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Microchip Technology 24LC128-I/SM
- Part No.:
- 24LC128-I/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
24LC128-I/SM.pdf
- Description:
- IC EEPROM 128KBIT I2C 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,100
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Product details
Overview
24LC128-I/SM from Microchip Technology Inc. is a 128 Kbit (16K × 8) I²C-compatible serial EEPROM designed for nonvolatile data storage in low-power embedded systems. It operates from 2.5V to 5.5V, supports up to 400 kHz clock frequency, features hardware write-protection via the WP pin, and delivers 1 million erase/write cycles with >200 years data retention. It is used in industrial sensor calibration, power meter configuration, and firmware parameter storage.
For engineers reviewing the 24LC128-I/SM datasheet, 24LC128-I/SM pinout, 24LC128-I/SM application, or 24LC128-I/SM equivalent, this page provides verified electrical specs, package mapping to 8-lead SOIC (SM), I²C timing compliance details, and validated alternative parts for design continuity and supply resilience.
Technical Context
The 24LC128-I/SM implements a two-wire I²C interface with Schmitt-trigger inputs on SDA and SCL for noise immunity, slope-controlled outputs to suppress ground bounce, and cascading support for up to eight devices on one bus using A0–A2 address pins. Its internal architecture includes a 64-byte page write buffer, self-timed erase/write cycle, and an address pointer that auto-increments during sequential reads.
It uses CMOS EEPROM technology with a dedicated high-voltage generator for programming, supports both random and sequential read modes across the full 128K boundary, and samples the WP pin at the Stop bit to enable or disable writes - no write operation occurs if WP = VCC, even when addressed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.5V to 5.5V - defines minimum system supply voltage; incompatible with sub-2.5V logic domains. |
| Max Clock Frequency | 400 kHz - sets maximum I²C bus speed; limits throughput to ~40 KB/s in page-write mode. |
| Memory Size | 128 Kbit (16K × 8) - provides 16,384 bytes of byte-addressable nonvolatile storage. |
| Page Write Buffer | 64 bytes - enables efficient bulk writes; crossing physical page boundaries causes wraparound, not auto-advance. |
| Write Cycle Time | 5 ms max - determines worst-case blocking time for host MCU during write operations. |
| Endurance | 1,000,000 cycles - specifies guaranteed erase/write cycles per memory location before wear-out. |
| Data Retention | >200 years - ensures long-term data integrity without refresh under industrial temperature conditions. |
Pinout & Package
24LC128-I/SM is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with narrow body (3.90 mm), JEDEC MO-153 compliant, marked "I/SM" indicating Industrial temperature grade and SOIC package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip Address Input | LSB of 3-bit slave address; hardwired to VSS or VCC to configure device address on shared I²C bus. |
| A1 | Chip Address Input | Middle bit of slave address; enables up to eight devices on same bus (two for MSOP). |
| A2 | Chip Address Input | MSB of slave address; combined with A0/A1, selects one of eight possible I²C addresses (1010xx0). |
| VSS | Ground Reference | Primary return path for all internal circuitry and I/O; must be low-impedance connection. |
| SDA | Serial Data I/O | Open-drain bidirectional bus line; requires external pull-up resistor (2 kΩ typical for 400 kHz). |
| SCL | Serial Clock Input | Master-generated clock signal; synchronizes all data transfers; Schmitt-trigger input improves noise margin. |
| WP | Hardware Write-Protect | Active-high enable: tied to VCC disables all writes; sampled only at Stop condition edge. |
| VCC | Power Supply | Single 2.5–5.5V supply; powers EEPROM array, control logic, and I/O buffers. |
Key Features
| Feature | Design Value |
|---|---|
| Industrial Temperature Range | –40°C to +85°C - qualified for deployment in factory automation, energy meters, and outdoor IoT nodes. |
| I²C Bus Compatibility | Fully compliant with standard-mode (100 kHz) and fast-mode (400 kHz) I²C protocol - interoperable with PIC, ARM, and ESP32 hosts. |
| Page Write Capability | 64-byte buffer allows burst writes without repeated address overhead - reduces I²C transaction count by up to 64× vs. byte writes. |
| ESD Protection | >4,000V HBM - enhances robustness in handling-sensitive industrial assembly and field service environments. |
| Low Standby Current | 1 µA max at I-temp - enables battery-backed applications like smart utility meters with multi-year shelf life. |
Applications
| Smart Energy Metering | Industrial Sensor Calibration |
|---|---|
|
Use Scenario: Storing tariff tables, billing history, and firmware update flags in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with infrequent writes and frequent reads; retains settings across power loss. Use Value: Enables regulatory-compliant data logging with >200-year retention and 1M-cycle endurance for lifetime field updates. |
Use Scenario: Saving factory-calibrated offset/gain coefficients for analog sensor front-ends in PLC I/O modules. IC Role / Device Role / Timing Role: Persistent parameter storage accessed at boot; written once during production test. Use Value: Eliminates need for external calibration trimmers; supports automated calibration workflows with traceable EEPROM writes. |
| Medical Device Configuration | Automotive Body Control Module |
|
Use Scenario: Holding user preferences, alarm thresholds, and device ID in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, low-power storage for HIPAA-compliant operational parameters; WP pin prevents accidental overwrite. Use Value: Meets IEC 62304 software safety requirements via hardware write-lock and deterministic 5 ms write latency. |
Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in automotive BCMs. IC Role / Device Role / Timing Role: EEPROM-based NVM for driver-customizable settings; accessed over vehicle I²C backbone. Use Value: Qualified to AEC-Q100 Grade 2 (–40°C to +105°C); supports 12V system integration via level-shifted I²C interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA128-I/SM | Wider VCC range (1.7–5.5V); supports 100 kHz at 1.7V; identical pinout and command set. | Better suited for mixed-voltage systems (e.g., 1.8V microcontrollers with 3.3V peripherals). | Select when operating below 2.5V or requiring extended low-voltage compatibility. |
| AT24C128-10PU-2.7 | Same 128 Kbit density, 2.7–5.5V VCC, 400 kHz max, but lacks AEC-Q100 qualification and has 500k endurance. | Lower cost option for commercial-grade applications where automotive qualification is unnecessary. | Choose for cost-sensitive consumer electronics where industrial temp and AEC-Q100 are not required. |
Compared with 24LC128-I/SM, 24AA128-I/SM extends low-voltage operation down to 1.7V while maintaining identical packaging and timing; AT24C128-10PU-2.7 offers lower cost but reduced endurance and no automotive qualification - making it unsuitable for mission-critical industrial deployments.
Availability
24LC128-I/SM is available at Aetrix Electronics and suitable for industrial sensor calibration, smart energy metering, and automotive body control module designs requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for 24LC128-I/SM 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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The 24LC128 belongs to Microchip's 24XX128 family of I²C serial EEPROMs, engineered for reliable, low-power nonvolatile storage in industrial, automotive, and communications equipment where data integrity and long-term retention are critical.
FAQ
What is the operating voltage range for the 24LC128-I/SM?
The 24LC128-I/SM operates from 2.5V to 5.5V. It is not functional below 2.5V - unlike the 24AA128 variant, which supports down to 1.7V. This voltage range ensures compatibility with standard 3.3V and 5V logic systems while excluding ultra-low-voltage applications.
Does the 24LC128-I/SM support page write operations, and what is the buffer size?
Yes, the 24LC128-I/SM supports page write operations with a 64-byte internal buffer. This allows up to 64 bytes to be loaded into the buffer and written to memory in a single self-timed cycle, reducing I²C transaction overhead compared to byte-wise writes.
How does the Write-Protect (WP) pin function on the 24LC128-I/SM?
The WP pin on the 24LC128-I/SM is sampled at the Stop condition of each write command. When tied to VCC, all write operations (byte and page) are inhibited while read operations remain fully functional - providing hardware-level protection against accidental or malicious overwrites.
What is the maximum I²C clock frequency supported by the 24LC128-I/SM?
The 24LC128-I/SM supports up to 400 kHz I²C clock frequency under VCC ≥ 2.5V. At voltages below 2.5V, it defaults to 100 kHz - though the 24LC128-I/SM is not rated for operation below 2.5V, so 400 kHz is its effective maximum.
Is the 24LC128-I/SM qualified for automotive applications?
No, the 24LC128-I/SM is rated for Industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive use, Microchip offers the 24LC128-E/SM (Extended temp, –40°C to +125°C) or AEC-Q100-qualified variants such as the 24LC128-IMF.
24LC128-I/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 128Kbit
- Memory Organization:
- 16K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIJ
24LC128-I/SM FAQ
1.How can I place an order for 24LC128-I/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC128-I/SM 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 24LC128-I/SM reliable?
The price and inventory of 24LC128-I/SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC128-I/SM is usually 5 days.
3.What payment methods are accepted for 24LC128-I/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC128-I/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC128-I/SM?
24LC128-I/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC128-I/SM 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 24LC128-I/SM?
For technical support, including 24LC128-I/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC128-I/SM requirements.
6.How does Aetrix verify that 24LC128-I/SM is sourced from the original manufacturer or authorized distributors?
All 24LC128-I/SM 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 24LC128-I/SM meets industry standards.
7.What is the process for return or replacement of 24LC128-I/SM?
All 24LC128-I/SM units undergo pre-shipment inspection (PSI). If there is an issue with 24LC128-I/SM, 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 24LC128-I/SM part is unused and in its original packaging.
Return procedure for 24LC128-I/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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