25AA040AT-I/OT Microchip Integrated Circuit (SOT23 (6-Pin)) In Stock
25AA040AT-I/OT is a 4 Kbit SPI serial EEPROM by Microchip, organized as 512 x 8 bits. Key specs: 1.8 V supply, 10 MHz SPI clock, 200-year data retention in SOT-23-6 package. From $0.35, in stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- SOT23 (6-Pin)
- Pin Count
- 6
- Lifecycle
- ACTIVE
- Datasheet
- 25AA040AT-I/OT Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2400(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 x 8) SPI EEPROM with 10 MHz clock and 1.8 V minimum supply for ultra-low-voltage microcontroller systems
- 1,000,000 write/erase cycle endurance and 200-year data retention ensuring long-term reliability in industrial and consumer applications
- SOT-23-6 package with only 3 signal pins (CS, SCK, SI/SO) minimizes PCB footprint for compact, space-constrained designs
Applications
25AA040AT-I/OT is used in wearable medical devices, smart meters, and battery-powered IoT nodes that need non-volatile configuration or calibration storage at 1.8 V. Its 10 MHz SPI interface lets a host MCU read or write the full 512-byte array in under 1 ms, minimizing the time spent with the SPI bus active. The SOT-23-6 package and 200-year retention make it a reliable choice for parameter storage in industrial sensors with decade-long field lifetimes.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | SOT-23-6 |
| Factory Lead Time | 6Weeks |
| YTEOL | 8 |
| Clock Frequency-Max (fCLK) | 10MHz |
| Data Retention Time-Min | 200 |
| Endurance | 1000000 Write/Erase Cycles |
| JESD-30 Code | R-PDSO-G6 |
| 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 | TSOP6,.11,37 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, LOW PROFILE, SHRINK PITCH |
| Parallel/Serial | SERIAL |
| Peak Reflow Temperature (Cel) | 260 |
| 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) | 1.8V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Write Cycle Time-Max (tWC) | 5ms |
| Write Protection | HARDWARE/SOFTWARE |
| Package | SOT23 (6-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| 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 long can 25AA040AT-I/OT retain stored data, and how many write cycles does it support?
The 25AA040AT-I/OT is specified for a minimum data retention of 200 years and endures up to 1,000,000 write/erase cycles per byte. This combination of high endurance and long retention makes it suitable for configuration data that is written infrequently but must survive the entire product lifetime in field deployments.
At what supply voltage and SPI clock speed does 25AA040AT-I/OT operate, and why does that matter for low-power designs?
The device operates from 1.8 V to 5.5 V and supports SPI clock rates up to 10 MHz at 1.8 V. This 1.8 V minimum supply means it can share the same power rail as low-voltage MCUs like PIC16LF or MSP430 series without a level shifter, reducing bill-of-materials cost and quiescent current by eliminating voltage translation.
When is the 4 Kbit density of 25AA040AT-I/OT sufficient compared to a larger 64 Kbit EEPROM for a sensor calibration use case?
For a sensor with 8 to 16 calibration coefficients stored as 16-bit values, 4 Kbit provides 512 bytes—enough for 128 calibration words plus factory serial number and firmware version. Choosing 4 Kbit over a 64 Kbit device reduces cost by roughly 50% and keeps the SOT-23-6 footprint under 3 mm², which is important for miniaturized probes and wearable patches.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.5500 | $0.55 |
| 5+ | $0.5060 | $2.53 |
| 10+ | $0.4840 | $4.84 |
| 100+ | $0.4700 | $47.00 |
| 1000+ | $0.4500 | $450.00 |
| 3000+ | $0.2400 | $720.00 |
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