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Microchip Technology 24LC025T/ST
- Part No.:
- 24LC025T/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24LC025T/ST.pdf
- Description:
- IC EEPROM 2KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,265
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Product details
Overview
24LC025T/ST from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory, operating from 2.5V to 5.5V with 400 kHz max clock frequency and industrial/automotive temperature range (–40°C to +125°C). It features 16-byte page write buffer, 5 ms max write cycle time, and Schmitt-trigger inputs for noise immunity - used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.
For engineers reviewing the 24LC025T/ST datasheet, 24LC025T/ST pinout, 24LC025T/ST application, or 24LC025T/ST equivalent, key selection considerations include its SOT-23-6 package, absence of hardware write-protect (WP pin not connected), automotive-grade reliability, and compatibility with standard I²C master controllers requiring low-voltage operation and high endurance.
Technical Context
The 24LC025T/ST implements a two-wire I²C interface with open-drain SDA/SCL pins, internal address pointer auto-increment, and cascading support for up to four devices on one bus (SOT-23 variant). Its memory array uses CMOS floating-gate technology with self-timed erase/write cycles and built-in VCC threshold detection below 1.5V.
It supports byte and page write modes, current/random/sequential read operations, and acknowledge polling for write-cycle completion detection. The device lacks internal WP functionality - A0/A1 address pins are active, A2 is unconnected per SOT-23 pinout, and no hardware write protection is implemented.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit) - sufficient for small configuration tables, MAC addresses, or calibration coefficients in space-constrained designs. |
| Supply Voltage | 2.5V to 5.5V - compatible with 3.3V and 5V logic systems without level shifting. |
| Max Clock Frequency | 400 kHz - enables faster writes than 100 kHz legacy I²C, reducing transaction latency in real-time systems. |
| Page Write Buffer | 16 bytes - allows burst programming of related parameters (e.g., full sensor offset/gain set) in single I²C transaction. |
| Write Cycle Time | 5 ms maximum - defines minimum interval between successive write commands; impacts firmware update throughput. |
| Endurance | 1 million erase/write cycles - ensures long-term reliability in field-updatable applications like metering or industrial controls. |
| Data Retention | 200 years at 25°C - guarantees nonvolatile storage integrity over product lifetime without refresh. |
| Operating Temp | –40°C to +125°C (Automotive E-grade) - qualified for under-hood, powertrain, and motor control environments. |
Pinout & Package
24LC025T/ST is packaged in Pb-free, RoHS-compliant 6-lead SOT-23 (small outline transistor) with 1.6 mm × 2.8 mm footprint and 0.95 mm height - optimized for high-density PCB layouts in portable and automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCL) | Serial Clock Input | Master-generated clock synchronizing all I²C transfers; requires external pull-up resistor (2 kΩ typical for 400 kHz). |
| 2 (VSS) | Ground Reference | System ground return path; must be low-impedance and decoupled near device for noise immunity. |
| 3 (SDA) | Serial Data I/O | Bidirectional open-drain data line; shared among multiple I²C slaves; requires same pull-up as SCL. |
| 4 (A1) | Address Input | Second chip-select bit; sets slave address bit A1; tied to VSS or VCC to configure unique I²C address (0x50–0x57). |
| 5 (A0) | Address Input | First chip-select bit; sets slave address bit A0; enables up to four 24LC025T/ST devices on same bus. |
| 6 (VCC) | Power Supply | +2.5V to +5.5V supply input; requires local 0.1 μF ceramic decoupling capacitor placed within 2 mm. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | Enables robust operation on noisy automotive or industrial buses by rejecting sub-50 ns spikes and ensuring clean signal thresholds. |
| Output slope control | Prevents ground bounce during SDA transitions, eliminating false Start/Stop conditions in high-speed or multi-load I²C systems. |
| 16-byte page write buffer | Reduces host MCU I²C overhead by allowing up to 16 related bytes (e.g., full calibration vector) to be written in one Stop-initiated transaction. |
| No WP pin connection | Eliminates external write-protection circuitry - simplifies design but requires software-controlled write enable for secure updates. |
| 1 μA standby current (typ.) | Supports battery-powered applications (e.g., smart sensors) with multi-year operation on coin cells or energy-harvesting sources. |
| Factory programming option | Allows pre-loading of unique identifiers (e.g., MAC, serial number) during manufacturing - reduces post-silicon programming steps. |
Applications
| Industrial Sensor Calibration | Automotive ECU Configuration |
|---|---|
|
Use Scenario: Storing factory-trimmed offset, gain, and temperature coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during power-on initialization via I²C; retains values across cold starts and brownouts. Use Value: Eliminates need for external trimming components and enables field recalibration without hardware modification. |
Use Scenario: Holding vehicle-specific configuration data (e.g., transmission shift maps, lighting profiles) in body control modules. IC Role / Device Role / Timing Role: Automotive-grade EEPROM interfacing with microcontroller's I²C peripheral during boot or diagnostic mode. Use Value: Ensures reliable data persistence over 15+ year vehicle life and 125°C under-hood thermal cycling. |
| IoT Edge Device Identity | Medical Instrument Settings |
|
Use Scenario: Securing unique device identity (e.g., IEEE EUI-48 MAC address, cryptographic keys) in battery-powered wireless nodes. IC Role / Device Role / Timing Role: Low-power I²C slave storing immutable identity tokens read once at startup and cached in RAM. Use Value: Enables zero-touch provisioning and secure boot while consuming <1 μA in standby - extending coin-cell life beyond 10 years. |
Use Scenario: Preserving user-adjusted therapy parameters (e.g., infusion rate, alarm thresholds) in portable drug pumps and monitors. IC Role / Device Role / Timing Role: Medical-grade nonvolatile memory retaining critical settings through power loss, sterilization cycles, and battery swaps. Use Value: Meets IEC 62304 safety requirements for data integrity and supports audit trails via write-cycle logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC025-I/ST | Same die, industrial-grade (–40°C to +85°C); identical pinout, timing, and electrical specs except temp range. | Not qualified for automotive under-hood use; suitable for commercial/industrial control panels and consumer appliances. | Select when automotive qualification is unnecessary and cost optimization is prioritized. |
| AT24C02-SSHM-T | 2 Kbit I²C EEPROM from Microchip (formerly Atmel); 1.7V–5.5V supply, 400 kHz, SOIC-8 package; includes WP pin. | Requires PCB layout change (8-pin vs. 6-pin); adds hardware write-protect capability absent in 24LC025T/ST. | Choose if board redesign is feasible and hardware-level write protection is required for security-critical updates. |
Compared with 24LC025-I/ST, the 24LC025T/ST offers extended temperature operation essential for automotive deployment, while AT24C02-SSHM-T provides pin-compatible write protection at the cost of larger footprint and different package - making 24LC025T/ST optimal for space-constrained, high-temp embedded nodes needing minimal external components.
Availability
24LC025T/ST is available at Aetrix Electronics and suitable for automotive ECU configuration, industrial sensor calibration, and medical instrument settings requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 24LC025T/ST 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 devices, and memory solutions, serving automotive, industrial, and communications markets with high-reliability silicon and development tools.
The 24LC025T/ST belongs to Microchip's 24XX025 family of serial EEPROMs designed specifically for automotive and industrial applications demanding extended temperature operation, high endurance, and compact packaging.
FAQ
What is the operating voltage range for the 24LC025T/ST?
The 24LC025T/ST operates from 2.5V to 5.5V - this range ensures compatibility with both 3.3V and 5V microcontroller I²C interfaces without level-shifting circuitry. Operation below 2.5V is not supported, unlike the 24AA025 variant which starts at 1.7V. The 24LC025T/ST maintains full I²C timing compliance and data integrity across this entire voltage window.
Does the 24LC025T/ST have a hardware write-protect pin?
No, the 24LC025T/ST does not implement hardware write protection. Per the datasheet, the WP pin is not internally connected on any 24XX025 device, including the 24LC025T/ST. Write protection must be enforced in firmware via command sequencing or access control - a key distinction from 24LC024/24AA024 variants that include functional WP pin logic.
What package type is used for the 24LC025T/ST?
The 24LC025T/ST uses a 6-lead SOT-23 package (1.6 mm × 2.8 mm, 0.95 mm height), confirmed by Microchip's Device Selection Table and Package Marking Information. This compact, surface-mount package supports high-density PCB layouts and automated assembly - distinct from the 8-lead PDIP, SOIC, TSSOP, DFN, and MSOP packages offered for other members of the 24XX025 family.
How many devices can be connected on the same I²C bus using the 24LC025T/ST?
Up to four 24LC025T/ST devices can share one I²C bus, enabled by the A0 and A1 address pins (A2 is unconnected in SOT-23). These two pins generate four unique slave addresses (0x50–0x53), allowing contiguous 8K-bit addressing. This differs from 8-pin variants supporting eight devices via A0/A1/A2 - a direct consequence of the SOT-23 pin count limitation.
What is the maximum write cycle time for the 24LC025T/ST?
The 24LC025T/ST has a maximum write cycle time of 5 ms for both byte and page writes, as specified in Table 1-2 of DS21210N. This value is fixed and independent of supply voltage or temperature - meaning firmware must enforce at least 5 ms delay (or use acknowledge polling) before initiating subsequent writes to avoid data corruption or bus lockup.
24LC025T/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
24LC025T/ST FAQ
1.How can I place an order for 24LC025T/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC025T/ST 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 24LC025T/ST reliable?
The price and inventory of 24LC025T/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC025T/ST is usually 5 days.
3.What payment methods are accepted for 24LC025T/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC025T/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC025T/ST?
24LC025T/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC025T/ST 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 24LC025T/ST?
For technical support, including 24LC025T/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC025T/ST requirements.
6.How does Aetrix verify that 24LC025T/ST is sourced from the original manufacturer or authorized distributors?
All 24LC025T/ST 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 24LC025T/ST meets industry standards.
7.What is the process for return or replacement of 24LC025T/ST?
All 24LC025T/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24LC025T/ST, 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 24LC025T/ST part is unused and in its original packaging.
Return procedure for 24LC025T/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24LC025T/ST Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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