Microchip Technology 24LC02BHT-E/ST

Overview

24LC02BHT-E/ST 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 operation over –40°C to +125°C (Extended temperature grade). It supports page writes of up to 8 bytes, features Schmitt-trigger inputs and slope-controlled outputs, and targets embedded system configuration storage in automotive and industrial controllers.

For engineers reviewing the 24LC02BHT-E/ST datasheet, 24LC02BHT-E/ST pinout, 24LC02BHT-E/ST application, or 24LC02BHT-E/ST equivalent, key selection criteria include its 2.5–5.5 V supply range, half-array write-protection via WP pin, 5 ms max page write time, 1 µA standby current, and compatibility with I²C bus timing at both 100 kHz and 400 kHz.

Technical Context

The 24LC02BHT-E/ST 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 automatic internal erase/write cycle timing. Its Address Pointer increments on each read or write, enabling sequential access across the full 256-byte array.

Write protection is implemented via the WP pin: tied to V_CC, it disables writes to addresses 0x80–0xFF while allowing reads; tied to V_SS, full memory access is enabled. A0–A2 pins are unconnected and may be left floating or tied to V_SS/V_CC without functional impact.

Key Specifications

Pinout & Package

24LC02BHT-E/ST is supplied in an 8-lead SOIC (SN) package per Microchip drawing C04-057-SN Rev F, with 1.27 mm pitch, 3.90 mm body width, and JEDEC-standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02D-SSHM-T and M95020-WMN6TP, the 24LC02BHT-E/ST uniquely combines AEC-Q100 qualification, hardware half-array write protection, and guaranteed 400 kHz I²C performance at 125°C - making it the sole option for safety-critical automotive and high-temperature industrial EEPROM applications.

Availability

24LC02BHT-E/ST is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24LC02BHT-E/ST 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 24LC02BHT-E/ST belongs to Microchip's 24XX02H family of I²C EEPROMs, designed specifically for reliable, low-power nonvolatile storage in automotive, industrial, and medical systems where data integrity and extended temperature operation are mandatory.

FAQ

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

The 24LC02BHT-E/ST supports up to 400 kHz I²C clock frequency when V_CC is 2.5 V or higher. At supply voltages below 2.5 V (down to 1.7 V), the maximum clock frequency is limited to 100 kHz. This dual-speed capability ensures compatibility with both legacy 100 kHz systems and modern high-throughput I²C implementations, and is explicitly defined in the DS20002105B datasheet AC characteristics table.

How does the write-protect (WP) pin function on the 24LC02BHT-E/ST?

On the 24LC02BHT-E/ST, the WP pin enables hardware-based half-array write protection. When WP is tied to V_CC, writes to memory addresses 0x80–0xFF are inhibited while reads remain fully functional. When WP is tied to V_SS, full read/write access to the entire 256-byte array is enabled. This behavior is confirmed in Section 2.4 and Figure 6-3 of the DS20002105B datasheet.

Is the 24LC02BHT-E/ST AEC-Q100 qualified?

Yes, the 24LC02BHT-E/ST is explicitly AEC-Q100 qualified for automotive applications, as stated in the "Features" section of the DS20002105B datasheet. Its Extended temperature grade (–40°C to +125°C) and qualification status make it suitable for under-hood and other demanding automotive subsystems where reliability and thermal robustness are critical.

What is the page write buffer size of the 24LC02BHT-E/ST?

The 24LC02BHT-E/ST features an 8-byte page write buffer, allowing up to eight consecutive bytes to be loaded into the internal buffer before initiating the self-timed write cycle. This reduces total programming time compared to individual byte writes and is documented in the "Features" list and Section 6.2 of the DS20002105B datasheet.

Are pins A0, A1, and A2 functional on the 24LC02BHT-E/ST?

No, pins A0, A1, and A2 are not internally connected on the 24LC02BHT-E/ST and serve no functional purpose. As confirmed in Section 2.1 and Table 2-1 of the DS20002105B datasheet, these pins may be left floating or tied to V_SS/V_CC without affecting device operation or addressing - the device uses a fixed I²C client address (1010xxx).