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Microchip Technology AT24C1024BW-SH-B
- Part No.:
- AT24C1024BW-SH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT24C1024BW-SH-B.pdf
- Description:
- IC EEPROM 1MBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,168
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Product details
Overview
AT24C1024BW-SH-B from Microchip Technology (formerly Atmel) is a 1 Mbit (131,072 × 8) two-wire serial EEPROM optimized for low-voltage industrial and embedded systems. It operates from 1.8V to 3.6V, supports 400 kHz I²C clock rate at 1.8V, features hardware write protection via WP pin, and delivers 1,000,000 write cycles per page with 40-year data retention - used in firmware storage, calibration data logging, and configuration memory for programmable logic controllers.
For engineers reviewing the AT24C1024BW-SH-B datasheet, AT24C1024BW-SH-B pinout, AT24C1024BW-SH-B application, or AT24C1024BW-SH-B equivalent, this page provides verified package mapping (8-lead EIAJ SOIC), confirmed pin functions (A1/A2 device addressing, SDA/SCL I²C interface), endurance and retention specs, noise-suppression design (Schmitt-trigger inputs), and real-world use context for industrial temperature (–40°C to +85°C) deployments.
Technical Context
The AT24C1024BW-SH-B implements a standard two-wire (I²C-compatible) serial interface with bidirectional open-drain SDA and edge-triggered SCL, supporting cascaded operation of up to four devices via A1/A2 address inputs. Its internal architecture organizes memory as 512 pages of 256 bytes each, requiring 17-bit addressing with P0 bit embedded in the device address byte.
It features Schmitt-trigger inputs and digital noise filtering on all control pins, enabling robust operation in electrically noisy environments. Write operations support both byte and 256-byte page modes, with self-timed internal write cycles (5 ms typical) and acknowledge polling for host synchronization - no external timing components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (131,072 × 8), organized as 512 pages × 256 bytes - enables full firmware image storage or multi-parameter calibration tables in compact footprint. |
| Supply Voltage Range | 1.8V to 3.6V - compatible with modern ultra-low-power microcontrollers and battery-backed systems without level-shifting. |
| I²C Clock Rate | 400 kHz at 1.8V - ensures reliable communication on long traces or noisy boards while maintaining compatibility with legacy I²C peripherals. |
| Write Endurance | 1,000,000 write cycles per page - supports frequent recalibration or event-logging applications over 10+ years of field operation. |
| Data Retention | 40 years at +85°C - validated for mission-critical industrial equipment where firmware or configuration integrity must persist across product lifecycles. |
| Operating Temperature | –40°C to +85°C - qualified for deployment in programmable logic controllers, motor drives, and outdoor metering hardware. |
| Input Capacitance | SDA: ≤8 pF, A1/SCL: ≤6 pF - minimizes bus loading and enables longer trace lengths or higher node counts on shared I²C buses. |
Pinout & Package
AT24C1024BW-SH-B is packaged in an 8-lead EIAJ SOIC (package code 8S2), 0.209" body width, with NiPdAu lead finish. Pin 1 is marked by a notch or dot; leads are gull-wing, RoHS-compliant, and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unconnected; must be left floating or tied to GND - no electrical function or signal routing required. |
| 2 (A1) | Device Address Input | Hardwired high/low or left floating (internally pulled down); selects one of four possible I²C addresses on shared bus. |
| 3 (A2) | Device Address Input | Second address bit; used with A1 to enable up to four AT24C1024BW-SH-B devices on same I²C bus without address conflict. |
| 4 (GND) | Ground Reference | Primary return path for VCC and I/O signals; requires low-impedance connection to system ground plane. |
| 5 (VCC) | Power Supply | 1.8V–3.6V supply input; bypass capacitor (0.1 µF ceramic) recommended within 5 mm of pin for noise immunity. |
| 6 (WP) | Write Protect Control | Active-high hardware lock: tied to VCC disables all writes; tied to GND enables normal read/write; floating defaults to GND via internal pull-down. |
| 7 (SCL) | Serial Clock Input | Positive-edge clock for I²C transactions; requires external pull-up resistor (typically 2.2–10 kΩ to VCC). |
| 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 |
|---|---|
| Schmitt-trigger inputs with noise filtering | Suppresses >100 ns glitches on SCL/SDA/WP - eliminates false start/stop detection in industrial EMI environments. |
| 256-byte page write mode | Reduces firmware update time by 256× vs. byte-write; supports partial-page writes without erasing adjacent bytes. |
| Hardware + software write protection | WP pin blocks all writes when high; software protection enabled by switching WP to VCC mid-transaction - dual-layer security for critical config data. |
| Self-timed 5 ms write cycle | Eliminates need for external wait-state logic or polling delays; host can initiate acknowledge polling immediately after STOP condition. |
| 17-bit random addressing | Enables direct access to any byte in 1 Mbit array without sequential scanning - essential for fast parameter lookup in real-time control loops. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Logging |
|---|---|
|
Use Scenario: Storing user-defined I/O mapping, PID tuning parameters, and alarm thresholds in modular programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via I²C during boot and runtime; retains settings across power cycles and brownouts. Use Value: Enables field-reprogrammable behavior without firmware reflashing; 40-year retention ensures parameter integrity over equipment lifetime. |
Use Scenario: Recording sensor calibration coefficients, usage history, and regulatory audit logs in portable diagnostic instruments with battery backup. IC Role / Device Role / Timing Role: Secure, low-power data logger interfaced to MCU via I²C; WP pin prevents accidental overwrite during routine diagnostics. Use Value: Meets IEC 62304 Class B software requirements for data persistence; 1Mbit capacity stores >10,000 calibration records with timestamps. |
| Smart Energy Meter Firmware Backup | Automotive Body Control Module Settings |
|
Use Scenario: Holding bootloader recovery images and tariff tables in ANSI C12.22-compliant electricity meters exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Redundant firmware storage element; accessed only during OTA updates or corruption recovery sequences. Use Value: 1.8V operation allows direct connection to meter's 3.3V LDO output; –40°C to +85°C rating matches EN 50470-3 environmental class. |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock configurations in automotive BCMs with CAN/LIN interfaces. IC Role / Device Role / Timing Role: Secondary nonvolatile memory co-located with main MCU; isolated from CAN transceivers to prevent ESD coupling. Use Value: NiPdAu lead finish ensures solder joint reliability under thermal cycling; 1Mbit size accommodates future feature expansion without PCB redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C1024D-SSHM-T | Same 1 Mbit density and 1.8V operation, but in 8-lead JEDEC SOIC (8S1) package; identical pinout except NC pin at position 1 replaced by functional A0 in some variants. | Designed for automated assembly on legacy SOIC footprints; lacks EIAJ SOIC mechanical compatibility for board-level drop-in replacement. | Select when using JEDEC-compliant pick-and-place tooling or requiring A0 address flexibility for larger bus topologies. |
| M24C1024-RMN6TP | STMicroelectronics 1 Mbit EEPROM; supports 1 MHz I²C at 2.5–5.5V, but only 100 kHz at 1.8V - lower speed in low-voltage mode than AT24C1024BW-SH-B. | Targeted at mixed-voltage systems with 3.3V/5V rails; not optimized for ultra-low-power 1.8V subsystems like sensor nodes or wearables. | Choose when system operates at ≥2.5V and requires faster write throughput; avoid for battery-powered 1.8V designs needing 400 kHz bus performance. |
Compared with AT24C1024D-SSHM-T and M24C1024-RMN6TP, the AT24C1024BW-SH-B uniquely combines 400 kHz I²C speed at 1.8V, EIAJ SOIC packaging for space-constrained industrial layouts, and proven 40-year data retention - making it optimal for low-voltage, long-lifecycle embedded storage where bus timing and mechanical fit are critical.
Availability
AT24C1024BW-SH-B is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, smart metering, and automotive body electronics requiring stable component supply and long-term obsolescence management.
Supply support for AT24C1024BW-SH-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 company specializes in secure, reliable, and low-power semiconductor solutions for industrial, automotive, and IoT markets.
The AT24C1024BW-SH-B belongs to Microchip's serial EEPROM product line, engineered specifically for robust nonvolatile data storage in harsh environments - emphasizing endurance, retention, and noise-immune I²C communication for mission-critical embedded systems.
FAQ
What is the maximum I²C clock frequency supported by AT24C1024BW-SH-B at 1.8V?
The AT24C1024BW-SH-B supports up to 400 kHz I²C clock frequency when operated at 1.8V. This is explicitly characterized in the AC specifications table under "1.8-volt" conditions and verified across the industrial temperature range (–40°C to +85°C). Higher frequencies (e.g., 1 MHz) require VCC ≥2.5V and are not guaranteed at 1.8V.
Does AT24C1024BW-SH-B support page write operations, and what is the maximum page size?
Yes, the AT24C1024BW-SH-B supports 256-byte page write operations. Each of its 512 pages is 256 bytes wide, and the device accepts up to 256 sequential bytes in a single write transaction - significantly reducing firmware update time compared to byte-wise writes. Partial page writes are also permitted without erasing unused bytes in the same page.
How is device addressing implemented on AT24C1024BW-SH-B, and how many units can share one I²C bus?
The AT24C1024BW-SH-B uses two hardware address inputs (A1 and A2) to configure its 7-bit I²C device address. With A1 and A2 hardwired high/low or left floating (internally pulled down), up to four AT24C1024BW-SH-B devices can coexist on the same I²C bus without address collision - enabling scalable memory expansion in multi-node systems.
What is the purpose of the NC pin (Pin 1) on AT24C1024BW-SH-B in the 8S2 package?
Pin 1 of the AT24C1024BW-SH-B is designated NC (No Connect) and is internally unconnected. It must be left floating or tied to GND - it serves no electrical function and carries no signal. This pin exists for mechanical compatibility with other members of the AT24Cxx family and does not affect operation or timing of the AT24C1024BW-SH-B.
Is AT24C1024BW-SH-B qualified for industrial temperature operation, and what is its specified range?
Yes, the AT24C1024BW-SH-B is fully qualified for industrial temperature operation across –40°C to +85°C. This range is explicitly stated in the Absolute Maximum Ratings and DC Characteristics tables, and all key parameters - including write endurance, data retention, and I²C timing - are characterized and guaranteed within this interval.
AT24C1024BW-SH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm 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:
- 1.8V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24C1024BW-SH-B FAQ
1.How can I place an order for AT24C1024BW-SH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C1024BW-SH-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 AT24C1024BW-SH-B reliable?
The price and inventory of AT24C1024BW-SH-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C1024BW-SH-B is usually 5 days.
3.What payment methods are accepted for AT24C1024BW-SH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C1024BW-SH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C1024BW-SH-B?
AT24C1024BW-SH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C1024BW-SH-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 AT24C1024BW-SH-B?
For technical support, including AT24C1024BW-SH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C1024BW-SH-B requirements.
6.How does Aetrix verify that AT24C1024BW-SH-B is sourced from the original manufacturer or authorized distributors?
All AT24C1024BW-SH-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 AT24C1024BW-SH-B meets industry standards.
7.What is the process for return or replacement of AT24C1024BW-SH-B?
All AT24C1024BW-SH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24C1024BW-SH-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 AT24C1024BW-SH-B part is unused and in its original packaging.
Return procedure for AT24C1024BW-SH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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