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Microchip Technology AT24C512BW-SH25-T
- Part No.:
- AT24C512BW-SH25-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT24C512BW-SH25-T.pdf
- Description:
- IC EEPROM 512KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,608
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Product details
Overview
AT24C512BW-SH25-T from Microchip Technology (formerly Atmel) is a 512 Kbit I²C-compatible serial EEPROM organized as 65,536 × 8 bits, operating at 2.5V to 5.5V supply, featuring hardware write protection via WP pin, 128-byte page write mode, and 1 MHz I²C clock support at 2.5V/5.5V - used for firmware storage, calibration data retention, and configuration memory in industrial controllers and embedded systems.
For engineers reviewing the AT24C512BW-SH25-T datasheet, AT24C512BW-SH25-T pinout, AT24C512BW-SH25-T application, or AT24C512BW-SH25-T equivalent, this page delivers verified package mapping (8-lead EIAJ SOIC), confirmed pin functions (A0–A2, SDA, SCL, WP, VCC, GND), endurance (1M cycles), data retention (40 years), and two validated alternative parts with documented functional and interface differences.
Technical Context
The AT24C512BW-SH25-T implements a two-wire I²C interface with Schmitt-triggered, noise-filtered inputs and bidirectional open-drain SDA signaling. It supports cascading up to eight devices on one bus using three hardware address pins (A0–A2).
It features internal address auto-increment during sequential reads/writes, acknowledge polling for write-cycle completion detection, and a self-timed write cycle with maximum 5 ms duration. The device operates across –40°C to +85°C and supports both byte and 128-byte page write modes with partial-page capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (65,536 × 8), enabling storage of firmware patches or multi-sensor calibration tables in space-constrained designs |
| Supply Voltage Range | 2.5V to 5.5V - compatible with legacy 3.3V and 5V microcontroller I/O domains without level shifting |
| I²C Clock Frequency | Up to 1 MHz at 2.5V/5.5V - enables faster configuration loading versus 400 kHz standard EEPROMs |
| Write Cycle Time | Max 5 ms - deterministic timing for host firmware to schedule post-write delays or polling intervals |
| Endurance & Retention | 1,000,000 write cycles and 40-year data retention - suitable for field-updatable systems requiring long-term reliability |
| Operating Temperature | –40°C to +85°C industrial grade - validated for use in programmable logic controllers and motor drives |
| Input Capacitance | ≤6 pF on A0/A1/SCL - ensures robust signal integrity on long I²C traces with multiple slaves |
Pinout & Package
AT24C512BW-SH25-T is packaged in an 8-lead EIAJ SOIC (package code 8S2), 0.209" body width, gull-wing lead form, NiPdAu lead finish. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high to select one of eight possible I²C addresses; floating defaults to GND via internal pull-down |
| A1 | Device Address Input | Second bit of 3-bit hardware address; enables multi-device bus topology without software reconfiguration |
| A2 | Device Address Input | Most significant address bit; allows up to eight AT24C512BW-SH25-T devices on shared SDA/SCL lines |
| GND | Ground Reference | Return path for VCC and all I/O signals; requires low-impedance connection to minimize I²C noise coupling |
| VCC | Power Supply | 2.5V–5.5V input; decoupling capacitor (0.1 µF) required within 10 mm of pin for stable I²C operation |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all writes; tied to GND enables full read/write access |
| SCL | Serial Clock Input | Positive-edge sampled clock; must meet tLOW ≥0.4 µs and tHIGH ≥0.25 µs at 1 MHz for reliable timing |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up (1.3 kΩ @5V, 10 kΩ @1.8V) and wire-OR capability |
Key Features
| Feature | Design Value |
|---|---|
| 128-byte Page Write Mode | Reduces firmware update time by >90% vs. byte writes - 128 bytes written in one 5 ms cycle instead of 128×5 ms |
| Schmitt Trigger Inputs | Enables reliable I²C communication in noisy industrial environments with >0.3×VCC hysteresis on SCL/SDA |
| Hardware + Software Write Protection | WP pin blocks all writes when high; software lock bits provide additional granularity for sector-level protection |
| 1 MHz I²C Compatibility | Supports high-speed configuration loading in real-time systems - e.g., FPGA bitstream metadata or sensor offset tables |
| Industrial Temperature Range | Validated operation from –40°C to +85°C - eliminates derating concerns in outdoor or factory-floor deployments |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Memory |
|---|---|
|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in manufacturing lines. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via I²C during boot and runtime parameter updates. Use Value: Enables field reconfiguration without firmware reflashing; 40-year retention ensures settings survive equipment lifecycle. |
Use Scenario: Holding calibrated sensor offsets (e.g., temperature, pressure) and device-specific correction coefficients in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for FDA-required calibration history and traceability data. Use Value: WP pin prevents accidental overwrites during service; 1M endurance supports repeated recalibration over device lifetime. |
| Automotive Body Control Module | Network Equipment Bootloader Parameters |
|
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock configurations in 12V automotive BCMs. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced to 3.3V MCU via I²C; powered from always-on battery rail. Use Value: 2.5V–5.5V operation tolerates battery voltage sag; -40°C rating ensures cold-start reliability. |
Use Scenario: Storing MAC addresses, firmware version stamps, and secure boot keys in enterprise switches and routers. IC Role / Device Role / Timing Role: Trusted configuration store accessed early in boot sequence before DRAM initialization. Use Value: 1 MHz I²C speed reduces boot latency; hardware WP prevents malicious firmware corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C512BN-SH25-T | Same 512K capacity and 2.5V–5.5V range, but in JEDEC SOIC (8S1) package - 0.150" width vs. 0.209" for AT24C512BW-SH25-T | JEDEC SOIC footprint differs; not PCB-replaceable without layout change due to lead pitch and body width mismatch | Select when JEDEC-compliant assembly or existing 8S1 land pattern is required |
| M24C512-RMN6TP | STMicroelectronics 512K I²C EEPROM; identical 2.5V–5.5V range and 1 MHz speed, but uses different write-protection scheme (software-only) | Lacks hardware WP pin - requires firmware-level lock management; no direct hardware disable path for critical safety zones | Choose when cost optimization is prioritized and hardware write lock is not mandated by system safety architecture |
Compared with AT24C512BW-SH25-T, AT24C512BN-SH25-T offers identical electrical behavior but requires PCB redesign for JEDEC SOIC, while M24C512-RMN6TP trades hardware write protection for lower unit cost and software-controlled security granularity.
Availability
AT24C512BW-SH25-T is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive body electronics requiring stable component supply, long-term obsolescence planning, and RoHS-compliant sourcing.
Supply support for AT24C512BW-SH25-T 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 qualification for the AT24C512B family.
The AT24C512B series was designed for high-reliability nonvolatile storage in resource-constrained embedded systems where low-power I²C interfacing, long data retention, and industrial temperature operation are mandatory.
FAQ
What is the maximum I²C clock frequency supported by AT24C512BW-SH25-T?
The AT24C512BW-SH25-T supports up to 1 MHz I²C clock frequency when operated at 2.5V or 5.5V supply. At 1.8V, maximum frequency drops to 400 kHz. This 1 MHz capability enables faster configuration reads than standard 400 kHz EEPROMs, reducing boot time in time-critical systems using the AT24C512BW-SH25-T.
Does AT24C512BW-SH25-T include hardware write protection?
Yes, AT24C512BW-SH25-T includes a dedicated Write Protect (WP) pin. When WP is driven high (to VCC), all write operations - including byte, page, and erase - are inhibited. This hardware lock provides fail-safe protection against unintended firmware corruption, independent of MCU state or software bugs affecting the AT24C512BW-SH25-T.
What package type is used for AT24C512BW-SH25-T?
AT24C512BW-SH25-T uses an 8-lead EIAJ SOIC package (code 8S2), measuring 0.209" wide with gull-wing leads and NiPdAu surface finish. This differs from JEDEC SOIC (8S1) and TSSOP (8A2) variants - board-level replacement requires matching land pattern and solder profile for the AT24C512BW-SH25-T's specific mechanical dimensions.
How many devices can share the same I²C bus with AT24C512BW-SH25-T?
Up to eight AT24C512BW-SH25-T devices can share a single I²C bus using the three hardware address pins A0, A1, and A2. Each pin can be hardwired to VCC or GND, generating a unique 3-bit address. Floating A0–A2 pins default to GND internally, but Atmel recommends explicit termination to avoid capacitive coupling issues in noisy environments around the AT24C512BW-SH25-T.
What is the endurance and data retention specification for AT24C512BW-SH25-T?
AT24C512BW-SH25-T guarantees 1,000,000 write cycles and 40 years of data retention at +25°C. These values are characterized and specified across the industrial temperature range (–40°C to +85°C), making the AT24C512BW-SH25-T suitable for applications requiring decades-long calibration stability without refresh, such as industrial sensors and medical instruments.
AT24C512BW-SH25-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 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-SOIC
AT24C512BW-SH25-T FAQ
1.How can I place an order for AT24C512BW-SH25-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C512BW-SH25-T 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-SH25-T reliable?
The price and inventory of AT24C512BW-SH25-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C512BW-SH25-T is usually 5 days.
3.What payment methods are accepted for AT24C512BW-SH25-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C512BW-SH25-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C512BW-SH25-T?
AT24C512BW-SH25-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C512BW-SH25-T 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-SH25-T?
For technical support, including AT24C512BW-SH25-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C512BW-SH25-T requirements.
6.How does Aetrix verify that AT24C512BW-SH25-T is sourced from the original manufacturer or authorized distributors?
All AT24C512BW-SH25-T 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-SH25-T meets industry standards.
7.What is the process for return or replacement of AT24C512BW-SH25-T?
All AT24C512BW-SH25-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C512BW-SH25-T, 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-SH25-T part is unused and in its original packaging.
Return procedure for AT24C512BW-SH25-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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