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Microchip Technology 25AA040AT-I/MC
- Part No.:
- 25AA040AT-I/MC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
25AA040AT-I/MC.pdf
- Description:
- IC EEPROM 4KBIT SPI 10MHZ 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,334
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Product details
Overview
25AA040AT-I/MC from Microchip Technology Inc. is a 4 Kbit SPI Serial EEPROM with 512 × 8-bit organization, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It supports up to 10 MHz clock frequency, 16-byte page write mode, and hardware write protection via WP pin. Used for nonvolatile parameter storage in microcontroller-based embedded systems requiring low-power, high-reliability data retention.
For engineers reviewing the 25AA040AT-I/MC datasheet, 25AA040AT-I/MC pinout, 25AA040AT-I/MC application, or 25AA040AT-I/MC equivalent, key selection criteria include SPI interface compatibility, 1.8 V minimum operating voltage, 5 µA standby current, and MC package footprint suitability for space-constrained PCB layouts.
Technical Context
The 25AA040AT-I/MC implements a standard SPI Mode 0,0/1,1 interface with separate SI (MOSI) and SO (MISO) lines, CS-controlled selection, and HOLD input for transaction suspension. Its internal architecture includes a 512-byte EEPROM array, page latches, status register (WIP/WEL/BP0/BP1), and HV generator for write/erase operations.
Write enable latch (WEL) must be set via WREN instruction before any write; WP pin asserts hardware-level block protection independent of software configuration. Internal self-timed write cycles complete in ≤5 ms, and endurance is rated at 1,000,000 erase/write cycles with >200 years data retention at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit), sufficient for firmware calibration tables or device configuration registers. |
| Interface | SPI-compatible serial bus (CS, SCK, SI, SO, HOLD, WP), compatible with PIC® and ARM Cortex-M MCU SPI peripherals. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5 V - enables fast parameter read/write in real-time control loops. |
| Supply Voltage Range | 1.8 V to 5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V logic domains without level shifters. |
| Standby Current | 5 µA at 5.5 V and +125°C - critical for battery-powered IoT sensor nodes requiring multi-year operation. |
| Endurance | 1,000,000 erase/write cycles - ensures robust logging capability in industrial data recorders. |
| Data Retention | >200 years at 25°C - guarantees long-term integrity of stored calibration or security keys. |
Pinout & Package
25AA040AT-I/MC is housed in an 8-lead DFN (2 mm × 3 mm, 0.5 mm pitch) package with exposed pad. Pin 1 is marked by laser dot; exposed pad may be connected to VSS or left floating per design requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable signal; drives device into active mode and initiates internal write cycle on rising edge after valid command sequence. |
| SO | Serial Data Output | MISO line; outputs memory data on falling edge of SCK during READ; tri-states when CS high or HOLD low. |
| WP | Write-Protect Pin | Hardware lock: low = all writes disabled (array + STATUS register); overrides WEL state and persists across power cycles. |
| VSS | Ground | Reference node for all I/O and internal circuitry; must be low-impedance connection to minimize noise coupling. |
| SI | Serial Data Input | MOSI line; accepts instructions, addresses, and write data on rising edge of SCK; sampled after CS assertion. |
| SCK | Serial Clock Input | Master-generated clock; defines timing for SI sampling (rising edge) and SO output (falling edge); supports up to 10 MHz. |
| HOLD | Hold Input | Pauses ongoing SPI transaction without resetting state; requires low-to-high transition while SCK is low to resume. |
| VCC | Supply Voltage | Power input (1.8–5.5 V); internal regulator ensures stable core voltage across full VCC range. |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Mode | Up to 16 bytes written per internal cycle - reduces firmware overhead and improves update efficiency vs. byte-by-byte writes. |
| Block Write Protection | Configurable via STATUS register (BP0/BP1) to protect none, 1/4, 1/2, or full 512-byte array - enables secure partitioning of user vs. factory data. |
| Power-On Write Disable | WEL reset at power-up prevents accidental writes during brown-out or startup transients - eliminates need for external POR sequencing. |
| HOLD Function | Halts SPI communication mid-sequence without losing address pointer or command state - allows host MCU to service higher-priority interrupts. |
| ESD Robustness | >4 kV HBM on all pins - enhances reliability in handling-sensitive industrial assembly environments. |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and sensor linearization tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed at boot and during field recalibration; SPI read latency <160 ns at 1.8 V enables sub-millisecond initialization. Use Value: Eliminates need for external trimming components and supports post-manufacture calibration updates without firmware reflash. |
Use Scenario: Holding patient-specific therapy parameters and device serial/audit logs in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant data vault with hardware WP pin and 1M-cycle endurance for frequent log updates. Use Value: Meets IEC 62304 Class C software safety requirements via deterministic write completion and built-in data integrity safeguards. |
| Automotive Body Control Module | Smart Energy Metering |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and error codes in 12 V automotive BCMs with wide-input DC-DC supplies. IC Role / Device Role / Timing Role: Low-voltage EEPROM interface (1.8 V min) tolerant of cold-crank conditions; operates across –40°C to +85°C ambient. Use Value: Enables seamless user preference persistence despite battery voltage dips below 6 V during engine start. |
Use Scenario: Recording tariff schedules, demand-response events, and meter firmware version history in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: High-reliability data logger with >200-year retention - ensures regulatory compliance over 20+ year field life. Use Value: Avoids costly field replacements due to data corruption; supports remote firmware validation via stored hash values. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA040AT-I/SN | Same die, SOIC-8 package (4.9 × 6.0 mm); no exposed pad; 0.15 mm lead thickness. | Preferred for through-hole prototyping or legacy board upgrades where DFN rework is impractical. | Select when mechanical compatibility with existing SOIC footprints is required and thermal performance is secondary. |
| AT25040B-MAHL-T | 4 Kbit SPI EEPROM from Microchip (Atmel lineage); 1.8–5.5 V; 5 ms max write time; but only 100k endurance cycles. | Lower endurance makes it unsuitable for high-frequency logging; identical pinout and command set. | Choose only for cost-sensitive, low-write-count applications where 1M-cycle endurance is not mandatory. |
Compared with 25AA040AT-I/SN, the 25AA040AT-I/MC offers superior thermal dissipation via exposed pad and smaller footprint, while AT25040B-MAHL-T trades endurance for marginally lower unit cost - making the 25AA040AT-I/MC optimal for compact, high-reliability designs.
Availability
25AA040AT-I/MC is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering requiring stable component supply across extended product lifecycles.
Supply support for 25AA040AT-I/MC 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 Inc. is a leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The 25AA040A family was designed specifically for low-voltage, high-reliability serial data storage in resource-constrained embedded systems - emphasizing SPI interoperability, extended temperature operation, and robust data integrity under harsh electrical conditions.
FAQ
What is the maximum clock frequency supported by the 25AA040AT-I/MC?
The 25AA040AT-I/MC supports up to 10 MHz SPI clock frequency when VCC is 4.5 V to 5.5 V. At 2.5 V ≤ VCC < 4.5 V, max clock drops to 5 MHz; at 1.8 V ≤ VCC < 2.5 V, it is limited to 3 MHz. These thresholds ensure reliable setup/hold timing across voltage ranges per DS21827H Table 1-2.
Does the 25AA040AT-I/MC require external pull-up resistors on its SPI lines?
No external pull-ups are required for normal operation of the 25AA040AT-I/MC. All inputs (CS, SI, SCK, HOLD, WP) have internal weak pull-ups enabled only when VCC is present, and SO is actively driven or tri-stated - eliminating need for external biasing in most MCU-connected configurations.
How does the WP pin interact with the STATUS register write protection bits in the 25AA040AT-I/MC?
In the 25AA040AT-I/MC, the WP pin provides hardware-level override: when WP is low, all writes to memory and STATUS register are blocked regardless of BP0/BP1 or WEL state. When WP is high, software-configurable block protection (BP0/BP1) and write-enable latch (WEL) govern access - enabling layered security.
Can the 25AA040AT-I/MC be used in a 1.8 V system without level shifting?
Yes, the 25AA040AT-I/MC is fully specified down to 1.8 V VCC and supports 1.8 V logic levels: VIH1 = 0.7×VCC (≥1.26 V), VIL1 = 0.3×VCC (≤0.54 V), ensuring reliable interface with 1.8 V MCUs without external level translators.
What happens to the write enable latch (WEL) after a successful write operation in the 25AA040AT-I/MC?
After a successful byte write, page write, or STATUS register write, the 25AA040AT-I/MC automatically resets the write enable latch (WEL = 0). This prevents unintended subsequent writes and enforces explicit re-execution of WREN before each new write sequence - a key safety feature for data integrity.
25AA040AT-I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 10 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-DFN (2x3)
25AA040AT-I/MC FAQ
1.How can I place an order for 25AA040AT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA040AT-I/MC 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 25AA040AT-I/MC reliable?
The price and inventory of 25AA040AT-I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25AA040AT-I/MC is usually 5 days.
3.What payment methods are accepted for 25AA040AT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA040AT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA040AT-I/MC?
25AA040AT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA040AT-I/MC 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 25AA040AT-I/MC?
For technical support, including 25AA040AT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA040AT-I/MC requirements.
6.How does Aetrix verify that 25AA040AT-I/MC is sourced from the original manufacturer or authorized distributors?
All 25AA040AT-I/MC 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 25AA040AT-I/MC meets industry standards.
7.What is the process for return or replacement of 25AA040AT-I/MC?
All 25AA040AT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with 25AA040AT-I/MC, 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 25AA040AT-I/MC part is unused and in its original packaging.
Return procedure for 25AA040AT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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