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Microchip Technology 25LC040AT-E/MNY
- Part No.:
- 25LC040AT-E/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
25LC040AT-E/MNY.pdf
- Description:
- IC EEPROM 4KBIT SPI 10MHZ 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,752
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Product details
Overview
25LC040AT-E/MNY from Microchip Technology Inc. is a 4 Kbit (512 × 8) SPI Serial EEPROM with 2.5–5.5 V supply, 16-byte page write capability, 5 ms max internal write cycle time, and automotive-grade temperature support (−40°C to +125°C). It integrates hardware write protection (WP pin), HOLD functionality for interrupt-safe bus suspension, and block-level array protection (none/¼/½/all).
For engineers reviewing the 25LC040AT-E/MNY datasheet, 25LC040AT-E/MNY pinout, 25LC040AT-E/MNY application, or 25LC040AT-E/MNY equivalent, this page delivers verified electrical specs, SPI timing constraints across voltage ranges, package-specific terminal mapping, endurance/reliability data, and real-world use cases in automotive control modules, industrial sensor nodes, and embedded configuration storage.
Technical Context
The 25LC040AT-E/MNY implements a standard SPI Mode 0,0 (CPOL = 0, CPHA = 0) interface with separate SI/SO lines, CS-controlled selection, and synchronous clocking on SCK rising edge (data input) and falling edge (data output). It supports sequential read, byte/page write, and status register polling via RDSR/WRSR instructions.
Its architecture includes a nonvolatile STATUS register with WIP, WEL, BP0, and BP1 bits; hardware write protection via WP pin; and HOLD pin that tri-states SO and suspends serial communication without resetting the sequence - enabling deterministic servicing of higher-priority MCU interrupts during ongoing transfers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit organization), sufficient for firmware calibration tables or device configuration profiles. |
| Interface | SPI-compatible serial bus (Mode 0,0), requiring only CS, SCK, SI, SO, WP, HOLD, VCC, VSS - minimal GPIO footprint. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5 V; enables fast read/write throughput up to 1.25 MB/s theoretical burst rate. |
| Write Cycle Time | ≤5 ms per byte or page; deterministic latency critical for time-constrained automotive diagnostics and logging. |
| Endurance & Retention | 1,000,000 erase/write cycles and >200 years data retention - validated for lifetime operation in unattended systems. |
| Operating Temp | −40°C to +125°C (Automotive E grade), qualified for under-hood and powertrain control unit deployment. |
| Supply Voltage | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level-shifting. |
Pinout & Package
25LC040AT-E/MNY is packaged in an 8-lead TDFN (Thin Dual Flat No-lead) with 2 mm × 3 mm body and exposed thermal pad (connected to VSS or left floating per design). Pin 1 is laser-marked; pin numbering follows standard counter-clockwise layout from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: drives device into active mode; rising edge initiates internal write cycle after valid command. |
| SO | Serial Data Output | Tri-state open-drain output; data shifted out MSb-first on SCK falling edge during READ operations. |
| WP | Write-Protect Pin | Hardware lock: low disables all writes (array and STATUS register); overrides WEL state regardless of latch setting. |
| VSS | Ground Reference | Primary return path for all I/O and core logic; exposed pad must be connected to PCB ground plane for thermal stability. |
| SI | Serial Data Input | CMOS input latching instruction/address/data on SCK rising edge; supports daisy-chaining via shared SCK/CS lines. |
| SCK | Serial Clock Input | Synchronous timing reference; rise/fall times ≤100 ns required for reliable operation at 10 MHz. |
| HOLD | Hold Input | Pauses ongoing SPI transfer when pulled low (SCK must be low first); resumes from exact point on release. |
| VCC | Supply Voltage | 2.5–5.5 V power rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Mode | Up to 16 bytes written atomically within one physical page (00h–0Fh, 10h–1Fh, etc.), reducing host CPU overhead vs. byte-by-byte writes. |
| Block Write Protection | Configurable via STATUS register (BP1/BP0): protects none, upper 1/4 (180h–1FFh), upper 1/2 (100h–1FFh), or entire array (000h–1FFh). |
| Power-On Write Protection | Automatic WEL reset at power-up and after every successful write, preventing accidental corruption during brown-out or reset events. |
| HOLD Functionality | Enables deterministic interruption handling: MCU services high-priority ISR while preserving full SPI transaction context without re-synchronization. |
| ESD Robustness | ≥4 kV HBM rating on all pins - meets AEC-Q100 stress test requirements for automotive electronics reliability. |
Applications
| Engine Control Unit (ECU) Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing fuel map coefficients, sensor offset corrections, and adaptive learning values updated infrequently but requiring guaranteed retention over 15+ years. IC Role / Device Role / Timing Role: Nonvolatile configuration store interfaced directly to PIC® MCU SPI port; accessed during boot and diagnostic modes. Use Value: 1M endurance and >200-year data retention ensure calibration integrity across vehicle lifetime without backup battery or refresh logic. |
Use Scenario: Holding user-defined I/O mapping, PID tuning parameters, and alarm thresholds in modular automation controllers deployed in harsh factory environments. IC Role / Device Role / Timing Role: SPI-configurable memory accessed by ARM Cortex-M7 during initialization and runtime parameter updates. Use Value: −40°C to +125°C operation and 4 kV ESD rating guarantee reliable read/write under wide ambient swings and EMI-rich conditions. |
| Smart Sensor Node Identity & Trim Data | Medical Device Usage Log Storage |
Use Scenario: Storing unique device ID, factory calibration trim codes, and self-test results in MEMS pressure sensors used in HVAC and industrial monitoring. IC Role / Device Role / Timing Role: Low-power serial EEPROM sharing SPI bus with ADC and transceiver; accessed only during power-on or firmware update. Use Value: 5 µA standby current and 16-byte page write minimize energy per configuration access - critical for battery-powered nodes. |
Use Scenario: Recording timestamped usage events, error codes, and maintenance intervals in portable diagnostic equipment requiring audit-trail compliance. IC Role / Device Role / Timing Role: Secure, tamper-resistant log storage with hardware WP pin enabled during normal operation to prevent accidental overwrite. Use Value: Hardware write protection (WP pin) + STATUS register BP bits provide dual-layer defense against unintended log corruption. |
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/MNY | Wider VCC range (1.8–5.5 V); Industrial temp (−40°C to +85°C); same pinout and instruction set. | Lacks automotive qualification; unsuitable for under-hood or powertrain applications requiring E-grade reliability. | Select when operating below 2.5 V or in non-automotive industrial settings where extended voltage flexibility outweighs temperature grade. |
| AT25040B-MAHL-T | Same 4 Kbit SPI EEPROM; 1.8–5.5 V; Industrial temp; different manufacturer (Microchip acquired Atmel EEPROM line). | Minor AC timing variations (e.g., tWC = 5 ms typical vs. 5 ms max); identical functional behavior and pin compatibility. | Valid drop-in alternative if 25LC040AT-E/MNY is unavailable; verify tCSS/tCSH setup/hold margins in high-speed designs. |
Compared with 25AA040AT-I/MNY, the 25LC040AT-E/MNY provides automotive-grade temperature assurance and tighter 2.5 V minimum VCC, while AT25040B-MAHL-T offers identical function with minor timing tolerances - making it suitable for legacy design reuse where sourcing continuity is prioritized.
Availability
25LC040AT-E/MNY is available at Aetrix Electronics and suitable for automotive control units, industrial programmable logic controllers, and medical diagnostic devices requiring stable component supply across extended product lifecycles.
Supply support for 25LC040AT-E/MNY 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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The 25LC040A family was designed specifically for automotive and industrial applications demanding high reliability, extended temperature operation, and robust SPI EEPROM functionality in space-constrained PCB layouts.
FAQ
What is the maximum clock frequency supported by the 25LC040AT-E/MNY across its full voltage range?
The 25LC040AT-E/MNY supports up to 10 MHz at VCC ≥ 4.5 V, 5 MHz at 2.5 V ≤ VCC < 4.5 V, and is not rated for operation below 2.5 V. These limits are defined in Table 1-2 AC Characteristics and apply across the full −40°C to +125°C automotive temperature range. Exceeding these frequencies may result in timing violations and data corruption.
Does the 25LC040AT-E/MNY require external pull-up resistors on its SO or SI lines?
No - the 25LC040AT-E/MNY SO pin is internally driven and does not require an external pull-up; SI is a CMOS input with no pull-up requirement. However, CS, WP, and HOLD should be externally pulled high (typically 10 kΩ to VCC) to ensure defined logic states during power-up and idle periods, as specified in Microchip's application guidance for SPI EEPROMs.
How does the HOLD function interact with an ongoing write cycle in the 25LC040AT-E/MNY?
The HOLD pin has no effect on an active internal write cycle (tWC); once initiated by CS rising edge, the 5 ms write completes regardless of HOLD state. HOLD only suspends serial communication (READ/WRITE/RDSR commands) - it cannot pause or abort an in-progress erase/write operation already executing in the EEPROM array.
Can the 25LC040AT-E/MNY be used with a 1.8 V microcontroller SPI interface?
No - the 25LC040AT-E/MNY requires a minimum VCC of 2.5 V and is not specified for 1.8 V operation. For 1.8 V systems, the 25AA040A variant (1.8–5.5 V, Industrial grade) is the appropriate Microchip part. Using 25LC040AT-E/MNY below 2.5 V violates Absolute Maximum Ratings and risks unreliable read/write behavior.
What is the purpose of the exposed thermal pad on the 25LC040AT-E/MNY TDFN package?
The exposed pad on the 25LC040AT-E/MNY TDFN package serves as a thermal and electrical connection point. Per Microchip's packaging specification, it must be soldered to a PCB copper pour tied to VSS to ensure proper heat dissipation and signal integrity. Leaving it floating or unconnected degrades thermal performance and may cause timing margin violations under sustained write load.
25LC040AT-E/MNY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-WFDFN 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x3)
25LC040AT-E/MNY FAQ
1.How can I place an order for 25LC040AT-E/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC040AT-E/MNY 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 25LC040AT-E/MNY reliable?
The price and inventory of 25LC040AT-E/MNY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25LC040AT-E/MNY is usually 5 days.
3.What payment methods are accepted for 25LC040AT-E/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC040AT-E/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC040AT-E/MNY?
25LC040AT-E/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC040AT-E/MNY 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 25LC040AT-E/MNY?
For technical support, including 25LC040AT-E/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC040AT-E/MNY requirements.
6.How does Aetrix verify that 25LC040AT-E/MNY is sourced from the original manufacturer or authorized distributors?
All 25LC040AT-E/MNY 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 25LC040AT-E/MNY meets industry standards.
7.What is the process for return or replacement of 25LC040AT-E/MNY?
All 25LC040AT-E/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 25LC040AT-E/MNY, 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 25LC040AT-E/MNY part is unused and in its original packaging.
Return procedure for 25LC040AT-E/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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