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Microchip Technology 24AA512-I/ST
- Part No.:
- 24AA512-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24AA512-I/ST.pdf
- Description:
- IC EEPROM 512KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:467
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Product details
Overview
24AA512-I/ST from Microchip Technology is a 512 Kbit (64K × 8) I²C-compatible serial EEPROM with industrial temperature range (–40°C to +85°C), 1.7–5.5 V supply, and 400 kHz max clock frequency. It features 128-byte page write buffer, hardware write-protection via WP pin, and Schmitt-trigger inputs for noise immunity - deployed in embedded systems requiring nonvolatile parameter storage with low-power operation.
For engineers reviewing the 24AA512-I/ST datasheet, 24AA512-I/ST pinout, 24AA512-I/ST application, or 24AA512-I/ST equivalent, key selection criteria include its 1 µA standby current, 5 ms max page write time, I²C address flexibility (A0–A2), and SOIC-8 package compatibility with legacy board layouts.
Technical Context
The 24AA512-I/ST implements a two-wire I²C interface with open-drain SDA/SCL pins requiring external pull-ups, and supports cascaded bus configurations up to eight devices using A0–A2 address inputs. Its internal architecture includes a 128-byte page latch, HV generator for EEPROM programming, and memory control logic enabling byte/page writes and random/sequential reads across the full 512 Kbit address space.
Write protection is enforced by the WP pin: tied to VCC, it disables all write operations while permitting reads; sampling occurs at the Stop bit of each command. The device uses Schmitt-trigger inputs on SDA/SCL and slope-controlled outputs to suppress ground bounce and improve noise immunity in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8), organized as single block - enables compact firmware parameter tables or calibration data storage without external address decoding. |
| Supply Voltage | 1.7 V to 5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters. |
| I²C Clock Frequency | Up to 400 kHz (at VCC ≥ 2.5 V) - balances speed and noise immunity for industrial bus environments. |
| Page Write Buffer | 128 bytes - reduces host MCU overhead by allowing burst writes within a physical page boundary. |
| Endurance & Retention | 1 million erase/write cycles; >200 years data retention - suitable for field-updatable configuration storage in long-lifecycle equipment. |
| Standby Current | 1 µA maximum (I-temp) - critical for battery-backed or energy-harvesting applications where quiescent power must be minimized. |
| ESD Protection | >4000 V HBM - ensures robustness during handling and operation in electrostatic-prone industrial assembly lines. |
Pinout & Package
24AA512-I/ST is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package, designated "ST" in Microchip's packaging code - standard 150 mil width, surface-mount compatible, with 1.27 mm pitch and JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip Address Input | LSB of 3-bit hardware address; hardwired to VSS or VCC to select one of eight possible I²C addresses on shared bus. |
| A1 | Chip Address Input | Middle bit of chip address; determines device uniqueness in multi-EEPROM systems without software address remapping. |
| A2 | Chip Address Input | MSB of chip address; enables contiguous 4 Mbit expansion when cascading up to eight 24AA512-I/ST units. |
| VSS | Ground Reference | Return path for all internal circuitry and I/O; must be low-impedance connection to minimize noise coupling into SDA/SCL lines. |
| SDA | Serial Data I/O | Bidirectional open-drain line; requires external pull-up resistor (2–10 kΩ depending on bus speed); carries address, data, and ACK/NACK signals. |
| SCL | Serial Clock Input | Master-generated clock synchronizing all I²C transfers; Schmitt-trigger input ensures reliable edge detection under noisy conditions. |
| WP | Write-Protect Control | Active-high enable: tied to VCC blocks all write operations (byte/page) but allows unlimited reads - prevents accidental firmware corruption. |
| VCC | Power Supply | Single 1.7–5.5 V rail powers EEPROM core and I/O; no separate logic supply required. |
Key Features
| Feature | Design Value |
|---|---|
| Low-Voltage Operation | Functional down to 1.7 V - eliminates need for voltage regulators in 1.8 V systems, reducing BOM count and PCB area. |
| Page Write Capability | 128-byte buffer - cuts write transaction time by ~90% vs. individual byte writes, improving host MCU efficiency in data logging. |
| Hardware Write Protection | WP pin directly disables writes at silicon level - provides fail-safe protection against firmware bugs or malicious commands without software intervention. |
| Noise Immunity Design | Schmitt-trigger inputs + output slope control - suppresses EMI-induced glitches on SDA/SCL, eliminating spurious Start/Stop conditions in motor-drive or power-conversion environments. |
| Industrial Temperature Range | –40°C to +85°C operation - validated for use in outdoor metering, factory automation controllers, and automotive body electronics modules. |
Applications
| Smart Energy Metering | Industrial PLC Configuration |
|---|---|
Use Scenario: Storing tariff schedules, meter calibration constants, and tamper-event logs in utility-grade electricity meters operating unattended for 15+ years. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent system parameters; accessed via I²C during boot and runtime updates. Use Value: 1M endurance and >200-year retention ensure data integrity across full product lifecycle without replacement; 1.7 V operation supports brown-out resilience during grid fluctuations. | Use Scenario: Saving ladder logic configuration, I/O mapping, and alarm thresholds in programmable logic controllers deployed in manufacturing cells. IC Role / Device Role / Timing Role: Parameter storage peripheral interfaced to ARM Cortex-M host MCU; updated only during commissioning or maintenance windows. Use Value: Hardware WP pin prevents unintended writes during ESD events or firmware crashes; SOIC-8 package simplifies rework and conforms to IPC-7351 standards. |
| Medical Diagnostic Equipment | Automotive Body Control Module |
Use Scenario: Archiving sensor calibration coefficients, user preferences, and diagnostic fault history in portable ultrasound or blood glucose analyzers. IC Role / Device Role / Timing Role: Secure, low-power nonvolatile memory for FDA-regulated device settings; accessed during power-up and after self-test sequences. Use Value: RoHS compliance and AEC-Q100 qualification (shared family) support medical and automotive supply chain traceability; 1 µA standby current extends battery life in handheld units. | Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in vehicle body control units subject to wide thermal cycling. IC Role / Device Role / Timing Role: Dedicated EEPROM for user-configurable settings; isolated from main CAN/FlexRay networks to avoid interference. Use Value: –40°C to +85°C rating matches under-hood ambient specs; 4 kV ESD protection withstands assembly-line handling and service technician contact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC512-I/ST | Requires minimum 2.5 V VCC; same 400 kHz max clock and SOIC-8 package. | Not suitable for 1.8 V systems; otherwise functionally identical in industrial temp range. | Select only if design already operates at ≥2.5 V and legacy 24LC512 qualification is required. |
| AT24C512-10PU-2.7 | Atmel/ Microchip (post-acquisition) variant; 2.7–5.5 V supply; 1 MHz max clock; different pinout (PDIP-8). | Higher speed but incompatible package; requires PCB redesign and layout validation. | Choose for higher throughput in 3.3 V/5 V systems where SOIC-8 is not mandatory and 1 MHz timing is needed. |
Compared with 24LC512-I/ST, the 24AA512-I/ST enables lower-voltage operation critical for modern ultra-low-power designs, while the AT24C512-10PU-2.7 offers faster I²C performance at the cost of package incompatibility - making 24AA512-I/ST the optimal choice for drop-in upgrades in existing 1.8 V–3.3 V SOIC-based platforms.
Availability
24AA512-I/ST is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical diagnostics, and automotive body control modules requiring stable component supply across extended production lifecycles.
Supply support for 24AA512-I/ST 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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 24AA512 belongs to Microchip's serial EEPROM product line, engineered specifically for reliable, low-power nonvolatile data storage in industrial, automotive, and medical applications where long-term data integrity and robust bus communication are essential.
FAQ
What is the maximum I²C clock frequency supported by the 24AA512-I/ST?
The 24AA512-I/ST supports up to 400 kHz I²C clock frequency when VCC is 2.5 V or higher. At VCC below 2.5 V (e.g., 1.8 V), the maximum clock rate drops to 100 kHz per Microchip DS20001754Q specification. This dual-speed capability ensures interoperability across mixed-voltage systems while maintaining signal integrity.
Does the 24AA512-I/ST require external pull-up resistors on SDA and SCL lines?
Yes, the 24AA512-I/ST requires external pull-up resistors on both SDA and SCL because these pins are open-drain. Recommended values are 10 kΩ for 100 kHz operation, 2 kΩ for 400 kHz, and lower values may be needed for longer traces or higher noise environments - all defined in the 24AA512-I/ST datasheet section 2.2 and Figure 4-1.
How does the WP pin function on the 24AA512-I/ST?
The WP (Write-Protect) pin on the 24AA512-I/ST is sampled at the Stop bit of each I²C command. When tied to VCC, it disables all write operations (byte and page) while permitting unlimited read access. When tied to VSS, full read/write functionality is enabled. This hardware-level protection prevents accidental overwrites without firmware involvement.
What is the page size and write time for the 24AA512-I/ST?
The 24AA512-I/ST has a 128-byte page write buffer and a maximum page write time of 5 ms. During a page write, up to 128 bytes can be loaded into the buffer and committed to EEPROM memory simultaneously upon receipt of the Stop condition - significantly reducing total programming time versus sequential byte writes.
Is the 24AA512-I/ST AEC-Q100 qualified?
While the 24AA512-I/ST itself is specified for Industrial temperature range (–40°C to +85°C), the broader 24XX512 family - including 24AA512 - is explicitly stated as "Automotive AEC-Q100 Qualified" in the device selection table of DS20001754Q. This qualification applies to the same die and process, supporting automotive body electronics use cases.
24AA512-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
24AA512-I/ST FAQ
1.How can I place an order for 24AA512-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA512-I/ST 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 24AA512-I/ST reliable?
The price and inventory of 24AA512-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24AA512-I/ST is usually 5 days.
3.What payment methods are accepted for 24AA512-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA512-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA512-I/ST?
24AA512-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA512-I/ST 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 24AA512-I/ST?
For technical support, including 24AA512-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA512-I/ST requirements.
6.How does Aetrix verify that 24AA512-I/ST is sourced from the original manufacturer or authorized distributors?
All 24AA512-I/ST 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 24AA512-I/ST meets industry standards.
7.What is the process for return or replacement of 24AA512-I/ST?
All 24AA512-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24AA512-I/ST, 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 24AA512-I/ST part is unused and in its original packaging.
Return procedure for 24AA512-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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