Microchip Technology 24LC02BT-E/OT

Overview

24LC02BT-E/OT from Microchip Technology Inc. is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protection, 8-byte page 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 and extended temperature ranges (–40°C to +125°C). It is used in embedded systems for storing calibration data, configuration settings, and device identifiers.

For engineers reviewing the 24LC02BT-E/OT datasheet, 24LC02BT-E/OT pinout, 24LC02BT-E/OT application, or 24LC02BT-E/OT equivalent, key selection considerations include its 2.5V minimum VCC, 400 kHz I²C speed at full voltage, WP-enabled hardware write-protect, 5 ms max page write time, and compatibility with standard two-wire bus timing requirements including Schmitt-trigger inputs and slope-controlled outputs.

Technical Context

The 24LC02BT-E/OT implements a two-wire serial interface compliant with I²C protocol standards, using open-drain SDA and input-only SCL pins with internal Schmitt triggers and noise filtering. Its address decoding ignores A0–A2 pins (no internal connection), accepting only the fixed 4-bit control code '1010' followed by don't-care bits and R/W bit.

Internally, it features a self-timed erase/write cycle controlled by an on-chip HV generator, 8-byte page latches for burst writes, and an address pointer that auto-increments during sequential reads. Write protection is implemented via direct logic-level control of the WP pin-tied to VCC to inhibit all writes while permitting unrestricted reads.

Key Specifications

Pinout & Package

24LC02BT-E/OT is supplied in the 5-lead SC-70 (LT) package: ultra-compact surface-mount outline measuring 2.00 mm × 1.25 mm × 0.80 mm (L × W × H), with gull-wing leads and pin 1 marked by notch or bevel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02BT-E/OT, the 24AA02T-I/OT trades extended temperature capability for lower-voltage operation, while the 24FC02T-E/OT upgrades speed at identical package and thermal rating-neither is pin-compatible drop-in replacements due to differing VCC and timing requirements.

Availability

24LC02BT-E/OT is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, medical device configuration, and smart energy meter firmware patch storage requiring stable component supply across extended temperature and long-life deployments.

Supply support for 24LC02BT-E/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 leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The 24LC02B family is designed for cost-sensitive, space-constrained embedded systems requiring robust, low-power nonvolatile storage with simple two-wire interface and hardware security via write-protection.

FAQ

What is the minimum operating voltage for the 24LC02BT-E/OT?

The 24LC02BT-E/OT requires a minimum VCC of 2.5V and operates up to 5.5V. Unlike the 24AA02 or 24FC02 variants, it is not specified for operation below 2.5V - attempting to power it below this threshold may result in undefined behavior or failure to respond on the I²C bus.

Does the 24LC02BT-E/OT support standard I²C addressing with A0–A2 pins?

No. The 24LC02BT-E/OT does not use A0–A2 pins; they are unconnected internally and may be left floating or tied to VSS/VCC without effect. The device responds only to the fixed 7-bit address 0x50 (1010000b) for write and 0x51 for read, as defined by its 4-bit control code '1010' and three don't-care bits.

How does hardware write-protection work on the 24LC02BT-E/OT?

When the WP pin of the 24LC02BT-E/OT is driven to VCC, all write operations (byte and page) to the entire 256-byte memory array are inhibited; reads remain fully functional. When WP is at VSS (or grounded), normal read/write access is enabled. No software command or register setting overrides this hardware lock.

What is the maximum page write size supported by the 24LC02BT-E/OT?

The 24LC02BT-E/OT supports an 8-byte page write buffer. Writes crossing physical page boundaries (every 8 bytes: 0x00–0x07, 0x08–0x0F, etc.) wrap around within the same page - so writing 9 bytes starting at 0x00 stores bytes 0–7 at 0x00–0x07 and byte 8 at 0x00, overwriting the first location. Proper firmware must enforce page-aligned multi-byte writes.

Is the 24LC02BT-E/OT qualified for automotive applications?

Yes. The 24LC02BT-E/OT carries AEC-Q100 qualification for Grade 1 (–40°C to +125°C) and is explicitly listed in Microchip's automotive-grade product documentation. Its extended temperature rating, 4 kV ESD rating, and robust I²C interface make it suitable for body electronics, infotainment, and powertrain auxiliary functions.