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Microchip Technology 24LC1025-E/SM
- Part No.:
- 24LC1025-E/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
24LC1025-E/SM.pdf
- Description:
- IC EEPROM 1MBIT I2C 400KHZ 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,814
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Product details
Overview
24LC1025-E/SM from Microchip Technology Inc. is a 128K × 8 (1024 kbit) I²C-compatible serial EEPROM with hardware write-protection, 128-byte page buffer, and operation across 2.5V–5.5V supply. It supports up to 400 kHz clock frequency at industrial and automotive temperature ranges (−40°C to +125°C), features Schmitt-trigger inputs for noise immunity, and enables cascaded multi-device memory expansion in embedded control and data logging systems.
For engineers reviewing the 24LC1025-E/SM datasheet, 24LC1025-E/SM pinout, 24LC1025-E/SM application, or 24LC1025-E/SM equivalent, key selection criteria include its 2.5–5.5 V operating range, automotive-grade −40°C to +125°C rating, 128-byte page write capability, hardware WP pin control, and dual 512 kbit address segments requiring B0 block select bit management.
Technical Context
The 24LC1025-E/SM implements a two-wire I²C interface with master-controlled SCL/SDA timing, supporting byte and page writes within 5 ms max write cycle time. Its internal address counter auto-increments during sequential reads, and it enforces strict 512 kbit segment boundaries (00000h–0FFFFh and 10000h–1FFFFh) governed by the B0 block select bit in the control byte.
Hardware write protection is asserted when WP = VCC, disabling all erase/write operations while permitting reads. The device uses Schmitt-trigger inputs on SDA/SCL (hysteresis ≥ 0.05 VCC) and slope-controlled outputs to suppress ground bounce-critical for reliable operation in noisy automotive and industrial bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 128K × 8 bits (1024 kbit); provides nonvolatile storage for firmware parameters, calibration data, or event logs in space-constrained designs. |
| Supply voltage | 2.5 V to 5.5 V; compatible with 3.3 V and 5 V logic domains without level shifting. |
| Max clock frequency | 400 kHz (at VCC ≥ 2.5 V, E-temp); enables faster configuration updates than 100 kHz legacy EEPROMs. |
| Page write buffer | 128 bytes; reduces write transaction overhead by up to 127× versus byte-write mode. |
| Endurance & retention | 1 million erase/write cycles; >200 years data retention at +85°C-validated for long-life industrial deployments. |
| Temperature range | −40°C to +125°C (Automotive E-grade); qualified for under-hood, powertrain, and motor control applications. |
| Write-protect method | Hardware pin (WP tied to VCC); prevents accidental overwrites during power-up/down or firmware updates. |
Pinout & Package
24LC1025-E/SM is housed in an 8-lead SOIC package (3.90 mm width), RoHS-compliant and Pb-free, with gull-wing leads and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | User-configurable chip address input | Hardwired to VSS or VCC to set LSB of 2-bit slave address; enables up to four devices on one I²C bus. |
| A1 | User-configurable chip address input | Hardwired to VSS or VCC to set MSB of 2-bit slave address; used with A0 for 4-device addressing. |
| A2 | Non-configurable chip select | Mandatory tie-to-VCC; device fails to respond if left floating or grounded-prevents misconfiguration in production. |
| VSS | Ground reference | System common return path; must be low-impedance to support stable I²C signaling and noise immunity. |
| SDA | Bidirectional serial data line | Open-drain I²C bus line requiring external pull-up (2 kΩ typical for 400 kHz); transmits addresses, commands, and data. |
| SCL | Serial clock input | Master-generated clock synchronizing all I²C transfers; Schmitt-trigger input ensures robust edge detection. |
| WP | Hardware write-protect input | Logic-high (VCC) disables all writes; logic-low (VSS) enables full read/write access-used for field update safety. |
| VCC | Power supply | 2.5–5.5 V DC input; powers EEPROM core, I/O buffers, and internal charge pump for write operations. |
Key Features
| Feature | Design Value |
|---|---|
| 128-byte page write buffer | Reduces total I²C transaction count for bulk writes-e.g., 128-byte parameter set written in one command instead of 128 separate byte writes. |
| Schmitt-trigger SDA/SCL inputs | ≥0.05 VCC hysteresis eliminates false triggering from bus noise, enabling reliable operation in electrically harsh environments. |
| Dual 512 kbit address segments | Enables contiguous 1 Mbit addressing across multiple devices via software-managed B0 bit and A0/A1 chip select mapping. |
| Self-timed erase/write cycle | Internal timing eliminates need for external delay loops; ACK polling confirms completion-maximizes bus utilization efficiency. |
| ESD protection >4 kV | Robust HBM rating protects against handling damage and system-level ESD events in manufacturing and field service. |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Storing calibrated sensor offsets, linearization coefficients, and fault history in a wireless environmental monitor deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with infrequent writes and frequent reads; accessed via I²C during boot and periodic recalibration. Use Value: 1M-cycle endurance ensures >10 years of daily recalibration at 200 cycles/year; −40°C to +85°C rating matches industrial ambient requirements. |
Use Scenario: Retaining door lock state, mirror position memory, and seat adjustment profiles in a vehicle body control unit (BCU). IC Role / Device Role / Timing Role: Automotive-grade EEPROM storing user preferences and safety-critical configuration; accessed during ignition-on and sleep-mode wake events. Use Value: E-temp (−40°C to +125°C) qualification meets AEC-Q100 Grade 2 requirements; hardware WP prevents corruption during battery transients. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Logging dose delivery history, error codes, and maintenance intervals in a Class II medical infusion device requiring regulatory traceability. IC Role / Device Role / Timing Role: Secure, tamper-resistant data logger with write-protection enabled during normal operation; accessed only during service mode. Use Value: >200-year data retention satisfies FDA 21 CFR Part 11 archival requirements; 2.5–5.5 V operation interfaces directly with pump's 3.3 V MCU rail. |
Use Scenario: Recording tariff schedules, meter calibration constants, and outage timestamps in a DIN-rail mounted electricity meter operating in utility substations. IC Role / Device Role / Timing Role: High-reliability configuration store interfaced to metrology SoC via isolated I²C; updated quarterly during firmware upgrades. Use Value: Cascadable 4-device topology supports future firmware expansion up to 4 Mbit; 128-byte page writes minimize upgrade time and bus contention. |
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/SM | Wider 1.7–5.5 V supply range; rated only for −40°C to +85°C (industrial grade). | Lacks automotive temperature qualification; unsuitable for under-hood or powertrain use. | Select when cost-sensitive industrial designs operate below 2.5 V or require extended low-voltage operation. |
| AT24C1024-MAHM-T | Same 1024 kbit density and I²C interface; 1.7–5.5 V supply; −40°C to +125°C; no A2 pin requirement (simpler layout). | Uses different slave address scheme and lacks B0 block select-no native 512 kbit segment addressing. | Choose for drop-in replacement where existing firmware does not rely on dual-segment addressing or A2 pin tie-high constraint. |
Compared with 24LC1025-E/SM, the 24AA1025-I/SM trades automotive qualification for broader voltage flexibility, while the AT24C1024-MAHM-T offers identical temp grade but removes the mandatory A2-to-VCC constraint-simplifying PCB routing at the cost of losing native 512 kbit boundary control.
Availability
24LC1025-E/SM is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor nodes, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.
Supply support for 24LC1025-E/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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 24LC1025-E/SM belongs to Microchip's serial EEPROM product line, engineered specifically for high-reliability, low-power, and automotive-qualified nonvolatile storage in resource-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by the 24LC1025-E/SM?
The 24LC1025-E/SM supports up to 400 kHz I²C clock frequency when operated at VCC ≥ 2.5 V and within its automotive temperature range (−40°C to +125°C). At VCC < 2.5 V, the maximum clock drops to 100 kHz. This dual-speed capability allows flexible integration across 3.3 V and 5 V systems while maintaining timing compliance per I²C specification.
How does the A2 pin function on the 24LC1025-E/SM?
The A2 pin on the 24LC1025-E/SM is a non-configurable chip select that must be hard-wired to VCC for proper device operation. If left floating or tied to VSS, the device enters an undefined state and will not respond to I²C commands. This design enforces deterministic initialization and prevents accidental misconfiguration in production assemblies.
Can the 24LC1025-E/SM perform sequential reads across its full 1024 kbit memory space?
No-the 24LC1025-E/SM restricts sequential reads to 512 kbit segments: 00000h–0FFFFh and 10000h–1FFFFh. To read across both segments, software must issue two separate sequential read commands, each preceded by a random address setup using the B0 block select bit. This segmentation is enforced by internal address pointer rollover behavior.
What happens when the WP pin is tied to VCC on the 24LC1025-E/SM?
When WP is tied to VCC on the 24LC1025-E/SM, all write and erase operations are inhibited-no data can be modified-but read operations remain fully functional. The device acknowledges write commands but performs no internal programming, allowing safe firmware updates or diagnostics without risk of unintended memory corruption.
Is the 24LC1025-E/SM pin-compatible with other members of the 24XX1025 family?
Yes-the 24LC1025-E/SM shares identical 8-pin SOIC (E/SM) packaging, pinout, and I²C interface protocol with the 24AA1025 and 24FC1025 variants. However, voltage range (2.5–5.5 V), clock speed (400 kHz vs. 1 MHz for FC), and temperature grade differ; direct substitution requires verification of these electrical and environmental specifications in the target application.
24LC1025-E/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:
- 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-SOIJ
24LC1025-E/SM FAQ
1.How can I place an order for 24LC1025-E/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC1025-E/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 24LC1025-E/SM reliable?
The price and inventory of 24LC1025-E/SM 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/SM is usually 5 days.
3.What payment methods are accepted for 24LC1025-E/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC1025-E/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC1025-E/SM?
24LC1025-E/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC1025-E/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 24LC1025-E/SM?
For technical support, including 24LC1025-E/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC1025-E/SM requirements.
6.How does Aetrix verify that 24LC1025-E/SM is sourced from the original manufacturer or authorized distributors?
All 24LC1025-E/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 24LC1025-E/SM meets industry standards.
7.What is the process for return or replacement of 24LC1025-E/SM?
All 24LC1025-E/SM units undergo pre-shipment inspection (PSI). If there is an issue with 24LC1025-E/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 24LC1025-E/SM part is unused and in its original packaging.
Return procedure for 24LC1025-E/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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