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Microchip Technology AT25040N-10SI-2.7
- Part No.:
- AT25040N-10SI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25040N-10SI-2.7.pdf
- Description:
- IC EEPROM 4KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,747
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Product details
Overview
AT25040N-10SI-2.7 from Atmel (now Microchip) is a 4-kbit SPI serial EEPROM organized as 512 × 8-bit memory, operating from 2.7V to 5.5V with 3.0 MHz max clock rate at 5V, 8-byte page write capability, and hardware/software write protection via WP pin and status register. It serves in industrial control systems for parameter storage, calibration data retention, and firmware configuration backup.
For engineers reviewing the AT25040N-10SI-2.7 datasheet, AT25040N-10SI-2.7 pinout, AT25040N-10SI-2.7 application, or AT25040N-10SI-2.7 equivalent, key selection considerations include its JEDEC SOIC-8 package, -40°C to +85°C industrial temperature range, block write protection granularity (1/4, 1/2, or full array), self-timed 10 ms max write cycle, and SPI Mode 0/3 compatibility with microcontrollers like 68HC11.
Technical Context
The AT25040N-10SI-2.7 implements a synchronous slave SPI interface with separate SI/SO pins, MSB-first data transfer, and CS-driven command framing. Its internal architecture includes an 8-bit instruction register supporting WREN/WRDI/RDSR/WRSR/READ/WRITE op-codes and a nonvolatile status register with BP1/BP0 bits controlling block protection levels.
It features dual write protection: hardware-level inhibition via the active-low WP pin and software-configurable array segmentation using the status register. The HOLD pin enables communication suspension without sequence reset, while the READY/BUSY bit (RDY) in the status register allows polling during internal write cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 words × 8 bits); sufficient for storing device IDs, calibration coefficients, or small configuration tables. |
| Supply Voltage Range | 2.7V to 5.5V; supports direct interfacing with 3.3V and 5V microcontroller I/O without level shifting. |
| Max Clock Frequency | 3.0 MHz at VCC = 5.0V; enables fast read/write throughput up to ~300 kbps in burst mode. |
| Write Cycle Time | ≤10 ms (self-timed); eliminates need for external timing control or busy-wait loops longer than 10 ms. |
| Endurance | 1 million write cycles; ensures reliable field operation over 10+ years in moderate-update applications. |
| Data Retention | 100 years at 25°C; guarantees long-term integrity of stored parameters without refresh. |
| Operating Temperature | -40°C to +85°C; qualified for industrial environments including factory automation and outdoor metering. |
Pinout & Package
AT25040N-10SI-2.7 uses an 8-lead JEDEC SOIC package (package code 8S1), 0.150" wide body, with standard gull-wing lead form and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; initiates serial command sequence on falling edge and terminates on rising edge. |
| SCK | Serial Clock | Input-only clock; synchronizes all SI/SO data transfers; supports SPI Modes 0 and 3 only. |
| SI | Serial Data Input | Command/address/data input path; accepts op-code, address, and write data MSB-first. |
| SO | Serial Data Output | Read data output path; tri-stated when CS is high or during HOLD assertion. |
| GND | Ground Reference | Primary return path for VCC and all I/O signals; requires low-impedance PCB connection. |
| VCC | Power Supply | Single supply input (2.7–5.5V); powers internal logic and memory array; bypass capacitor required. |
| WP | Write Protect | Hardware lock: low disables all write operations regardless of status register setting. |
| HOLD | Communication Suspend | Pauses ongoing SPI transaction without resetting address counter; requires SCK low to assert. |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Compatible with common MCU peripherals (e.g., 68HC11, AVR, PIC) without mode reconfiguration. |
| 8-byte Page Write | Reduces write overhead by enabling up to 8 sequential bytes per CS cycle, improving efficiency vs. byte-write. |
| Block Write Protection | Four protection levels (none, 1/4, 1/2, full) configurable via nonvolatile BP1/BP0 bits in status register. |
| WP Pin + Software Lock | Dual-layer protection prevents accidental writes: hardware (WP) and software (WRSR + WREN) mechanisms. |
| HOLD Functionality | Enables multi-master arbitration or CPU interrupt handling without losing SPI state or requiring re-initialization. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed infrequently during setup or firmware updates; no real-time timing constraints. Use Value: Ensures parameter persistence across power cycles and supports field recalibration without replacing hardware. |
Use Scenario: Retaining sensor offset/gain values and patient-specific settings in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant data vault; write-protected during normal operation using WP pin and BP bits. Use Value: Meets IEC 62304 data integrity requirements with 1M endurance and 100-year retention at room temperature. |
| Automotive Body Control Module | Smart Energy Meter Firmware Settings |
Use Scenario: Saving seat/mirror position presets and lighting profiles in automotive BCMs operating across extended temperature ranges. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced directly to 3.3V CAN microcontroller; operates from -40°C to +85°C. Use Value: Qualified for automotive ambient conditions without derating; WP pin prevents corruption during battery transients. |
Use Scenario: Storing tariff schedules, demand-response flags, and utility configuration in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: Low-power, secure memory element with software-controlled block protection for critical billing parameters. Use Value: Enables field-upgradable firmware settings while preventing unauthorized modification via WRSR locking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95040-DRMN6TP/K | 4-kbit SPI EEPROM, 2.5–5.5V supply, 20 MHz max clock, SOIC-8, same pinout but higher speed and lower VIL/VIH thresholds. | Supports faster host interfaces; better suited for high-throughput logging where >3 MHz bandwidth is needed. | Select when system clock exceeds 3 MHz or when tighter input voltage thresholds improve noise margin. |
| 25AA040A-I/P | 4-kbit SPI EEPROM, 1.8–5.5V supply, 10 MHz max clock, PDIP-8 package; identical instruction set but wider voltage range and different package. | Required for legacy through-hole designs or ultra-low-voltage (1.8V) host systems not supported by AT25040N-10SI-2.7. | Choose for 1.8V operation or if PDIP-8 mounting is mandatory; otherwise SOIC-8 compatibility favors AT25040N-10SI-2.7. |
Compared with M95040-DRMN6TP/K and 25AA040A-I/P, the AT25040N-10SI-2.7 offers optimal balance of industrial temperature rating, proven reliability at 3.0 MHz, and JEDEC SOIC-8 footprint - making it preferred for cost-sensitive, space-constrained industrial controllers where 3 MHz bandwidth suffices.
Availability
AT25040N-10SI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive body control modules, smart energy meters, and factory automation systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT25040N-10SI-2.7 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
Atmel Corporation, now part of Microchip Technology, is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and security ICs for industrial, automotive, and consumer applications.
The AT250xx family was designed specifically for robust, low-power serial EEPROM applications in resource-constrained embedded systems requiring guaranteed data integrity and simple SPI integration.
FAQ
What is the memory organization of the AT25040N-10SI-2.7?
The AT25040N-10SI-2.7 contains 4096 bits of serial EEPROM memory organized as 512 words × 8 bits. This structure supports byte-level addressing from 0x000 to 0x1FF, enabling direct access to individual configuration registers or calibration values without bit manipulation overhead.
Does the AT25040N-10SI-2.7 support SPI Mode 1 or Mode 2?
No, the AT25040N-10SI-2.7 explicitly supports only SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as confirmed in the Features section and Functional Description. Attempting Mode 1 or Mode 2 will result in incorrect data sampling or command rejection.
How does the WRITE PROTECT (WP) pin interact with the status register protection bits?
The WP pin provides hardware-level write inhibition: when low, it overrides all software-based protection (including BP1/BP0 settings) and blocks all write instructions. When WP is high, the status register's BP bits determine which memory segments are protected - allowing layered security in the AT25040N-10SI-2.7.
What is the maximum write endurance and data retention for the AT25040N-10SI-2.7?
The AT25040N-10SI-2.7 guarantees 1,000,000 write cycles per memory location and 100 years of data retention at 25°C. These values are characterized and specified in the Absolute Maximum Ratings and DC Characteristics sections of the official datasheet Rev. 0606M.
Can the AT25040N-10SI-2.7 be used in automotive applications?
The AT25040N-10SI-2.7 is rated for industrial temperature (-40°C to +85°C) and is not AEC-Q100 qualified. While it may function in some automotive body electronics, Atmel explicitly lists "Automotive Grade Devices Available" as a separate option - meaning this specific variant (AT25040N-10SI-2.7) is not automotive-qualified.
AT25040N-10SI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25040N-10SI-2.7 FAQ
1.How can I place an order for AT25040N-10SI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040N-10SI-2.7 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 AT25040N-10SI-2.7 reliable?
The price and inventory of AT25040N-10SI-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25040N-10SI-2.7 is usually 5 days.
3.What payment methods are accepted for AT25040N-10SI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040N-10SI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040N-10SI-2.7?
AT25040N-10SI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040N-10SI-2.7 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 AT25040N-10SI-2.7?
For technical support, including AT25040N-10SI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040N-10SI-2.7 requirements.
6.How does Aetrix verify that AT25040N-10SI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25040N-10SI-2.7 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 AT25040N-10SI-2.7 meets industry standards.
7.What is the process for return or replacement of AT25040N-10SI-2.7?
All AT25040N-10SI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25040N-10SI-2.7, 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 AT25040N-10SI-2.7 part is unused and in its original packaging.
Return procedure for AT25040N-10SI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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