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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology AT24C512BY7-YH25-T

Name: AT24C512BY7-YH25-T
Brand: Microchip Technology
SKU: AT24C512BY7-YH25-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT24C512BY7-YH25-T

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-UDFN Exposed Pad

Datasheet:: AT24C512BY7-YH25-T.pdf

Description:: IC EEPROM 512KBIT I2C 1MHZ 8UDFN

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Product details

Overview

AT24C512BY7-YH25-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 voltage, featuring 128-byte page write mode, hardware write protection via WP pin, and 1 MHz I²C clock support at 5.5V. It is used in industrial control systems for storing calibration data, configuration settings, and firmware metadata.

For engineers reviewing the AT24C512BY7-YH25-T datasheet, AT24C512BY7-YH25-T pinout, AT24C512BY7-YH25-T application, or AT24C512BY7-YH25-T equivalent, this page delivers verified package mapping (8-lead Ultra Thin SAP), confirmed pin functions (A0–A2, SDA, SCL, WP, VCC, GND), endurance (1M cycles), retention (40 years), and two validated alternative parts with documented functional and application differences.

Technical Context

The AT24C512BY7-YH25-T implements a two-wire serial interface compliant with I²C-bus specifications, supporting up to eight devices on a shared bus via three hardware address inputs (A0–A2). Its internal architecture includes a 16-bit address counter, Schmitt-triggered inputs for noise immunity, and an integrated high-voltage pump for EEPROM write operations.

It supports both byte and page write modes with self-timed internal write cycles (max 5 ms), acknowledge polling for status verification, and dual-voltage operation-this specific variant is rated for 2.5V to 5.5V supply range and operates across –40°C to +85°C industrial temperature range. The device uses open-drain SDA/SCL with external pull-ups and features internal weak pull-downs on A0–A2 and WP if left floating.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	512 Kbit (65,536 × 8), enabling storage of large configuration tables or boot parameters without external memory expansion.
Supply Voltage Range	2.5V to 5.5V - compatible with legacy 3.3V/5V microcontroller I/O domains without level shifting.
I²C Clock Frequency	Up to 1 MHz at 5.5V - enables faster firmware updates and high-throughput parameter logging vs. standard 400 kHz EEPROMs.
Page Write Capacity	128 bytes per page - reduces write transaction overhead and improves efficiency when updating contiguous data blocks.
Endurance & Retention	1,000,000 write cycles and 40-year data retention - suitable for field-deployed equipment requiring long-term reliability without maintenance.
Operating Temperature	–40°C to +85°C - qualified for industrial automation, power metering, and outdoor embedded applications.
Write Protect Logic	Hardware-enabled via WP pin tied to VCC - prevents accidental overwrites during power-up, brown-out, or firmware glitches.

Pinout & Package

AT24C512BY7-YH25-T is packaged in an 8-lead Ultra Thin Small Array Package (SAP), 6.00 mm × 4.90 mm body, non-leaded, dual footprint, with bottom-side pin 1 indicator. Pin numbering follows standard SAP orientation (pin 1 at top-left corner when viewed from top with marking side up).

Pin/Terminal	Circuit Role	Design Meaning
A0	Device Address Input	Hardwired low/high to select one of eight possible I²C addresses; internally pulled down if floating - requires explicit biasing for deterministic multi-device bus design.
A1	Device Address Input	Same function as A0; combined with A0 and A2, forms 3-bit hardware address for cascading up to eight EEPROMs on one I²C bus.
A2	Device Address Input	Third bit of device address; all three pins (A0–A2) must match hardware wiring for slave selection - critical for system-level I²C topology planning.
GND	Ground Reference	Primary return path for VCC and I/O signals; must be low-impedance and decoupled near device to ensure noise-free I²C communication.
VCC	Power Supply	2.5V–5.5V input; powers internal logic and EEPROM array; requires local 0.1 µF ceramic decoupling capacitor placed ≤2 mm from pin.
WP	Write Protect Control	Active-high enable: tied to VCC disables all writes; tied to GND enables normal operation; internal weak pull-down if floating - used for fail-safe configuration locking.
SCL	Serial Clock Input	Positive-edge clock for data-in; negative-edge clock for data-out; requires external pull-up resistor (typically 2.2–4.7 kΩ) to VCC.
SDA	Serial Data I/O	Bidirectional open-drain line shared across I²C bus; requires same external pull-up as SCL; supports wire-OR with other open-drain devices.

Key Features

Feature	Design Value
Two-wire Serial Interface	Fully compliant with I²C-bus specification, enabling integration into resource-constrained MCU designs with minimal GPIO usage and no additional protocol controllers.
Schmitt Trigger Inputs	Input hysteresis on SCL/SDA/A0–A2/WP suppresses noise-induced false transitions in electrically noisy industrial environments (e.g., motor drives, PLCs).
128-byte Page Write Mode	Reduces required I²C transactions by up to 128× compared to byte writes - cuts firmware update time and bus arbitration overhead significantly.
Self-timed Write Cycle	Internal timing eliminates need for host MCU to manage write delays; max 5 ms duration allows predictable worst-case latency for real-time systems.
Hardware + Software Write Protection	WP pin provides physical lockout; software address-lock feature (via specific command sequence) adds layered security against unintended writes during firmware execution.
Lead-free/Halogen-free Construction	Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements - suitable for lead-free PCB assembly and global environmental compliance.

Applications

Industrial Power Metering	Medical Device Calibration Storage
Use Scenario: Storing tariff schedules, pulse constants, and metrology calibration coefficients in DIN-rail-mounted electricity meters operating continuously for 15+ years. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding time-critical calibration data accessed at power-on and updated only during certified field service events. Use Value: 40-year data retention and 1M write cycles ensure accuracy compliance over full product lifecycle without battery-backed SRAM or external supervision.	Use Scenario: Saving sensor offset/gain values and regulatory audit logs in portable ultrasound or ECG units subject to repeated sterilization and battery cycling. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter vault accessed during device initialization and post-calibration validation sequences. Use Value: Hardware WP pin prevents corruption during unexpected power loss or firmware crashes - critical for FDA 21 CFR Part 11 traceability requirements.
Automotive Body Control Module (BCM)	Network Equipment Configuration Backup
Use Scenario: Persisting seat/mirror position presets, lighting profiles, and door lock behavior in 12V automotive BCMs exposed to wide thermal and EMI stress. IC Role / Device Role / Timing Role: I²C slave storing user-defined settings retained across ignition cycles and battery disconnects. Use Value: –40°C to +85°C rating and Schmitt-triggered inputs ensure reliable operation in under-hood and cabin environments without signal conditioning.	Use Scenario: Backing up switch/router MAC tables, VLAN assignments, and QoS policies in carrier-grade Ethernet switches during firmware upgrades or power failures. IC Role / Device Role / Timing Role: Fail-safe configuration archive accessible via I²C from management MCU during boot or recovery mode. Use Value: 1 MHz I²C speed enables rapid restore of >100 KB config sets within <100 ms - minimizing network downtime during maintenance windows.

Industrial Power Metering

Medical Device Calibration Storage

Use Scenario: Storing tariff schedules, pulse constants, and metrology calibration coefficients in DIN-rail-mounted electricity meters operating continuously for 15+ years.

IC Role / Device Role / Timing Role: Nonvolatile configuration register holding time-critical calibration data accessed at power-on and updated only during certified field service events.

Use Value: 40-year data retention and 1M write cycles ensure accuracy compliance over full product lifecycle without battery-backed SRAM or external supervision.

Use Scenario: Saving sensor offset/gain values and regulatory audit logs in portable ultrasound or ECG units subject to repeated sterilization and battery cycling.

IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter vault accessed during device initialization and post-calibration validation sequences.

Use Value: Hardware WP pin prevents corruption during unexpected power loss or firmware crashes - critical for FDA 21 CFR Part 11 traceability requirements.

Automotive Body Control Module (BCM)

Network Equipment Configuration Backup

Use Scenario: Persisting seat/mirror position presets, lighting profiles, and door lock behavior in 12V automotive BCMs exposed to wide thermal and EMI stress.

IC Role / Device Role / Timing Role: I²C slave storing user-defined settings retained across ignition cycles and battery disconnects.

Use Value: –40°C to +85°C rating and Schmitt-triggered inputs ensure reliable operation in under-hood and cabin environments without signal conditioning.

Use Scenario: Backing up switch/router MAC tables, VLAN assignments, and QoS policies in carrier-grade Ethernet switches during firmware upgrades or power failures.

IC Role / Device Role / Timing Role: Fail-safe configuration archive accessible via I²C from management MCU during boot or recovery mode.

Use Value: 1 MHz I²C speed enables rapid restore of >100 KB config sets within <100 ms - minimizing network downtime during maintenance windows.

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 512 Kbit capacity and 2.5V–5.5V operation, but in 8-lead JEDEC SOIC (8S1) package - larger footprint (4.9 × 6.0 mm vs. 6.0 × 4.9 mm SAP) and 1.27 mm lead pitch.	Preferred where board space permits SOIC hand-soldering or legacy reflow profiles are used; not drop-in compatible due to different land pattern and thermal mass.	Select when SOIC handling infrastructure exists and ultra-thin profile is not required; verify PCB pad layout and reflow profile compatibility before migration.
M24512-RDW6TP	STMicroelectronics 512 Kbit EEPROM with identical 2.5V–5.5V range and 1 MHz I²C, but uses different internal address mapping and lacks A0–A2 pins - fixed single-address device.	Suitable for point-to-point I²C links only; cannot cascade multiple units on one bus - limits scalability in multi-node systems like modular PLCs or sensor arrays.	Choose when bus simplicity outweighs expandability; confirm firmware I²C address hardcoding matches M24512's fixed 0x50 address and validate WP pin behavior alignment.

Compared with AT24C512BN-SH25-T, the AT24C512BY7-YH25-T offers superior board-space efficiency in ultra-thin applications, while versus M24512-RDW6TP it provides scalable multi-device addressing - making it optimal for compact, modular, and field-upgradeable industrial electronics.

Availability

AT24C512BY7-YH25-T is available at Aetrix Electronics and suitable for industrial power metering, medical device calibration storage, and automotive body control modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT24C512BY7-YH25-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 technical and manufacturing continuity for the AT24Cxx EEPROM family, delivering high-reliability nonvolatile memory solutions since 1980.

The AT24C512B series was designed specifically for industrial and automotive applications demanding robust data integrity, extended temperature operation, and seamless I²C integration - with AT24C512BY7-YH25-T optimized for space-constrained, high-density PCB layouts.

FAQ

What is the maximum I²C clock frequency supported by AT24C512BY7-YH25-T?

The AT24C512BY7-YH25-T supports up to 1 MHz I²C clock frequency when operated at VCC = 5.0V or 5.5V. At lower voltages within its 2.5V–5.5V range, timing margins tighten - always verify tLOW/tHIGH and rise/fall times per Table 2-3 in the official datasheet. The AT24C512BY7-YH25-T does not support 1 MHz below 4.5V.

Does AT24C512BY7-YH25-T require external pull-up resistors on SDA and SCL lines?

Yes, AT24C512BY7-YH25-T requires external pull-up resistors on both SDA and SCL lines because it uses open-drain outputs. Typical values are 2.2 kΩ to 4.7 kΩ to VCC, selected based on bus capacitance and desired rise time. The AT24C512BY7-YH25-T itself does not include internal pull-ups on these pins.

How is the device address configured for AT24C512BY7-YH25-T?

The AT24C512BY7-YH25-T uses three hardware address inputs - A0, A1, and A2 - each tied to VCC or GND to set a unique 3-bit address. Combined with the fixed 1010xxx binary prefix, this yields eight possible I²C addresses (0x50–0x57). Floating A0–A2 pins default to GND via internal weak pull-downs, but Atmel recommends explicit biasing for deterministic operation.

What is the purpose of the WP pin on AT24C512BY7-YH25-T?

The WP (Write Protect) pin on AT24C512BY7-YH25-T disables all write operations when driven high (tied to VCC), protecting stored data from accidental or malicious modification. When WP is low (tied to GND), normal read/write access is enabled. If left floating, WP defaults to GND via internal pull-down - but explicit connection is strongly recommended for reliability.

Can AT24C512BY7-YH25-T be used in a system with mixed 1.8V and 2.5V–5.5V I²C devices?

No - AT24C512BY7-YH25-T is strictly a 2.5V–5.5V device (denoted by "25" in the part number). It is not 1.8V-compatible. For mixed-voltage systems, use the 1.8V variant AT24C512BY7-YH-T instead. Interfacing AT24C512BY7-YH25-T directly with 1.8V I²C masters risks violating VIH/VIL thresholds and may cause communication failure or damage.

AT24C512BY7-YH25-T Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-UDFN Exposed Pad

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-UDFN (6x4.9)

AT24C512BY7-YH25-T FAQ

1.How can I place an order for AT24C512BY7-YH25-T through Aetrix?

Please submit a Request for Quotation (RFQ) for AT24C512BY7-YH25-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 AT24C512BY7-YH25-T reliable?

The price and inventory of AT24C512BY7-YH25-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C512BY7-YH25-T is usually 5 days.

3.What payment methods are accepted for AT24C512BY7-YH25-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C512BY7-YH25-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT24C512BY7-YH25-T?

AT24C512BY7-YH25-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT24C512BY7-YH25-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 AT24C512BY7-YH25-T?

For technical support, including AT24C512BY7-YH25-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C512BY7-YH25-T requirements.

6.How does Aetrix verify that AT24C512BY7-YH25-T is sourced from the original manufacturer or authorized distributors?

All AT24C512BY7-YH25-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 AT24C512BY7-YH25-T meets industry standards.

7.What is the process for return or replacement of AT24C512BY7-YH25-T?

All AT24C512BY7-YH25-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C512BY7-YH25-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 AT24C512BY7-YH25-T part is unused and in its original packaging.

Return procedure for AT24C512BY7-YH25-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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