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Microchip Technology 24CW640T-I/SN — Memory (DRAM / SRAM / Flash / EEPROM)

Microchip 24CW640T-I/SN 64Kbit I²C EEPROM, 1 MHz, 8-SOIC

MPN24CW640T-I/SN
End of Life

Microchip 24CW series, 24CW640T-I/SN, 64Kbit I²C EEPROM, 1 MHz clock, 450 ns access, 1.6V to 5.5V supply, 8K x 8 organization, -40°C to 85°C, 8-SOIC.

$0.46Ref. price · indicative, final on quote
Packaging8-SOIC (0.154", 3.90mm Width)
Series24CW
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

24CW640T-I/SN specifications
ParameterValue
Series24CW
Memory typeNon-Volatile
MountingSurface Mount
Supply voltage1.6V ~ 5.5V
Clock frequency1 MHz
Memory interfaceI²C
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
TechnologyEEPROM
Access time450 ns
Memory size64Kbit
Memory formatEEPROM
Case8-SOIC (0.154\", 3.90mm Width)
Memory organization8K x 8
Write cycle time - word, page5ms

Product details

It operates from a single 1.6V to 5.5V supply, making it suitable for both low-voltage battery-powered designs and legacy 5V buses. The 1 MHz clock frequency supports fast-mode plus I²C, and the 450 ns access time keeps read latency low for calibration or configuration data.

Supply voltage and bus compatibility

It is compatible with 5V I²C buses as long as the pull-up resistors reference the EEPROM's VCC — a common integration point for mixed-voltage systems.

Write cycle time and endurance

The 24CW series is rated for 1 million write cycles and 200-year data retention per Microchip's standard EEPROM qualification — sufficient for frequent calibration updates or serial-number storage over a decade-long product life.

Frequently asked questions

What is the closest functional second-source for 24CW640T-I/SN?

The AT24CS64-MAHM-T is a 64 Kbit I²C EEPROM with similar density and a 1 MHz interface, but its supply range starts at 1.7V and access time is 550 ns versus 450 ns. The 24CW640T-I/SN's 1.6V minimum gives an edge for single-cell battery designs.