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Microchip Technology 24LC1025T-E/SN
- Part No.:
- 24LC1025T-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24LC1025T-E/SN.pdf
- Description:
- IC EEPROM 1MBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:21,949
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Product details
Overview
24LC1025T-E/SN from Microchip Technology Inc. is a 128K × 8 (1024 kbit) I²C-compatible serial EEPROM with hardware write-protection, 128-byte page buffer, and industrial/automotive temperature support (–40°C to +125°C). It operates from 2.5V to 5.5V, supports up to 400 kHz clock frequency, and delivers ≤450 µA read current and ≤5 µA standby current. Used for nonvolatile parameter storage in automotive control modules and industrial sensor nodes.
For engineers reviewing the 24LC1025T-E/SN datasheet, 24LC1025T-E/SN pinout, 24LC1025T-E/SN application, or 24LC1025T-E/SN equivalent, key selection criteria include VCC range compatibility (2.5–5.5 V), A2 pin hardwiring requirement, WP-controlled write protection, 128-byte page write capability, and automotive-grade temperature operation (–40°C to +125°C).
Technical Context
The 24LC1025T-E/SN implements a two-wire I²C interface with Schmitt-trigger inputs on SDA and SCL for noise immunity, and slope-controlled outputs to suppress ground bounce. Its internal address counter supports contiguous reads within 512 kbit segments (00000h–0FFFFh and 10000h–1FFFFh), with block select bit B0 enabling access across both halves.
Write operations are self-timed: byte writes complete in ≤5 ms, page writes (up to 128 bytes) also require ≤5 ms. The device uses an internal high-voltage generator for EEPROM programming and includes hardware write-protection via the WP pin-tied to VCC to inhibit all writes while permitting reads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 128K × 8 (1024 kbit) - provides sufficient nonvolatile storage for firmware configuration, calibration data, and event logs in embedded controllers. |
| VCC operating range | 2.5 V to 5.5 V - compatible with standard 3.3 V and 5 V logic rails without level-shifting. |
| Max clock frequency | 400 kHz at VCC ≥ 2.5 V (E-temp) - enables fast parameter updates while maintaining robustness in noisy automotive environments. |
| Page write buffer | 128 bytes - reduces I²C transaction count for bulk data writes, improving system-level throughput and reducing bus arbitration overhead. |
| Endurance | 1 million erase/write cycles per page - supports frequent recalibration or logging in industrial monitoring applications. |
| Data retention | 200 years at +25°C - ensures long-term reliability of stored settings without periodic refresh. |
| Temperature range | –40°C to +125°C (Automotive E-grade) - qualified for under-hood and powertrain control unit deployment. |
| Write-protect method | Hardware WP pin - prevents accidental overwrites during power transients or firmware glitches without software intervention. |
Pinout & Package
24LC1025T-E/SN is housed in an 8-lead SOIC package (3.90 mm wide), RoHS-compliant and Pb-free, with standard JEDEC SOIC footprint and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | User-configurable chip address input | Allows up to four devices on one I²C bus; must be hard-wired to VSS or VCC to set slave address bits. |
| A1 | User-configurable chip address input | Second chip-select bit; combined with A0, defines unique 2-bit address for multi-device configurations. |
| A2 | Non-configurable chip address input | Must be tied to VCC; floating or low state disables device operation - critical for design validation and layout review. |
| VSS | Ground reference | Common return path for all internal circuitry; requires low-impedance connection to system ground plane. |
| SDA | Serial data bidirectional I/O | Open-drain output requiring external pull-up resistor (2 kΩ typical for 400 kHz); carries address, command, and data traffic. |
| SCL | Serial clock input | Master-generated clock synchronizing all I²C transfers; Schmitt-trigger input improves noise margin. |
| WP | Write-protect control input | Active-high protection: tied to VCC blocks all writes but permits unlimited reads - essential for safety-critical parameter locking. |
| VCC | Power supply | Supplies core logic and EEPROM array; must remain stable within 2.5–5.5 V during all operations including write cycles. |
Key Features
| Feature | Design Value |
|---|---|
| 128-byte page write buffer | Reduces required I²C transactions by up to 128× versus byte-write mode, minimizing bus occupancy and host CPU overhead. |
| Schmitt-trigger inputs on SDA/SCL | Provides ≥50 mV hysteresis (0.05 × VCC), rejecting sub-50 ns noise spikes common in automotive and industrial EMI environments. |
| Hardware write-protection (WP) | Eliminates need for software-based lock mechanisms, preventing corruption during brown-out, reset, or firmware faults. |
| Cascadable up to four devices | Enables 4 Mbit total EEPROM capacity on a single I²C bus using only A0/A1 address pins - simplifies memory expansion in space-constrained designs. |
| Self-timed erase/write cycle | Removes requirement for external timing control or polling delay loops; ACK polling provides deterministic completion detection. |
| ESD protection >4000 V | Meets IEC 61000-4-2 Level 4 requirements, supporting direct handling and board-level integration without additional protection circuitry. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Storing adaptive fuel trim values, fault codes, and calibration offsets that persist across ignition cycles and battery disconnects. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed write integrity during cranking voltage dips (down to 2.5 V) and ambient temperatures up to +125°C. Use Value: Enables compliance with ISO 16750-2 automotive electrical load dump and cold-cranking specifications without external supervision circuitry. | Use Scenario: Retaining I/O configuration maps, ladder logic state variables, and maintenance counters across power loss events in factory automation systems. IC Role / Device Role / Timing Role: High-reliability data logger and configuration vault interfaced via isolated I²C to microcontroller or FPGA. Use Value: Delivers 1M endurance and 200-year data retention, eliminating scheduled EEPROM replacement in 15+ year PLC deployments. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Securing drug library parameters, dosage history, and user audit trails subject to FDA 21 CFR Part 11 electronic record requirements. IC Role / Device Role / Timing Role: Tamper-resistant configuration store with hardware WP pin physically tied to secure voltage rail to prevent unauthorized reprogramming. Use Value: Meets IEC 62304 Class C software safety requirements by decoupling write-enable control from firmware execution path. | Use Scenario: Recording tariff schedules, metering registers, tamper events, and firmware update metadata in ANSI C12.22-compliant utility meters. IC Role / Device Role / Timing Role: Secure, long-life data archive operating across –25°C to +70°C outdoor enclosures with intermittent backup power. Use Value: Supports 10+ year field deployment with no field-replaceable memory, verified by accelerated retention testing per JEDEC JESD22-A117. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA1025-I/SN | Wider VCC range (1.7–5.5 V), lower max clock (100 kHz at VCC < 2.5 V), industrial temp only (–40°C to +85°C) | Suitable for battery-powered portable devices with 1.8 V operation; not rated for automotive under-hood use | Select when operating below 2.5 V or requiring extended low-voltage functionality; avoid for E-temp applications. |
| AT24C1024-SSHL-T | Same density and I²C interface; 1 MHz max clock (at 2.5–5.5 V); different pinout (A2 grounded, no hardwire-to-VCC requirement) | Supports higher-speed logging in data acquisition systems; lacks A2 hardwire constraint, easing layout but reducing fault tolerance | Choose for faster write throughput where A2 flexibility is preferred; verify WP implementation matches system security policy. |
Compared with 24LC1025T-E/SN, the 24AA1025-I/SN offers broader voltage operation but sacrifices automotive temperature rating and speed, while the AT24C1024-SSHL-T enables higher clock rates but removes the fail-safe A2-to-VCC requirement - making 24LC1025T-E/SN optimal for safety-critical, high-temperature deployments demanding deterministic hardware-enforced behavior.
Availability
24LC1025T-E/SN is available at Aetrix Electronics and suitable for automotive ECU development, industrial PLC firmware storage, and medical device configuration management requiring stable component supply across extended product lifecycles.
Supply support for 24LC1025T-E/SN 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 24LC1025T-E/SN belongs to Microchip's serial EEPROM product line, engineered specifically for automotive and industrial applications requiring high reliability, extended temperature operation, and hardware-level data integrity assurance.
FAQ
What is the required connection for the A2 pin on the 24LC1025T-E/SN?
The A2 pin on the 24LC1025T-E/SN must be hard-wired to VCC. If left floating or tied to VSS, device operation becomes undefined. This is a mandatory hardware requirement specified in the datasheet to ensure correct initialization and reliable communication on the I²C bus. Failure to tie A2 to VCC will prevent the 24LC1025T-E/SN from responding to any commands.
Does the 24LC1025T-E/SN support 1 MHz I²C clock operation?
No, the 24LC1025T-E/SN does not support 1 MHz I²C clock operation. Its maximum clock frequency is 400 kHz at VCC ≥ 2.5 V under automotive temperature conditions. The 1 MHz rating applies only to the 24FC1025 variant. Using a 1 MHz clock with the 24LC1025T-E/SN will result in communication failures and noncompliant timing per the AC characteristics table in DS20001941L.
How many devices can be cascaded on a single I²C bus using the 24LC1025T-E/SN?
Up to four 24LC1025T-E/SN devices can be cascaded on a single I²C bus using the A0 and A1 address pins. These two pins provide two configurable bits, yielding four unique slave addresses (00, 01, 10, 11). The A2 pin is non-configurable and must be tied to VCC, so it does not contribute to address variation. This allows a total system capacity of 4 Mbit (4 × 1024 kbit) without bus repeaters.
What is the page write time specification for the 24LC1025T-E/SN?
The page write time for the 24LC1025T-E/SN is ≤5 ms, as specified in the datasheet's AC characteristics table (Parameter TWC). This is the maximum time required for the internal self-timed write cycle to complete after a Stop condition is issued during a page write operation. Typical page write time is 3 ms, but system firmware must allow up to 5 ms before initiating subsequent I²C transactions or polling for acknowledgment.
Is the 24LC1025T-E/SN RoHS-compliant and Pb-free?
Yes, the 24LC1025T-E/SN is RoHS-compliant and Pb-free. The "T" suffix in the part number denotes tape-and-reel packaging, and the "SN" suffix indicates the 8-lead SOIC package with Matte Tin (Sn) finish, conforming to JEDEC standards. Package marking includes the Pb-free JEDEC designator "3e", and full compliance documentation is available in Microchip's packaging specification documents.
24LC1025T-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
24LC1025T-E/SN FAQ
1.How can I place an order for 24LC1025T-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC1025T-E/SN 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 24LC1025T-E/SN reliable?
The price and inventory of 24LC1025T-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC1025T-E/SN is usually 5 days.
3.What payment methods are accepted for 24LC1025T-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC1025T-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC1025T-E/SN?
24LC1025T-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC1025T-E/SN 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 24LC1025T-E/SN?
For technical support, including 24LC1025T-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC1025T-E/SN requirements.
6.How does Aetrix verify that 24LC1025T-E/SN is sourced from the original manufacturer or authorized distributors?
All 24LC1025T-E/SN 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 24LC1025T-E/SN meets industry standards.
7.What is the process for return or replacement of 24LC1025T-E/SN?
All 24LC1025T-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24LC1025T-E/SN, 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 24LC1025T-E/SN part is unused and in its original packaging.
Return procedure for 24LC1025T-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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