1Kbit I2C EEPROM in an 8-pin DIP — the hand-solderable non-volatile store
The 24LC01B-I/P is a 1Kbit serial EEPROM organized as 128 x 8 bits, communicating over an I2C bus at up to 400 kHz. The through-hole 8-DIP package (0.300-inch row spacing) is the right choice when you need to socket the memory for firmware prototyping, field upgrades, or low-volume production where a reflow oven isn't on the line. Supply voltage spans 2.5V to 5.5V, so it sits comfortably on a 3.3V or 5V rail without a regulator.
400 kHz I2C bus and 5 ms write cycle — timing budget realities
At 400 kHz the I2C bus delivers a byte-read time around 26 µs (including addressing overhead), but the write cycle — word or page — takes 5 ms. That 5 ms is the blocking period: the bus is held while the EEPROM writes internally. For applications that log data at high rates, the write-cycle time limits throughput to roughly 200 bytes per second per page. Plan your write buffer and polling strategy around that ceiling. Access time is 3.5 µs — the time from the last SCL falling edge to data valid on SDA. That's well within the I2C spec for 400 kHz (minimum SCL low period 1.3 µs), so no timing margin issue on a standard bus.
Microchip lists the 24LC01B-I/P as Active. The ROHS3 compliance covers current EU and UK RoHS exemptions.
Package and supply — what the 8-DIP means for your board
The 8-DIP package (8-PDIP, 0.300-inch body width, 2.54 mm pin pitch) is a standard footprint that fits a wide range of sockets or can be soldered directly into plated through-holes. No moisture-sensitivity level concern — DIP packages are not moisture-sensitive, so no bake step before hand-soldering or wave-solder. The through-hole mount also means the part can be replaced in the field with a soldering iron, which matters for MRO and repair scenarios. Supply range 2.5V to 5.5V covers both 3.3V and 5V logic families without a level shifter. The I2C pins are 5V-tolerant at the higher supply, but check the Vih threshold relative to your MCU's VDD if mixing voltages.