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Microchip Technology AT25040AN-10SU-2.7-T
- Part No.:
- AT25040AN-10SU-2.7-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25040AN-10SU-2.7-T.pdf
- Description:
- IC EEPROM 4KBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,354
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Product details
Overview
AT25040AN-10SU-2.7-T from Microchip Technology (formerly Atmel) is a 4-kbit SPI serial EEPROM organized as 512 words × 8 bits, operating from 2.7V to 5.5V with 20 MHz max clock rate at 5V, 8-byte page write capability, and hardware/software write protection. It serves as nonvolatile configuration storage in industrial control modules, sensor calibration systems, and power supply management ICs.
For engineers reviewing the AT25040AN-10SU-2.7-T datasheet, AT25040AN-10SU-2.7-T pinout, AT25040AN-10SU-2.7-T application, or AT25040AN-10SU-2.7-T equivalent, key selection criteria include VCC range compatibility (2.7–5.5 V), SPI Mode 0/3 support, 1 million write endurance, 100-year data retention, and TSSOP-8 package footprint for space-constrained PCB layouts.
Technical Context
The AT25040AN-10SU-2.7-T implements a synchronous serial peripheral interface with dedicated SI/SO pins and supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). Its internal architecture includes an 8-bit instruction register, status register with BP0/BP1 block protection bits, and automatic address incrementing during multi-byte reads.
Write operations require explicit WREN instruction prior to WRITE command, and are inhibited when WP pin is low or status register WEN bit is cleared. The HOLD pin suspends ongoing serial communication without resetting the sequence, enabling master arbitration in multi-device SPI buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8), sufficient for firmware boot flags, calibration coefficients, or device ID storage |
| VCC Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level shifting |
| Max Clock Rate | 20 MHz at 5 V - enables fast configuration loading in real-time systems |
| Page Write Size | 8 bytes - minimizes write latency while avoiding overwriting adjacent memory locations |
| Endurance | 1 million write cycles - supports frequent recalibration or logging in industrial edge devices |
| Data Retention | 100 years - ensures long-term reliability in unattended infrastructure equipment |
| Operating Temp | −40°C to +85°C - qualified for industrial temperature range applications |
Pinout & Package
AT25040AN-10SU-2.7-T uses an 8-lead TSSOP package (JEDEC MO-153, 0.170" wide body, 0.65 mm pitch) with gull-wing leads. Dimensions: 3.00 mm × 4.40 mm × 1.20 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be low to accept instructions; high impedance SO when CS high |
| SCK | Serial Clock | Input-only clock; defines timing for SI sampling and SO output; supports up to 20 MHz |
| SI | Serial Data Input | Master-to-slave data path; receives op-codes, addresses, and write data MSB-first |
| SO | Serial Data Output | Slave-to-master data path; outputs read data and status register bits MSB-first |
| GND | Ground Reference | Return path for VCC and all I/O signals; requires low-impedance PCB plane connection |
| VCC | Power Supply | 2.7–5.5 V supply; decoupling capacitor (0.1 µF) required within 10 mm of pin |
| WP | Write Protect | Hardware lock: low = all writes disabled; independent of software WREN/WRSR state |
| HOLD | Communication Suspend | Pauses SPI transfer mid-sequence when low (SCK must be low); resumes on rising edge |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperable with diverse microcontrollers including 68HC11, PIC, and ARM Cortex-M series |
| Block Write Protection | Configurable via status register to protect 0%, 25%, 50%, or 100% of memory array |
| Self-timed Write Cycle | Max 5 ms duration; no external timing circuitry or polling overhead required |
| Low Standby Current | 0.2 µA typical at 2.7 V - extends battery life in always-on IoT endpoint devices |
| Industrial Temp Rating | −40°C to +85°C operation - validated for deployment in factory automation and outdoor metering |
Applications
| Industrial Sensor Calibration | Power Supply Configuration |
|---|---|
Use Scenario: Storing temperature-compensated gain/offset coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed during system boot and periodic recalibration routines. Use Value: Enables field-upgradable calibration without firmware reflash; retains values across 10+ year deployments. | Use Scenario: Holding digital setpoints, fault thresholds, and soft-start profiles in digitally controlled AC/DC power supplies. IC Role / Device Role / Timing Role: Configuration memory mapped to PMBus or proprietary host controller via SPI. Use Value: Allows OEM-specific tuning without hardware changes; supports multiple output voltage variants from single BOM. |
| Embedded System Bootloader | Medical Device Settings |
Use Scenario: Storing secure boot flags, firmware version stamps, and recovery partition pointers in medical imaging subsystems. IC Role / Device Role / Timing Role: Trusted configuration store verified before executing signed application code. Use Value: Meets IEC 62304 safety requirements for persistent state integrity; immune to accidental overwrite during updates. | Use Scenario: Retaining user-adjusted therapy parameters (e.g., infusion rate, alarm limits) in portable drug delivery pumps. IC Role / Device Role / Timing Role: Patient-specific data vault with hardware WP pin tied to mechanical interlock switch. Use Value: Guarantees parameter persistence through battery swaps and sterilization cycles; supports audit trail logging. |
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, TSSOP-8, but uses different status register layout and lacks HOLD pin | Requires firmware adaptation for status bit interpretation; not suitable where HOLD arbitration is critical | Select when cost sensitivity outweighs need for HOLD functionality and legacy Atmel register compatibility |
| CAT25040VI-GT3 | 4-kbit SPI EEPROM, 1.8–5.5 V, 10 MHz max, TSSOP-8, identical pinout but lower speed grade and no automotive qualification | Not rated for full industrial temp range; unsuitable for environments exceeding 70°C ambient | Choose for commercial-grade applications with relaxed timing and thermal requirements |
Compared with M95040-DRMN3TP/K and CAT25040VI-GT3, the AT25040AN-10SU-2.7-T provides guaranteed HOLD pin operation, consistent status register mapping per Atmel legacy designs, and full −40°C to +85°C qualification - making it optimal for industrial control and medical systems requiring deterministic SPI bus arbitration and long-term reliability.
Availability
AT25040AN-10SU-2.7-T is available at Aetrix Electronics and suitable for industrial sensor calibration, power supply configuration, embedded bootloader storage, and medical device settings requiring stable component supply across extended product lifecycles.
Supply support for AT25040AN-10SU-2.7-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 is a global semiconductor company specializing in microcontrollers, analog components, and memory solutions, with broad industrial and automotive qualifications.
The AT25040AN-10SU-2.7-T belongs to Microchip's legacy Atmel serial EEPROM product line, designed specifically for reliable, low-power nonvolatile storage in resource-constrained embedded systems requiring SPI interface simplicity and long data retention.
FAQ
What is the maximum clock frequency supported by AT25040AN-10SU-2.7-T?
The AT25040AN-10SU-2.7-T supports up to 20 MHz SCK frequency when VCC = 5.0 V, 10 MHz at 2.7 V, and 5 MHz at 1.8 V. These values are specified in Table 4 of the datasheet under AC Characteristics and reflect guaranteed timing margins across the full industrial temperature range. For robust operation in noisy environments, derating to 15 MHz at 5 V is recommended.
Does AT25040AN-10SU-2.7-T support SPI Mode 3 (CPOL=1, CPHA=1)?
Yes, AT25040AN-10SU-2.7-T explicitly supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as stated in the Features section of the datasheet. This dual-mode capability allows interoperability with microcontrollers that default to either polarity/phase configuration without requiring hardware modification or software workarounds.
How does the WRITE PROTECT (WP) pin function on AT25040AN-10SU-2.7-T?
The WP pin on AT25040AN-10SU-2.7-T provides hardware-level write inhibition: when pulled low, it blocks all write operations regardless of WREN instruction or status register settings. If WP goes low mid-write, pending writes are aborted. The pin must be held high during WREN execution, and its state is sampled synchronously with CS transitions to ensure deterministic behavior.
What is the purpose of the HOLD pin on AT25040AN-10SU-2.7-T?
The HOLD pin on AT25040AN-10SU-2.7-T allows a master device to temporarily suspend an active SPI transaction without resetting the internal address counter or command state. When asserted low (with SCK low), SO enters high-impedance and SI is ignored; resuming requires bringing HOLD high while SCK remains low. This enables multi-master arbitration and priority interrupt handling in shared SPI buses.
Can AT25040AN-10SU-2.7-T be used in automotive applications?
No - the AT25040AN-10SU-2.7-T is specified for industrial temperature range (−40°C to +85°C) and is not qualified to AEC-Q100 automotive standards. While the datasheet notes "Automotive Devices Available" for the AT250xxA family, those are distinct part numbers (e.g., AT25040A-10UQ-2.7) with separate qualification testing, packaging, and traceability. Using AT25040AN-10SU-2.7-T in automotive contexts violates Microchip's disclaimer and voids warranty.
AT25040AN-10SU-2.7-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:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25040AN-10SU-2.7-T FAQ
1.How can I place an order for AT25040AN-10SU-2.7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040AN-10SU-2.7-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-10SU-2.7-T reliable?
The price and inventory of AT25040AN-10SU-2.7-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-10SU-2.7-T is usually 5 days.
3.What payment methods are accepted for AT25040AN-10SU-2.7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040AN-10SU-2.7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040AN-10SU-2.7-T?
AT25040AN-10SU-2.7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040AN-10SU-2.7-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-10SU-2.7-T?
For technical support, including AT25040AN-10SU-2.7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040AN-10SU-2.7-T requirements.
6.How does Aetrix verify that AT25040AN-10SU-2.7-T is sourced from the original manufacturer or authorized distributors?
All AT25040AN-10SU-2.7-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-10SU-2.7-T meets industry standards.
7.What is the process for return or replacement of AT25040AN-10SU-2.7-T?
All AT25040AN-10SU-2.7-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25040AN-10SU-2.7-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-10SU-2.7-T part is unused and in its original packaging.
Return procedure for AT25040AN-10SU-2.7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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