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Microchip Technology 25C040-I/SN
- Part No.:
- 25C040-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25C040-I/SN.pdf
- Description:
- IC EEPROM 4KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,534
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Product details
Overview
25C040-I/SN from Microchip Technology Inc. is a 4 Kbit (512 × 8) SPI-compatible serial EEPROM designed for nonvolatile data storage in automotive and industrial control systems. It operates at 4.5–5.5 V, supports up to 3 MHz clock frequency, features 16-byte page write capability, and delivers 1 million write cycles with >200 years data retention. Its HOLD and WP pins enable robust system-level control during interrupts or critical firmware updates.
For engineers reviewing the 25C040-I/SN datasheet, 25C040-I/SN pinout, 25C040-I/SN application, or 25C040-I/SN equivalent, this page provides verified electrical specs, automotive-grade temperature operation (−40°C to +125°C), package-confirmed SOIC-8 pin mapping, and two validated alternative parts for design continuity and supply resilience.
Technical Context
The 25C040-I/SN implements a standard SPI Mode 0,0 interface with separate SI (data in) and SO (data out) lines, requiring only CS, SCK, SI, SO, HOLD, and WP for full functionality. Its internal architecture includes an 8-bit instruction register, auto-incrementing address pointer for sequential reads, and hardware-controlled write protection via both WP pin and STATUS register BP0/BP1 bits.
It uses self-timed erase/write cycles with 5 ms max internal write time, supports block protection of none/¼/½/all memory array, and integrates power-on write-disable logic, write-enable latch reset on WRDI/WRSR/POWER-UP, and high-impedance tri-state outputs during HOLD or CS high. All operations are fully compatible with PIC and other SPI-capable microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit organization), sufficient for calibration tables, device IDs, or small firmware patches |
| Supply voltage | 4.5–5.5 V - matches standard 5 V automotive and industrial bus rails without level shifting |
| Max clock frequency | 3 MHz at VCC = 4.5–5.5 V - enables fast configuration loading in real-time control loops |
| Write endurance | 1 million cycles - supports frequent logging or parameter tuning in field-deployed equipment |
| Data retention | >200 years at +25°C - ensures long-term reliability in unattended infrastructure applications |
| Operating temperature | −40°C to +125°C (Automotive E grade) - qualified for under-hood and powertrain ECUs |
| Page size | 16 bytes - constrains burst writes to aligned boundaries; requires software management across page boundaries |
Pinout & Package
25C040-I/SN is packaged in an 8-pin SOIC (SN) with 150-mil body width, JEDEC MS-012 compliant, Pb-free matte tin finish, and standard surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select input | Active-low enable; places device in Standby when high; initiates internal write cycle on low-to-high transition after valid write sequence |
| SO (Pin 2) | Serial Output | Tri-state open-drain output; shifts data out on falling edge of SCK; high-impedance when CS high or HOLD active |
| WP (Pin 3) | Write-Protect input | Hardware lock: disables all writes to memory and STATUS register when low; overrides WREN latch state |
| VSS (Pin 4) | Ground reference | Primary return path for all I/O and core logic; must be low-impedance connection to system GND plane |
| SI (Pin 5) | Serial Input | Latches instruction, address, and data on rising edge of SCK; accepts MSB-first SPI framing |
| SCK (Pin 6) | Serial Clock input | Synchronizes all data transfers; rising edge clocks SI, falling edge updates SO; max 3 MHz at 4.5–5.5 V |
| HOLD (Pin 7) | Communication suspend | Pauses ongoing SPI transaction without resetting state; SO goes high-Z; resumes from same point when released low→high with SCK low |
| VCC (Pin 8) | Power supply | 4.5–5.5 V nominal; powers EEPROM core, I/O buffers, and charge pump; bypass capacitor required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade temperature range | Qualified for −40°C to +125°C operation - suitable for engine control units, transmission modules, and ADAS sensors |
| Hardware write protection | Dual-layer protection: dedicated WP pin + nonvolatile BP0/BP1 bits in STATUS register - prevents accidental overwrites during power transients or firmware faults |
| Low-power standby current | 500 nA typical - enables battery-backed systems (e.g., telematics, smart meters) to retain memory for years without recharge |
| Page write capability | 16-byte page buffer allows efficient bulk writes within same 16-byte boundary - reduces SPI transaction overhead vs. byte-by-byte writes |
| HOLD function | Enables host MCU to service higher-priority interrupts mid-transaction without losing context - eliminates need for retransmission or state tracking |
Applications
| Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing fuel map coefficients, sensor calibration offsets, and fault code history in automotive powertrain controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration and diagnostic data storage with guaranteed write integrity during ignition cycling and load dump events. Use Value: Automotive temperature rating and hardware WP pin ensure reliable operation in harsh under-hood environments without external supervision. |
Use Scenario: Retaining user-defined I/O mapping, ladder logic parameters, and communication settings across power cycles in programmable logic controllers. IC Role / Device Role / Timing Role: Persistent parameter storage accessible via SPI from main controller; supports field updates without firmware reflashing. Use Value: 1 M endurance and >200-year retention guarantee long service life in factory automation systems with infrequent but critical writes. |
| Smart Energy Meter | Medical Diagnostic Equipment |
Use Scenario: Logging energy consumption data, tariff schedules, and tamper-detection timestamps in utility-grade electricity meters. IC Role / Device Role / Timing Role: Secure, low-power data logger interfaced to metrology SoC; WP pin prevents unauthorized configuration changes. Use Value: 500 nA standby current extends battery backup duration; 16-byte page writes optimize SPI bandwidth during high-frequency logging bursts. |
Use Scenario: Storing device-specific calibration constants, usage counters, and regulatory compliance logs in portable ultrasound or ECG units. IC Role / Device Role / Timing Role: Trusted nonvolatile storage for safety-critical parameters; HOLD pin allows uninterrupted data capture during real-time signal processing. Use Value: Automotive qualification ensures stability during sterilization cycles and extended shelf life; SPI compatibility simplifies integration with ARM-based medical SoCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA040-I/SN | 1.8–5.5 V supply, 1 MHz max clock, −40°C to +85°C industrial grade | Broader VCC range enables single-BOM use across 3.3 V and 5 V systems; lower speed limits high-throughput logging | Select when multi-voltage compatibility or cost-sensitive industrial designs outweigh automotive temp requirement |
| 25LC040-I/SN | 2.5–5.5 V supply, 2 MHz max clock, −40°C to +85°C industrial grade | Intermediate voltage and speed; lacks automotive qualification but offers better noise immunity than 25AA040 at 3.3 V | Choose for 3.3 V embedded systems needing faster access than 25AA040 but no AEC-Q100 compliance |
Compared with 25C040-I/SN, 25AA040-I/SN supports wider voltage range and lower power, while 25LC040-I/SN balances speed and 3.3 V compatibility - neither matches the +125°C automotive qualification or 3 MHz performance of the 25C040-I/SN.
Availability
25C040-I/SN is available at Aetrix Electronics and suitable for automotive ECU development, industrial PLC configuration storage, and smart meter data logging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 25C040-I/SN 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, and memory solutions, with deep expertise in embedded control and nonvolatile storage technologies.
The 25C040 belongs to Microchip's legacy SPI Serial EEPROM product line, engineered specifically for automotive and high-reliability industrial applications demanding extended temperature operation and robust data integrity.
FAQ
What is the maximum clock frequency supported by the 25C040-I/SN?
The 25C040-I/SN supports a maximum clock frequency of 3 MHz when operating within its specified VCC range of 4.5–5.5 V. This timing is validated across the full automotive temperature range (−40°C to +125°C) and enables high-speed configuration reads and page writes in time-critical applications such as engine control and real-time diagnostics.
Does the 25C040-I/SN support hardware write protection?
Yes, the 25C040-I/SN includes dedicated hardware write protection via the WP (Write-Protect) pin. When WP is held low, all writes to both the memory array and STATUS register are disabled - even if the internal write-enable latch is set. This feature provides fail-safe protection against unintended writes during power-up, brown-out, or software faults.
What package type is used for the 25C040-I/SN part number?
The "/SN" suffix in 25C040-I/SN explicitly denotes the 8-pin SOIC (Small Outline Integrated Circuit) package with 150-mil body width, JEDEC MS-012 compliant, and Pb-free matte tin finish. Pin 1 is marked with a notch or dot, and the pinout follows the standard SOIC-8 layout confirmed in Microchip DS21204E.
How many write cycles can the 25C040-I/SN endure before failure?
The 25C040-I/SN is rated for 1 million write/erase cycles per memory location, as specified in Microchip's DS21204E datasheet. This endurance is guaranteed across the full automotive temperature range and supports long-term field deployment in applications requiring frequent parameter updates, such as adaptive learning algorithms or event logging.
Is the 25C040-I/SN suitable for automotive applications?
Yes, the "E" temperature grade in 25C040-I/SN confirms qualification for automotive applications, with operational specification from −40°C to +125°C. It meets requirements for under-hood and powertrain modules, and its hardware write protection, HOLD functionality, and 1 M endurance make it appropriate for ASIL-B supporting systems where data integrity is critical.
25C040-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25C040-I/SN FAQ
1.How can I place an order for 25C040-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25C040-I/SN 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 25C040-I/SN reliable?
The price and inventory of 25C040-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25C040-I/SN is usually 5 days.
3.What payment methods are accepted for 25C040-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25C040-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25C040-I/SN?
25C040-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25C040-I/SN 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 25C040-I/SN?
For technical support, including 25C040-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25C040-I/SN requirements.
6.How does Aetrix verify that 25C040-I/SN is sourced from the original manufacturer or authorized distributors?
All 25C040-I/SN 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 25C040-I/SN meets industry standards.
7.What is the process for return or replacement of 25C040-I/SN?
All 25C040-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25C040-I/SN, 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 25C040-I/SN part is unused and in its original packaging.
Return procedure for 25C040-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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