1Kbit Microwire EEPROM — configuration memory for industrial and battery-powered designs
The Microchip 93AA46B-I/SN is a 1Kbit serial EEPROM organized as 64 x 16 bits, accessed through a Microwire interface. The 2 MHz clock frequency supports moderate-speed read and write operations, while the 6 ms write cycle time per word or page is typical for this density class.
Supply voltage and temperature — what the range means for your BOM
The 1.8V to 5.5V supply range covers both low-voltage battery operation (down to 1.8V) and legacy 5V logic rails without a level shifter. If your design needs extended temperature above 85°C or below -40°C, this part is not rated for it.
Microwire interface — bus timing and write cycle
The Microwire interface uses a dedicated clock (SK), data input (DI), and data output (DO) line, plus a chip-select (CS). At 2 MHz, each bit transfers in 500 ns, so a full 16-bit word read takes about 8 µs plus access overhead. The 6 ms write cycle time is the period during which the EEPROM internally programs the memory array; the host must wait for the READY/BUSY status (polled via CS) before starting the next operation. This is typical for serial EEPROMs of this generation and is not a fast-page-write device.
Package and delivery — 8-SOIC in Tube
The Tube delivery form is standard for low-to-medium volume production and hand-assembly; if your line uses tape-and-reel feeders, order the -I/ST variant (TSSOP) or check for a reel option under a different ordering code. The package is ROHS3 compliant with no exemptions.
Lifecycle and sourcing posture
The part is ROHS3 compliant. No official successor or second-source alternate is recorded in the manufacturer's cross-reference, but the 93LC46A-I/ST (same density, 2.5V minimum supply, TSSOP-8 package) is a functional peer for designs that can tolerate the higher Vcc floor and different footprint.