Microchip Technology 24LC02BHT-E/OT

Overview

24LC02BHT-E/OT 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), 400 kHz max clock frequency at V_CC ≥ 2.5 V, and extended temperature operation from –40°C to +125°C. It supports page writes up to 8 bytes, features Schmitt-trigger inputs and slope-controlled outputs for noise immunity, and is used in industrial sensor calibration storage and embedded system configuration retention.

For engineers reviewing the 24LC02BHT-E/OT datasheet, 24LC02BHT-E/OT pinout, 24LC02BHT-E/OT application, or 24LC02BHT-E/OT equivalent, key selection criteria include its 2.5–5.5 V supply range, E-temp grade qualification, half-array write-protection logic, and compatibility with standard I²C bus timing including 100 kHz fallback below 2.5 V.

Technical Context

The 24LC02BHT-E/OT implements a two-wire I²C interface with fixed 7-bit client address (1010xxx) and R/W bit control, supporting byte and page write modes with self-timed internal erase/write cycles. Its Address Pointer auto-increments during sequential reads and random-access operations, enabling full memory traversal without external address management.

Write protection is implemented via the WP pin: tied to V_CC, it disables writes to addresses 0x80–0xFF while allowing full read access; tied to V_SS, all 256 bytes are writable. The device uses open-drain SDA/SCL with internal Schmitt triggers and input filtering (50 ns spike suppression), eliminating ground bounce and ensuring robust operation on noisy PCBs.

Key Specifications

Pinout & Package

24LC02BHT-E/OT is supplied in the 5-lead SOT-23 package (JEDEC MO-178AA), with pin 1 = SCL, pin 2 = V_SS, pin 3 = SDA, pin 4 = V_CC, pin 5 = WP. A0–A2 pins are unconnected 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 AT24C02D-SSHM-T and BR24G02FJ-3GE2, the 24LC02BHT-E/OT uniquely combines extended temperature rating, dedicated hardware write-protect, and Microchip's AEC-Q100 qualification - making it the only option for safety-critical automotive or high-reliability industrial use cases demanding physical write-locking and +125°C operation.

Availability

24LC02BHT-E/OT is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU configuration, and medical device parameter storage requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24LC02BHT-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC02BH family was designed specifically for reliable, low-power nonvolatile storage in space-constrained embedded systems where hardware-based write protection and extended temperature operation are essential.

FAQ

What is the maximum I²C clock frequency supported by the 24LC02BHT-E/OT?

The 24LC02BHT-E/OT supports up to 400 kHz when V_CC is 2.5 V or higher. At V_CC below 2.5 V, the maximum clock frequency drops to 100 kHz. This dual-speed capability allows flexible integration across both 3.3 V and 5 V systems while maintaining timing compliance per I²C specification. The 24LC02BHT-E/OT datasheet specifies exact setup/hold times for both modes.

How does the WP pin function on the 24LC02BHT-E/OT?

When the WP pin of the 24LC02BHT-E/OT is tied to V_CC, writes to memory addresses 0x80–0xFF are disabled while reads remain fully functional; tying WP to V_SS enables full read/write access to all 256 bytes. This hardware-level protection is active independently of software state and persists through power cycles. The 24LC02BHT-E/OT does not require any command sequence to activate or deactivate this feature.

Is the 24LC02BHT-E/OT compatible with standard I²C protocol?

Yes, the 24LC02BHT-E/OT implements a fully compliant two-wire I²C interface with fixed 7-bit address prefix '1010' and R/W bit control. It supports standard Start/Stop conditions, ACK polling during write cycles, and all three read modes (current address, random, sequential). The 24LC02BHT-E/OT meets I²C bus electrical requirements including rise/fall time and noise immunity specifications.

What package type is used for the 24LC02BHT-E/OT?

The 24LC02BHT-E/OT is packaged in a 5-lead SOT-23 (JEDEC MO-178AA) with pin 1 = SCL, pin 2 = V_SS, pin 3 = SDA, pin 4 = V_CC, pin 5 = WP. A0–A2 pins are internally unconnected and may be left floating or tied to V_SS/V_CC without effect. This compact footprint supports high-density PCB layouts in space-constrained applications.

Does the 24LC02BHT-E/OT require external pull-up resistors on SDA and SCL lines?

Yes, the 24LC02BHT-E/OT has open-drain SDA and SCL outputs and requires external pull-up resistors. For 400 kHz operation, a 2 kΩ resistor to V_CC is recommended; for 100 kHz, a 10 kΩ resistor is typical. Pull-up strength directly affects rise time and bus noise margin - undersized resistors cause slow edges and communication errors, especially with multiple devices on the same bus. The 24LC02BHT-E/OT datasheet provides detailed guidance on bus capacitance limits.