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Microchip Technology AT24C512B-TH25-T
- Part No.:
- AT24C512B-TH25-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C512B-TH25-T.pdf
- Description:
- IC EEPROM 512KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,395
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Product details
Overview
AT24C512B-TH25-T from Microchip Technology (formerly Atmel) is a 512 Kbit (65,536 × 8) two-wire serial EEPROM with 2.5V operation (2.5V–5.5V), 128-byte page write capability, 1 MHz I²C bus compatibility at 2.5V/5.5V, and hardware write protection via the WP pin. It supports up to eight devices on a shared bus using A0–A2 address inputs and is used in industrial control systems for parameter storage and firmware configuration.
For engineers reviewing the AT24C512B-TH25-T datasheet, AT24C512B-TH25-T pinout, AT24C512B-TH25-T application, or AT24C512B-TH25-T equivalent, key selection criteria include voltage range (2.5V–5.5V), TSSOP-8 package footprint, 1 MHz I²C timing compliance, 1,000,000 write endurance, and hardware-based data protection via the WP pin.
Technical Context
The AT24C512B-TH25-T implements a standard two-wire (I²C-compatible) interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain bidirectional data transfer. Its internal architecture features a 16-bit address counter, cascaded device addressing via A0–A2, and a self-timed write cycle with 5 ms maximum duration.
It supports three operational modes: byte write, page write (up to 128 bytes per transaction), and random/sequential read - all governed by START/STOP/ACK protocols. The WP pin enables hardware-level memory lockout when tied to VCC, while internally pulled-down address pins ensure deterministic default addressing if left unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (65,536 × 8), organized as 512 pages of 128 bytes each - enables efficient block-level updates without full-memory erase. |
| Supply Voltage | 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 - reduces firmware wait time during writes compared to 400 kHz parts, improving system responsiveness. |
| Write Endurance | 1,000,000 cycles - supports frequent calibration or logging use cases over product lifetime. |
| Data Retention | 40 years at 25°C - ensures long-term reliability for infrequently updated configuration data in deployed equipment. |
| Page Write Size | 128 bytes - allows partial-page writes and minimizes bus occupancy versus single-byte operations. |
| Standby Current | 2.0 µA at 2.5V - suitable for battery-backed or low-power always-on applications such as smart meters. |
Pinout & Package
AT24C512B-TH25-T is packaged in an 8-lead Thin Shrink Small Outline Package (TSSOP) with 4.4 mm body width, 0.65 mm lead pitch, and NiPdAu lead finish - optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hardwired address bits enabling up to eight AT24C512B devices on one I²C bus; internally pulled down if floating. |
| SDA | Serial Data I/O | Bidirectional open-drain line requiring 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 - defines I²C timing compliance. |
| WP | Write Protect Control | Hardware lock: logic high disables all writes; internal pull-down ensures safe default state if unconnected. |
| VCC | Power Supply | 2.5V–5.5V supply input; decoupling capacitor required near pin for noise immunity during write cycles. |
| GND | Ground Reference | Return path for all internal circuitry and I/O signals; must be low-impedance to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Two-wire Serial Interface | Fully compliant with I²C protocol including START/STOP/ACK handshaking - simplifies integration with ARM Cortex-M, PIC, and STM32 MCUs. |
| 128-byte Page Write Mode | Reduces average write time per byte by >90% vs. byte-write mode - critical for fast firmware update or sensor calibration storage. |
| Schmitt Trigger Inputs | Enables robust operation in electrically noisy environments (e.g., motor drives, industrial PLCs) without external signal conditioning. |
| Hardware Write Protection | WP pin provides fail-safe memory lock independent of software state - prevents accidental corruption during power transitions or resets. |
| 1 MHz Bus Speed (2.5V) | Accelerates bulk read/write transfers - cuts EEPROM access latency by 2.5× versus standard 400 kHz I²C peripherals. |
Applications
| Industrial Sensor Calibration Storage | Medical Device Configuration Memory |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog front-end sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter retention between power cycles; accessed during boot initialization and runtime recalibration. Use Value: Enables field-replaceable sensor modules with persistent calibration data, eliminating manual reprogramming after replacement. |
Use Scenario: Holding user-configurable therapy parameters (e.g., infusion rate limits, alarm thresholds) in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, low-power configuration store accessible via microcontroller I²C during setup and diagnostics. Use Value: Supports FDA-required audit trails and parameter persistence across battery swaps and firmware updates. |
| Telecom Line Card Identity Storage | Automotive Body Control Module Settings |
|
Use Scenario: Recording unique hardware identifiers (MAC, serial number, revision) and provisioning keys for optical line terminals. IC Role / Device Role / Timing Role: Read-only identity source during system enumeration; write-protected after initial programming. Use Value: Ensures traceability and secure boot chain integrity without exposing sensitive keys to host processor memory space. |
Use Scenario: Saving user preferences (mirror position, seat memory, lighting profiles) in automotive BCMs across ignition cycles. IC Role / Device Role / Timing Role: Low-quiescent-current nonvolatile memory accessed during wake-up sequence and sleep-mode maintenance. Use Value: Meets ISO 16750-2 automotive power-off leakage requirements (<5 µA) while retaining personalized settings. |
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 operation, but in JEDEC SOIC-8 (8S1) package - 5.0 mm × 6.2 mm vs. TSSOP's 3.0 mm × 6.4 mm footprint. | Preferred where board space permits larger package and hand-soldering or legacy reflow profiles are used. | Select AT24C512BN-SH25-T only if SOIC-8 mechanical compatibility or thermal mass requirements outweigh density needs. |
| M24512-RDW6TP | STMicroelectronics 512K EEPROM with identical 2.5V–5.5V range and 1 MHz speed, but uses different internal page buffer management and lacks A0–A2 address pins. | Requires redesign of I²C address mapping; no multi-device bus support without external multiplexing. | Choose M24512-RDW6TP only when sourcing diversification is mandatory and address flexibility is not required. |
Compared with AT24C512BN-SH25-T, the AT24C512B-TH25-T saves ~35% PCB area in TSSOP-8; versus M24512-RDW6TP, it retains native multi-drop addressing and proven interoperability with legacy Atmel firmware stacks.
Availability
AT24C512B-TH25-T is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, telecom infrastructure, and automotive body electronics requiring stable component supply, long-life data retention, and RoHS-compliant packaging.
Supply support for AT24C512B-TH25-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, qualification, and manufacturing continuity for the AT24Cxx EEPROM family.
The AT24C512B-TH25-T belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-voltage nonvolatile storage in space-constrained industrial and automotive applications where write endurance and data integrity are critical.
FAQ
What is the operating voltage range for the AT24C512B-TH25-T?
The AT24C512B-TH25-T operates from 2.5V to 5.5V, supporting both 3.3V and 5V logic systems without level translation. This dual-range capability ensures compatibility with legacy 5V microcontrollers and modern low-power 3.3V SoCs. The "25" suffix in the part number explicitly denotes the 2.5V–5.5V version, distinguishing it from the 1.8V variant.
Does the AT24C512B-TH25-T support multi-device I²C bus configurations?
Yes, the AT24C512B-TH25-T supports up to eight devices on a single I²C bus using its three hardware address inputs (A0, A1, A2). Each device is assigned a unique 3-bit address by hardwiring these pins to VCC or GND. This cascading capability eliminates the need for external I²C multiplexers in systems with multiple EEPROMs, reducing BOM cost and layout complexity.
How does the write protect (WP) pin function on the AT24C512B-TH25-T?
The WP pin on the AT24C512B-TH25-T provides hardware-level write inhibition: when pulled high to VCC, all write operations (byte and page) are blocked, preserving memory contents even during firmware errors or power glitches. When grounded, normal write functionality is enabled. Internally pulled down, the pin defaults to writable if left unconnected - though Microchip recommends explicit routing for reliability.
What is the maximum I²C clock frequency supported by the AT24C512B-TH25-T?
The AT24C512B-TH25-T supports up to 1 MHz I²C clock frequency when operated at 2.5V or 5.5V. This higher-speed mode reduces transaction time significantly versus standard 400 kHz EEPROMs - for example, writing a full 128-byte page takes ~1.3 ms at 1 MHz versus ~3.2 ms at 400 kHz. Timing compliance is verified per Table 2-3 in the official datasheet.
Is the AT24C512B-TH25-T compatible with standard I²C protocol implementations?
Yes, the AT24C512B-TH25-T implements a fully standard two-wire interface compliant with I²C specification v2.1, including START/STOP condition generation, 9-bit ACK/NACK handshaking, and 7-bit device addressing with R/W bit. It requires no proprietary drivers and works natively with Linux i2c-dev, Arduino Wire, and STM32 HAL_I2C libraries without modification.
AT24C512B-TH25-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not 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-TSSOP
AT24C512B-TH25-T FAQ
1.How can I place an order for AT24C512B-TH25-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C512B-TH25-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 AT24C512B-TH25-T reliable?
The price and inventory of AT24C512B-TH25-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C512B-TH25-T is usually 5 days.
3.What payment methods are accepted for AT24C512B-TH25-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C512B-TH25-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C512B-TH25-T?
AT24C512B-TH25-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C512B-TH25-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 AT24C512B-TH25-T?
For technical support, including AT24C512B-TH25-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C512B-TH25-T requirements.
6.How does Aetrix verify that AT24C512B-TH25-T is sourced from the original manufacturer or authorized distributors?
All AT24C512B-TH25-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 AT24C512B-TH25-T meets industry standards.
7.What is the process for return or replacement of AT24C512B-TH25-T?
All AT24C512B-TH25-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C512B-TH25-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 AT24C512B-TH25-T part is unused and in its original packaging.
Return procedure for AT24C512B-TH25-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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