What this 1Kbit Microwire EEPROM brings to the board
The Microchip 93LC46CT-I/SN is a 1Kbit serial EEPROM using the Microwire interface — a three-wire bus (clock, data in, data out) that is simple to bit-bang from any microcontroller. It stores 128 x 8 or 64 x 16 bits, selectable by the ORG pin, so you can match the word width to your firmware's data structure without extra glue. The 3 MHz clock rate keeps read bursts snappy for calibration tables or serial numbers.
Field-swap note
If you are replacing this on site, the 8-SOIC body is 3.90 mm wide — fits the usual SOIC-8 footprint. No special ESD precautions beyond the standard wrist strap; the Microwire interface is tolerant enough that a brief misorientation on the first try usually does not latch up. Write cycle time is 6 ms per word or page, so after programming, wait that long before reading back to confirm the data stuck.