4Kbit Microwire EEPROM — what it holds and how fast it moves
The ROHM BR93L66FV-WE2 is a 4Kbit serial EEPROM organized as 256 words by 16 bits, accessed through a Microwire interface at a 2 MHz clock frequency. This is a non-volatile memory for storing calibration constants, configuration tables, or small firmware patches that need to survive power loss.
That is a real BOM simplification when the rest of the logic runs at 3.3V but an older sensor or actuator still uses 5V.
Package and footprint — what you need to know for layout
Housed in an 8-SSOP-B (8-LSSOP, 4.40 mm body width), this is a surface-mount part with a 1.27 mm pin pitch. No thermal pad to worry about — dissipation is low for an EEPROM, so standard FR-4 copper pour is fine.
Lifecycle and supply — active, no LTB pressure
For dual-sourcing, the BR93G46FVM-3AGTTR is a functional alternative at 1Kbit (64 x 16) with a 3 MHz clock — same Microwire interface and package footprint, but half the storage, so verify your firmware fits before swapping.