16Kbit serial EEPROM with a wide supply net
The ROHM BR93L86RFJ-WE2 is a 16Kbit serial EEPROM organized as 1K x 16 bits, accessed through a Microwire (three-wire) interface running at up to 2 MHz. It operates from a single 1.8V to 5.5V supply, covering both legacy 5V logic and modern 3.3V or 1.8V core rails without a level translator.
The 2 MHz clock rate on the Microwire bus translates to a theoretical 2 Mbit/s serial throughput. For a 16-bit word, that is about 125,000 read operations per second, minus protocol overhead. That is fast enough for parameter storage, calibration tables, or firmware patch staging in most MCU-based designs. If your application needs to stream data faster than that — say, logging sensor data at 100 kHz — you will need a parallel or SPI-based memory instead.
Supply range and write-cycle timing
The 1.8V to 5.5V supply range is wide enough to bridge a 3.3V MCU and a 5V legacy sensor bus on the same rail without a secondary regulator. The write cycle time is 5 ms per word or page, which means a full 1K x 16 memory rewrite takes about 5 seconds if you write every word sequentially. That is acceptable for infrequent calibration updates but too slow for real-time data logging. Keep the 5 ms write time in your firmware timing budget — do not poll the part during a write cycle or you risk corrupting the data.
Package and assembly check
The part is also available in Cut Tape for prototyping. The small 8-pin footprint is common and easy to route; no special thermal considerations apply at the rated 85°C ambient.