Microchip Technology 24LC02BHT-I/SN

Overview

24LC02BHT-I/SN 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 operation, and industrial temperature range (–40°C to +85°C). It supports 100 kHz/400 kHz clock rates, features Schmitt-trigger inputs, slope-controlled outputs, and an 8-byte page write buffer - deployed in embedded system configuration storage, sensor calibration data retention, and secure device identity storage.

For engineers reviewing the 24LC02BHT-I/SN datasheet, 24LC02BHT-I/SN pinout, 24LC02BHT-I/SN application, or 24LC02BHT-I/SN equivalent, key selection criteria include VCC compatibility (2.5–5.5 V min), half-array write-protection behavior, I²C timing compliance at 400 kHz, and SOIC-8 (SN) package footprint validation for PCB layout.

Technical Context

The 24LC02BHT-I/SN 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 memory array uses CMOS EEPROM technology with on-chip address pointer logic enabling current-address, random, and sequential read operations.

Hardware write protection is implemented via the WP pin: tied to VSS enables full-array writes; tied to VCC locks addresses 80h–FFh while permitting reads across the entire 256-byte space. All I/O pins (SDA, SCL, WP) feature Schmitt-trigger inputs and noise filtering (50 ns spike suppression), and SDA is open-drain requiring external pull-up.

Key Specifications

Pinout & Package

24LC02BHT-I/SN is supplied in an 8-lead narrow-body SOIC package (SN), measuring 3.90 mm × 4.90 mm × 1.25 mm, with 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02C-SSHM-T and ST24C02-WDT6-TR, the 24LC02BHT-I/SN uniquely delivers deterministic hardware-enforced half-array write protection - critical for safety-critical or regulatory-compliant systems where software-only locks are insufficient.

Availability

24LC02BHT-I/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, medical calibration storage, and automotive body control modules requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.

Supply support for 24LC02BHT-I/SN 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 and manufacturing infrastructure.

The 24LC02BHT-I/SN belongs to Microchip's 24XX02H family of I²C EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in space-constrained embedded systems across industrial, medical, and automotive markets.

FAQ

What is the minimum VCC voltage required for reliable operation of the 24LC02BHT-I/SN?

The 24LC02BHT-I/SN requires a minimum VCC of 2.5 V for guaranteed operation across its industrial temperature range (–40°C to +85°C). Below 2.5 V, the device is not specified - unlike the 24AA02H variant, which supports down to 1.7 V. This 2.5 V floor ensures stable EEPROM write margins and I²C timing compliance at 400 kHz. Always verify VCC stability during write cycles to prevent data corruption in the 24LC02BHT-I/SN.

How does the WP pin function on the 24LC02BHT-I/SN, and what happens when it is left unconnected?

On the 24LC02BHT-I/SN, the WP pin is active-high: tying it to VCC write-protects memory addresses 80h–FFh (128 bytes), while tying it to VSS enables full-array read/write. The datasheet explicitly states WP must be connected to either VSS or VCC - leaving it floating is undefined and risks partial or intermittent protection failure. For default writable operation, connect WP to VSS; for factory-lock mode, tie to VCC. This behavior is hardwired and independent of I²C commands in the 24LC02BHT-I/SN.

Can the 24LC02BHT-I/SN perform page writes across address boundaries, and what occurs if it does?

No - the 24LC02BHT-I/SN restricts page writes to within a single 8-byte physical page (e.g., 00h–07h, 08h–0Fh). If a page write command crosses a boundary (e.g., starting at 06h with 8 bytes), the address pointer wraps around to the start of the same page (00h), overwriting prior data instead of advancing to the next page. This wraparound behavior is inherent to the 24LC02BHT-I/SN's on-chip page buffer architecture and must be managed in firmware to avoid unintended data loss.

What is the maximum I²C clock frequency supported by the 24LC02BHT-I/SN, and under what conditions?

The 24LC02BHT-I/SN supports up to 400 kHz I²C clock frequency when VCC is 2.5 V or higher. At VCC < 2.5 V, the maximum clock rate drops to 100 kHz - a hard limit enforced by internal timing margins. This dual-speed specification is documented in Table 1-2 of the DS20002105B datasheet and applies strictly to the 24LC02BH variant; the 24LC02BHT-I/SN part marking confirms it is a 24LC02BH-family device with industrial temp grade and SOIC-8 packaging.

Is the 24LC02BHT-I/SN AEC-Q100 qualified, and what does that qualification cover?

Yes, the 24LC02BHT-I/SN is AEC-Q100 qualified - specifically Grade 3 (–40°C to +85°C), matching its industrial temperature rating. This qualification covers stress testing for human-body-model ESD (>4 kV), latch-up immunity, temperature cycling, and high-temperature operating life, validating suitability for automotive body electronics. The qualification applies to the full 24LC02BH family, including the SN package variant, and is documented in Microchip's official AEC-Q100 reports referenced in DS20002105B.