Microchip Technology 24LC02BHT-I/LT

Overview

24LC02BHT-I/LT from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protect for the upper half-array (80h–FFh), 1.7–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It supports 100 kHz/400 kHz clock rates, features Schmitt-trigger inputs and slope-controlled outputs, and is packaged in an 8-lead TDFN.

For engineers reviewing the 24LC02BHT-I/LT datasheet, 24LC02BHT-I/LT pinout, 24LC02BHT-I/LT application, or 24LC02BHT-I/LT equivalent, key selection criteria include half-array write-protection behavior, 5 ms max page write time, 1 µA standby current, I²C bus timing compliance at 2.5 V minimum, and TDFN package thermal and layout constraints.

Technical Context

The 24LC02BHT-I/LT implements a two-wire I²C interface with fixed 7-bit client address (1010xxx) and R/W bit control, supporting byte and 8-byte page writes with self-timed erase/write cycles. Its internal Address Pointer auto-increments during sequential reads and random-access operations.

Write protection is implemented via the WP pin: tied to VCC, it disables writes to addresses 80h–FFh while permitting full read access; tied to VSS, full read/write operation is enabled. All A0–A2 pins are unconnected and may be left floating or tied to VSS/VCC without effect.

Key Specifications

Pinout & Package

8-lead TDFN (2 mm × 3 mm, 0.5 mm pitch) with exposed pad (optional VSS connection). Pin 1 = A0 (NC), Pin 2 = A1 (NC), Pin 3 = A2 (NC), Pin 4 = VSS, Pin 5 = SDA, Pin 6 = SCL, Pin 7 = WP, Pin 8 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02BHT-I/LT, the 24AA02H-I/LT enables sub-2.5 V operation but omits AEC-Q100 validation, while AT24C02D-SSHM-T trades half-array protection for broader voltage range and SOIC compatibility - making 24LC02BHT-I/LT optimal for space-constrained, automotive-grade, and selectively protected applications.

Availability

24LC02BHT-I/LT is available at Aetrix Electronics and suitable for smart sensor calibration storage, IoT device identity management, and industrial PLC configuration backup requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability.

Supply support for 24LC02BHT-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, FPGA, and memory solutions, serving industrial, automotive, and communications markets with high-reliability silicon and development tools.

The 24XX02H family delivers cost-effective, low-power serial EEPROMs optimized for embedded systems needing robust nonvolatile storage with hardware-based data protection and I²C interoperability.

FAQ

What is the function of the A0, A1, and A2 pins on the 24LC02BHT-I/LT?

The A0, A1, and A2 pins on the 24LC02BHT-I/LT are not internally connected and serve no functional purpose. They may be left floating or tied to VSS or VCC without affecting device operation, addressing, or I²C communication. This simplifies PCB layout and eliminates address configuration overhead - unlike higher-density EEPROMs, the 24LC02BHT-I/LT uses a fixed 7-bit client address (1010xxx).

How does the WP pin affect memory access in the 24LC02BHT-I/LT?

When the WP pin on the 24LC02BHT-I/LT is tied to VCC, write operations to memory addresses 80h–FFh (upper 128 bytes) are inhibited while reads remain fully functional; tying WP to VSS enables full read/write access across the entire 256-byte array. This hardware-level protection prevents accidental overwrites of critical firmware or security data without requiring software locks or MCU intervention.

What is the maximum write cycle time for the 24LC02BHT-I/LT, and how does it impact system design?

The maximum write cycle time for the 24LC02BHT-I/LT is 5 ms for both byte and page writes. During this time, the device does not acknowledge I²C commands, enabling ACK polling to detect completion. This deterministic timing allows predictable interrupt latency and bus arbitration - essential for real-time systems where EEPROM writes must not block time-critical tasks beyond a known 5 ms window.

Is the 24LC02BHT-I/LT qualified for automotive applications?

Yes, the 24LC02BHT-I/LT is AEC-Q100 qualified for automotive applications. It meets Grade 2 temperature requirements (–40°C to +105°C junction, rated for –40°C to +85°C ambient operation), supports 2.5–5.5 V supply, and delivers 1 million endurance cycles with >200 years data retention - making it suitable for body control modules, infotainment configuration storage, and ADAS subsystems requiring certified reliability.

Can the 24LC02BHT-I/LT operate at 1.8 V?

No, the 24LC02BHT-I/LT requires a minimum VCC of 2.5 V and is not rated for 1.8 V operation. For 1.7–5.5 V compatibility including 1.8 V systems, Microchip's 24AA02H-I/LT is the functionally equivalent alternative - both share identical pinout, memory organization, and feature set, but differ in voltage specification and automotive qualification status.