Microchip Technology 24LC02BT-I/LT

Overview

24LC02BT-I/LT from Microchip Technology is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protection, 8-byte page buffer, and operation down to 2.5V. It supports 400 kHz clock frequency, delivers ≤1 mA read current and ≤1 µA standby current (I-temp), and is qualified for industrial temperature range (–40°C to +85°C) in SC-70 package - used for firmware storage, calibration data retention, and configuration backup in space-constrained embedded systems.

For engineers reviewing the 24LC02BT-I/LT datasheet, 24LC02BT-I/LT pinout, 24LC02BT-I/LT application, or 24LC02BT-I/LT equivalent, key selection considerations include its 5-pin SC-70 footprint, VCC=2.5–5.5V supply constraint, fixed I²C address (1010xxx0/1), WP-controlled full-array write protection, and 5 ms max page write time - critical for low-power, noise-immune, and layout-sensitive designs.

Technical Context

The 24LC02BT-I/LT implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress ground bounce and bus noise. Its internal architecture includes an 8-byte page latch, address pointer auto-increment logic, and self-timed erase/write cycle controlled by an on-chip high-voltage generator.

It operates exclusively as a slave device, responding only to valid control bytes (1010xxxR/W) and acknowledging after each byte; during internal write cycles, it inhibits ACK to enable polling-based timing synchronization - ensuring deterministic bus arbitration in multi-device systems.

Key Specifications

Pinout & Package

24LC02BT-I/LT uses the 5-lead SC-70 (Microchip package code LT) with 1.25 mm pitch, 2.00 mm × 1.25 mm body, and wettable flank capability for automated optical inspection. Pin 1 is SCL; Pin 2 is VSS; Pin 3 is SDA; Pin 4 is WP; Pin 5 is VCC. A0/A1/A2 are not connected internally and may be left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02BT-I/LT, 24AA02T-I/LT extends low-voltage operation but shares identical pinout and timing; AT24C02D-SSHM-T provides automotive qualification and SOIC-8 compatibility but demands layout change - making 24LC02BT-I/LT optimal for cost-sensitive, space-constrained industrial designs requiring guaranteed 2.5V+ operation.

Availability

24LC02BT-I/LT is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics devices, and consumer electronics requiring stable component supply, long-term data retention, and compact surface-mount packaging.

Supply support for 24LC02BT-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC02B family was designed specifically for reliable, low-power, I²C-based nonvolatile storage in resource-constrained embedded systems - emphasizing write endurance, noise immunity, and industrial temperature resilience.

FAQ

What is the minimum operating voltage for the 24LC02BT-I/LT?

The 24LC02BT-I/LT requires a minimum VCC of 2.5V, as specified in its Electrical Characteristics table. Unlike the 24AA02 variant, it is not rated for operation below 2.5V - attempting sub-2.5V supply will result in undefined behavior or failure to acknowledge I²C commands. Always maintain VCC ≥2.5V across the full industrial temperature range.

Does the 24LC02BT-I/LT support standard I²C addressing with multiple devices on one bus?

Yes, the 24LC02BT-I/LT uses a fixed 4-bit control code (1010) followed by three "don't care" bits, resulting in a base address of 0xA0 (write) / 0xA1 (read). Since A0–A2 pins are unconnected and unused, all 24LC02BT-I/LT devices share the same I²C address - requiring external multiplexing or dedicated bus segments for multi-device configurations.

How does the Write-Protect (WP) pin function on the 24LC02BT-I/LT?

On the 24LC02BT-I/LT, the WP pin is a hardwired enable/disable control: tying WP to VCC disables all write operations (including byte and page writes) while preserving read access; tying WP to VSS enables full read/write functionality. No internal register or software command overrides this hardware lock - making it ideal for protecting calibration data during field service.

What is the maximum page write size supported by the 24LC02BT-I/LT?

The 24LC02BT-I/LT supports an 8-byte page write buffer. Writes crossing physical page boundaries (e.g., starting at address 0x07 and writing 8 bytes) wrap around to the start of the same page instead of advancing to the next - so software must ensure all bytes in a single page write fall within addresses 0x00–0x07, 0x08–0x0F, etc. Exceeding 8 bytes triggers automatic rollover and data loss.

Is the 24LC02BT-I/LT RoHS compliant and AEC-Q100 qualified?

The 24LC02BT-I/LT is RoHS compliant per Microchip's DS20001709N documentation. However, only the 24LC02B automotive-grade variants (e.g., 24LC02BT-E/MNY) are AEC-Q100 qualified; the "I" temperature grade (industrial) in the 24LC02BT-I/LT part number indicates industrial qualification only - not automotive stress testing or failure rate certification.