Microchip Technology 24LC014H-E/ST

Overview

24LC014H-E/ST from Microchip Technology Inc. is a 1 Kbit (128 × 8) I²C-compatible serial EEPROM with automotive-grade temperature operation (−40°C to +125°C), 1 MHz maximum clock frequency, hardware write-protection for half-array (addresses 40h–7Fh), and ultra-low standby current of 1 μA. It operates from 2.5V to 5.5V and supports up to eight devices on a single bus via A0–A2 address pins - used in automotive body control modules for storing calibration data, configuration settings, and fault logs.

For engineers reviewing the 24LC014H-E/ST datasheet, 24LC014H-E/ST pinout, 24LC014H-E/ST application, or 24LC014H-E/ST equivalent, key selection criteria include its automotive temperature rating, 1 MHz I²C timing compliance, half-array hardware write-protect capability, page-write buffer (up to 16 bytes), and 1 million erase/write cycles with >200-year data retention.

Technical Context

The 24LC014H-E/ST implements a standard two-wire I²C interface with Schmitt-trigger inputs and output slope control to suppress noise and eliminate ground bounce. Its internal address counter enables sequential, random, and current-address read modes, while the page buffer allows burst writes within a 16-byte physical page boundary without crossing wrap-around.

Hardware write protection is controlled solely by the WP pin state (VCC = protected, VSS = disabled), independent of software commands. The device uses an internal high-voltage generator and auto-erase logic for self-timed byte/page write cycles (max 5 ms), and includes VCC threshold detection to inhibit writes below 1.5 V.

Key Specifications

Pinout & Package

24LC014H-E/ST is supplied in an 8-pin TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and Pb-free per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01C-SSHM-T and BR24G01NUX-3TR, the 24LC014H-E/ST uniquely delivers automotive temperature qualification *plus* dedicated hardware write protection - eliminating both environmental and firmware-layer failure modes in safety-critical storage applications.

Availability

24LC014H-E/ST is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and medical device manufacturing requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned sourcing.

Supply support for 24LC014H-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, FPGA, and memory solutions, serving automotive, industrial, and consumer markets with vertically integrated design and manufacturing.

The 24LC014H-E/ST belongs to Microchip's automotive-qualified serial EEPROM product line, engineered specifically for robust, low-power, long-life nonvolatile storage in harsh environments where data integrity and extended temperature operation are mandatory.

FAQ

What is the maximum I²C clock frequency supported by the 24LC014H-E/ST?

The 24LC014H-E/ST supports up to 1 MHz I²C clock frequency when VCC is between 2.5V and 5.5V. This is explicitly specified in the Device Selection Table and confirmed in AC Characteristics Table 1-2. Operation above 400 kHz is exclusive to the LC variant - the AA variant (24AA014H) is limited to 400 kHz. The 24LC014H-E/ST maintains full timing compliance at 1 MHz across its entire automotive temperature range (−40°C to +125°C).

How does hardware write protection work on the 24LC014H-E/ST?

Hardware write protection on the 24LC014H-E/ST is controlled exclusively by the WP pin: when tied to VCC, addresses 40h–7Fh (64 bytes) are locked against all write and erase operations; when tied to VSS, full-array writes are permitted. This protection is implemented in silicon and cannot be overridden by I²C commands. The 24LC014H-E/ST datasheet confirms that even if a write command targets a protected address, the device acknowledges the command but performs no memory change.

What packages are available for the 24LC014H-E/ST, and what does the "-E/ST" suffix indicate?

The 24LC014H-E/ST is packaged in an 8-pin TSSOP (Thin Shrink Small Outline Package), as indicated by the "/ST" suffix per Microchip's packaging nomenclature. The "-E" denotes the automotive temperature grade (−40°C to +125°C). Other available packages for the 24LC014H family include PDIP, SOIC, MSOP, and TDFN - but the -E/ST variant is specifically the TSSOP automotive version, verified in the Package Marking Information section and Device Selection Table.

Can multiple 24LC014H-E/ST devices share the same I²C bus? How many?

Yes, up to eight 24LC014H-E/ST devices can operate on the same I²C bus using the A0, A1, and A2 address pins to configure unique 3-bit chip select codes. Each pin must be hard-wired to either VSS or VCC to set a static address. The control byte format (1010 A2 A1 A0 R/W) defines this addressing scheme, and the datasheet explicitly states "Up to eight 24AA014H/24LC014H devices may be connected to the same bus." All devices must share identical VCC and ground references for reliable arbitration.

What is the write cycle time for the 24LC014H-E/ST, and how is it managed during operation?

The 24LC014H-E/ST has a maximum write cycle time of 5 ms for both byte and page writes, as specified in Table 1-1 (TWC parameter). During this time, the device does not acknowledge I²C commands - a behavior leveraged by acknowledge polling: the master repeatedly sends a Start + control byte (R/W=0) until an ACK is received, confirming write completion. This mechanism avoids fixed delays and maximizes bus utilization, and is fully documented in Section 7.0 of the datasheet.