Microchip Technology 24C00T-E/ST

Overview

24C00T-E/ST from Microchip Technology Inc. is a 128-bit (16 × 8) I²C-compatible serial EEPROM designed for nonvolatile storage of calibration data, device IDs, and manufacturing parameters in space-constrained industrial and automotive systems. It operates at 4.5–5.5 V, supports 100 kHz/400 kHz clock rates, features Schmitt-trigger inputs, and delivers typical standby current of 100 nA and read current of 500 µA.

For engineers reviewing the 24C00T-E/ST datasheet, 24C00T-E/ST pinout, 24C00T-E/ST application, or 24C00T-E/ST equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases, and validated alternative parts for design-in decisions under automotive temperature (-40°C to +125°C) and RoHS-compliant requirements.

Technical Context

The 24C00T-E/ST implements a slave-only I²C interface with fixed 4-bit device code '1010' and three don't-care address bits, enabling single-bus addressing without external hardware configuration. Its internal address pointer auto-increments during sequential reads and retains position after byte writes.

It uses on-chip charge-pump voltage generation to support EEPROM erase/write cycles at V_CC ≥ 4.5 V, with built-in V_CC threshold detection disabling programming below 3.8 V. Write operations are self-timed (typ. 3 ms), and ACK polling is supported to synchronize host firmware without fixed delays.

Key Specifications

Pinout & Package

24C00T-E/ST is supplied in a 5-lead SOT-23 package (Microchip drawing C04-028D/OT), with pin 1 marked by a dot or beveled edge. The exposed pad is not electrically connected and may be left floating or tied to V_SS for thermal relief.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24C00T-E/ST, the 24AA00T-I/OT trades automotive qualification for wider voltage flexibility, while the AT24C01C-SSHM-T provides scalable memory headroom within the same mechanical and electrical interface - both require validation of timing margins and ACK polling behavior in target host firmware.

Availability

24C00T-E/ST is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and smart energy metering requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for 24C00T-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, serving automotive, industrial, and consumer markets with vertically integrated silicon and development tools.

The 24XX00 family was engineered specifically for ultra-low-power, space-constrained nonvolatile storage in cost-sensitive applications where reliability, small footprint, and I²C simplicity are critical - especially in automotive and industrial edge nodes.

FAQ

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

The 24C00T-E/ST supports up to 400 kHz I²C clock frequency 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 met by the master controller. The device also fully complies with standard-mode 100 kHz operation for compatibility with legacy hosts.

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

Yes, the 24C00T-E/ST 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. These values ensure proper rise times (<300 ns) and noise margin while accommodating bus capacitance up to 400 pF.

How does the 24C00T-E/ST handle write operations during power instability?

The 24C00T-E/ST incorporates an internal V_CC threshold detector that disables the erase/write logic if V_CC falls below 3.8 V. This prevents partial or corrupted writes during brown-out conditions. Combined with its 100 nA standby current, this feature ensures data integrity even during intermittent power events common in automotive and industrial environments.

Can the 24C00T-E/ST be used in place of the 24LC00T-I/ST?

No - the 24C00T-E/ST and 24LC00T-I/ST differ in supply voltage range (4.5–5.5 V vs. 2.5–5.5 V), temperature grade (Automotive E vs. Industrial I), and internal programming voltage thresholds. Substituting them without verifying host system V_CC stability and ambient temperature profile risks functional failure or reduced endurance.

Is the NC pin on the 24C00T-E/ST's SOT-23 package electrically connected?

No, the NC pin (Pin 4) on the 24C00T-E/ST in SOT-23 package is not connected to any internal circuitry. It must remain unconnected - neither routed nor soldered - to avoid unintended parasitic coupling or mechanical stress on the die bond wire. Microchip's package drawings confirm this pin is designated "Not Connected" in all SOT-23 variants of the 24C00T-E/ST.