Microchip Technology 24LC01BT-E/LT

Overview

24LC01BT-E/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 buffer, and operation down to 2.5V. It supports 400 kHz clock frequency, features Schmitt-trigger inputs and slope-controlled outputs, and is qualified for extended temperature range (–40°C to +125°C) in SC-70 package. Used for configuration storage in space-constrained industrial sensors.

For engineers reviewing the 24LC01BT-E/LT datasheet, 24LC01BT-E/LT pinout, 24LC01BT-E/LT application, or 24LC01BT-E/LT equivalent, key selection criteria include VCC min (2.5V), E-temp rating, SC-70 footprint compatibility, I²C timing compliance at 400 kHz, and WP-enabled hardware lock for critical firmware parameters.

Technical Context

The 24LC01BT-E/LT implements a 2-wire I²C interface with fixed 7-bit client address (1010xxx) and R/W bit control. Its internal architecture includes an 8-byte page latch, EEPROM array with >1 million endurance cycles, and HV generator for erase/write operations - all managed by on-chip memory control logic without external high-voltage supply.

It uses open-drain SDA/SCL with integrated Schmitt triggers and input filtering (50 ns spike suppression), enabling robust operation on noisy buses. Write protection is implemented via dedicated WP pin tied to VCC to inhibit all writes across the full 00h–7Fh address space while permitting unrestricted reads.

Key Specifications

Pinout & Package

5-Lead SC-70 (LT) package: compact 2.0 mm × 1.25 mm footprint with 0.65 mm pitch, optimized for high-density PCB layouts. Exposed pad optional; no internal connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01BT-E/LT, the 24AA01T-I/LT trades extended temperature support for lower-voltage operation, while the 24FC01T-E/LT adds 1 MHz capability at identical package and protection features - both retain the same 1 Kbit density and hardware WP pin behavior.

Availability

24LC01BT-E/LT is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, medical infusion pump settings, and smart energy meter firmware patch storage requiring stable component supply across extended temperature ranges.

Supply support for 24LC01BT-E/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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC01B family targets cost-sensitive, space-constrained embedded systems needing reliable nonvolatile storage with minimal external components and guaranteed write-protection - especially where extended temperature operation is mandatory.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LC01BT-E/LT?

The 24LC01BT-E/LT requires a minimum VCC of 2.5V for guaranteed operation across its full extended temperature range (–40°C to +125°C). Below 2.5V, timing margins degrade and write cycles may fail; this distinguishes it from the 24AA01 (1.7V min) and confirms its role in higher-voltage industrial designs. The 24LC01BT-E/LT datasheet specifies DC characteristics only for VCC ≥2.5V in E-temp conditions.

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

No, the 24LC01BT-E/LT is rated for a maximum clock frequency of 400 kHz under all specified conditions. The 1 MHz capability is exclusive to the 24FC01 variant. Attempting 1 MHz operation on the 24LC01BT-E/LT violates AC specifications - THIGH and TLOW timing limits would be violated, causing communication failures or data corruption.

How does the WP pin function on the 24LC01BT-E/LT, and what happens when it is left floating?

On the 24LC01BT-E/LT, the WP pin must be actively driven to either VSS (enable writes) or VCC (disable all writes). Leaving WP floating is undefined and risks partial or intermittent write protection due to noise coupling - Microchip explicitly states WP "must be connected" and does not guarantee behavior in floating state. For fail-safe operation, tie WP directly to VCC if write protection is required.

What is the physical page size of the 24LC01BT-E/LT, and why does it matter for page writes?

The 24LC01BT-E/LT has an 8-byte physical page size (addresses 00h–07h, 08h–0Fh, etc.). Page writes crossing a boundary (e.g., writing 8 bytes starting at 07h) wrap around to the start of the same page instead of advancing to the next - overwriting earlier bytes. This requires firmware to align page writes to modulo-8 addresses, making the 24LC01BT-E/LT's page buffer behavior deterministic but layout-sensitive.

Is the 24LC01BT-E/LT AEC-Q100 qualified, and which stress test grades apply?

Yes, the 24LC01BT-E/LT is AEC-Q100 qualified for Grade 1 (–40°C to +125°C), matching its extended temperature rating. Qualification includes accelerated environmental stress tests (HTOL, TC, UHST, etc.) per Rev G requirements. This certification is documented in Microchip's official AEC-Q100 reports for the 24LC01B family and applies specifically to E-temp variants including the 24LC01BT-E/LT.