25LC040A-I/P Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
Microchip 25LC040A-I/P is a 4-Kbit (512-byte) SPI serial EEPROM with up to 10 MHz clock speed, 2.5 V to 5.5 V supply, and 200-year data retention in an 8-pin PDIP package. It supports 1,000,000 write/erase cycles with an 80 ns read access time and hardware write-protect pin. Available from stock worldwide for non-volatile configuration storage in embedded and industrial designs.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- 25LC040A-I/P Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4621(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4-Kbit (512-byte) SPI EEPROM with up to 10 MHz clock, providing fast read access at 80 ns and compatible with 3.3 V and 5 V microcontroller SPI buses
- 1,000,000 write/erase endurance cycles with 200-year data retention for reliable non-volatile parameter and calibration storage
- Hardware write-protect pin and SPI chip-select addressing support up to 8 devices on a single bus with individual protection control
Applications
The 25LC040A-I/P is used to store non-volatile configuration parameters, calibration coefficients, and device serial numbers in industrial sensors, motor drives, and IoT node firmware. Its low 2.5 V minimum supply and 8-pin DIP footprint make it a convenient add-on memory for any microcontroller with SPI, enabling persistent settings storage without a full Flash erase cycle on the host MCU.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | PDIP-8 |
| Factory Lead Time | 8Weeks |
| YTEOL | 8 |
| Clock Frequency-Max (fCLK) | 10MHz |
| Data Retention Time-Min | 200 |
| Endurance | 1000000 Write/Erase Cycles |
| JESD-30 Code | R-PDIP-T8 |
| JESD-609 Code | e3 |
| Memory Density | 4096bit |
| Memory IC Type | EEPROM |
| Memory Width | 8 |
| Number of Functions | 1 |
| Number of Ports | 1 |
| Number of Words | 512words |
| Number of Words Code | 512 |
| Operating Mode | SYNCHRONOUS |
| Organization | 512X8 |
| Output Characteristics | 3-STATE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Parallel/Serial | SERIAL |
| Programming Voltage | 5V |
| Qualification Status | Not Qualified |
| Serial Bus Type | SPI |
| Standby Current-Max | 0.000001A |
| Supply Current-Max | 0.005mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 2.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Write Cycle Time-Max (tWC) | 5ms |
| Write Protection | HARDWARE/SOFTWARE |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.32.00.51 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How much data storage does 25LC040A-I/P provide and how does it connect to a microcontroller?
The 25LC040A-I/P provides 4,096 bits (512 bytes) of EEPROM storage organized as 256 pages of 2 bytes each, accessible via a standard 4-wire SPI interface (SCK, SI, SO, CS). The SPI bus operates at up to 10 MHz, completing a full 512-byte sequential read in approximately 410 µs. Up to 8 devices can share one SPI bus by wiring separate chip-select lines, providing up to 4 Kbytes of total SPI EEPROM from a single bus.
How does the 1,000,000 write cycle endurance of 25LC040A-I/P affect calibration data storage in an industrial sensor?
With 1,000,000 write/erase cycles per memory location and a 200-year data retention specification, the 25LC040A-I/P can update a calibration coefficient once per second for over 11 days continuously, or once per hour for over 114 years. For typical industrial sensors that update calibration once per power cycle (perhaps daily), the 1,000,000-cycle endurance effectively guarantees lifetime operation without wear-out, making additional wear-levelling firmware unnecessary.
What is the minimum supply voltage for 25LC040A-I/P and does it support 3.3 V microcontroller I/O levels?
The 25LC040A-I/P operates from 2.5 V to 5.5 V supply, making it directly compatible with 3.3 V microcontroller systems without level shifters. SPI input logic high threshold is 0.8 × VCC, so at 3.3 V supply the logic high threshold is 2.64 V — fully compatible with a 3.3 V MCU driving the device. The device also operates from 5 V for legacy TTL/CMOS systems, eliminating the need for two EEPROM variants across a product family.
How does 25LC040A-I/P compare to 25LC040-I/P for designs requiring faster clock speeds?
The 25LC040A-I/P ('A' suffix) supports a maximum SPI clock of 10 MHz versus 3 MHz for the standard 25LC040-I/P, making it over 3x faster for burst sequential reads. Both devices share the same 4-Kbit capacity, 8-pin PDIP footprint, 2.5 V to 5.5 V supply, and 1,000,000 write cycle endurance. For designs already using 10 MHz SPI buses to communicate with sensors or displays, the 25LC040A-I/P operates at full bus speed, reducing EEPROM read time from 1.37 ms to 410 µs per full device read.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.7000 | $0.70 |
| 9+ | $0.6468 | $5.82 |
| 25+ | $0.5978 | $14.95 |
| 120+ | $0.5860 | $70.32 |
| 240+ | $0.4688 | $112.52 |
| 480+ | $0.4621 | $221.79 |
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