Active 1Kbit serial EEPROM in 8-SOIC
The Microchip 93LC46BXT-I/SN is a 1Kbit serial EEPROM organized as 64 x 16 bits, communicating over the Microwire bus at up to 2 MHz.
Microwire bus — what the 2 MHz clock means for your controller
The Microwire interface is a three-wire serial bus (SI, SO, SK) with a dedicated chip-select line. At 2 MHz, a full 16-bit read or write cycle completes in about 8 µs, fast enough for configuration storage, calibration constants, or small lookup tables. The write-cycle time is 6 ms per word or page, so bulk writes need a software delay or status-polling routine. If your MCU lacks a dedicated Microwire peripheral, a bit-banged SPI master works — just match the clock polarity and the 16-bit instruction word format.
It is fully RoHS3 compliant, with no exemptions. The base product number 93LC46 covers multiple density and temperature variants — verify the suffix for your specific operating range and packaging.
Marking and date-code traceability
As a Tape & Reel part, the 93LC46BXT-I/SN ships with a reel label carrying the date code and lot traceability. The laser-etched marking on the 8-SOIC body should match the Microchip standard font for the plant and week of manufacture. For procurement, cross-check the date code on the reel label against the marking — any mismatch flags a potential re-marked or gray-market unit.