24LC08BH-E/ST

Memory IC Overview

The Microchip Technology 24LC08BH-E/ST is an 8 Kbit Electrically Erasable PROM organized as four blocks of 256 x 8-bit memory. It features a 2-wire I2C compatible serial interface with a maximum clock frequency of 400 kHz for VCC between 2.5V and 5.5V, or 100 kHz below 2.5V. The device operates within a supply voltage range of 2.5V to 5.5V and supports industrial (-40°C to +85°C) and automotive (-40°C to +125°C) temperature grades. Key electrical characteristics include a maximum read current of 1 mA, standby current of 1 µA (industrial) or 5 µA (automotive), and data retention exceeding 200 years.

Memory IC Feature Summary

• Hardware write-protect capability locks the upper half of the memory array (addresses 200h-3FFh) when the WP pin is tied to VCC.
• Schmitt trigger inputs on SCL and SDA lines provide noise suppression and spike filtering for reliable operation in noisy environments.
• Internal self-timed erase/write cycles utilize a 16-byte page write buffer to improve bus throughput efficiency.
• Low-power CMOS technology ensures minimal active and standby currents suitable for battery-powered applications.

Memory IC Applications

• Automotive electronic systems requiring extended temperature range reliability
• Industrial control devices needing persistent parameter storage
• Embedded systems utilizing I2C interfaces for configuration data
• Battery-operated equipment requiring low standby power consumption

Memory IC Procurement Notes

Verify that the ordering suffix 'E' corresponds to the Automotive temperature grade (-40°C to +125°C) rather than the Industrial grade ('I'). Confirm the package type 'ST' matches the required TSSOP-8 footprint. Ensure the design accounts for the specific VCC operating range of 2.5V to 5.5V, as this variant does not support voltages below 2.5V unlike the 24AA08H series.

Memory IC Selection Notes

Select this component when automotive-grade temperature stability is required alongside standard I2C compatibility. The 24LC08BH-E/ST differs from the 24LC08B series by offering enhanced thermal endurance up to 125°C. Designers must ensure the system voltage remains above 2.5V to maintain 400 kHz clock speeds. The hardware write-protect feature is critical for applications preventing accidental modification of stored calibration data.

Memory IC Part Context

This part belongs to the 24AA08H/24LC08BH family of 8 Kbit serial EEPROMs. It shares architectural similarities with the 24LC08B but provides extended automotive temperature specifications. The 'BH' designation indicates the inclusion of half-array write protection and Schmitt trigger inputs. It serves as a direct upgrade for designs previously using standard industrial EEPROMs in high-temperature automotive environments.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: 24LC08BH-I/ST (Industrial grade equivalent).

Memory IC FAQ

How does the WP pin function affect memory access?

When the WP pin is connected to VCC, write operations are inhibited for the upper half of the memory array (addresses 200h-3FFh). Read operations remain unaffected regardless of the WP pin state.

What is the difference in clock frequency based on supply voltage?

For the 24LC08BH series, the maximum clock frequency is 400 kHz when VCC is between 2.5V and 5.5V. If VCC drops below 2.5V, the maximum clock frequency is limited to 100 kHz.