Microchip Technology 24LC512T-E/ST14

Overview

24LC512T-E/ST14 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 400 kHz max clock frequency, 1 µA standby current, and 128-byte page write buffer. It supports industrial and extended temperature ranges (–40°C to +125°C) and is housed in a 14-lead TSSOP package with hardware write-protection via the WP pin.

For engineers reviewing the 24LC512T-E/ST14 datasheet, 24LC512T-E/ST14 pinout, 24LC512T-E/ST14 application, or 24LC512T-E/ST14 equivalent, key selection criteria include its 2.5V minimum V_CC, E-temp qualification, 14-lead TSSOP footprint, cascading support for up to eight devices on one bus, and self-timed 5 ms max page write cycle.

Technical Context

The 24LC512T-E/ST14 implements a two-wire I²C interface with Schmitt-trigger inputs on SDA/SCL for noise immunity and slope-controlled outputs to suppress ground bounce. Its internal address counter enables sequential reads across the full 512 Kbit boundary, while A0–A2 pins provide hardware-selectable device addressing for multi-device bus configurations.

It uses low-power CMOS technology with active read current ≤400 µA and standby current ≤1 µA (I-temp) or ≤5 µA (E-temp), and integrates a 128-byte page latch for efficient burst writes. Write protection is enforced by the WP pin, sampled at the Stop bit of each write command, and data retention exceeds 200 years.

Key Specifications

Pinout & Package

24LC512T-E/ST14 is packaged in a 14-lead Thin Shrink Small Outline Package (TSSOP), with pin 1 marked by a notch or dot. The package provides thermal and mechanical robustness for reflow-soldered PCBs in extended-temperature environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC512T-E/ST14, the 24LC512-I/ST offers identical functionality at lower cost but sacrifices extended temperature capability, while AT24C512BN-SH-B provides higher speed and wider voltage range but lacks automotive qualification and requires layout change - making 24LC512T-E/ST14 optimal for AEC-Q100-compliant, high-ambient deployments.

Availability

24LC512T-E/ST14 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLCs, medical infusion pumps, and smart energy metering systems requiring stable component supply across extended temperature and long product lifecycles.

Supply support for 24LC512T-E/ST14 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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC512T-E/ST14 belongs to Microchip's 24XX512 family of I²C serial EEPROMs, designed specifically for automotive, industrial, and medical applications demanding extended temperature operation, high reliability, and AEC-Q100 compliance.

FAQ

What is the maximum clock frequency supported by the 24LC512T-E/ST14?

The 24LC512T-E/ST14 supports a maximum I²C clock frequency of 400 kHz when V_CC is 2.5V or higher. It does not support 1 MHz operation - that capability is exclusive to the 24FC512 variant. This 400 kHz limit ensures robust timing margins in electrically noisy automotive and industrial environments where the 24LC512T-E/ST14 is typically deployed.

Does the 24LC512T-E/ST14 require external pull-up resistors on SDA and SCL lines?

Yes, the 24LC512T-E/ST14 requires external pull-up resistors on both SDA and SCL lines because it uses open-drain outputs. For 400 kHz operation, a typical value is 2 kΩ to V_CC; for 100 kHz, 10 kΩ is recommended. These resistors ensure proper signal rise times and bus contention avoidance in multi-device I²C configurations.

How does hardware write-protection work on the 24LC512T-E/ST14?

Hardware write-protection on the 24LC512T-E/ST14 is controlled by the WP pin: when tied to V_CC, all write operations (byte and page) are inhibited while reads remain fully functional. The WP state is sampled only at the Stop condition of each write command, so toggling WP mid-transaction has no effect - ensuring deterministic protection behavior during critical configuration updates.

What is the page size and maximum page write length for the 24LC512T-E/ST14?

The 24LC512T-E/ST14 has a fixed 128-byte page size and supports page writes of up to 128 bytes in a single I²C transaction. Writing across a physical page boundary causes wraparound within the same page - software must align page writes to 128-byte boundaries (addresses 0x0000, 0x0080, etc.) to avoid unintended data overwrite.

Is the 24LC512T-E/ST14 qualified for automotive applications?

Yes, the 24LC512T-E/ST14 is AEC-Q100 qualified and rated for the extended temperature range of –40°C to +125°C, making it suitable for automotive applications including body control modules, infotainment systems, and ADAS subsystems where reliability under thermal stress is mandatory.