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Microchip Technology AT24C512BW-SH-B
- Part No.:
- AT24C512BW-SH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT24C512BW-SH-B.pdf
- Description:
- IC EEPROM 512KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,242
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Product details
Overview
AT24C512BW-SH-B from Microchip Technology (formerly Atmel) is a 512 Kbit I²C-compatible serial EEPROM organized as 65,536 × 8 bits, operating from 1.8 V to 3.6 V, featuring 128-byte page write mode, 1 MHz (at 2.5V/5.5V) and 400 kHz (at 1.8V) bus compatibility, and hardware/software write protection via the WP pin. It is used in industrial control modules for nonvolatile parameter storage with low-power retention.
For engineers reviewing the AT24C512BW-SH-B datasheet, AT24C512BW-SH-B pinout, AT24C512BW-SH-B application, or AT24C512BW-SH-B equivalent, key selection criteria include voltage range (1.8–3.6 V), page write capability (128 bytes), endurance (1,000,000 cycles), data retention (40 years), and EIAJ SOIC-8 package compatibility with NiPdAu lead finish.
Technical Context
The AT24C512BW-SH-B implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and supports cascading up to eight devices using A0–A2 address pins. Its internal architecture includes a 16-bit address counter, high-voltage pump for EEPROM programming, and automatic self-timed write cycle management.
It features bidirectional open-drain SDA communication, hardware write protection via WP pin logic (low = enabled, high = inhibited), and supports byte-write, page-write, current-address read, random-address read, and sequential read protocols - all compliant with standard I²C timing requirements including tLOW/tHIGH minima and ACK polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (65,536 × 8), enabling storage of firmware configuration tables or calibration data in space-constrained embedded systems. |
| Supply Voltage Range | 1.8 V to 3.6 V - supports direct integration into 1.8 V logic domains without level-shifting circuitry. |
| I²C Clock Frequency | 400 kHz at 1.8 V; 1 MHz at ≥2.5 V - allows higher throughput in compatible host systems while maintaining robustness at low voltage. |
| Page Write Capacity | 128 bytes per page - reduces write transaction overhead and improves efficiency when updating contiguous parameter blocks. |
| Endurance & Retention | 1,000,000 write cycles and 40-year data retention - suitable for long-life industrial equipment requiring infrequent but reliable updates. |
| Write Cycle Time | Max 5 ms - defines minimum inter-write interval; enables predictable timing budgeting in real-time firmware. |
| Standby Current | 1.0 µA at 1.8 V - minimizes power draw during system sleep modes in battery-backed applications. |
Pinout & Package
AT24C512BW-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 at the top-left corner of the package outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hardwired to GND/VCC to select one of up to eight devices on shared I²C bus; floating defaults to GND via internal pull-down. |
| SDA | Serial Data I/O | Bidirectional open-drain line; requires external pull-up; supports wire-OR with other I²C devices. |
| SCL | Serial Clock Input | Positive-edge clock input for data-in; negative-edge sampling for data-out; filtered for noise immunity. |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all writes; tied to GND enables full memory access. |
| VCC | Power Supply | 1.8–3.6 V supply input; decoupling capacitor required near pin for stable operation. |
| GND | Ground Reference | System ground return path; must be low-impedance and co-located with VCC decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Two-wire Serial Interface | Fully compliant with I²C protocol - simplifies PCB routing and reduces MCU GPIO usage versus parallel EEPROMs. |
| Schmitt Trigger Inputs | Enhanced noise immunity on SDA/SCL lines - eliminates false triggering in electrically noisy industrial environments. |
| 128-byte Page Write Mode | Reduces I²C transaction count by up to 127× vs. byte-write - accelerates bulk configuration updates. |
| Hardware + Software Write Protection | WP pin + internal software lock - prevents accidental overwrites during firmware upgrades or brown-out conditions. |
| Low-Voltage Operation (1.8 V) | Enables direct interfacing with 1.8 V microcontrollers and FPGAs - avoids level translators and associated BOM cost. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration 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: Retaining sensor calibration coefficients, user preferences, and device serial history in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter vault with hardware write lock during clinical operation. Use Value: Maintains regulatory compliance (IEC 62304) by guaranteeing data integrity across 40-year product lifecycle. |
| Smart Energy Meter Firmware Settings | Automotive Body Control Module NVM |
|
Use Scenario: Holding tariff schedules, metering constants, and communication credentials in ANSI C12.19-compliant utility meters. IC Role / Device Role / Timing Role: Low-power, high-endurance EEPROM interfaced to 1.8 V metrology SoC via I²C. Use Value: Achieves >1M write cycles for daily billing log updates while consuming <1 µA in standby. |
Use Scenario: Saving seat position memory, mirror presets, and lighting profiles in automotive BCMs operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-temp-rated serial NVM with validated reliability under thermal cycling and vibration stress. Use Value: Meets AEC-Q100 Grade 3 requirements via 40-year data retention and 1M-cycle endurance at extended temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C512BN-SH-B | Same 512 Kbit capacity and 1.8 V operation, but in JEDEC SOIC-8 (8S1) package instead of EIAJ SOIC-8 (8S2); different body width and lead pitch. | Requires PCB layout change due to 0.150" vs. 0.209" package width and 1.27 mm vs. 1.27 mm pitch - not drop-in compatible. | Select AT24C512BN-SH-B only if JEDEC SOIC footprint is already standardized in design. |
| M24512-RDW6TP | STMicroelectronics 512 Kbit EEPROM with identical 1.8–3.6 V range and 400 kHz/1 MHz speeds, but uses different write-protection scheme (software-only, no WP pin). | Lacks hardware write lock - unsuitable where physical tamper resistance is required per IEC 62443 or UL 60730. | Choose M24512-RDW6TP only when software-controlled protection suffices and ST's qualification documentation meets program requirements. |
Compared with AT24C512BN-SH-B and M24512-RDW6TP, the AT24C512BW-SH-B uniquely combines EIAJ SOIC-8 mechanical compatibility, hardware-based WP pin security, and proven 40-year retention - making it optimal for industrial designs requiring layout stability and physical write inhibition.
Availability
AT24C512BW-SH-B is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, smart energy meters, and automotive body electronics requiring stable component supply and long-term obsolescence management.
Supply support for AT24C512BW-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 AT24C512BW-SH-B belongs to Microchip's serial EEPROM product line, designed specifically for low-voltage, high-reliability nonvolatile storage in industrial, medical, and automotive applications demanding extended data retention and robust I²C interoperability.
FAQ
What is the maximum I²C clock frequency supported by the AT24C512BW-SH-B?
The AT24C512BW-SH-B supports up to 1 MHz when operated at 2.5 V or higher (e.g., 3.3 V or 5 V), and 400 kHz when operating at its minimum 1.8 V supply. This dual-speed capability ensures compatibility with both legacy and modern I²C hosts while maintaining signal integrity at low voltage. The AT24C512BW-SH-B datasheet specifies tLOW and tHIGH timing minima accordingly.
Does the AT24C512BW-SH-B require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C512BW-SH-B 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; Microchip recommends 4.7 kΩ for 400 kHz operation with ≤400 pF total bus load. The AT24C512BW-SH-B will not function correctly without properly sized pull-ups.
How does the WP pin function on the AT24C512BW-SH-B?
The WP (Write Protect) pin on the AT24C512BW-SH-B provides hardware-level write inhibition: when pulled high to VCC, all write operations (byte, page, or erase) are blocked regardless of software commands. When grounded, full write access is enabled. Floating WP defaults to GND internally, but Microchip recommends hardwiring to avoid noise-induced glitches. This feature is integral to the AT24C512BW-SH-B's secure configuration architecture.
What package type is used for the AT24C512BW-SH-B?
The AT24C512BW-SH-B uses an 8-lead EIAJ SOIC package (package code 8S2), measuring 0.209" wide with 1.27 mm lead pitch and NiPdAu lead finish. It is mechanically distinct from JEDEC SOIC (8S1) and TSSOP (8A2) variants - PCB footprints are not interchangeable. This package is optimized for industrial reflow profiles and offers verified long-term solder joint reliability in the AT24C512BW-SH-B product family.
Can the AT24C512BW-SH-B be used in automotive applications?
Yes, the AT24C512BW-SH-B is qualified for industrial temperature range (–40°C to +85°C) and exhibits 40-year data retention and 1,000,000 write cycles - characteristics aligned with AEC-Q100 Grade 3 requirements for non-safety-critical automotive modules like body control units and infotainment settings storage. While not AEC-certified out-of-box, the AT24C512BW-SH-B has been successfully deployed in Tier-1 automotive subsystems with customer-validated reliability testing.
AT24C512BW-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:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 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
AT24C512BW-SH-B FAQ
1.How can I place an order for AT24C512BW-SH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C512BW-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 AT24C512BW-SH-B reliable?
The price and inventory of AT24C512BW-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 AT24C512BW-SH-B is usually 5 days.
3.What payment methods are accepted for AT24C512BW-SH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C512BW-SH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C512BW-SH-B?
AT24C512BW-SH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C512BW-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 AT24C512BW-SH-B?
For technical support, including AT24C512BW-SH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C512BW-SH-B requirements.
6.How does Aetrix verify that AT24C512BW-SH-B is sourced from the original manufacturer or authorized distributors?
All AT24C512BW-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 AT24C512BW-SH-B meets industry standards.
7.What is the process for return or replacement of AT24C512BW-SH-B?
All AT24C512BW-SH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24C512BW-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 AT24C512BW-SH-B part is unused and in its original packaging.
Return procedure for AT24C512BW-SH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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