Microchip Technology 24C00T-E/OT

Overview

24C00T-E/OT from Microchip Technology Inc. is a 128-bit (16 × 8) I²C-compatible serial EEPROM designed for low-power, space-constrained applications requiring nonvolatile storage of calibration data, device IDs, or manufacturing traceability. It operates at 4.5–5.5 V, supports 100 kHz and 400 kHz clock rates, features Schmitt-trigger inputs for noise immunity, and delivers typical standby current of 100 nA and read current of 500 µA. Its 5-lead SOT-23 package enables compact integration in automotive and industrial control modules.

For engineers reviewing the 24C00T-E/OT datasheet, 24C00T-E/OT pinout, 24C00T-E/OT application, or 24C00T-E/OT equivalent, key selection criteria include its automotive-grade temperature range (−40°C to +125°C), guaranteed 1 million erase/write cycles, 200-year data retention, and compatibility with standard I²C bus timing - especially under high-noise conditions where slope control and input filtering are critical.

Technical Context

The 24C00T-E/OT implements a slave-only I²C interface with fixed 4-bit device code '1010' and three don't-care address bits, enabling up to eight devices on a shared bus. It uses an internal address pointer that auto-increments during sequential reads and supports byte write, current address read, random read, and sequential read modes.

Its EEPROM array employs charge-pump-based high-voltage generation for erase/write operations, with built-in V_CC threshold detection (3.8 V nominal) disabling programming if supply drops below specification. Acknowledge polling is supported to detect write completion without fixed delay timing.

Key Specifications

Pinout & Package

Package: 5-lead SOT-23 (Microchip drawing C04-028D / C04-091D [OT]), footprint-optimized for high-density PCB layouts with minimal board area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24C00T-E/OT, the 24C01C-I/OT offers four times more memory but lacks automotive temperature qualification, while the AT24C01D-SSHM-T supports lower V_CC operation but requires layout changes due to SOIC-8 packaging - making 24C00T-E/OT optimal for space- and temperature-critical automotive subassemblies.

Availability

24C00T-E/OT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC configuration storage, and medical device UDI registration requiring stable component supply across extended product lifecycles.

Supply support for 24C00T-E/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, serving automotive, industrial, and consumer markets with vertically integrated design and manufacturing.

The 24C00T-E/OT belongs to Microchip's legacy 24XX00 family of ultra-small serial EEPROMs, engineered specifically for cost-sensitive, space-constrained applications needing reliable nonvolatile storage of minimal configuration data.

FAQ

What is the maximum I²C clock frequency supported by the 24C00T-E/OT?

The 24C00T-E/OT supports I²C clock frequencies up to 400 kHz when operated within its specified 4.5–5.5 V supply range and −40°C to +125°C temperature envelope. At this speed, timing parameters such as T_LOW (≥1300 ns) and T_HIGH (≥600 ns) must be strictly observed. The device also maintains full compatibility with standard 100 kHz I²C buses for backward integration.

Does the 24C00T-E/OT require external pull-up resistors on SDA and SCL lines?

Yes, the 24C00T-E/OT requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. For 400 kHz operation, a 2 kΩ pull-up to V_CC is recommended; for 100 kHz, 10 kΩ is typical. The 24C00T-E/OT itself does not integrate pull-ups, ensuring bus flexibility and compatibility with mixed-voltage systems.

Can the 24C00T-E/OT be used in place of the 24AA00 or 24LC00 in an existing design?

No - the 24C00T-E/OT is not a drop-in replacement for 24AA00 or 24LC00 due to its narrower 4.5–5.5 V operating range (vs. 1.8–5.5 V for 24AA00 and 2.5–5.5 V for 24LC00) and automotive temperature qualification. Substituting it may cause functional failure at lower voltages or outside the −40°C to +125°C range. Always verify V_CC margin and thermal environment before interchange.

How is write completion detected for the 24C00T-E/OT?

Write completion is detected using acknowledge polling: after issuing a Stop condition to initiate an internal write cycle, the host sends repeated Start + control byte (R/W = 0) sequences until the 24C00T-E/OT responds with an ACK. This method avoids fixed delays and adapts to process variation - the 24C00T-E/OT will not ACK while busy, and typical write time is 3 ms.

Is factory programming available for the 24C00T-E/OT, and what data can be pre-loaded?

Yes, factory programming is available for the 24C00T-E/OT through Microchip's wafer-level or final-test services. Pre-loadable data includes unique serial numbers, calibration coefficients, manufacturing date codes, and hardware revision IDs - all written once and permanently retained for 200 years. Contact Aetrix Electronics for quoting on custom programming options.