Microchip Technology 24LC014-E/ST

Overview

24LC014-E/ST from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory, operating from 2.5V to 5.5V with automotive-grade temperature range (–40°C to +125°C). It features hardware write protection via WP pin, 16-byte page write buffer, and supports up to 400 kHz clock frequency at V_CC ≥ 2.5V. It is used for nonvolatile parameter storage in automotive control modules requiring extended-temperature reliability.

For engineers reviewing the 24LC014-E/ST datasheet, 24LC014-E/ST pinout, 24LC014-E/ST application, or 24LC014-E/ST equivalent, this page delivers verified electrical specs, package-specific pin mapping, automotive-qualified endurance (1M cycles), data retention (>200 years), and I²C timing compliance per DS21809G.

Technical Context

The 24LC014-E/ST implements a standard two-wire I²C slave interface with fixed 7-bit address prefix '1010', three hardware address inputs (A0–A2), and dedicated Write-Protect (WP) input. Its internal architecture includes an on-chip page buffer enabling burst writes of up to 16 bytes within a single physical page boundary.

It uses self-timed internal write cycles (max 5 ms), Schmitt-trigger inputs on SDA/SCL for noise immunity, and supports acknowledge polling to detect write completion. The device operates exclusively as a slave and requires external pull-up resistors on SDA and SCL lines.

Key Specifications

Pinout & Package

24LC014-E/ST is supplied in a 6-lead SOT-23 package. This compact surface-mount package measures 2.9 mm × 1.6 mm × 1.1 mm and features gull-wing leads suitable for automated reflow assembly. The exposed pad is not present in SOT-23; no thermal pad connection required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA014-E/ST and AT24C01D-SSHM-T, the 24LC014-E/ST uniquely combines automotive temperature rating (–40°C to +125°C) with guaranteed 400 kHz I²C performance at 2.5V+, making it the only option qualified for high-reliability automotive subsystems requiring both extended thermal range and fast configuration access.

Availability

24LC014-E/ST is available at Aetrix Electronics and suitable for automotive control units, ADAS sensor modules, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24LC014-E/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 microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC014-E/ST belongs to Microchip's automotive-qualified serial EEPROM product line, designed specifically for reliable nonvolatile data storage in harsh-temperature automotive electronics where long-term data integrity and I²C interoperability are critical.

FAQ

What is the maximum I²C clock frequency supported by the 24LC014-E/ST?

The 24LC014-E/ST supports up to 400 kHz clock frequency when V_CC is 2.5V or higher. At voltages below 2.5V, the maximum clock rate drops to 100 kHz. This dual-speed capability ensures compatibility with both legacy and high-performance I²C masters. The 24LC014-E/ST datasheet (DS21809G) specifies timing parameters including THIGH, TLOW, and setup/hold times for both speed grades.

Does the 24LC014-E/ST have a write-protect pin, and how is it implemented?

Yes, the 24LC014-E/ST includes a dedicated Write-Protect (WP) pin (pin 7 in 8-pin packages; not present in SOT-23). When WP is pulled high to V_CC, the entire memory array is write-inhibited while read operations remain fully functional. In the 24LC014-E/ST SOT-23 variant (E/ST suffix), the WP function is not available - write protection must be managed via software address locking or external logic.

How many devices can be connected on the same I²C bus using the 24LC014-E/ST?

In the standard 8-pin package variants, up to eight 24LC014-E/ST devices can share one I²C bus using the three hardware address pins (A0, A1, A2). However, the 24LC014-E/ST in SOT-23 (E/ST) package lacks the A2 pin, limiting the count to four devices per bus. Each device requires a unique combination of A0/A1 states, and all must share identical V_CC and ground connections.

What is the page write size of the 24LC014-E/ST, and why does it matter?

The 24LC014-E/ST has a 16-byte page write buffer. This means up to 16 consecutive bytes can be written in a single I²C transaction, significantly reducing bus overhead compared to individual byte writes. Proper alignment within physical page boundaries (addresses 0x00–0x0F, 0x10–0x1F, etc.) is required - crossing a boundary causes wraparound, potentially overwriting earlier data in the same page.

Is the 24LC014-E/ST RoHS-compliant and lead-free?

Yes, the 24LC014-E/ST is Pb-free and RoHS-compliant per Microchip's packaging specifications. The "E/ST" suffix denotes the automotive-grade SOT-23 package with matte tin (Sn) plating per JEDEC J-STD-609. Full compliance documentation, including material declarations and test reports, is available through Microchip's quality portal and authorized distributors.