwaves, and air conditioners use a 64-Mbit serial NOR like the AT25DF641A-SH-B to store firmware plus font tables, UI strings, and diagnostic logs. The 8-SOIC-W (208 mil) package is hand-solderable for service repairs and survives the high-temperature reflow profiles of consumer appliance PCBs. The Atmel 25-series SPI command set is supported by nearly all low-cost appliance MCUs (PIC, ATmega, STM8). The 256-byte page erase enables small EEPROM-like updates for model-variant configuration without erasing the entire 4 KB sector.
추천
추천 제품 요약
엔지니어링 참조 데이터: AT25DF641A-SH-B — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AT25DF641A-SH-T | MX25L6406EM2I-12G | W25Q64JVSSIQ | S25FL064P0XNFI001 |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Macronix | Winbond | Infineon |
| Package | 8-SOIC-W (208 mil) | 8-SOIC-W (208 mil) - same | 8-SOIC (150 mil) - same footprint | 8-SOIC (208 mil) - same | 8-SOIC (208 mil) - same |
| Density | 64 Mbit (8 MB) | 64 Mbit | 64 Mbit | 64 Mbit | 64 Mbit |
| Maximum SPI Clock | 100 MHz | 100 MHz | 86 MHz (-14%) | 133 MHz (+33%) | 80 MHz (-20%) |
| Multi-I/O Support | Dual I/O | Dual I/O | Dual I/O | Quad SPI | Dual I/O |
| 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 |
| Operating Temperature | -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 |
| Packaging Form | Tube | Tape and Reel | Tape and Reel | Tape and Reel | Tape and Reel |
주요 차별점
- Wide-body 208 mil SOIC simplifies hand-soldering and inspection (vs MX25L6406EM2I-12G)
- 100 MHz SPI clock with Dual-I/O read delivers 200 Mb/s effective bandwidth (vs S25FL064P0XNFI001)
- Standard Atmel 25-series command set with widest third-party driver support (vs W25Q64JVSSIQ)
설계 노트
Place a 100 nF ceramic decoupling capacitor within 5 mm of the VCC pin (pin 8) and a 10 uF bulk capacitor on the same 3.3V rail. During active read at 100 MHz the part can draw up to 25 mA peak; an undersized local cap will cause VCC droop and read errors. Add a 10 kohm pull-up on CS# to keep the part in standby (<15 uA ICC) whenever the host MCU's SPI peripheral is not actively driving the bus.
Route SCK, CS#, SI, and SO as a matched-length bus within 25 mm of the MCU's SPI pins. Keep the SPI traces away from switching power lines and high-frequency clock nets by at least 3W (where W is the trace width). The exposed copper pad on the bottom of the SOIC-W can be left floating or soldered to GND for improved thermal dissipation; in most designs floating is acceptable since the part dissipates under 50 mW during active read.
Do not enable Quad SPI commands (0xEB, 0xE7) on the AT25DF641A-SH-B - this part supports only Single and Dual I/O. Sending Quad commands returns 0xFF or corrupt data. Also note that the WP# and HOLD# pins must be tied high (inactive) via 10 kohm pull-ups if software protection is enabled, otherwise the part will refuse program/erase commands. Always issue 0x06 WREN before 0x02 page program or 0x20 sector erase.
At 100 MHz SCK the SO output rise/fall time is around 2 ns, producing edge rates that couple easily into adjacent traces. Place a 33 ohm series damping resistor near the MCU end of the SO line if the trace length exceeds 50 mm. For designs that switch between 3.3V MCU logic and 1.8V peripherals, add a level translator on CS#, SCK, SI, SO rather than relying on the flash's 5V-tolerant inputs (this part is NOT 5V tolerant).
규정 준수 정보
RoHS and lead-free per Renesas product page. Halogen-free per Green package marking. Not AEC-Q100 qualified - use AT25DF641A-Q1 variants for automotive safety applications.
