Microchip Technology 24LC025T-I/OT

Overview

24LC025T-I/OT from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory, operating from 2.5V to 5.5V with industrial temperature range (−40°C to +85°C), 400 kHz max clock, and 16-byte page write buffer. It supports up to eight devices on one bus via A0–A2 address pins and features Schmitt-trigger inputs for noise immunity in embedded control and sensor calibration applications.

For engineers reviewing the 24LC025T-I/OT datasheet, 24LC025T-I/OT pinout, 24LC025T-I/OT application, or 24LC025T-I/OT equivalent, key selection criteria include its SOT-23-6 package, absence of hardware write-protect (WP not connected), 5 ms max page write time, and compatibility with standard I²C master controllers requiring low-voltage, low-power nonvolatile storage.

Technical Context

The 24LC025T-I/OT implements a two-wire I²C interface with open-drain SDA/SCL lines, internal address pointer auto-increment, and self-timed erase/write cycles. Its memory array is accessed via 7-bit slave address (1010xxx0/1) with three chip-select bits (A2–A0), where A2 is unconnected in the SOT-23 package - limiting cascading to four devices per bus.

It uses low-power CMOS technology with typical standby current of 1 μA and active read current of 1 mA, integrated Schmitt-trigger inputs and output slope control to suppress ground bounce and ESD transients (>4 kV), and a voltage threshold detector disabling write logic below 1.5 V to prevent data corruption during brown-out conditions.

Key Specifications

Pinout & Package

24LC025T-I/OT is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm). The WP pin is not internally connected - hardware write protection is unavailable. Pin 1 is marked by laser dot; pin numbering follows standard SOT-23 orientation (counterclockwise from mark).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC025T-I/OT, the 24AA025T-I/OT extends voltage range downward for battery-sensitive designs, while the AT24C02-SSHM-T trades compactness for robust hardware write protection and broader vendor support - making each suitable for distinct system-level trade-offs in power, security, and layout constraints.

Availability

24LC025T-I/OT is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, smart sensor modules, and consumer IoT devices requiring stable component supply across multi-year production cycles.

Supply support for 24LC025T-I/OT 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 infrastructure.

The 24LC025T-I/OT belongs to Microchip's serial EEPROM product line, engineered for cost-effective, low-power nonvolatile data storage in space-constrained embedded systems where I²C interface simplicity and industrial reliability are critical.

FAQ

What is the function of the WP pin on the 24LC025T-I/OT?

The WP (Write-Protect) pin on the 24LC025T-I/OT is not internally connected - it serves no functional purpose. This distinguishes it from the 24LC024 variant, which uses WP for hardware-level array protection. For the 24LC025T-I/OT, write protection must be implemented in firmware or via I²C bus arbitration. Always confirm this behavior in the DS21210N datasheet section 2.4.

Can the 24LC025T-I/OT operate at 1.8V?

No, the 24LC025T-I/OT has a minimum VCC of 2.5V, as specified in the Device Selection Table. Operating below this violates absolute maximum ratings and may cause unpredictable read/write failures or data corruption. For 1.7V–1.8V operation, consider the pin-compatible 24AA025T-I/OT instead - both share the SOT-23-6 package and 2 Kbit organization.

How many 24LC025T-I/OT devices can be connected on a single I²C bus?

Up to four 24LC025T-I/OT devices can share one I²C bus. Unlike the 8-pin variants, the SOT-23-6 package omits the A2 pin, leaving only A0 and A1 for chip select - yielding 2² = 4 unique addresses (00, 01, 10, 11). Attempting to connect more than four will result in address collisions and communication failure.

What is the maximum page write size for the 24LC025T-I/OT?

The 24LC025T-I/OT supports a maximum page write size of 16 bytes. Writes exceeding this limit wrap around within the same physical page (addresses 0x00–0x0F, 0x10–0x1F, etc.), overwriting earlier data. Firmware must enforce page boundaries - for example, splitting a 20-byte update across two page writes starting at 0x00 and 0x10 - to avoid unintended data loss.

Does the 24LC025T-I/OT support both 100 kHz and 400 kHz I²C clock speeds?

Yes, the 24LC025T-I/OT supports 400 kHz fast-mode operation across its full 2.5V–5.5V VCC range. Unlike some EEPROMs requiring voltage-dependent clock scaling, it does not fall back to 100 kHz below 2.5V - because its minimum VCC is 2.5V. This guarantees consistent high-speed performance in all valid operating conditions.