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Microchip Technology AT25040A-10PI-2.7
- Part No.:
- AT25040A-10PI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25040A-10PI-2.7.pdf
- Description:
- IC EEPROM 4KBIT SPI 20MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,524
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Product details
Overview
AT25040A-10PI-2.7 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-used for configuration storage in industrial controllers and embedded sensor nodes.
For engineers reviewing the AT25040A-10PI-2.7 datasheet, AT25040A-10PI-2.7 pinout, AT25040A-10PI-2.7 application, or AT25040A-10PI-2.7 equivalent, key selection criteria include VCC range compatibility (2.7–5.5V), 8-lead PDIP package footprint, SPI Mode 0/3 support, 1M write endurance, and block-level write protection via status register BP0/BP1 bits.
Technical Context
The AT25040A-10PI-2.7 implements a synchronous SPI slave interface with dedicated SI/SO pins, CS-controlled selection, and HOLD pin for communication suspension without sequence reset. It uses an 8-bit instruction register with MSB-first transmission and supports op-codes for READ, WRITE, WREN, WRDI, RDSR, and WRSR.
Internal architecture includes a 512×8 memory array, status register with RDY/WEN/BP1/BP0 bits, data register, address decoder, and clock generator. Write cycles are self-timed (≤5 ms), require prior WREN instruction, and support 8-byte page writes with automatic address increment within the page boundary.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8), sufficient for firmware parameter sets or calibration tables in resource-constrained systems |
| Supply Voltage Range | 2.7V to 5.5V - enables direct interfacing with 3.3V and 5V microcontrollers without level shifting |
| Max Clock Frequency | 20 MHz at VCC = 5.0V - supports high-throughput configuration loading in real-time systems |
| Write Endurance | 1 million cycles - ensures reliable field updates over product lifetime in programmable logic controllers |
| Data Retention | 100 years at 25°C - guarantees long-term integrity of stored calibration or security keys |
| Page Write Size | 8 bytes - minimizes write latency per transaction while avoiding excessive overwrites in sequential logging |
| Operating Temperature | −40°C to +85°C - qualified for industrial automation and automotive under-hood auxiliary modules |
Pinout & Package
AT25040A-10PI-2.7 is supplied in an 8-lead PDIP (0.300" wide) package, compatible with through-hole prototyping and legacy industrial PCBs. Pin 1 is marked by a notch or dot; package dimensions conform to JEDEC MS-001, Variation BA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: drives device into active state only when low; SO enters high-Z when CS high |
| SCK | Serial Clock | Input-only master-generated clock; timing defines SPI Mode 0 (CPOL=0, CPHA=0) or Mode 3 (CPOL=1, CPHA=1) |
| SI | Serial Data Input | Receives op-code, address, and data; ignored during HOLD or when CS is high |
| SO | Serial Data Output | Tri-state output delivering read data or status register contents; high-Z when CS high or during HOLD |
| GND | Ground Reference | Signal and power return path; must be low-impedance to ensure noise immunity on SPI lines |
| VCC | Power Supply | Single supply input (2.7–5.5V); decoupling capacitor required near pin for stable read/write operation |
| WP | Write Protect | Hardware lock: pulls low to inhibit all write instructions regardless of WREN status or status register settings |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting internal address counter; requires SCK low to assert/deassert |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 and 3 compatibility | Interoperates with 68HC11, PIC, ARM Cortex-M, and other common MCU families without protocol translation |
| Block write protection (1/4, 1/2, full array) | Configurable via nonvolatile BP0/BP1 bits in status register-prevents accidental overwrite of critical boot or security sectors |
| Self-timed write cycle (≤5 ms) | Eliminates need for external delay timers or polling overhead; RDSR bit 0 indicates completion |
| Dual write protection (WP pin + WREN/WRDI) | Hardware lock (WP) and software lock (WREN disable) provide layered defense against unintended writes |
| HOLD pin for multi-master arbitration | Allows host MCU to yield bus temporarily-essential in shared-SPI systems with multiple peripherals |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in modular PLC backplanes where firmware updates occur infrequently but configuration changes are routine. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via SPI during power-up or reconfiguration events; operates at ≤10 MHz for deterministic timing. Use Value: Enables field-serviceable parameter tuning without firmware reflashing; 1M endurance supports >10 years of weekly calibration adjustments. |
Use Scenario: Retaining sensor offset/gain coefficients and patient-specific therapy parameters in portable infusion pumps and ECG monitors. IC Role / Device Role / Timing Role: Secure, low-power data vault accessed during device initialization; WP pin hardwired to prevent runtime corruption during battery swaps. Use Value: Meets IEC 62304 Class B requirements for data integrity; 100-year retention ensures lifetime accuracy without recalibration. |
| Automotive Body Control Module (BCM) | Smart Energy Meter Firmware Parameters |
Use Scenario: Holding door lock logic states, mirror position presets, and lighting profiles in BCMs exposed to −40°C to +85°C ambient. IC Role / Device Role / Timing Role: SPI-connected configuration store synchronized to MCU's low-speed peripheral clock; HOLD used during CAN interrupt servicing. Use Value: Automotive-grade qualification ensures reliability across thermal cycling; 2.7V min VCC supports operation during cold-crank battery dips. |
Use Scenario: Storing tariff schedules, metering constants, and tamper-detection flags in ANSI C12.20-compliant smart meters deployed in utility substations. IC Role / Device Role / Timing Role: Isolated SPI slave storing regulatory-mandated values; WRSR-configured full-array protection prevents unauthorized parameter modification. Use Value: Block-level write protection satisfies ANSI C12.22 security requirements; 8-lead PDIP simplifies replacement in field-repair scenarios. |
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, 1.8–5.5V supply, 20 MHz max, same 8-lead SOIC package but not PDIP-compatible | Lacks HOLD pin; uses different status register layout (no BP1/BP0); no automotive temp grade | Select if SOIC footprint preferred and HOLD functionality not required; verify WRSR compatibility with existing firmware |
| BR24G04FJ-WE2 | 4-kbit I²C EEPROM, 1.7–5.5V, 1 MHz max, 8-lead TSSOP; no SPI interface or HOLD pin | I²C bus contention handling differs; no hardware WP pin-relies on software lock only | Choose only when migrating from SPI to I²C architecture; requires MCU firmware rewrite and board layout change |
Compared with M95040-DRMN3TP/K and BR24G04FJ-WE2, AT25040A-10PI-2.7 uniquely combines PDIP packaging, HOLD pin support, automotive temperature range, and SPI Mode 0/3 flexibility-making it optimal for legacy industrial designs requiring drop-in replaceability and robust bus arbitration.
Availability
AT25040A-10PI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, automotive body control modules, and smart energy meters requiring stable component supply across extended lifecycle programs.
Supply support for AT25040A-10PI-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 support for legacy Atmel memory products, including manufacturing, documentation, and technical assistance.
The AT25040A series belongs to Microchip's industrial-grade serial EEPROM portfolio, designed specifically for reliable nonvolatile storage in harsh environments where voltage tolerance, endurance, and interface simplicity are critical.
FAQ
What is the maximum clock frequency supported by AT25040A-10PI-2.7?
The AT25040A-10PI-2.7 supports up to 20 MHz SCK frequency when VCC = 5.0V. At 2.7V, the maximum rated frequency is 10 MHz per AC characteristics table. Exceeding these limits may cause read/write failures or timing violations in the SPI interface.
Does AT25040A-10PI-2.7 support SPI Mode 3 (CPOL=1, CPHA=1)?
Yes, AT25040A-10PI-2.7 explicitly supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as confirmed in the Features section. The device functions as a slave with separate SI/SO pins and MSB-first data transfer in either mode.
How does the HOLD pin function during an active write cycle in AT25040A-10PI-2.7?
The HOLD pin has no effect during an internal write cycle (tWC = 5 ms). Once initiated, the write proceeds to completion regardless of HOLD state. HOLD only suspends serial communication during read or instruction phases-not during active programming.
Can AT25040A-10PI-2.7 be used with a 1.8V microcontroller system?
No - AT25040A-10PI-2.7 is the 2.7V variant (VCC = 2.7–5.5V). For 1.8V systems, use AT25040A-10PI-1.8 instead. Using the -2.7 version below 2.7V violates absolute maximum ratings and risks unreliable operation or data corruption.
What happens if the WP pin is pulled low mid-write on AT25040A-10PI-2.7?
If WP is pulled low after CS goes low but before the internal write cycle starts, the write instruction is ignored and the device returns to standby. If the internal write cycle has already begun (after CS high), pulling WP low has no effect-the write completes normally.
Is the AT25040A-10PI-2.7 pinout compatible with other AT25xxx family members in PDIP packages?
Yes - all AT25010A/020A/040A variants in 8-lead PDIP (e.g., AT25010A-10PI-2.7, AT25020A-10PI-2.7) share identical pinout: CS/SO/WP/GND/VCC/HOLD/SCK/SI in that order. Memory size differences do not affect physical or electrical interface compatibility.
AT25040A-10PI-2.7 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:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25040A-10PI-2.7 FAQ
1.How can I place an order for AT25040A-10PI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040A-10PI-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-10PI-2.7 reliable?
The price and inventory of AT25040A-10PI-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-10PI-2.7 is usually 5 days.
3.What payment methods are accepted for AT25040A-10PI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040A-10PI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040A-10PI-2.7?
AT25040A-10PI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040A-10PI-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-10PI-2.7?
For technical support, including AT25040A-10PI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040A-10PI-2.7 requirements.
6.How does Aetrix verify that AT25040A-10PI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25040A-10PI-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-10PI-2.7 meets industry standards.
7.What is the process for return or replacement of AT25040A-10PI-2.7?
All AT25040A-10PI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25040A-10PI-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-10PI-2.7 part is unused and in its original packaging.
Return procedure for AT25040A-10PI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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