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Microchip Technology AT25040AN-10SI-1.8-T
- Part No.:
- AT25040AN-10SI-1.8-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25040AN-10SI-1.8-T.pdf
- Description:
- IC EEPROM 4KBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,267
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Product details
Overview
AT25040AN-10SI-1.8-T from Microchip Technology (formerly Atmel) is a 4-kbit SPI serial EEPROM organized as 512 words × 8 bits, operating from 1.8 V to 5.5 V with 20 MHz max clock rate at 5 V, 8-byte page write capability, and hardware/software write protection. It serves as nonvolatile configuration storage in industrial microcontroller systems requiring low-voltage operation and automotive-grade reliability.
For engineers reviewing the AT25040AN-10SI-1.8-T datasheet, AT25040AN-10SI-1.8-T pinout, AT25040AN-10SI-1.8-T application, or AT25040AN-10SI-1.8-T equivalent, key selection factors include 1.8 V minimum supply, 8-lead SOIC package compatibility, block-level write protection (1/4, 1/2, or full array), HOLD/CS suspension logic, and 1 million write cycles endurance.
Technical Context
The AT25040AN-10SI-1.8-T implements a synchronous SPI slave interface supporting Modes 0 and 3, with separate SI (input) and SO (output) pins and MSB-first data framing. Its internal architecture includes an 8-bit instruction register, status register with RDY/WEN/BP bits, and automatic address incrementing during sequential reads.
Write operations require explicit WREN instruction followed by WRITE command; self-timed internal write cycle completes in ≤5 ms. Block protection is configured via nonvolatile BP0/BP1 bits in the status register, enabling selective lock of memory segments without external hardware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8), sufficient for firmware parameter tables or calibration data storage |
| Supply Voltage Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters |
| Max Clock Frequency | 20 MHz at VCC = 5 V - supports high-speed configuration loading in time-critical boot sequences |
| Page Write Size | 8 bytes - balances write speed and granularity for efficient small-data updates |
| Endurance | 1 million write cycles - ensures long-term reliability in field-updatable embedded devices |
| Data Retention | 100 years at 25°C - guarantees persistent storage across product lifecycle without refresh |
| Operating Temperature | −40°C to +85°C - certified for industrial and automotive under-hood environments |
Pinout & Package
AT25040AN-10SI-1.8-T is housed in an 8-lead JEDEC SOIC (8S1) package, 0.150" wide, surface-mount compatible with standard reflow profiles and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: initiates SPI communication sequence and resets internal state on falling edge |
| SCK | Serial Clock | Master-generated clock input; timing reference for SI sampling and SO output edges |
| SI | Serial Data Input | Receives op-codes, addresses, and write data; ignored when CS is high or HOLD is active |
| SO | Serial Data Output | Drives read data and status register contents; tri-states when CS is high or during HOLD |
| WP | Write Protect | Hardware lock: disables all write instructions when pulled low, independent of status register |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting address counter; requires SCK low to assert |
| VCC | Power Supply | 1.8–5.5 V input; powers internal logic and charge pump for write operations |
| GND | Ground | Reference return path for all I/O and internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 support | Interoperability with diverse MCU families including 68HC11, ARM Cortex-M, and PIC microcontrollers |
| Block write protection | Configurable 1/4, 1/2, or full-array lock via status register BP bits - prevents accidental firmware corruption |
| HOLD pin functionality | Non-disruptive pause of serial transfers - essential for multi-master arbitration or real-time interrupt handling |
| Self-timed write cycle | No external erase step required; internal timing eliminates need for software delay loops or polling overhead |
| Low-power standby | 0.1 µA typical current at 1.8 V - critical for battery-backed systems and energy harvesting applications |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module Calibration |
|---|---|
Use Scenario: Storing I/O mapping, scaling coefficients, and fault history in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up and runtime parameter updates via SPI. Use Value: Ensures deterministic startup behavior and retains settings through brownouts, leveraging 100-year data retention and −40°C to +85°C operation. |
Use Scenario: Holding seat position offsets, mirror angle presets, and lighting profiles in vehicle body control units. IC Role / Device Role / Timing Role: Secure parameter store with hardware WP pin preventing unintended writes during CAN bus activity or ECU reset sequences. Use Value: Meets automotive AEC-Q100 stress requirements and supports 1 million-cycle durability for frequent user adjustments. |
| Medical Device Sensor Calibration Data | Smart Energy Meter Firmware Parameters |
Use Scenario: Archiving factory-calibrated gain/offset values for temperature, pressure, and flow sensors in portable diagnostic equipment. IC Role / Device Role / Timing Role: Trusted data vault accessed only during manufacturing test or authorized service mode via secure SPI commands. Use Value: Achieves traceable calibration integrity using write-disable instructions and status-register-based protection enforcement. |
Use Scenario: Storing tariff schedules, metering constants, and communication keys in ANSI C12.22-compliant utility meters. IC Role / Device Role / Timing Role: Tamper-resistant configuration memory with dual protection (WP pin + WRSR-controlled BP bits) against unauthorized reprogramming. Use Value: Supports regulatory compliance via guaranteed 100-year retention and immunity to voltage glitch attacks during power transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95040-DRMN3TP/K | 4-kbit SPI EEPROM, 1.8–5.5 V, 20 MHz, same 8-lead SOIC package but STMicroelectronics silicon; RDY bit implemented differently (busy flag active-high vs. AT25040A's active-low RDY) | Requires firmware adjustment for status polling logic due to inverted RDY polarity and different op-code timing margins | Select when sourcing from STMicroelectronics-qualified supply chains or where cross-manufacturer second-source validation is mandated |
| BR24G04FJ-WE2 | 4-kbit I²C EEPROM (not SPI), 1.7–5.5 V, 400 kHz standard mode, 8-lead TSSOP - different interface protocol and slower serial speed | Not pin-compatible; requires PCB redesign and driver stack replacement from SPI to I²C | Choose only if system already uses I²C infrastructure and SPI bus loading must be minimized |
Compared with M95040-DRMN3TP/K and BR24G04FJ-WE2, the AT25040AN-10SI-1.8-T provides native SPI Mode 0/3 compatibility, HOLD pin support for interrupt-safe transfers, and tighter AC timing specs at 1.8 V - making it optimal for resource-constrained microcontrollers needing deterministic, low-latency nonvolatile storage.
Availability
AT25040AN-10SI-1.8-T is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical sensor calibration systems, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for AT25040AN-10SI-1.8-T 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 technical and manufacturing continuity for the AT25xxx family of serial EEPROMs.
The AT25040AN-10SI-1.8-T belongs to Microchip's industrial-grade SPI EEPROM product line, engineered for robustness in harsh environments with emphasis on low-voltage operation, high endurance, and automotive qualification.
FAQ
What is the maximum clock frequency supported by AT25040AN-10SI-1.8-T at 1.8 V?
The AT25040AN-10SI-1.8-T supports up to 5 MHz SCK frequency when operated at 1.8 V, as specified in Table 4 of the datasheet under the 1.8–5.5 V voltage column. This is lower than its 20 MHz rating at 5 V but ensures reliable timing margin across process and temperature variations.
Does AT25040AN-10SI-1.8-T require an external pull-up resistor on the SO pin?
No, AT25040AN-10SI-1.8-T features an actively driven SO output with push-pull structure - no external pull-up is needed. The SO pin enters high-impedance state only when CS is high or HOLD is asserted, eliminating bus contention in multi-device SPI configurations.
How does the HOLD function interact with the CS signal in AT25040AN-10SI-1.8-T?
In AT25040AN-10SI-1.8-T, HOLD suspends serial communication only when asserted while CS is low and SCK is low. If CS goes high during HOLD, the device exits both selection and hold states. Resuming requires bringing HOLD high while SCK remains low - preserving the exact byte count and address pointer.
Can AT25040AN-10SI-1.8-T be used in place of AT25040A-10SI-2.7 without design changes?
Yes, AT25040AN-10SI-1.8-T is backward compatible with AT25040A-10SI-2.7 in the same 8-lead SOIC package and pinout. The "N" suffix denotes lead-free/halogen-free construction, and the "1.8" option extends voltage range downward - no layout or firmware changes are required for migration.
What happens if the WP pin is pulled low during an active write cycle in AT25040AN-10SI-1.8-T?
If WP is pulled low after the internal write cycle has started in AT25040AN-10SI-1.8-T, the ongoing write completes normally. WP only inhibits new write instructions (WREN, WRITE, WRSR); it does not abort in-progress programming, ensuring data integrity during transient voltage events.
AT25040AN-10SI-1.8-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 20 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25040AN-10SI-1.8-T FAQ
1.How can I place an order for AT25040AN-10SI-1.8-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040AN-10SI-1.8-T 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 AT25040AN-10SI-1.8-T reliable?
The price and inventory of AT25040AN-10SI-1.8-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25040AN-10SI-1.8-T is usually 5 days.
3.What payment methods are accepted for AT25040AN-10SI-1.8-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040AN-10SI-1.8-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040AN-10SI-1.8-T?
AT25040AN-10SI-1.8-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040AN-10SI-1.8-T 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 AT25040AN-10SI-1.8-T?
For technical support, including AT25040AN-10SI-1.8-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040AN-10SI-1.8-T requirements.
6.How does Aetrix verify that AT25040AN-10SI-1.8-T is sourced from the original manufacturer or authorized distributors?
All AT25040AN-10SI-1.8-T 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 AT25040AN-10SI-1.8-T meets industry standards.
7.What is the process for return or replacement of AT25040AN-10SI-1.8-T?
All AT25040AN-10SI-1.8-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25040AN-10SI-1.8-T, 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 AT25040AN-10SI-1.8-T part is unused and in its original packaging.
Return procedure for AT25040AN-10SI-1.8-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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