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Renesas AT25PE40-SHN-B
- Part No.:
- AT25PE40-SHN-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25PE40-SHN-B.pdf
- Description:
- IC FLASH 4MBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,747
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Product details
Overview
AT25PE40-SHN-B from Microchip Technology is a 4-Mbit serial Flash memory with DataFlash-L architecture, designed for sequential-access data storage in embedded systems. It operates from 1.65V–3.6V, supports SPI modes 0/3 up to 85 MHz, features dual 256/264-byte SRAM buffers for concurrent read/write, and delivers 6 ns clock-to-output timing. It is used in firmware logging, voice recording, and program code storage where low pin count and high-speed continuous read are critical.
For engineers reviewing the AT25PE40-SHN-B datasheet, AT25PE40-SHN-B pinout, AT25PE40-SHN-B application, or AT25PE40-SHN-B equivalent, this page provides verified pin functions, real-world use cases in industrial firmware update systems, confirmed buffer interleaving behavior, and validated alternatives for SPI Flash migration paths.
Technical Context
The AT25PE40-SHN-B implements a serial interface with no parallel address bus, relying on 3-wire SPI (CS/SI/SO/SCK) and internal address counters for sequential access. Its architecture includes two independent SRAM buffers enabling simultaneous data reception while reprogramming main memory - a key enabler for uninterrupted streaming writes.
It supports four distinct Continuous Array Read opcodes (01h, 03h, 0Bh, 1Bh) with differentiated max clock frequencies (fCAR3 to fCAR4), plus Main Memory Page Read (D2h) and Buffer Read (D1h/D3h/D4h/D6h). All erase and program operations are self-timed, with hardware write protection via WP pin and reset control via dedicated RESET input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4,194,304 bits (512 KB), organized as 2,048 pages of 256 or 264 bytes |
| Supply voltage | 1.65V–3.6V single supply - enables direct interfacing with 1.8V/2.5V/3.3V logic without level shifters |
| Max clock frequency | 85 MHz (RapidS mode) - supports high-throughput streaming reads without CPU polling overhead |
| Read latency | 6 ns tV (clock-to-output) - minimizes wait states during burst reads in real-time audio/video buffering |
| Power consumption | 300 nA ultra-deep power-down current - suitable for battery-backed firmware storage with multi-year shelf life |
| Erase granularity | Page (256/264 B), Block (2 KB), Sector (64 KB), Chip (4 Mbit) - enables fine-grained wear leveling and partial firmware updates |
| Endurance & retention | 100,000 program/erase cycles per page; 20-year data retention - meets industrial firmware logging requirements |
Pinout & Package
AT25PE40-SHN-B is packaged in an 8-lead SOIC (0.208" wide), with pinout identical to standard SPI serial Flash devices. The package is RoHS-compliant, halide-free, and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must transition low-to-high to terminate all operations including self-timed erases |
| SO | Serial Output | Output-only data line; tri-stated when CS is high - allows shared bus with other SPI peripherals |
| WP | Write Protect | Hardware lock: asserts low to block all program/erase commands regardless of software protection state |
| GND | Ground reference | System ground connection; required for stable operation and ESD immunity |
| VCC | Power supply | 1.65V–3.6V input; powers all internal logic, Flash array, and SRAM buffers |
| RESET | Reset input | Active-low asynchronous reset; terminates ongoing operations and returns state machine to idle |
| SCK | Serial Clock | Master-generated clock; rising edge latches SI, falling edge clocks SO - defines timing for all transfers |
| SI | Serial Input | Command/address/data input; ignored when CS is deasserted - prevents spurious command injection |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (256/264 B each) | Enables true concurrent write-to-buffer + read-from-main-memory, eliminating write stalls in streaming applications |
| RapidS™ high-speed interface | Supports 85 MHz SCK for continuous reads - doubles throughput vs. legacy SPI Flash at same voltage |
| User-configurable page size | Factory-default 256 B or customer-selectable 264 B - optimizes alignment for ECC or metadata overhead in firmware images |
| Four Continuous Array Read modes | 01h (low-power), 03h (standard), 0Bh/1Bh (high-frequency) - lets designers trade clock speed vs. power vs. timing margin |
| 128-byte factory-unique ID register | Provides immutable device fingerprint for secure boot verification and field firmware binding |
Applications
| Firmware Update Storage | Voice/Data Logging |
|---|---|
|
Use Scenario: Storing compressed firmware images for over-the-air (OTA) updates in industrial gateways. IC Role / Device Role / Timing Role: Non-volatile sequential storage with fast page read and sector erase - enables atomic image swap without external RAM buffering. Use Value: 64 KB sector erase allows full firmware replacement in <100 ms; dual buffers permit background download while active firmware runs. |
Use Scenario: Continuous audio capture in environmental monitoring sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power sequential recorder using 01h opcode read and ultra-deep power-down between samples. Use Value: 300 nA deep-sleep current extends battery life to >5 years; 256-byte pages align with 16-bit PCM sample blocks. |
| Embedded Boot Code Storage | Graphics Asset Caching |
|
Use Scenario: Holding bootloader and configuration tables in medical imaging controllers requiring AEC-Q200 reliability. IC Role / Device Role / Timing Role: SPI-boot source with JEDEC ID verification and hardware WP - ensures boot integrity against accidental corruption. Use Value: Factory-programmed 128-byte unique ID binds bootloader to specific unit; 20-year retention guarantees field longevity. |
Use Scenario: Caching UI bitmaps and font glyphs in portable HMI displays with limited DRAM. IC Role / Device Role / Timing Role: High-bandwidth sequential read engine using 1Bh RapidS mode - feeds display controller at 85 MHz without FIFO underflow. Use Value: 6 ns tV and continuous-read wraparound eliminate inter-frame gaps; 2 KB block erase refreshes assets without full reload. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25SF041-SSHD-B | Same 4-Mbit density, but uses standard SPI (no RapidS), max 80 MHz, no dual buffers, 1.7–2.0V VCC min | Lacks concurrent buffer operation and 85 MHz read - unsuitable for real-time streaming, but lower cost for static firmware storage | Select when RapidS and buffer interleaving are unnecessary and 1.65V operation is not required. |
| W25Q40EWSSIG | 4-Mbit Quad SPI (QSPI) Flash, 133 MHz, 4-line I/O, no SRAM buffers, 1.7–2.0V VCC min | Higher bandwidth via quad mode but requires 4 I/O lines and lacks sequential-access optimization - better for random-access code XIP | Select when system supports QSPI and prioritizes peak bandwidth over low-pin-count simplicity and streaming efficiency. |
Compared with AT25PE40-SHN-B, AT25SF041-SSHD-B offers simpler SPI compatibility at lower speed and voltage range, while W25Q40EWSSIG trades pin efficiency and sequential optimization for higher raw bandwidth via quad I/O - making AT25PE40-SHN-B uniquely suited for streaming-critical, space-constrained 3-wire SPI designs.
Availability
AT25PE40-SHN-B is available at Aetrix Electronics and suitable for industrial firmware update systems, battery-powered voice loggers, medical boot loaders, and portable HMI graphics caches requiring stable component supply across extended product lifecycles.
Supply support for AT25PE40-SHN-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and non-volatile memory solutions, with emphasis on industrial, automotive, and aerospace reliability.
The AT25PE40-SHN-B belongs to Microchip's DataFlash-L family - engineered specifically for sequential-access Flash applications demanding high-speed streaming, low-voltage operation, and integrated SRAM buffering to eliminate write bottlenecks.
FAQ
What is the default page size configuration for AT25PE40-SHN-B?
The AT25PE40-SHN-B ships with a default page size of 256 bytes. This is factory-set and does not require configuration. The 264-byte option is available only as a customer-specific order variant - it is not user-selectable in-circuit or via command. AT25PE40-SHN-B operates exclusively in the 256-byte mode unless explicitly ordered as the 264-byte version (e.g., AT25PE40-SHN-B-264).
Does AT25PE40-SHN-B support Quad SPI (QSPI) or only standard SPI?
AT25PE40-SHN-B supports only standard 3-wire SPI (CS/SI/SO/SCK) and RapidS™ extensions - it does not implement Quad SPI (QSPI) or any 4-line I/O mode. Its interface is strictly single-data-line input/output, optimized for sequential access rather than random-address bandwidth. AT25PE40-SHN-B uses no IO2 or IO3 pins and has no QSPI command set.
Can AT25PE40-SHN-B be used as a direct replacement for AT25DF041A?
No, AT25PE40-SHN-B is not a direct replacement for AT25DF041A. While both are 4-Mbit SPI Flash devices, AT25PE40-SHN-B uses a different command set (e.g., 1Bh for high-speed read), lacks the AT25DF041A's "deep power-down resume" feature, and has distinct status register bit definitions. Firmware must be updated to match AT25PE40-SHN-B's RapidS opcodes and buffer-handling protocol.
How does the dual-buffer architecture of AT25PE40-SHN-B improve write performance?
The AT25PE40-SHN-B's two independent 256-byte SRAM buffers allow one buffer to accept incoming data via SI while the other buffer simultaneously programs into main memory - enabling uninterrupted data flow. This eliminates the traditional "write stall" during Flash programming, reducing effective write latency by up to 70% in continuous logging applications. AT25PE40-SHN-B leverages this for real-time audio/video buffering without external RAM.
Is the RESET pin on AT25PE40-SHN-B mandatory for normal operation?
No, the RESET pin on AT25PE40-SHN-B is optional. The device incorporates an internal power-on reset circuit, so asserting RESET externally is not required for startup. If unused, the RESET pin must be externally pulled high (not left floating) per datasheet recommendation. AT25PE40-SHN-B functions fully in standard SPI mode without RESET connectivity, though it loses the ability to abort ongoing erase/program cycles mid-execution.
AT25PE40-SHN-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- -
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR (SLC)
- Memory Size:
- 4Mbit
- Memory Organization:
- 2M x 2
- Memory Interface:
- SPI
- Clock Frequency:
- 85 MHz
- Write Cycle Time - Word, Page:
- 3ms
- Access Time:
- 6 ns
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25PE40-SHN-B FAQ
1.How can I place an order for AT25PE40-SHN-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25PE40-SHN-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 AT25PE40-SHN-B reliable?
The price and inventory of AT25PE40-SHN-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25PE40-SHN-B is usually 5 days.
3.What payment methods are accepted for AT25PE40-SHN-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25PE40-SHN-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25PE40-SHN-B?
AT25PE40-SHN-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25PE40-SHN-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 AT25PE40-SHN-B?
For technical support, including AT25PE40-SHN-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25PE40-SHN-B requirements.
6.How does Aetrix verify that AT25PE40-SHN-B is sourced from the original manufacturer or authorized distributors?
All AT25PE40-SHN-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 AT25PE40-SHN-B meets industry standards.
7.What is the process for return or replacement of AT25PE40-SHN-B?
All AT25PE40-SHN-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25PE40-SHN-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 AT25PE40-SHN-B part is unused and in its original packaging.
Return procedure for AT25PE40-SHN-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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