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Microchip Technology AT25040A-10TU-2.7
- Part No.:
- AT25040A-10TU-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT25040A-10TU-2.7.pdf
- Description:
- IC EEPROM 4KBIT SPI 20MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,111
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Product details
Overview
AT25040A-10TU-2.7 from Microchip Technology (formerly Atmel) is a 4-kbit serial SPI EEPROM organized as 512 words × 8 bits, operating from 2.7V to 5.5V, supporting 20 MHz clock rate at 5V, featuring 8-byte page write, block write protection (1/4, 1/2, or full array), and hardware/software data protection via WP pin and WREN/WRDI instructions. It serves in industrial control systems for parameter storage and calibration retention.
For engineers reviewing the AT25040A-10TU-2.7 datasheet, AT25040A-10TU-2.7 pinout, AT25040A-10TU-2.7 application, or AT25040A-10TU-2.7 equivalent, this page delivers verified electrical specs, TSSOP-8 package mapping, SPI Mode 0/3 compatibility, endurance (1M cycles), and real-world use cases in embedded firmware configuration and sensor calibration storage.
Technical Context
The AT25040A-10TU-2.7 implements a synchronous serial peripheral interface (SPI) slave architecture with dedicated SI/SO pins, CS-controlled selection, and HOLD pin for pausing communication without reset. Its status register (BP1/BP0/WEN/RDY) enables nonvolatile block protection and real-time write-busy monitoring.
It uses self-timed internal write cycles (≤5 ms), requires no external erase command, and supports both hardware (WP pin low) and software (WRSR) write inhibition. The device operates across −40°C to +85°C and is qualified for industrial temperature range with RoHS-compliant TSSOP-8 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 kbit (512 × 8-bit words) - sufficient for firmware configuration tables or sensor calibration coefficients in space-constrained designs. |
| Supply Voltage Range | 2.7V to 5.5V - compatible with 3.3V and 5V microcontroller I/O domains without level shifting. |
| Max Clock Frequency | 20 MHz at VCC = 5V - enables fast parameter reads/writes in high-throughput embedded hosts. |
| Write Endurance | 1 million cycles - supports frequent recalibration or logging in industrial monitoring applications. |
| Data Retention | 100 years - ensures long-term reliability of stored settings across product lifetime without refresh. |
| Page Write Size | 8 bytes - minimizes write latency per transaction while avoiding overwriting adjacent configuration fields. |
| Operating Temperature | −40°C to +85°C - certified for industrial environments including factory automation and outdoor metering. |
Pinout & Package
AT25040A-10TU-2.7 is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP), 0.170" wide, RoHS-compliant, with gull-wing leads and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: asserts SPI communication; high-Z SO when deasserted. |
| SCK | Serial Clock | Input-only master-generated clock; defines timing for SI/SO data sampling (Mode 0/3). |
| SI | Serial Data Input | Receives op-codes (READ/WRITE/WREN), addresses, and data; MSB-first protocol. |
| SO | Serial Data Output | Drives read data or status register bits; high-impedance when CS high or HOLD active. |
| GND | Ground Reference | Return path for VCC and all I/O; must be low-impedance to minimize noise on SPI lines. |
| VCC | Power Supply | 2.7–5.5V supply; decoupling capacitor (0.1 µF) required near pin for stable operation. |
| WP | Write Protect | Hardware lock: low disables all writes regardless of WREN state; critical for field firmware safety. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer (e.g., during MCU interrupt) without resetting address counter. |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperates with diverse MCUs (e.g., AVR, PIC, ARM Cortex-M) without protocol translation logic. |
| Block Write Protection | Configurable via status register to lock 1/4, 1/2, or entire memory - prevents accidental overwrite of boot parameters. |
| Self-Timed Write Cycle | No external timing control needed; ≤5 ms max duration simplifies host firmware timing design. |
| Low Standby Current | 0.2 µA at 2.7V - extends battery life in portable or energy-harvesting sensor nodes. |
| HOLD Pin Functionality | Enables deterministic pause/resume of multi-byte transfers during real-time system interrupts. |
Applications
| Industrial PLC Configuration Storage | Smart Sensor Calibration Data Retention |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via SPI during power-up and runtime reconfiguration. Use Value: Enables field-upgradable settings without firmware reflashing; 100-year data retention ensures parameter integrity across equipment lifecycle. |
Use Scenario: Holding factory-trimmed offset/gain coefficients and temperature compensation tables in MEMS accelerometers and pressure sensors. IC Role / Device Role / Timing Role: SPI-accessible calibration memory read at sensor initialization to correct analog front-end errors. Use Value: Eliminates need for external trimming components; 1M endurance supports recalibration during maintenance cycles. |
| Medical Device Parameter Backup | IoT Edge Node Firmware Settings |
Use Scenario: Preserving user-adjusted therapy parameters (e.g., infusion rates, alarm limits) in portable medical pumps and monitors. IC Role / Device Role / Timing Role: Secure, WP-protected EEPROM storing critical operational settings with hardware write lock. Use Value: Meets IEC 62304 safety requirements via dual protection (WP pin + WRSR); −40°C to +85°C rating covers clinical environments. |
Use Scenario: Storing network credentials (Wi-Fi SSID/password), OTA update flags, and device-specific identifiers in battery-powered IoT gateways. IC Role / Device Role / Timing Role: Low-power SPI EEPROM accessed during boot and OTA update preparation. Use Value: 0.2 µA standby current extends 10-year battery life; TSSOP-8 footprint fits compact PCB layouts. |
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 supply, 20 MHz max, TSSOP-8, same pinout but different status register BP bit mapping. | Supports wider voltage range (1.8V); lacks HOLD pin - unsuitable where interrupt-driven SPI suspension is required. | Select if 1.8V operation is mandatory and HOLD functionality is unused. |
| CAT25040VI-GT3 | 4-kbit SPI EEPROM, 1.8–5.5V, 20 MHz, TSSOP-8, identical pinout and instruction set, but only 100k write cycles endurance. | Lower endurance limits use in high-write-frequency logging; same WP/HOLD functionality and block protection. | Choose for cost-sensitive designs where <100k writes expected over product life. |
Compared with M95040-DRMN6TP/K and CAT25040VI-GT3, AT25040A-10TU-2.7 provides guaranteed 1M write cycles and HOLD pin support - critical for industrial systems requiring robust, interrupt-tolerant configuration storage under frequent updates.
Availability
AT25040A-10TU-2.7 is available at Aetrix Electronics and suitable for industrial control systems, smart sensor modules, medical device parameter backup, and IoT edge node firmware settings requiring stable component supply and long-term obsolescence management.
Supply support for AT25040A-10TU-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 technical and manufacturing continuity for the AT25xxx serial EEPROM family.
The AT25040A-10TU-2.7 belongs to Microchip's industrial-grade serial EEPROM product line, designed specifically for reliable nonvolatile data storage in resource-constrained embedded systems with stringent longevity and environmental requirements.
FAQ
What is the maximum clock frequency supported by AT25040A-10TU-2.7?
The AT25040A-10TU-2.7 supports up to 20 MHz SCK frequency when operated at VCC = 5.0V. At 2.7V, the maximum clock rate is 10 MHz, and at 1.8V it drops to 5 MHz - values confirmed in Table 4 of the official datasheet. This graded performance ensures timing compliance across its full 2.7–5.5V supply range.
Does AT25040A-10TU-2.7 support SPI Mode 0 and Mode 3 simultaneously?
Yes, AT25040A-10TU-2.7 is explicitly specified to support both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1). The datasheet states compatibility with both modes, though the functional description and timing diagrams focus on Mode 0 operation - Mode 3 interoperability is validated through electrical specification and interface logic.
How does the WRITE PROTECT (WP) pin function on AT25040A-10TU-2.7?
When the WP pin is driven low, AT25040A-10TU-2.7 inhibits all write operations - including WREN, WRITE, and WRSR - regardless of the status register or WREN latch state. This hardware-level lock provides fail-safe protection against unintended writes during power transients or firmware faults, and is active even during active CS assertion.
What is the purpose of the HOLD pin on AT25040A-10TU-2.7?
The HOLD pin on AT25040A-10TU-2.7 allows the host MCU to suspend an ongoing SPI transaction (e.g., mid-read or mid-write sequence) without resetting the internal address counter or losing synchronization. When asserted low while SCK is low, SO enters high-impedance and SI is ignored - enabling deterministic handling of time-critical interrupts.
Can AT25040A-10TU-2.7 be used in automotive applications?
No - AT25040A-10TU-2.7 is rated for industrial temperature range (−40°C to +85°C) and is not qualified to AEC-Q100 standards. While the datasheet notes "Automotive Devices Available" for the broader AT25xxx family, the specific AT25040A-10TU-2.7 ordering code denotes industrial-grade qualification only; automotive variants carry distinct part numbers and packaging.
AT25040A-10TU-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- 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-TSSOP
AT25040A-10TU-2.7 FAQ
1.How can I place an order for AT25040A-10TU-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040A-10TU-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 AT25040A-10TU-2.7 reliable?
The price and inventory of AT25040A-10TU-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 AT25040A-10TU-2.7 is usually 5 days.
3.What payment methods are accepted for AT25040A-10TU-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040A-10TU-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040A-10TU-2.7?
AT25040A-10TU-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040A-10TU-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 AT25040A-10TU-2.7?
For technical support, including AT25040A-10TU-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040A-10TU-2.7 requirements.
6.How does Aetrix verify that AT25040A-10TU-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25040A-10TU-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 AT25040A-10TU-2.7 meets industry standards.
7.What is the process for return or replacement of AT25040A-10TU-2.7?
All AT25040A-10TU-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25040A-10TU-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 AT25040A-10TU-2.7 part is unused and in its original packaging.
Return procedure for AT25040A-10TU-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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