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Microchip Technology AT25040N-10SC-2.7
- Part No.:
- AT25040N-10SC-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25040N-10SC-2.7.pdf
- Description:
- IC EEPROM 4KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,829
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Product details
Overview
AT25040N-10SC-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, supporting 2.1 MHz clock rate at 5V, with 8-byte page write and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in microcontroller-based industrial sensors and power management modules.
For engineers reviewing the AT25040N-10SC-2.7 datasheet, AT25040N-10SC-2.7 pinout, AT25040N-10SC-2.7 application, or AT25040N-10SC-2.7 equivalent, key selection criteria include VCC range compatibility (2.7–5.5V), 8-pin SOIC package footprint, SPI Mode 0/3 timing compliance, and block-level write protection granularity (1/4, 1/2, or full array).
Technical Context
The AT25040N-10SC-2.7 implements a synchronous SPI slave interface with separate SI/SO pins, MSB-first data transfer, and CS-driven command framing. Its instruction set includes WREN/WRDI for volatile write-enable control and RDSR/WRSR for nonvolatile status register access.
It features self-timed internal write cycles (≤10 ms), automatic address increment during page writes, and HOLD pin support for mid-sequence communication suspension without reset. Block protection is implemented via BP1/BP0 bits in the status register, mapping to fixed memory segments (000–1FFh for AT25040).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 words × 8 bits), sufficient for firmware parameter tables or calibration data in compact embedded systems. |
| Supply Voltage Range | 2.7V to 5.5V - enables direct interfacing with 3.3V and 5V microcontrollers without level-shifting. |
| Max Clock Frequency | 2.1 MHz at 5V - supports high-throughput configuration loading in time-constrained boot sequences. |
| Write Cycle Time | 10 ms maximum - defines worst-case latency for saving critical state data during power-fail events. |
| Endurance | 1 million write cycles - ensures reliable logging over 10+ years in data-logging applications with daily writes. |
| Data Retention | 100 years at 25°C - guarantees long-term integrity of factory-trimmed coefficients or security keys. |
| ESD Protection | >4000V HBM - provides robustness against handling-induced transients in manufacturing and field service. |
Pinout & Package
AT25040N-10SC-2.7 uses an 8-lead JEDEC-standard SOIC package (8S1, 0.150" wide), pin-compatible with industry-standard 8-pin SOIC footprints and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be low to accept instructions; high impedance on SO when CS is high. |
| SCK | Serial Clock | Master-generated clock input; timing reference for SI sampling and SO output; supports SPI Modes 0 and 3. |
| SI | Serial Data Input | Unidirectional command/address/data input path; MSB-first; ignored during HOLD or write cycles. |
| SO | Serial Data Output | Unidirectional read-data output; tri-stated when CS is high or during HOLD; valid within tV after SCK edge. |
| GND | Ground Reference | Primary return path for VCC and I/O; requires low-impedance connection to minimize noise coupling into SPI lines. |
| VCC | Power Supply | Single supply input (2.7–5.5V); powers internal logic and memory array; decoupling capacitor required per layout guidelines. |
| WP | Write Protect | Hardware lock: low = all write instructions inhibited; overrides software WREN; no effect once internal write starts. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting sequence; requires SCK low during assertion; resumes on rising edge. |
Key Features
| Feature | Design Value |
|---|---|
| 8-byte page write mode | Reduces average write time per byte by batching; enables efficient update of consecutive configuration registers. |
| Four-level block write protection | Allows selective locking of top quarter (180–1FFh), top half (100–1FFh), or entire array (000–1FFh) via BP1/BP0 bits. |
| Dual write protection mechanism | Combines hardware (WP pin) and software (WRSR + WREN) controls to prevent accidental or malicious writes. |
| HOLD pin functionality | Enables master MCU to pause EEPROM communication mid-transfer-critical for real-time interrupt handling. |
| Industrial temperature range | Rated for -40°C to +85°C operation, validated across full VCC range, supporting deployment in automotive body controllers. |
Applications
| Industrial Sensor Calibration Storage | Smart Meter Firmware Parameter Table |
|---|---|
|
Use Scenario: Storing factory-calibrated ADC offset/gain coefficients and temperature compensation curves in environmental monitoring nodes. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-up initialization; read-only during normal operation. Use Value: Eliminates need for external trimming components; enables field recalibration via secure write commands with BP0/BP1 lock. |
Use Scenario: Holding tariff schedules, billing counters, and communication protocol settings in utility-grade electricity meters. IC Role / Device Role / Timing Role: Secure parameter archive with WP pin hardwired to system supervisor; updated only during authenticated firmware updates. Use Value: Prevents tampering with billing data using hardware-level write lock; 1M endurance supports 10+ years of daily counter increments. |
| Embedded Power Supply Sequencing Log | Medical Device Configuration Profile |
|
Use Scenario: Recording last-known power rail states and fault codes in multi-rail DC-DC sequencers for recovery diagnostics. IC Role / Device Role / Timing Role: Fast-write-capable log buffer; writes triggered by brown-out detection circuitry via dedicated GPIO. Use Value: 10 ms max write cycle allows capture before backup capacitors deplete; HOLD pin enables atomic save during interrupt servicing. |
Use Scenario: Storing patient-specific therapy parameters and device serialization data in portable infusion pumps. IC Role / Device Role / Timing Role: HIPAA-compliant secure storage; write-protected except during clinical programming via encrypted USB interface. Use Value: 100-year data retention meets medical device regulatory requirements; ESD >4kV ensures reliability during hospital ESD-prone environments. |
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, 1.8–5.5V, 20 MHz max clock, 5 ms write cycle, same 8-pin SOIC package. | Higher speed and lower write latency; lacks HOLD pin and has different status register bit mapping. | Preferred for high-throughput logging where HOLD is unnecessary and faster writes reduce MCU wait time. |
| 25LC040A-I/P | 4-Kbit SPI EEPROM, 2.5–5.5V, 10 MHz max clock, 5 ms write cycle, 8-pin PDIP/SOIC options. | Wider VCC min (2.5V), but no 2.7V-specific variant; identical pinout and instruction set to AT25040 family. | Drop-in replacement if 2.5V operation is needed; otherwise, AT25040N-10SC-2.7 offers tighter VCC spec alignment and documented -2.7 suffix validation. |
Compared with M95040-DRMN6TP/K and 25LC040A-I/P, the AT25040N-10SC-2.7 provides guaranteed 2.7V operation, HOLD pin support for deterministic interrupt handling, and Atmel's legacy industrial qualification-making it optimal for cost-sensitive, timing-critical, or legacy-design-refresh scenarios.
Availability
AT25040N-10SC-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration storage, smart meter firmware parameter tables, and embedded power supply sequencing logs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT25040N-10SC-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
Microchip Technology acquired Atmel in 2016 and maintains full support for the legacy AT25xxx SPI EEPROM family, including datasheets, errata, and long-term supply commitments.
The AT25040N-10SC-2.7 belongs to Atmel's SPI Serial EEPROM product line, designed specifically for low-power, space-constrained embedded systems needing reliable, pin-efficient nonvolatile storage with flexible voltage and protection options.
FAQ
What is the exact memory organization of the AT25040N-10SC-2.7?
The AT25040N-10SC-2.7 contains 4096 bits of EEPROM memory organized as 512 words of 8 bits each (512 × 8). Its address space spans 000h to 1FFh, with block write protection levels mapped to specific segments: 1/4 protection covers 180–1FFh, 1/2 covers 100–1FFh, and full protection covers 000–1FFh. This structure is fixed and verified in the device's functional description and Table 4 of the datasheet.
Does the AT25040N-10SC-2.7 support SPI Mode 1 or Mode 2?
No, the AT25040N-10SC-2.7 explicitly supports only SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as stated in the Features section. It does not support Mode 1 (CPOL = 0, CPHA = 1) or Mode 2 (CPOL = 1, CPHA = 0). Attempting to use unsupported modes will result in incorrect data sampling or communication failure.
How does the HOLD pin function during an active write cycle in the AT25040N-10SC-2.7?
The HOLD pin has no effect during an internal write cycle (tWC) in the AT25040N-10SC-2.7. Once the CS high-to-low transition completes the WRITE instruction and the internal write begins, all inputs-including HOLD-are ignored until the write finishes and RDY returns to 0. HOLD is only effective during read or instruction-transfer phases.
Can the AT25040N-10SC-2.7 be used with a 1.8V microcontroller system?
No-the AT25040N-10SC-2.7 is rated for 2.7V to 5.5V operation only. For 1.8V systems, the correct variant is AT25040N-10SC-1.8, which specifies 1.8V to 3.6V operation and reduced AC timing (e.g., 0.5 MHz max SCK). Using AT25040N-10SC-2.7 below 2.7V violates absolute minimum VCC and risks unreliable reads/writes or data corruption.
What happens if the WP pin is pulled low during a WREN instruction on the AT25040N-10SC-2.7?
If WP is low during execution of the WREN (Write Enable) instruction on the AT25040N-10SC-2.7, the instruction is ignored and the Write Enable Latch remains reset. The device stays in write-disabled state, and subsequent WRITE or WRSR commands will be rejected. WP must be high throughout WREN for successful enablement-this behavior is explicitly defined in the Functional Description section.
AT25040N-10SC-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25040N-10SC-2.7 FAQ
1.How can I place an order for AT25040N-10SC-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040N-10SC-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-10SC-2.7 reliable?
The price and inventory of AT25040N-10SC-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-10SC-2.7 is usually 5 days.
3.What payment methods are accepted for AT25040N-10SC-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040N-10SC-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040N-10SC-2.7?
AT25040N-10SC-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040N-10SC-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-10SC-2.7?
For technical support, including AT25040N-10SC-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040N-10SC-2.7 requirements.
6.How does Aetrix verify that AT25040N-10SC-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25040N-10SC-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-10SC-2.7 meets industry standards.
7.What is the process for return or replacement of AT25040N-10SC-2.7?
All AT25040N-10SC-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25040N-10SC-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-10SC-2.7 part is unused and in its original packaging.
Return procedure for AT25040N-10SC-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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