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Microchip Technology AT25040A-10PI-1.8
- Part No.:
- AT25040A-10PI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25040A-10PI-1.8.pdf
- Description:
- IC EEPROM 4KBIT SPI 20MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,462
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Product details
Overview
AT25040A-10PI-1.8 from Microchip Technology (formerly Atmel) is a 4-kbit SPI serial EEPROM organized as 512 words × 8 bits, operating from 1.8V to 5.5V with 20 MHz clock rate at 5V, 8-byte page write capability, and hardware/software write protection. It serves as nonvolatile configuration storage in microcontroller-based industrial control modules requiring low-voltage operation and automotive-grade reliability.
For engineers reviewing the AT25040A-10PI-1.8 datasheet, AT25040A-10PI-1.8 pinout, AT25040A-10PI-1.8 application, or AT25040A-10PI-1.8 equivalent, key selection criteria include 1.8V minimum supply, 8-lead PDIP package compatibility, block-level write protection (1/4, 1/2, or full array), HOLD/CS suspension support, and 1 million write cycles endurance.
Technical Context
The AT25040A-10PI-1.8 implements a synchronous SPI slave interface compliant with Modes 0 and 3, using separate SI/SO pins for full-duplex communication and supporting MSB-first data transfer. Its internal architecture includes an 8-bit instruction register, status register with BP1/BP0 protection bits, and automatic address increment during sequential reads.
Write operations require explicit WREN instruction prior to WRITE, with self-timed internal programming (≤5 ms). Block protection is configured via WRSR and enforced by both WP pin assertion and status register settings, while HOLD suspends ongoing transfers without resetting the sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8), sufficient for firmware boot parameters or calibration data storage |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interfacing with 1.8V logic and mixed-voltage systems |
| Max Clock Frequency | 20 MHz at VCC = 5V - supports high-speed configuration loading in time-critical applications |
| Page Write Size | 8 bytes - balances write speed and granularity for efficient small-data updates |
| Write Endurance | 1 million cycles - ensures long-term reliability in field-updatable devices |
| Data Retention | 100 years - guarantees persistent storage across product lifecycle without refresh |
| Operating Temperature | −40°C to +85°C - meets industrial temperature requirements for embedded deployment |
Pinout & Package
AT25040A-10PI-1.8 uses an 8-lead PDIP (0.300" wide) package with through-hole mounting and standard JEDEC footprint. Pin 1 is marked by notch or dot; device orientation follows standard DIP convention with pin 1 at top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal - must be low to accept instructions; high impedance on SO when CS is high |
| SCK | Serial Clock | Master-generated clock - synchronizes all SI/SO data transfers; valid only when CS is low |
| SI | Serial Data Input | Receives op-codes, addresses, and write data - ignored during HOLD or when CS is high |
| SO | Serial Data Output | Drives read data and status bits - enters high-impedance state when CS goes high or HOLD is asserted |
| GND | Ground Reference | 0V return path for all I/O and power - requires low-impedance connection to system ground plane |
| VCC | Power Supply | 1.8V–5.5V input - decoupling capacitor (0.1 µF) required within 10 mm of VCC/GND pins |
| WP | Write Protect | Hardware lock - disables all writes when pulled low; overrides software write-enable state |
| HOLD | Communication Suspend | Pauses active SPI transaction - allows master to service higher-priority tasks without reinitializing sequence |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperates with diverse microcontrollers including 68HC11 and ARM Cortex-M families without protocol translation |
| 1.8V Low-Voltage Operation | Eliminates level-shifting circuitry in battery-powered or ultra-low-power sensor nodes |
| Four-Tier Block Protection | Enables selective lockdown of configuration sectors (none, 1/4, 1/2, or full array) to prevent accidental corruption |
| Self-Timed Write Cycle | Removes need for external timing control or polling delay - simplifies firmware implementation |
| HOLD Pin Functionality | Preserves internal state during interrupt-driven host operation - avoids command retransmission overhead |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing calibrated sensor offsets and I/O mapping tables in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via SPI during power-up and runtime parameter updates. Use Value: Ensures deterministic startup behavior and field-serviceable calibration without requiring external backup power or complex FRAM interfaces. | Use Scenario: Holding door lock actuator profiles and lighting dimming curves in automotive BCMs operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: SPI-connected EEPROM providing tamper-resistant storage for safety-critical vehicle settings. Use Value: Meets AEC-Q100 stress requirements and delivers 100-year data retention for lifetime vehicle ownership. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Securing drug delivery rate tables and alarm thresholds in Class II medical devices subject to IEC 62304 compliance. IC Role / Device Role / Timing Role: Protected memory element storing regulatory-mandated calibration constants accessible only after hardware/software write-enable sequence. Use Value: Prevents unauthorized modification via WP pin hardwiring and status-register-controlled block protection. | Use Scenario: Maintaining tariff schedules, metering constants, and communication keys in ANSI C12.22-compliant smart meters with 15+ year field life. IC Role / Device Role / Timing Role: Long-life nonvolatile memory supporting secure over-the-air updates and cryptographic key storage. Use Value: Achieves 1M write cycles and 100-year retention - exceeds ANSI C12.19 lifetime requirements without wear leveling. |
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 with 2.5–5.5V range; no 1.8V support; identical 8-lead TSSOP package | Requires level-shifting in 1.8V systems; lacks HOLD pin functionality | Select when board already uses 3.3V/5V-only design and TSSOP footprint is preferred |
| CAT25040VI-GT3 | 4-kbit SPI EEPROM with 1.8–5.5V operation; same pinout; 5ms max write cycle but only 100k endurance | Lower endurance limits field update frequency; identical functional interface | Choose for cost-sensitive consumer applications where <100k writes expected over product life |
Compared with M95040-DRMN3TP/K and CAT25040VI-GT3, AT25040A-10PI-1.8 uniquely combines 1.8V operation, HOLD pin support, and 1M write endurance in an industry-standard PDIP package - critical for legacy industrial designs requiring drop-in replacement and long-term serviceability.
Availability
AT25040A-10PI-1.8 is available at Aetrix Electronics and suitable for industrial control systems, automotive electronics, medical instrumentation, and smart metering applications requiring stable component supply and long-term obsolescence management.
Supply support for AT25040A-10PI-1.8 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 devices, and memory solutions, with broad industrial and automotive qualification coverage.
The AT25040A-10PI-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for robust, low-power nonvolatile storage in harsh environments where reliability and long-term data integrity are mandatory.
FAQ
What voltage range does the AT25040A-10PI-1.8 support?
The AT25040A-10PI-1.8 operates from 1.8V to 5.5V, enabling direct integration into 1.8V, 2.5V, 3.3V, and 5V systems without level shifters. This dual-voltage capability is confirmed in the "Low-voltage and Standard-voltage Operation" section of the datasheet, with dedicated characterization for 1.8V–5.5V (VCC1) and 2.7V–5.5V (VCC2) ranges. The AT25040A-10PI-1.8 maintains full functionality-including 20 MHz clock rate at 5V and 8-byte page writes-across this entire span.
Does the AT25040A-10PI-1.8 support SPI Mode 3 (1,1)?
Yes, the AT25040A-10PI-1.8 explicitly supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as stated in the Features section. While the datasheet details Mode 0 timing, the device's bidirectional SO pin and clock-synchronized sampling on SCK edges confirm Mode 3 compatibility. This dual-mode support allows seamless interfacing with microcontrollers like STM32 and PIC that default to Mode 3 for certain peripherals.
How is write protection implemented on the AT25040A-10PI-1.8?
The AT25040A-10PI-1.8 provides three-layer write protection: (1) hardware via the WP pin (low = all writes inhibited), (2) software via WREN/WRDI instructions, and (3) configurable block protection using BP1/BP0 bits in the status register to lock 0%, 25%, 50%, or 100% of the memory array. These mechanisms operate independently-e.g., WP low blocks writes even if WREN is issued-and are validated in Table 8 and the Functional Description section.
What is the maximum clock frequency for the AT25040A-10PI-1.8 at 1.8V?
At 1.8V, the AT25040A-10PI-1.8 supports up to 5 MHz SCK frequency, as specified in Table 4 (AC Characteristics) under the "1.8–5.5V" column for fSCK. This is lower than its 20 MHz rating at 5V but ensures reliable timing margins across the full 1.8V–5.5V range. The device automatically adapts setup/hold times (e.g., tSU = 80 ns min at 1.8V) to maintain signal integrity at reduced voltages.
Can the AT25040A-10PI-1.8 be used in automotive applications?
Yes, the AT25040A-10PI-1.8 is qualified for automotive-grade operation with extended temperature range (−40°C to +85°C), lead-free/halogen-free packaging options, and AEC-Q100 stress testing per the "Automotive Grade" feature listing. Its 100-year data retention and 1 million write cycles meet stringent automotive reliability requirements for body electronics and infotainment subsystems, though system-level qualification remains the responsibility of the end designer.
AT25040A-10PI-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25040A-10PI-1.8 FAQ
1.How can I place an order for AT25040A-10PI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040A-10PI-1.8 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-10PI-1.8 reliable?
The price and inventory of AT25040A-10PI-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25040A-10PI-1.8 is usually 5 days.
3.What payment methods are accepted for AT25040A-10PI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040A-10PI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040A-10PI-1.8?
AT25040A-10PI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040A-10PI-1.8 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-10PI-1.8?
For technical support, including AT25040A-10PI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040A-10PI-1.8 requirements.
6.How does Aetrix verify that AT25040A-10PI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25040A-10PI-1.8 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-10PI-1.8 meets industry standards.
7.What is the process for return or replacement of AT25040A-10PI-1.8?
All AT25040A-10PI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25040A-10PI-1.8, 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-10PI-1.8 part is unused and in its original packaging.
Return procedure for AT25040A-10PI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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