Microchip Technology 24LC01BT/OT

Overview

24LC01BT/OT from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 8-byte page write buffer, and operation from 2.5V to 5.5V. It supports 400 kHz clock frequency, delivers ≤1 mA active current and ≤1 µA standby current (I-temp), and is qualified for industrial temperature range (–40°C to +85°C). It is commonly used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.

For engineers reviewing the 24LC01BT/OT datasheet, 24LC01BT/OT pinout, 24LC01BT/OT application, or 24LC01BT/OT equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented functional differences, and supply-chain-ready availability details - all specific to the 24LC01BT/OT SOT-23-5 package variant.

Technical Context

The 24LC01BT/OT implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes an 8-byte page latch, address pointer, EEPROM array, and HV generator for write/erase cycles - enabling self-timed 5 ms max write operations without external timing control.

It uses a fixed 4-bit device identifier (1010) with three "don't care" address bits and R/W bit, resulting in a single client address (0xA0 for write, 0xA1 for read) regardless of A0–A2 pin states. The WP pin provides hardware-level write protection for the full 128-byte memory block when tied high.

Key Specifications

Pinout & Package

24LC01BT/OT is supplied in the 5-lead SOT-23 package (Microchip part code LT), with pin 1 = SCL, pin 2 = VSS, pin 3 = SDA, pin 4 = WP, pin 5 = VCC. Pins A0–A2 are not internally connected and omitted from this 5-pin variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA01T/OT and AT24C01D-SSHM-T, the 24LC01BT/OT provides optimized performance for industrial 3.3V/5V systems with strict VCC ≥2.5V, delivering lower risk of undervoltage-induced corruption and simpler firmware (no WCINT polling) while maintaining full pin and functional compatibility within its operating window.

Availability

24LC01BT/OT is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 24LC01BT/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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The 24LC01B series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-effective, low-power, I²C-based nonvolatile data storage in industrial, automotive, and consumer applications where reliability and qualification matter more than ultra-high speed.

FAQ

What is the exact memory organization of the 24LC01BT/OT?

The 24LC01BT/OT contains 128 words of 8-bit memory (1 Kbit total), arranged linearly from address 0x00 to 0x7F. It has no internal block or sector structure beyond the 8-byte page boundary used for page write operations. Each byte is individually addressable via the I²C interface, and the internal address pointer auto-increments during sequential reads.

Can the A0, A1, and A2 pins on the 24LC01BT/OT be used to select different I²C addresses?

No - the 24LC01BT/OT is a 5-pin SOT-23 variant that omits A0, A1, and A2 pins entirely. Its I²C address is fixed at 0xA0 (write) / 0xA1 (read) regardless of external connections. This differs from 8-pin variants (e.g., SOIC, TSSOP) where those pins are present but internally unconnected and unused.

What happens if a page write crosses a physical page boundary on the 24LC01BT/OT?

If a page write command attempts to write across a physical page boundary (e.g., starting at 0x07 and writing 8 bytes), the address pointer wraps around to the start of the same page (0x00), overwriting previously loaded data in that page. The 24LC01BT/OT does not auto-advance to the next page - software must enforce alignment to 8-byte boundaries to avoid data corruption.

Is the 24LC01BT/OT AEC-Q100 qualified, and what grade does it meet?

Yes, the 24LC01BT/OT is AEC-Q100 qualified for Grade 2 (–40°C to +105°C ambient), exceeding its rated industrial temperature range (–40°C to +85°C). This qualification covers stress testing for reliability in automotive environments, including thermal cycling, humidity bias, and ESD robustness - making it suitable for body electronics and infotainment subsystems.

How does the WP pin function on the 24LC01BT/OT, and what voltage levels are valid?

On the 24LC01BT/OT, the WP pin is a digital input: tying it to VSS (0V) enables full read/write access; tying it to VCC (2.5–5.5V) disables all write operations (including byte and page writes) while allowing unlimited reads. Voltages between 0.3×VCC and 0.7×VCC are undefined and must be avoided to prevent metastability or partial protection.