Microchip Technology 24LC01BT-I/LT

Overview

24LC01BT-I/LT 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 down to 2.5V. It supports up to 400 kHz clock frequency, delivers ≤1 mA active current and ≤1 µA standby current (I-temp), and is rated for industrial temperature range (–40°C to +85°C). It is commonly used in embedded system configuration storage, sensor calibration data retention, and power-management parameter backup.

For engineers reviewing the 24LC01BT-I/LT datasheet, 24LC01BT-I/LT pinout, 24LC01BT-I/LT application, or 24LC01BT-I/LT equivalent, key selection criteria include VCC min (2.5V), I²C speed grade (400 kHz max), SC-70-5 package footprint, WP-controlled full-array write protection, and endurance (>1 million cycles).

Technical Context

The 24LC01BT-I/LT implements a 2-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 operations - all managed by dedicated memory control logic.

It operates exclusively as a slave device on the I²C bus, responding to fixed 7-bit client address 1010xxx (R/W bit determines mode), with A0–A2 pins unconnected and electrically floating. Write cycles are self-timed (max 5 ms), and acknowledge polling is supported to detect completion without fixed delay timing.

Key Specifications

Pinout & Package

24LC01BT-I/LT is supplied in a 5-lead SC-70 (LT) package - a compact, surface-mount plastic outline measuring 2.00 mm × 1.25 mm × 0.95 mm (L × W × H), with gull-wing leads and pin 1 marked by a notch or bevel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01BT-I/LT, 24AA01T-I/LT extends low-voltage operation but shares identical timing and endurance; 24LC01B-I/P retains full electrical compatibility while changing to through-hole assembly - both require no firmware or schematic changes beyond physical layout adaptation.

Availability

24LC01BT-I/LT is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration backup, and automotive body control module applications requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for 24LC01BT-I/LT 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, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC01B family was designed specifically for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage of configuration and calibration data in space-constrained footprints.

FAQ

What is the minimum operating voltage for the 24LC01BT-I/LT?

The 24LC01BT-I/LT requires a minimum VCC of 2.5V, as specified in its Electrical Characteristics table. Unlike the 24AA01 variant (1.7V min), it is not rated for operation below 2.5V - attempting to power it at 1.8V will result in undefined behavior or failure to respond on the I²C bus. Always verify supply rail stability within 2.5V–5.5V during system power sequencing.

Does the 24LC01BT-I/LT support 1 MHz I²C communication?

No, the 24LC01BT-I/LT supports up to 400 kHz I²C clock frequency. The 1 MHz capability is exclusive to the 24FC01 variant. Attempting to run SCL above 400 kHz with the 24LC01BT-I/LT may cause timing violations, missed ACKs, or incomplete writes - confirmed by AC Characteristics Table 1-2, which specifies 400 kHz maximum for VCC ≥2.5V.

How does the WP pin function on the 24LC01BT-I/LT?

On the 24LC01BT-I/LT, the WP pin is a logic-level input: when tied to VCC, it disables all write operations (byte and page) to the full 128-byte memory array (addresses 00h–7Fh), while read operations remain fully functional. When tied to VSS (or left floating, though not recommended), write protection is disabled and normal read/write access is enabled. This is a hardware-enforced feature independent of I²C commands.

What package type is used for the 24LC01BT-I/LT?

The 24LC01BT-I/LT uses the 5-lead SC-70 package, designated by the "LT" suffix per Microchip's packaging nomenclature. Its dimensions are 2.00 mm × 1.25 mm × 0.95 mm, with gull-wing leads and pin 1 identified by a beveled corner or notch. This ultra-compact outline is optimized for high-density PCB layouts in portable and automotive electronics.

Can the 24LC01BT-I/LT be used in automotive applications?

Yes - the 24LC01BT-I/LT is AEC-Q100 qualified and rated for the industrial temperature range (–40°C to +85°C), making it suitable for under-dash and cabin-mounted automotive applications such as body control modules, HVAC controllers, and infotainment system configuration storage. It is not qualified for under-hood (Grade 1, –40°C to +125°C) use; for that, the 24LC01B-E/ variants are required.