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Microchip Technology 24LC1025-E/SN16KVAO
- Part No.:
- 24LC1025-E/SN16KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24LC1025-E/SN16KVAO.pdf
- Description:
- IC EEPROM 1MBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,196
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Product details
Overview
24LC1025-E/SN16KVAO from Microchip Technology Inc. is a 1024 Kbit (128K × 8) I²C-compatible serial EEPROM with automotive-grade temperature range (–40°C to +125°C), 2.5V–5.5V supply, and 400 kHz max clock frequency. It features 128-byte page write buffer, hardware write-protection via WP pin, Schmitt-trigger inputs for noise immunity, and >1 million erase/write cycles. Used in automotive control modules for storing calibration data, fault logs, and configuration parameters.
For engineers reviewing the 24LC1025-E/SN16KVAO datasheet, 24LC1025-E/SN16KVAO pinout, 24LC1025-E/SN16KVAO application, or 24LC1025-E/SN16KVAO equivalent, key selection criteria include VCC operating range (2.5–5.5 V), E-temp qualification, I²C bus timing compliance at 400 kHz under automotive conditions, and cascading support for up to four devices on one bus.
Technical Context
The 24LC1025-E/SN16KVAO implements a two-wire I²C interface with slave-only operation, supporting standard-mode (100 kHz) and fast-mode (400 kHz) signaling depending on VCC level and temperature grade. Its internal architecture includes dual 512 Kbit memory blocks accessed via block-select bit (B0), enabling contiguous addressing across segments but requiring explicit block switching.
It uses an on-chip high-voltage generator for EEPROM programming, supports byte and page write modes with self-timed erase/write cycles (typ. 3 ms), and incorporates input filtering (50 ns spike suppression) and output slope control to minimize ground bounce. The A2 pin is hardwired to VCC for device enable-floating or low states result in undefined operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1024 Kbit (128K × 8), split into two 512 Kbit addressable blocks |
| Interface | I²C-compatible 2-wire serial bus, supports 100 kHz (VCC < 4.5 V) and 400 kHz (VCC ≥ 2.5 V, E-temp) |
| VCC range | 2.5 V to 5.5 V - defines minimum system rail compatibility for automotive microcontrollers |
| Temperature grade | Automotive (E): –40°C to +125°C - qualified per AEC-Q100 stress test requirements |
| Write endurance | 1,000,000 cycles per page - enables long-term logging in vehicle subsystems |
| Data retention | 200 years at +85°C - ensures firmware/config integrity over full vehicle lifecycle |
| Page write buffer | 128 bytes - reduces I²C transaction count for bulk updates and improves write throughput |
Pinout & Package
24LC1025-E/SN16KVAO is supplied in an 8-lead SOIC package (3.90 mm width), RoHS-compliant and Pb-free, with standard JEDEC MS-012AC footprint and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip select input | User-configurable address bit; sets LSB of 2-bit device address for multi-device bus sharing |
| A1 | Chip select input | User-configurable address bit; sets MSB of 2-bit device address (up to four devices supported) |
| A2 | Non-configurable chip enable | Must be tied to VCC; floating or grounded disables device operation |
| VSS | Ground reference | System common return path; decoupling capacitor required near pin |
| SDA | Bidirectional data line | Open-drain I²C data terminal requiring external pull-up (2 kΩ typical for 400 kHz) |
| SCL | Clock input | Master-generated I²C clock; Schmitt-trigger input ensures noise immunity |
| WP | Hardware write-protect | High = full array write-inhibited; sampled at Stop condition; no effect if toggled mid-cycle |
| VCC | Power supply | 2.5–5.5 V operation; powers internal HV generator and logic; bypass capacitor mandatory |
Key Features
| Feature | Design Value |
|---|---|
| Automotive temperature qualification | Rated for –40°C to +125°C operation, meeting AEC-Q100 reliability requirements for engine control units and ADAS modules |
| Hardware write protection | WP pin disables all write operations when pulled high, preventing accidental firmware corruption during power transitions |
| 128-byte page write buffer | Enables single I²C transaction to program up to 128 bytes, reducing bus overhead and improving update efficiency in telematics systems |
| Schmitt-trigger inputs | Provides 0.05×VCC hysteresis on SDA/SCL, rejecting noise spikes up to 50 ns and ensuring robust communication in electrically noisy vehicle environments |
| Cascadable architecture | Supports up to four 24LC1025 devices on one I²C bus using A0/A1 address bits, enabling scalable memory expansion without additional buses |
Applications
| Engine Control Unit (ECU) Calibration Storage | Advanced Driver Assistance Systems (ADAS) Fault Logging |
|---|---|
Use Scenario: Storing sensor calibration coefficients, fuel map tables, and emission tuning parameters that must persist across ignition cycles and survive battery disconnect. IC Role / Device Role / Timing Role: Nonvolatile configuration storage element interfaced via I²C to main MCU; accessed during boot and runtime reconfiguration. Use Value: Automotive-grade temperature range and 200-year data retention ensure parameter integrity over 15+ year vehicle service life without refresh. | Use Scenario: Recording timestamped camera/LiDAR fault events, sensor drift diagnostics, and system health metrics for regulatory reporting and predictive maintenance. IC Role / Device Role / Timing Role: Dedicated event logger with hardware write-protect enabled during normal operation to prevent overwrite of critical incident records. Use Value: 1M write cycles and 128-byte page buffering allow high-frequency logging without premature wear-out or bus contention. |
| Infotainment System User Profile Storage | Body Control Module (BCM) Configuration Memory |
Use Scenario: Retaining user preferences (seat position, climate settings, audio presets) across power-down and software updates in premium vehicle infotainment head units. IC Role / Device Role / Timing Role: I²C slave EEPROM providing persistent storage independent of main SoC flash, accessible during early boot before OS initialization. Use Value: Low standby current (5 µA) minimizes parasitic drain on vehicle battery during extended parking periods. | Use Scenario: Holding door lock logic, lighting sequences, window auto-up/down thresholds, and regional feature enablement flags in centralized BCMs. IC Role / Device Role / Timing Role: Configurable memory mapped via I²C to MCU firmware; updated only during dealer programming or OTA configuration pushes. Use Value: Hardware WP pin prevents unauthorized or erroneous writes during field service, ensuring functional safety compliance. |
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 | Industrial temp grade (–40°C to +85°C); 1.7–5.5 V VCC range; supports 100 kHz at VCC < 2.5 V | Not qualified for under-hood or powertrain use; suitable for cabin electronics only | Select when cost-sensitive industrial designs require wider voltage range but not automotive qualification |
| AT24C1024-MAHM-T | Same density and I²C interface; 1.7–5.5 V; industrial temp; 1 MHz capable; different pinout (TSSOP8) | Lacks A2 pin requirement and automotive qualification; higher speed but no E-temp validation | Choose for space-constrained PCBs needing TSSOP8 and faster 1 MHz operation where automotive reliability is not mandated |
Compared with 24LC1025-E/SN16KVAO, the 24AA1025-I/SN offers broader voltage flexibility but lacks automotive qualification, while the AT24C1024-MAHM-T provides higher clock speed and smaller footprint but no AEC-Q100 validation or A2-enforced enable logic-making 24LC1025-E/SN16KVAO the sole choice for safety-critical automotive memory where guaranteed E-temp operation and deterministic enable behavior are required.
Availability
24LC1025-E/SN16KVAO is available at Aetrix Electronics and suitable for automotive control units, ADAS loggers, and infotainment profile storage requiring stable component supply across extended production lifecycles.
Supply support for 24LC1025-E/SN16KVAO 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, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.
The 24LC1025 belongs to Microchip's automotive-qualified serial EEPROM product line, designed specifically for nonvolatile data storage in harsh-temperature vehicle subsystems where long-term data integrity and I²C interoperability are essential.
FAQ
What is the maximum I²C clock frequency supported by the 24LC1025-E/SN16KVAO under automotive operating conditions?
The 24LC1025-E/SN16KVAO supports up to 400 kHz I²C clock frequency when VCC is 2.5 V or higher and ambient temperature is within the automotive range (–40°C to +125°C). At VCC < 4.5 V under E-temp conditions, the maximum clock is limited to 100 kHz per Microchip DS20001941L specification. This ensures timing margin compliance in electrically noisy vehicle environments.
Why must the A2 pin of the 24LC1025-E/SN16KVAO be tied to VCC?
The A2 pin on the 24LC1025-E/SN16KVAO is a non-configurable chip enable input that must be hard-wired to VCC for proper device operation. If left floating or connected to VSS, the device enters an undefined state and will not respond to I²C commands. This design enforces deterministic enable behavior critical for automotive functional safety requirements.
How does hardware write-protection work on the 24LC1025-E/SN16KVAO?
Hardware write-protection on the 24LC1025-E/SN16KVAO is controlled by the WP pin: when tied to VCC, all write operations (byte and page) are inhibited while read operations remain fully functional. The WP state is sampled at the Stop condition of each write command; toggling WP mid-cycle has no effect. This prevents accidental overwrites during power-up/down or firmware updates.
Can the 24LC1025-E/SN16KVAO be used in systems powered by 1.8 V rails?
No, the 24LC1025-E/SN16KVAO requires a minimum VCC of 2.5 V and is not rated for 1.8 V operation. For 1.8 V–5.5 V compatibility, Microchip's 24FC1025 variant is specified-but it lacks automotive temperature qualification. Using 24LC1025-E/SN16KVAO below 2.5 V risks unreliable communication and failed write cycles.
What is the purpose of the block select bit (B0) in the 24LC1025-E/SN16KVAO control byte?
The block select bit (B0) in the 24LC1025-E/SN16KVAO control byte selects between two 512 Kbit memory segments (00000h–0FFFFh and 10000h–1FFFFh). It acts as address bit A16 and must be set explicitly in software to access the upper half of the 1024 Kbit array. Sequential reads cannot cross this boundary without reissuing the control byte with updated B0.
24LC1025-E/SN16KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
24LC1025-E/SN16KVAO FAQ
1.How can I place an order for 24LC1025-E/SN16KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC1025-E/SN16KVAO 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 24LC1025-E/SN16KVAO reliable?
The price and inventory of 24LC1025-E/SN16KVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC1025-E/SN16KVAO is usually 5 days.
3.What payment methods are accepted for 24LC1025-E/SN16KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC1025-E/SN16KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC1025-E/SN16KVAO?
24LC1025-E/SN16KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC1025-E/SN16KVAO 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 24LC1025-E/SN16KVAO?
For technical support, including 24LC1025-E/SN16KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC1025-E/SN16KVAO requirements.
6.How does Aetrix verify that 24LC1025-E/SN16KVAO is sourced from the original manufacturer or authorized distributors?
All 24LC1025-E/SN16KVAO 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 24LC1025-E/SN16KVAO meets industry standards.
7.What is the process for return or replacement of 24LC1025-E/SN16KVAO?
All 24LC1025-E/SN16KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 24LC1025-E/SN16KVAO, 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 24LC1025-E/SN16KVAO part is unused and in its original packaging.
Return procedure for 24LC1025-E/SN16KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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