25AA256T-I/ST

Memory IC Overview

The Microchip Technology 25AA256T-I/ST is a 256 Kbit Serial Electrically Erasable PROM accessed via an SPI-compatible serial bus. It features a 32,768 x 8-bit organization with a 64-byte page size and operates within a supply voltage range of 1.8V to 5.5V. The device supports a maximum clock frequency of 10 MHz and includes self-timed erase and write cycles with a maximum duration of 5 ms. It is housed in an 8-lead TSSOP package and is rated for industrial temperature operation from -40°C to +85°C.

Memory IC Feature Summary

• Supports block-level write protection allowing selection of none, one-quarter, one-half, or the entire array.
• Includes built-in power-on/off data protection circuitry and a write enable latch mechanism.
• Features a HOLD input pin that suspends serial communication without resetting the sequence.

Memory IC Applications

• Data storage for microcontroller system parameters
• Configuration memory for embedded devices
• Non-volatile data logging

Memory IC Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature range (-40°C to +85°C) and 'ST' denotes the 8-TSSOP package. Confirm RoHS compliance status as required by your assembly specifications. Ensure the ordering quantity matches the available reel or cut tape options provided by the distributor.

Memory IC Selection Notes

Select this component when an SPI interface is preferred over I2C for higher speed access up to 10 MHz. The 1.8V minimum operating voltage makes it suitable for low-voltage logic systems compared to 2.5V-only EEPROMs. The TSSOP package is appropriate for surface-mount applications requiring a compact footprint.

Memory IC Part Context

This part belongs to the 25XX256 family of 256 Kbit Serial EEPROMs manufactured by Microchip Technology. The family shares identical functional architectures but varies in operating voltage ranges (e.g., 2.5V vs 1.8V) and temperature grades. The 'AA' designation specifically indicates the 1.8V to 5.5V operational range.

Memory IC Replacement Considerations

The 25LC256 is a compatible alternative within the same family, offering identical functionality but restricted to a 2.5V to 5.5V supply voltage range. Verify that the target system voltage remains above 2.5V if substituting this part.