Microchip Technology 24LC512-E/ST14

Overview

24LC512-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 industrial/extended temperature support (–40°C to +125°C). It features hardware write-protection, 128-byte page write buffer, and Schmitt-trigger inputs for noise immunity in embedded control and data logging systems.

For engineers reviewing the 24LC512-E/ST14 datasheet, 24LC512-E/ST14 pinout, 24LC512-E/ST14 application, or 24LC512-E/ST14 equivalent, this page delivers verified electrical specs, package mapping to 14-lead TSSOP, I²C timing constraints at 2.5–5.5V, endurance (1M cycles), and real-world use cases in automotive infotainment and industrial sensor nodes.

Technical Context

The 24LC512-E/ST14 implements a two-wire I²C interface with open-drain SDA/SCL pins, internal address pointer for sequential reads, and cascading support for up to eight devices via A0–A2 chip-select inputs. Its EEPROM array uses self-timed erase/write cycles with automatic page boundary handling.

It integrates Schmitt-trigger inputs on SDA/SCL (hysteresis ≥0.05 VCC) and slope-controlled outputs to suppress ground bounce. Write protection is controlled solely by the WP pin state at Stop condition sampling-no internal register configuration required.

Key Specifications

Pinout & Package

24LC512-E/ST14 is packaged in a 14-lead Thin Shrink Small Outline Package (TSSOP), with exposed pad option not applicable. Pin 1 is A0; pins 9–14 are NC (no connect) and must remain unconnected in PCB layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC512-E/ST14, the 24AA512-I/ST14 offers wider voltage range at the cost of extended temperature capability, while the AT24C512-10TU-2.7 trades package compatibility and temp grade for higher clock speed-making each alternative optimal only under specific system-level constraints.

Availability

24LC512-E/ST14 is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and medical diagnostic devices requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24LC512-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 24LC512 belongs to Microchip's serial EEPROM product line, engineered for robust nonvolatile data storage in automotive, industrial, and medical systems where reliability, endurance, and AEC-Q100 qualification are mandatory.

FAQ

What is the maximum I²C clock frequency supported by the 24LC512-E/ST14?

The 24LC512-E/ST14 supports up to 400 kHz I²C clock frequency when VCC is 2.5V or higher. At voltages below 2.5V, the maximum clock drops to 100 kHz. This specification is confirmed in the Device Selection Table and AC Characteristics section of DS20001754Q, and applies specifically to the 24LC512 variant-not the 24FC512 (which supports 1 MHz). The 24LC512-E/ST14 must be operated within these limits to ensure reliable acknowledge timing and data validity.

Does the 24LC512-E/ST14 support write protection at the page level?

No, the 24LC512-E/ST14 provides only hardware-based full-array write protection via the WP pin-when tied to VCC, all write operations (byte and page) are inhibited. There is no internal register or software command to enable partial or page-level protection. This behavior is explicitly defined in Section 6.3 ("Write Protection") of DS20001754Q and applies uniformly across all 24XX512 variants. The 24LC512-E/ST14 does not implement block locking or sector protection features.

What is the pin 1 marking and orientation for the 24LC512-E/ST14 in 14-lead TSSOP?

In the 14-lead TSSOP package, pin 1 of the 24LC512-E/ST14 is the A0 input, located at the top-left corner when the notch or dot marking is oriented at the top-left of the package. Per Microchip's packaging drawing C04-057-SN Rev F, the device uses standard JEDEC TSSOP pin numbering: pins 1–7 on the top row (left to right), pins 8–14 on the bottom row (right to left), with pin 8 directly below pin 1. The 24LC512-E/ST14 marking includes "24LC512" followed by "E" (Extended temp) and "ST14" (14-lead TSSOP).

Can the 24LC512-E/ST14 be used in a 1.8V system?

No, the 24LC512-E/ST14 requires a minimum VCC of 2.5V and is not rated for 1.8V operation. Attempting to power it at 1.8V will result in undefined behavior, failed writes, or inability to acknowledge I²C commands. For 1.8V systems, Microchip's 24AA512 (1.7V–5.5V) or 24FC512 (1.7V–5.5V, 1 MHz) variants are appropriate alternatives. The 24LC512-E/ST14 datasheet explicitly states "2.5–5.5V" in the Device Selection Table and Electrical Characteristics sections.

How many devices can be connected on the same I²C bus using the 24LC512-E/ST14?

Up to eight 24LC512-E/ST14 devices can share a single I²C bus using the A0, A1, and A2 address inputs to generate unique 3-bit chip addresses (1010xxx). Each device must have a distinct combination of A0–A2 tied to VSS or VCC; floating these pins is not permitted. This cascading capability enables up to 4 Mbit total addressable memory (8 × 512 Kbit) without additional address decoding logic, as confirmed in Section 2.1 and Figure 5-1 of DS20001754Q.