24LC256-E/MS Microchip Integrated Circuit (Small Outline Packages) In Stock
Microchip 24LC256-E/MS is a 256 Kbit (32 KB) I2C serial EEPROM in an 8-pin MSOP package, featuring up to 1,000,000 write/erase cycles and 200-year data retention, operating at up to 400 kHz for non-volatile data storage in embedded systems.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- 24LC256-E/MS Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.9918(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 256 Kbit (32 KB) I2C EEPROM capacity with up to 1,000,000 write/erase endurance cycles for high-reliability non-volatile storage
- 400 kHz I2C fast-mode operation enables rapid configuration and data writes in microcontroller-based embedded designs
- 200-year minimum data retention ensures long-term parameter and calibration storage without data loss over the product's service lifetime
- Compact 8-pin MSOP package reduces PCB footprint for space-constrained portable instruments, wearables, and IoT devices
Applications
The 24LC256-E/MS is widely used in embedded systems for storing calibration parameters, user configuration settings, firmware revision data, and event logs that must persist through power cycles. Its I2C interface and compact MSOP-8 package make it a natural fit for microcontroller platforms such as PIC, AVR, and ARM Cortex-M in consumer electronics, industrial sensors, medical devices, and smart metering equipment.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | MSOP-8 |
| Factory Lead Time | 11Weeks |
| YTEOL | 9 |
| Clock Frequency-Max (fCLK) | 0.4MHz |
| Data Retention Time-Min | 200 |
| Endurance | 1000000 Write/Erase Cycles |
| I2C Control Byte | 1010DDDR |
| JESD-30 Code | S-PDSO-G8 |
| JESD-609 Code | e3 |
| Memory Density | 262144bit |
| Memory IC Type | EEPROM |
| Memory Width | 8 |
| Number of Functions | 1 |
| Number of Ports | 1 |
| Number of Words | 32768words |
| Number of Words Code | 32000 |
| Operating Mode | SYNCHRONOUS |
| Organization | 32KX8 |
| Output Characteristics | OPEN-DRAIN |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.19 |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE |
| Parallel/Serial | SERIAL |
| Peak Reflow Temperature (Cel) | 260 |
| Programming Voltage | 4.5V |
| Qualification Status | Not Qualified |
| Reverse Pinout | NO |
| Screening Level | AEC-Q100 |
| Serial Bus Type | I2C |
| Standby Current-Max | 0.000005A |
| Supply Current-Max | 0.003mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 2.5V |
| Supply Voltage-Nom (Vsup) | 4.5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Write Cycle Time-Max (tWC) | 5ms |
| Write Protection | HARDWARE |
| Package | Small Outline Packages |
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
Compatible alternatives and drop-in replacements for 24LC256-E/MS:
Frequently Asked Questions
How many write/erase cycles does the 24LC256-E/MS support, and what does that mean for an application that updates settings daily?
The 24LC256-E/MS supports a minimum of 1,000,000 write/erase cycles per byte location. For an application that updates a configuration byte once per day, this endurance rating translates to over 2,700 years of daily writes before wear-out, making the device effectively unlimited in lifespan for typical embedded parameter storage use cases.
What is the maximum I2C clock speed of the 24LC256-E/MS, and how does that affect data transfer time for a full 32 KB write?
The 24LC256-E/MS supports a maximum I2C clock frequency of 400 kHz in fast mode. At 400 kHz with a typical 64-byte page write sequence and accounting for acknowledge and address overhead, writing the full 32 KB capacity would require approximately 500 ms to 1 second, which is acceptable for one-time provisioning or firmware parameter updates but should be factored into boot initialization timing budgets.
How long can the 24LC256-E/MS retain data without power, and which long-life applications benefit from that rating?
Microchip specifies a minimum data retention time of 200 years for the 24LC256-E/MS at room temperature, making it suitable for applications requiring permanent or semi-permanent storage of calibration coefficients, serial numbers, or security keys. Industries such as medical device manufacturing, industrial metrology, and utility smart metering rely on this long retention rating to ensure product traceability data survives the entire equipment service life.
Can multiple 24LC256-E/MS devices share the same I2C bus, and how is address collision avoided?
Yes, up to 8 24LC256-E/MS devices can share the same 2-wire I2C bus simultaneously by setting the 3 hardware address pins (A0, A1, A2) to unique combinations using pull-up or pull-down resistors. The I2C control byte uses the pattern 1010DDDR, where DDD encodes the 3-bit device address, allowing up to 8 devices on a single bus for a combined addressable capacity of 256 KB across all devices.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.2100 | $1.21 |
| 5+ | $1.1122 | $5.56 |
| 100+ | $1.0600 | $106.00 |
| 1000+ | $1.0100 | $1010.00 |
| 1200+ | $1.0089 | $1210.68 |
| 2400+ | $0.9918 | $2380.39 |
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