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Renesas AT25PE40-SSHN-B
- Part No.:
- AT25PE40-SSHN-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25PE40-SSHN-B.pdf
- Description:
- IC FLASH 4MBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,487
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Product details
Overview
AT25PE40-SSHN-B from Microchip Technology is a 4-Mbit serial Flash memory with SPI interface, RapidS™ high-speed operation up to 85 MHz, dual 256/264-byte SRAM buffers, and page/block/sector/chip erase granularity. It operates from 1.65V–3.6V and supports continuous read across page boundaries - ideal for firmware storage and real-time data logging in embedded controllers.
For engineers reviewing the AT25PE40-SSHN-B datasheet, AT25PE40-SSHN-B pinout, AT25PE40-SSHN-B application, or AT25PE40-SSHN-B equivalent, key selection criteria include its 6 ns clock-to-output time, 300 nA ultra-deep power-down current, user-configurable 256/264-byte page size, and hardware write protection via WP pin - all critical for low-power, high-reliability industrial firmware updates.
Technical Context
The AT25PE40-SSHN-B implements a serial sequential-access architecture with two independent SRAM buffers enabling concurrent receive-and-program operations. Its RapidS™ interface supports SPI modes 0 and 3 with up to 85 MHz SCK frequency and 6 ns tV timing, while internal address counters enable seamless wraparound reads across page and array boundaries.
It features self-timed erase/program cycles, JEDEC-standard manufacturer/device ID read capability, and a 128-byte factory-programmed security register containing a unique identifier. Erase flexibility includes page (256/264 B), block (2 KB), sector (64 KB), and chip (4 Mbit) levels - all executed without external high-voltage supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 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 firmware streaming in real-time systems |
| Read latency | 6 ns clock-to-output (tV) - minimizes wait states during instruction fetch or configuration loading |
| Power consumption | 300 nA ultra-deep power-down (typical) - extends battery life in always-on sensor nodes |
| Erase endurance | 100,000 program/erase cycles per page - ensures long-term reliability in field-upgradable devices |
| Data retention | 20 years at 85°C - validated for automotive and industrial temperature-critical deployments |
| Operating temperature | −40°C to +85°C - fully specified across full industrial range without derating |
Pinout & Package
AT25PE40-SSHN-B uses an 8-lead SOIC package (0.208" wide), RoHS-compliant and halide-free. Pin functions are electrically defined and validated per DS-25PE40-142D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on high-to-low transition and terminates on low-to-high |
| SCK | Serial Clock | Controls data flow; SI latched on rising edge, SO driven on falling edge - defines SPI timing compliance |
| SI | Serial Input | Accepts opcodes, addresses, and input data; ignored when CS is deasserted |
| SO | Serial Output | Drives read data; tri-stated when CS is high - enables multi-device SPI bus sharing |
| WP | Write Protect | Hardware lock for sector protection; overrides software protection when asserted low |
| RESET | Reset | Active-low abort signal; resets internal state machine without power cycle - critical for fault recovery |
| VCC | Power Supply | 1.65V–3.6V input; powers all logic and memory arrays - no auxiliary voltage rails required |
| GND | Ground | Reference for VCC and all I/O - must be low-impedance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (256/264 B each) | Enables interleaved buffering: receive new data into one buffer while programming the other into Flash - eliminates write stalls in continuous logging |
| User-configurable page size | Factory-default 256 B or customer-selectable 264 B - optimizes alignment for ECC or metadata overhead in firmware partitioning |
| RapidS™ high-speed read | Up to 85 MHz SCK with 6 ns tV - delivers >80 MB/s effective throughput for boot image streaming |
| Flexible erase hierarchy | Page (256/264 B), block (2 KB), sector (64 KB), chip (4 Mbit) - allows precise wear leveling and partial firmware updates |
| Ultra-low deep power-down | 300 nA typical current - reduces quiescent power by >99% vs active mode, enabling years of operation on coin cells |
| 128-byte factory-unique ID | Immutable serial number stored in security register - supports device authentication and secure provisioning in IoT edge nodes |
Applications
| Firmware Storage | Real-Time Data Logging |
|---|---|
|
Use Scenario: Storing bootloader, application firmware, and configuration tables in microcontroller-based industrial controllers. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast random-access-equivalent read via continuous array read and page-aligned updates. Use Value: 85 MHz RapidS™ read speed and 6 ns tV reduce boot time; dual buffers allow background firmware validation before activation. |
Use Scenario: Capturing sensor timestamps, error logs, and operational metrics in battery-powered environmental monitors. IC Role / Device Role / Timing Role: High-endurance sequential write buffer with page-erase granularity to extend flash lifetime under frequent writes. Use Value: 100,000 erase cycles per page and 300 nA deep power-down enable multi-year deployment without maintenance. |
| Secure Device Identity | Configurable System Scratchpad |
|
Use Scenario: Binding cryptographic keys and device certificates to hardware identity in medical telemetry endpoints. IC Role / Device Role / Timing Role: Tamper-resistant identity source using factory-programmed 128-byte unique ID register. Use Value: Immutable serial number enables PKI enrollment and prevents cloning - verified at manufacturing and runtime. |
Use Scenario: Providing temporary working memory for parameter interpolation and calibration coefficient storage in motor drives. IC Role / Device Role / Timing Role: Dual SRAM buffers act as volatile scratchpad memory accessible via SPI, independent of main Flash array. Use Value: Eliminates need for external RAM; 264-byte buffer option accommodates ECC bytes for safety-critical data integrity. |
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-SSHN-B | 4-Mbit SPI Flash with Quad I/O support, 104 MHz max clock, no dual SRAM buffers | Lacks interleaved buffering and RapidS™ continuous read; optimized for QSPI boot, not streaming log capture | Choose for higher bandwidth QSPI interfaces where buffer concurrency is unnecessary |
| W25Q40EWSSIG | 4-Mbit WSON-8 package, 104 MHz, 3-byte address only, no hardware RESET or WP pins | No dedicated RESET/WE pins; requires software reset sequence and lacks hardware write lock | Prefer when board space is constrained and hardware reset/write protection are managed externally |
Compared with AT25PE40-SSHN-B, AT25SF041-SSHN-B offers faster quad-read throughput but sacrifices buffer-assisted streaming and hardware reset; W25Q40EWSSIG saves footprint but removes critical hardware safety controls - making AT25PE40-SSHN-B uniquely suited for robust, low-power, real-time firmware and logging systems.
Availability
AT25PE40-SSHN-B is available at Aetrix Electronics and suitable for industrial control firmware storage, battery-powered data loggers, secure device identity provisioning, and embedded system configuration management requiring stable component supply and long-term lifecycle support.
Supply support for AT25PE40-SSHN-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 company specializing in microcontrollers, analog components, and nonvolatile memory solutions for industrial, automotive, and communications markets.
The AT25PE40-SSHN-B belongs to Microchip's DataFlash-L® family, designed specifically for high-reliability, low-voltage serial Flash applications demanding concurrent read/write, ultra-low power, and hardware-level security features.
FAQ
What is the default page size for AT25PE40-SSHN-B, and can it be changed?
The AT25PE40-SSHN-B ships with a default page size of 256 bytes. A customer-selectable 264-byte page option is available at ordering - this variant is factory-configured and cannot be changed in-circuit. The 264-byte mode supports embedded ECC or metadata fields within each page, improving data integrity in safety-critical applications. Both configurations are fully supported by all AT25PE40-SSHN-B command sets and timing specifications.
Does AT25PE40-SSHN-B support true SPI mode 3 (CPOL=1, CPHA=0)?
Yes, AT25PE40-SSHN-B explicitly supports both SPI mode 0 (CPOL=0, CPHA=0) and mode 3 (CPOL=1, CPHA=0) per its datasheet DS-25PE40-142D. In mode 3, SCK idles high, and data is sampled on the falling edge - matching the timing requirements of many ARM Cortex-M and RISC-V host processors. All RapidS™ high-speed read commands (0Bh, 1Bh) and standard instructions operate correctly in either mode.
How does the dual-buffer architecture of AT25PE40-SSHN-B improve system-level write performance?
The AT25PE40-SSHN-B's two independent 256/264-byte SRAM buffers allow simultaneous data reception into one buffer while the other is being programmed into Flash - eliminating CPU wait states during page programming. This interleaving enables sustained write throughput even at maximum 85 MHz SCK, and supports real-time streaming use cases like audio buffering or sensor fusion without external RAM. Buffer-to-main-memory page program commands execute in ≤20 ms (typical).
Is the 128-byte security register in AT25PE40-SSHN-B writable or read-only?
The 128-byte security register in AT25PE40-SSHN-B is factory-programmed with a unique device identifier and is permanently read-only. It cannot be altered after manufacture - ensuring cryptographic binding between hardware identity and firmware. Access is via standard SPI read command (48h opcode), and the register contents remain intact across power cycles, resets, and all erase operations. This provides tamper-evident device authentication for secure boot and provisioning workflows.
What is the purpose of the RESET pin on AT25PE40-SSHN-B, and is it mandatory to connect?
The RESET pin on AT25PE40-SSHN-B provides hardware-level abort of ongoing erase or program operations and forces the internal state machine back to idle - essential for fault recovery in safety-critical systems. While the device includes an internal power-on reset circuit, Microchip recommends externally driving RESET high if unused. Leaving it floating is discouraged; tying to VCC via a pull-up resistor ensures deterministic behavior during brown-out or ESD events. The pin is not required for basic operation but strongly advised for robust system design.
AT25PE40-SSHN-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SSHN-B FAQ
1.How can I place an order for AT25PE40-SSHN-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25PE40-SSHN-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-SSHN-B reliable?
The price and inventory of AT25PE40-SSHN-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-SSHN-B is usually 5 days.
3.What payment methods are accepted for AT25PE40-SSHN-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25PE40-SSHN-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25PE40-SSHN-B?
AT25PE40-SSHN-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25PE40-SSHN-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-SSHN-B?
For technical support, including AT25PE40-SSHN-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25PE40-SSHN-B requirements.
6.How does Aetrix verify that AT25PE40-SSHN-B is sourced from the original manufacturer or authorized distributors?
All AT25PE40-SSHN-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-SSHN-B meets industry standards.
7.What is the process for return or replacement of AT25PE40-SSHN-B?
All AT25PE40-SSHN-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25PE40-SSHN-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-SSHN-B part is unused and in its original packaging.
Return procedure for AT25PE40-SSHN-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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