Microchip Technology 24LC08BH-I/SN

Overview

24LC08BH-I/SN from Microchip Technology Inc. is an 8 Kbit I²C-compatible serial EEPROM organized as four 256 × 8-bit memory blocks, operating from 2.5V to 5.5V with industrial temperature range (–40°C to +85°C), 400 kHz max clock frequency, and hardware write-protect for addresses 200h–3FFh. It supports page writes up to 16 bytes and delivers ≤1 mA active current and ≤10 µA standby current in industrial grade.

For engineers reviewing the 24LC08BH-I/SN datasheet, 24LC08BH-I/SN pinout, 24LC08BH-I/SN application, or 24LC08BH-I/SN equivalent, key selection criteria include VCC min (2.5V), half-array write-protection via WP pin, I²C timing compliance at 400 kHz, and SOIC-8 package compatibility with standard PCB footprints.

Technical Context

The 24LC08BH-I/SN implements a slave-only I²C interface with fixed 7-bit device address prefix '1010' and 3-bit block-select bits (B2–B0), enabling access to four independent 256-word memory blocks. Its internal address pointer auto-increments during sequential reads and page writes, supporting current-address, random, and sequential read modes.

Write protection is implemented via the WP pin: tied to VCC, it disables writes to the upper half of memory (200h–3FFh); tied to VSS, full array access is enabled. Schmitt-trigger inputs on SDA/SCL and built-in noise filtering ensure robust operation on electrically noisy buses without external RC networks.

Key Specifications

Pinout & Package

24LC08BH-I/SN is supplied in an 8-lead plastic SOIC (3.90 mm body) package per JEDEC MS-012, with standard 1.27 mm pitch and 5.0 mm × 3.9 mm footprint. Pin 1 is marked with a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA08H-I/SN and AT24C08D-SSHM-T, the 24LC08BH-I/SN provides optimal balance of industrial temperature stability, predictable 2.5V+ operation, and minimal external component count-making it ideal for fixed-rail embedded systems where voltage headroom is assured and interrupt-latency constraints are relaxed.

Availability

24LC08BH-I/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, consumer appliance control boards, and medical diagnostic instruments requiring stable component supply with guaranteed long-term manufacturability.

Supply support for 24LC08BH-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 microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The 24LC08BH belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in space-constrained embedded systems across industrial, medical, and consumer markets.

FAQ

What is the minimum VCC voltage required for reliable operation of the 24LC08BH-I/SN?

The 24LC08BH-I/SN requires a minimum VCC of 2.5V for guaranteed operation across its full industrial temperature range (–40°C to +85°C). Operation below 2.5V is not specified and may result in incomplete writes, corrupted data, or failure to acknowledge I²C commands. This distinguishes it from the 24AA08H variant, which supports down to 1.7V. The 24LC08BH-I/SN includes an internal VCC threshold detector that disables write operations if supply drops below approximately 1.5V.

How does the WP pin function on the 24LC08BH-I/SN, and what memory region does it protect?

The WP (Write-Protect) pin on the 24LC08BH-I/SN is a hardware-controlled enable for half-array protection. When WP is tied to VCC, write operations to memory addresses 200h–3FFh (the upper 2 Kbytes) are inhibited; reads remain fully functional. When WP is tied to VSS (or left floating, though not recommended), full-array write access is enabled. This protection is active during all write cycles-including page writes-and requires no software configuration, making it ideal for safeguarding calibration data or firmware metadata stored in the protected region.

Can the 24LC08BH-I/SN be used in 400 kHz I²C fast-mode systems, and what are the timing constraints?

Yes, the 24LC08BH-I/SN fully supports 400 kHz I²C fast-mode operation across its specified VCC range (2.5V–5.5V) and industrial temperature range. Key AC parameters include minimum SCL high time (600 ns), minimum SCL low time (1300 ns), and maximum SDA/SCL rise/fall times (1000 ns/300 ns). These values assume bus capacitance ≤400 pF and appropriate pull-up resistors (e.g., 2 kΩ for 400 kHz). The device's Schmitt-trigger inputs and internal noise filtering ensure robust timing margin without external RC networks.

What is the page write capability of the 24LC08BH-I/SN, and how does it affect memory addressing?

The 24LC08BH-I/SN features a 16-byte page write buffer, allowing up to 16 contiguous bytes to be written in a single I²C transaction after one Start condition and word address. Page boundaries align to 16-byte intervals (e.g., 000h–00Fh, 010h–01Fh); crossing a boundary causes wraparound within the current page rather than automatic increment to the next. Therefore, software must ensure the starting address and byte count do not exceed the current page boundary-otherwise, earlier bytes in the page will be overwritten. This behavior is inherent to the device's internal address pointer logic and is documented in Figure 4-2 of the datasheet.

Is the 24LC08BH-I/SN RoHS compliant, and what packaging information is indicated by the '/SN' suffix?

Yes, the 24LC08BH-I/SN is RoHS compliant per EU Directive 2011/65/EU. The '/SN' suffix explicitly denotes the 8-lead plastic SOIC (Small Outline Integrated Circuit) package with 3.90 mm body width and standard JEDEC MS-012 outline. This package uses matte tin (Sn) lead finish and is compatible with standard reflow soldering profiles. Marking on the device includes '24LC08BH', temperature grade 'I', and date code; full traceability is maintained per Microchip's packaging specification DS20002084B.