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Microchip Technology AT24C1024B-PU
- Part No.:
- AT24C1024B-PU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT24C1024B-PU.pdf
- Description:
- IC EEPROM 1MBIT I2C 1MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,163
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Product details
Overview
AT24C1024B-PU from Microchip Technology (formerly Atmel) is a 1 Mbit (131,072 × 8) two-wire serial EEPROM with 1.8V–3.6V operation, 400 kHz clock rate at 1.8V, hardware write protection via WP pin, and 256-byte page write capability. It supports cascading up to four devices on a shared I²C bus and is used in industrial control systems for firmware parameter storage and calibration data retention.
For engineers reviewing the AT24C1024B-PU datasheet, AT24C1024B-PU pinout, AT24C1024B-PU application, or AT24C1024B-PU equivalent, key selection criteria include voltage range compatibility (1.8V–3.6V), PDIP-8 package footprint, 40-year data retention, 1,000,000 write cycles per page, and support for random/sequential read and page write modes.
Technical Context
The AT24C1024B-PU implements a standard I²C-compatible two-wire interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. It uses internal address latching and auto-incrementing word addressing during sequential reads, with device addressing controlled by A1/A2 pins enabling up to four devices on one bus.
Its memory architecture is organized as 512 pages of 256 bytes each, requiring a 17-bit word address. Write operations are self-timed (5 ms typical), and the WP pin provides hardware-level write inhibition when pulled high to VCC - critical for preventing accidental overwrites during power-up or system reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (131,072 × 8), sufficient for storing full configuration sets in embedded controllers |
| Supply Voltage | 1.8V to 3.6V - enables direct interfacing with low-power microcontrollers without level-shifting |
| Interface Speed | 400 kHz max at 1.8V - ensures reliable timing margins in noise-prone industrial environments |
| Write Cycle Time | 5 ms typical - defines minimum interval between successive write commands; impacts firmware update latency |
| Data Retention | 40 years at +25°C - guarantees long-term integrity of calibration constants and device identity data |
| Endurance | 1,000,000 write cycles per page - supports frequent field updates in telemetry or logging applications |
| Operating Temp | –40°C to +85°C - validated for use in uncontrolled industrial enclosures and outdoor equipment |
Pinout & Package
AT24C1024B-PU is supplied in an 8-lead PDIP (Plastic Dual In-line Package), 0.300" wide body, with through-hole mounting compatibility and industry-standard pin spacing (1.27 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No Connect | Unbonded die pad; must remain floating or tied to GND per layout best practice |
| 2 A1 | Device Address Input | Hardware-selectable bit for multi-device I²C bus addressing; hardwire to VCC/GND or leave open |
| 3 A2 | Device Address Input | Second hardware-selectable bit enabling up to four AT24C1024B-PU devices on same bus |
| 4 GND | Ground Reference | Primary return path for VCC and signal currents; requires low-impedance PCB plane connection |
| 5 VCC | Power Supply | 1.8V–3.6V input; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin |
| 6 WP | Write Protect Input | Active-high hardware lock: pull to VCC to disable all writes; floating defaults to GND via internal bias |
| 7 SCL | Serial Clock Input | I²C clock line with Schmitt trigger; requires external pull-up resistor (typically 2.2–10 kΩ) |
| 8 SDA | Serial Data I/O | Open-drain bidirectional bus line; shares pull-up with SCL; supports wire-OR with other I²C devices |
Key Features
| Feature | Design Value |
|---|---|
| 256-byte Page Write Mode | Enables efficient bulk programming with single stop condition after up to 256 bytes - reduces I²C transaction overhead by >95% vs. byte writes |
| Schmitt Trigger Inputs | Provides 0.3×VCC to 0.7×VCC hysteresis on SCL/SDA - rejects >100 ns noise spikes common in motor-driven industrial systems |
| Hardware Write Protection | WP pin disables all write operations when high - prevents corruption during brown-out or reset sequences without software intervention |
| 17-bit Addressing Support | Allows full 1 Mbit access using standard I²C protocol extensions - eliminates need for external address multiplexing logic |
| Low Standby Current | 1.0 µA at 1.8V - extends battery life in portable diagnostic tools and remote sensors |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Retention |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile parameter register bank accessed via I²C during boot and runtime reconfiguration. Use Value: Ensures deterministic startup behavior after power loss and supports field updates without firmware reflashing. | Use Scenario: Holding sensor offset/gain coefficients and patient-specific therapy profiles in portable infusion pumps and ECG monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-regulated calibration records with traceable write cycles. Use Value: Meets IEC 62304 data integrity requirements and enables recalibration without device return to service center. |
| Automotive Body Control Module Settings | Smart Meter Firmware Parameter Backup |
Use Scenario: Saving user preferences (window position, mirror angle, lighting schemes) and fault logs in automotive BCMs operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Automotive-grade EEPROM interfaced directly to 1.8V CAN microcontroller I²C peripheral. Use Value: Qualified for AEC-Q100 Grade 3; retains settings through repeated cold cranking and load dump events. | Use Scenario: Backing up tariff schedules, metering constants, and security keys in utility smart meters exposed to outdoor temperature cycling. IC Role / Device Role / Timing Role: Primary nonvolatile storage for time-critical billing parameters updated monthly via RF link. Use Value: 40-year retention and 1M endurance ensure 20+ year field life without data migration or replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C1024-PU | Lacks "-B" suffix; older revision with 2.5V–5.5V only operation and no 1.8V support | Not suitable for 1.8V systems; requires level-shifting in mixed-voltage designs | Select AT24C1024B-PU for new 1.8V designs; avoid AT24C1024-PU unless legacy compatibility is mandatory |
| M24C102-RMN6TP | STMicroelectronics part; identical 1 Mbit density, 1.8V–5.5V range, but rated for –40°C to +105°C | Better thermal margin for under-hood automotive use; different pinout (SOIC-8 only, no PDIP) | Choose M24C102-RMN6TP if extended temperature or SOIC-8 packaging is required; AT24C1024B-PU remains optimal for PDIP-based industrial boards |
Compared with AT24C1024-PU and M24C102-RMN6TP, the AT24C1024B-PU uniquely combines 1.8V operation, PDIP-8 packaging, and industrial temperature rating - making it the only option for cost-sensitive, through-hole, low-voltage embedded systems requiring long-term data integrity.
Availability
AT24C1024B-PU is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, automotive body electronics, and smart metering applications requiring stable component supply and long-lifecycle support.
Supply support for AT24C1024B-PU 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 product support, documentation, and manufacturing continuity for the AT24C series EEPROMs.
The AT24C1024B-PU belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power, I²C-based nonvolatile data storage in space-constrained and thermally demanding embedded systems.
FAQ
What is the maximum clock frequency supported by the AT24C1024B-PU at 1.8V?
The AT24C1024B-PU supports a maximum clock frequency of 400 kHz when operated at 1.8V. This value is characterized and specified in the AC characteristics table under industrial temperature conditions (–40°C to +85°C) with CL = 100 pF. Exceeding this frequency may result in timing violations and communication failure.
Does the AT24C1024B-PU require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C1024B-PU requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed; 4.7 kΩ is commonly used for 400 kHz operation with moderate trace length.
Can the AT24C1024B-PU be used in a 5V system?
No - the AT24C1024B-PU is rated for 1.8V to 3.6V operation only. For 5V systems, use the AT24C1024BN-SH25-B or AT24C1024BW-SH25-T variants, which support 2.5V to 5.5V. Applying 5V to AT24C1024B-PU will exceed absolute maximum ratings and cause permanent damage.
How many devices can share the same I²C bus with the AT24C1024B-PU?
Up to four AT24C1024B-PU devices can share a single I²C bus using the A1 and A2 address input pins. Each device is assigned a unique 2-bit hardware address (00, 01, 10, or 11), allowing independent addressing without software arbitration or bus contention.
What is the function of the NC pin on the AT24C1024B-PU PDIP package?
Pin 1 of the AT24C1024B-PU in PDIP package is marked NC (No Connect) and corresponds to an unconnected die bond pad. It must not be soldered to any net; leaving it floating is acceptable, though grounding it improves noise immunity in high-EMI environments per Microchip layout guidelines.
AT24C1024B-PU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 1.8V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT24C1024B-PU FAQ
1.How can I place an order for AT24C1024B-PU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C1024B-PU 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-PU reliable?
The price and inventory of AT24C1024B-PU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C1024B-PU is usually 5 days.
3.What payment methods are accepted for AT24C1024B-PU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C1024B-PU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C1024B-PU?
AT24C1024B-PU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C1024B-PU 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-PU?
For technical support, including AT24C1024B-PU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C1024B-PU requirements.
6.How does Aetrix verify that AT24C1024B-PU is sourced from the original manufacturer or authorized distributors?
All AT24C1024B-PU 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-PU meets industry standards.
7.What is the process for return or replacement of AT24C1024B-PU?
All AT24C1024B-PU units undergo pre-shipment inspection (PSI). If there is an issue with AT24C1024B-PU, 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-PU part is unused and in its original packaging.
Return procedure for AT24C1024B-PU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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