Microchip Technology 24LC512T-I/ST

Overview

24LC512T-I/ST from Microchip Technology Inc. is a 512 Kbit I²C-compatible serial EEPROM organized as 64K × 8-bit memory, operating from 2.5V to 5.5V with industrial temperature range (–40°C to +85°C), 400 kHz max clock frequency, and 128-byte page write buffer. It serves as nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.

For engineers reviewing the 24LC512T-I/ST datasheet, 24LC512T-I/ST pinout, 24LC512T-I/ST application, or 24LC512T-I/ST equivalent, key selection criteria include its hardware write-protect (WP) pin, Schmitt-trigger SDA/SCL inputs for noise immunity, 1 µA standby current, and cascading support for up to eight devices on one I²C bus.

Technical Context

The 24LC512T-I/ST implements a two-wire I²C interface with fixed 4-bit control code (1010b) and user-configurable A0–A2 address bits, enabling up to eight devices per bus. Its internal architecture includes a 128-byte page latch, HV generator for EEPROM programming, and memory control logic managing self-timed erase/write cycles.

It supports byte and page write operations with 5 ms maximum write cycle time, acknowledges only after completion of internal writes, and uses acknowledge polling to detect write completion. The device features slope-controlled outputs to suppress ground bounce and Schmitt-trigger inputs with 0.05 VCC hysteresis for robust noise rejection.

Key Specifications

Pinout & Package

24LC512T-I/ST is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard 150 mil body width and gull-wing leads. Pin 1 is marked with a notch or dot; package meets JEDEC MS-012AA standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 24LC512T-I/ST, the 24AA512T-I/ST offers lower-voltage operation at the cost of automotive qualification, while the AT24C512BN-SH-T delivers higher speed and wider VCC range but requires WP signal polarity adaptation - making each suitable for distinct system-level trade-offs.

Availability

24LC512T-I/ST is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, automotive electronics, and smart metering applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for 24LC512T-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 24LC512T-I/ST belongs to Microchip's 24XX512 family of I²C serial EEPROMs, designed specifically for robust, low-power nonvolatile storage in space-constrained embedded systems requiring high reliability and industrial temperature operation.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LC512T-I/ST?

The 24LC512T-I/ST requires a minimum supply voltage of 2.5V for guaranteed operation across its full industrial temperature range (–40°C to +85°C). Below 2.5V, functionality is not assured - unlike the 24AA512 variant which supports down to 1.7V. This 2.5V threshold ensures stable internal charge pump operation during EEPROM write cycles and reliable I²C communication at 400 kHz.

Does the 24LC512T-I/ST support 1 MHz I²C clock frequency?

No, the 24LC512T-I/ST does not support 1 MHz I²C clock frequency. Its maximum clock frequency is 400 kHz at VCC ≥ 2.5V. The 1 MHz capability is exclusive to the 24FC512 variant within the same family. Attempting 1 MHz operation with the 24LC512T-I/ST will result in timing violations, failed ACKs, and unreliable data transfer.

How many devices can be connected on the same I²C bus using the 24LC512T-I/ST?

Up to eight 24LC512T-I/ST devices can be connected on the same I²C bus using the three hardware address pins A0, A1, and A2. Each combination of logic levels (0 or 1) on these pins generates a unique 7-bit client address (1010xxx), allowing individual addressing without software arbitration. All devices share the same SDA and SCL lines, with no additional bus controllers required.

What happens when the WP pin of the 24LC512T-I/ST is tied to VCC?

When the WP pin of the 24LC512T-I/ST is tied to VCC, all write operations (byte and page) are inhibited - the device responds with ACK to write commands but performs no actual EEPROM programming. Read operations remain fully functional. This hardware-level protection prevents accidental or malicious overwrites during power transitions, firmware updates, or system resets, ensuring data integrity without software overhead.

Is the 24LC512T-I/ST AEC-Q100 qualified?

Yes, the 24LC512T-I/ST is AEC-Q100 qualified for automotive applications. The "I" in the part number denotes Industrial temperature grade (–40°C to +85°C), and Microchip explicitly lists AEC-Q100 qualification for the 24LC512 variant in the device selection table and features list. This qualification covers stress testing for temperature cycling, humidity, and electrical reliability - confirming suitability for body electronics and infotainment subsystems.