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Microchip Technology AT24C1024B-TH25-B
- Part No.:
- AT24C1024B-TH25-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C1024B-TH25-B.pdf
- Description:
- IC EEPROM 1MBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,876
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Product details
Overview
AT24C1024B-TH25-B from Microchip Technology (formerly Atmel) is a 1 Mbit (131,072 × 8) two-wire serial EEPROM optimized for low-voltage industrial applications. It operates from 2.5V to 5.5V, supports 1 MHz clock rate at 2.5V/5V, features hardware write protection via WP pin, and uses 8-lead TSSOP package with NiPdAu lead finish.
For engineers reviewing the AT24C1024B-TH25-B datasheet, AT24C1024B-TH25-B pinout, AT24C1024B-TH25-B application, or AT24C1024B-TH25-B equivalent, key selection criteria include voltage range compatibility (2.5–5.5 V), 1 MHz I²C timing support, 256-byte page write capability, 40-year data retention, and TSSOP-8 mechanical fit in space-constrained embedded systems.
Technical Context
The AT24C1024B-TH25-B implements a standard two-wire (I²C-compatible) interface with Schmitt-triggered, noise-filtered inputs and open-drain SDA/SCL pins. Its internal architecture includes a 17-bit address counter, cascading support for up to four devices on one bus using A1/A2 address inputs, and a dedicated write-protect circuit tied to the WP pin.
It supports three read modes-current address, random, and sequential-and two write modes-byte and 256-byte page write-with self-timed internal write cycles (5 ms typical). Addressing uses an 8-bit device address with P0 as the MSB of the memory word address and R/W bit as LSB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (131,072 × 8), enabling storage of firmware patches or calibration data in resource-limited microcontrollers |
| Supply Voltage Range | 2.5V to 5.5V - compatible with legacy 3.3V and 5V logic domains without level-shifting |
| I²C Clock Rate | Up to 1 MHz at 2.5V/5V - enables faster configuration loading vs. 400 kHz variants in time-critical boot sequences |
| Page Write Size | 256 bytes per page - reduces write overhead when updating large parameter blocks in sensor nodes or power supplies |
| Data Retention | 40 years at +85°C - ensures long-term reliability in industrial control panels and metering equipment |
| Endurance | 1,000,000 write cycles per page - supports frequent logging or runtime parameter tuning in test instrumentation |
| Write Protect | Hardware-enabled via WP pin tied to VCC - prevents accidental overwrites during field firmware updates or brown-out conditions |
Pinout & Package
AT24C1024B-TH25-B is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP), 4.4 mm body width, with NiPdAu lead finish. Pin 1 is marked by a dot at the top-left corner of the package bottom view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 2.5–5.5 V; decoupling capacitor required within 10 mm for stable I²C communication |
| WP | Hardware write protect control | Pulled high to VCC to lock entire memory; floating defaults to GND via internal bias for default write-enable |
| SCL | Serial clock input | Positive-edge sampled; requires external pull-up; supports 1 MHz max frequency at 2.5V/5V |
| SDA | Bi-directional serial data | Open-drain output; must be wire-ORed with other I²C devices using shared pull-up resistor |
| NC | No-connect terminal | Internally unconnected; left floating per design - no PCB trace or component required |
| A1, A2 | Device address inputs | Set hardware address bits to enable up to four AT24C1024B devices on same I²C bus; floating defaults to logic low |
| GND | Ground reference | Must be connected to system ground plane with low-impedance path to minimize noise coupling into SDA/SCL |
Key Features
| Feature | Design Value |
|---|---|
| Two-wire serial interface | Fully compatible with standard I²C protocol, reducing MCU GPIO usage and simplifying PCB routing in multi-peripheral systems |
| 256-byte page write mode | Minimizes host MCU intervention during bulk writes - improves throughput in data loggers and configuration managers |
| Schmitt-triggered, filtered inputs | Rejects >100 ns noise spikes on SCL/SDA lines - enhances robustness in electrically noisy factory automation environments |
| Self-timed 5 ms write cycle | Eliminates need for host polling delay timers; ACK polling allows non-blocking status checks after write initiation |
| 17-bit addressing with cascading | Enables full 1 Mbit access across 512 pages while supporting up to four devices on one bus - ideal for modular backplane designs |
Applications
| Industrial PLC I/O Modules | Smart Energy Meters |
|---|---|
Use Scenario: Storing calibrated sensor offsets and channel-specific gain coefficients across multiple analog input channels. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed during power-up initialization and field recalibration events. Use Value: Enables traceable, field-updatable calibration without requiring firmware reflash or external programming tools. | Use Scenario: Recording tamper events, billing cycle timestamps, and tariff schedule tables in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: High-endurance, long-retention data logger interfaced via I²C to metrology SoC. Use Value: Survives 1M+ write cycles and retains data for 40 years at 85°C - meets IEC 62056 and ANSI C12.20 requirements. |
| Medical Diagnostic Equipment | Automotive Body Control Modules |
Use Scenario: Saving user-defined imaging presets, service history logs, and safety interlock states in portable ultrasound units. IC Role / Device Role / Timing Role: Secure, WP-protected configuration store accessible only during authorized maintenance sessions. Use Value: Prevents unauthorized modification of clinical settings via hardware-level write lock - supports FDA 21 CFR Part 11 compliance. | Use Scenario: Storing seat position memory, mirror angle profiles, and lighting configuration preferences in vehicle door modules. IC Role / Device Role / Timing Role: Low-power EEPROM accessed during ignition-on initialization and driver profile recall. Use Value: Operates reliably across –40°C to +85°C automotive temperature range with <3 µA standby current at 2.5V - extends battery life in sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C1024D-SSHD-T | Same 1 Mbit density and 2.5–5.5 V operation, but in 8-lead SOIC package with different lead finish (matte Sn) | SOIC-8 footprint requires PCB redesign; lacks TSSOP's 4.4 mm width advantage for dense layouts | Select when SOIC assembly infrastructure is already in place and thermal profile favors Sn over NiPdAu |
| M95M01-RDW6TP | 1 Mbit SPI EEPROM (not I²C); 2.5–5.5 V; 10 MHz clock; 40-year retention; 1M endurance | Requires SPI interface instead of I²C - incompatible with existing two-wire bus topology | Choose only if host MCU has spare SPI peripheral and board layout permits signal separation from I²C domain |
Compared with AT24C1024B-TH25-B, the AT24C1024D-SSHD-T offers identical electrical behavior but different packaging and finish, while the M95M01-RDW6TP replaces I²C with SPI - demanding interface redesign but delivering higher throughput for burst writes.
Availability
AT24C1024B-TH25-B is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart energy meters, medical diagnostic equipment, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for AT24C1024B-TH25-B 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 acquired Atmel in 2016 and maintains full technical and manufacturing continuity for the AT24Cxx EEPROM family.
The AT24C1024B product line delivers high-reliability, low-voltage serial EEPROMs designed for industrial, automotive, and medical systems where long-term data integrity and I²C bus compatibility are critical.
FAQ
What is the maximum I²C clock frequency supported by AT24C1024B-TH25-B?
The AT24C1024B-TH25-B supports up to 1 MHz I²C clock frequency when operating at 2.5V or 5V supply. At 1.8V it is rated for 400 kHz only, but AT24C1024B-TH25-B is specifically the 2.5V variant - so 1 MHz is its guaranteed maximum speed under recommended conditions. This enables faster configuration loads than standard 400 kHz EEPROMs in time-sensitive boot sequences.
Does AT24C1024B-TH25-B require external pull-up resistors on SDA and SCL lines?
Yes, AT24C1024B-TH25-B requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Recommended values are 1.3 kΩ for 2.5V/5V operation and 10 kΩ for 1.8V - though AT24C1024B-TH25-B operates only from 2.5V to 5.5V, so 1.3 kΩ is appropriate. Pull-ups must connect to the same VCC rail used by the device.
How many AT24C1024B-TH25-B devices can share the same I²C bus?
Up to four AT24C1024B-TH25-B devices can share a single I²C bus using the A1 and A2 address input pins. Each device's A1/A2 combination sets a unique 2-bit hardware address, allowing distinct addressing without software arbitration. Floating A1/A2 defaults to logic low, so all unconfigured devices would collide - hardwiring is required for multi-drop operation.
What is the function of the NC pin on AT24C1024B-TH25-B in TSSOP package?
The NC (No Connect) pin on AT24C1024B-TH25-B is internally unconnected and serves no electrical function. It appears in Pin 5 position on the TSSOP-8 package layout and must remain unconnected on the PCB - no trace, pad, or component should be attached. Its presence maintains mechanical symmetry and alignment compatibility with other 8-lead packages in the AT24Cxx family.
Can AT24C1024B-TH25-B retain data during power loss or reset events?
Yes, AT24C1024B-TH25-B retains stored data indefinitely during power loss or system reset due to its nonvolatile EEPROM cell structure. Data remains valid for 40 years at +85°C and withstands 1,000,000 write cycles per page. The device enters low-power standby mode automatically after STOP condition receipt, drawing only 2–6 µA - ensuring zero data corruption during brown-out or controlled shutdown sequences.
AT24C1024B-TH25-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 550 ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT24C1024B-TH25-B FAQ
1.How can I place an order for AT24C1024B-TH25-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C1024B-TH25-B 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 AT24C1024B-TH25-B reliable?
The price and inventory of AT24C1024B-TH25-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C1024B-TH25-B is usually 5 days.
3.What payment methods are accepted for AT24C1024B-TH25-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C1024B-TH25-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C1024B-TH25-B?
AT24C1024B-TH25-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C1024B-TH25-B 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 AT24C1024B-TH25-B?
For technical support, including AT24C1024B-TH25-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C1024B-TH25-B requirements.
6.How does Aetrix verify that AT24C1024B-TH25-B is sourced from the original manufacturer or authorized distributors?
All AT24C1024B-TH25-B 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 AT24C1024B-TH25-B meets industry standards.
7.What is the process for return or replacement of AT24C1024B-TH25-B?
All AT24C1024B-TH25-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24C1024B-TH25-B, 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 AT24C1024B-TH25-B part is unused and in its original packaging.
Return procedure for AT24C1024B-TH25-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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