24FC256-I/ST Microchip Integrated Circuit (Small Outline Packages) In Stock
Microchip 24FC256-I/ST is a 256 Kbit (32 KB) I²C serial EEPROM in an 8-pin TSSOP package with up to 1 MHz clock frequency and 1,000,000 write/erase cycle endurance. It retains data for a minimum of 200 years and operates across an extended industrial temperature range. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- 24FC256-I/ST Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4000(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
- 256 Kbit (32 KB) I²C EEPROM with up to 1 MHz fast-mode clock for high-speed serial memory access
- 1,000,000 write/erase cycle endurance with a minimum 200-year data retention for long-life embedded storage
- Compact 8-pin TSSOP package with standard I²C address control pins (1010DDDR byte) supporting up to 8 devices on one bus
Applications
The 24FC256-I/ST is used in embedded systems requiring non-volatile parameter and configuration storage, such as industrial sensors, smart meters, and medical diagnostic devices that log calibration coefficients and firmware settings. Its 32 KB capacity and 1 MHz I²C interface make it suitable for data logging applications in wearables, IoT nodes, and consumer electronics where multiple EEPROM chips must share a two-wire bus. The extended 200-year data retention ensures that stored data remains intact throughout the product lifecycle in automotive and industrial equipment.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | TSSOP-8 |
| Factory Lead Time | 9Weeks |
| YTEOL | 8 |
| Clock Frequency-Max (fCLK) | 1MHz |
| Data Retention Time-Min | 200 |
| Endurance | 1000000 Write/Erase Cycles |
| I2C Control Byte | 1010DDDR |
| JESD-30 Code | R-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 | TSSOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Parallel/Serial | SERIAL |
| Peak Reflow Temperature (Cel) | 260 |
| Programming Voltage | 2.5V |
| 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) | 1.7V |
| Supply Voltage-Nom (Vsup) | 2.5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| 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 | Mainland China, Malaysia, Philippines, Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for 24FC256-I/ST:
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Frequently Asked Questions
What is the storage capacity and maximum clock frequency of the 24FC256-I/ST?
The 24FC256-I/ST provides 256 Kbits (32 KB) of non-volatile EEPROM storage and supports I²C clock frequencies up to 1 MHz, enabling fast serial read and page-write operations. This combination of capacity and speed makes it suitable for storing firmware parameters, calibration tables, and user settings in industrial and consumer embedded systems without slowing down the host microcontroller's I²C bus.
How many write cycles does the 24FC256-I/ST endure before wear affects data reliability?
The 24FC256-I/ST is specified for a minimum of 1,000,000 write/erase cycles per page, far exceeding the typical 100,000-cycle rating of standard EEPROM devices. This 10x improvement in endurance makes it well-suited for applications with frequent updates such as event counters, usage-hour logs, and adaptive calibration storage in industrial controllers and smart energy meters that update stored values hundreds of times per day.
How many 24FC256-I/ST devices can share a single I²C bus, and how are they addressed?
Up to 8 individual 24FC256-I/ST devices can coexist on a single I²C bus by configuring the three hardware address pins (A0, A1, A2) to unique binary combinations. The I²C control byte format is 1010DDDR, where the three D bits select the target device address (0 through 7) and the R bit selects read or write mode. This allows up to 8 x 32 KB = 256 KB of total EEPROM capacity on a 2-wire bus without additional bus multiplexers.
Is the 24FC256-I/ST suitable for automotive or harsh-environment industrial designs?
The 24FC256-I/ST is specified across an extended temperature range and offers a minimum 200-year data retention, making it robust for industrial and automotive-adjacent applications such as motor drives, HVAC control units, and building automation nodes. The 8-pin TSSOP package is RoHS-compliant (Pb-free, JESD-609 e3), and the 9-week factory lead time is typical for standard industrial EEPROM restocks from major distributors.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.4000 | $0.40 |
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