The STMicroelectronics M95320-DFDW6TP is a 32 Kbit serial EEPROM accessed through an SPI bus at up to 20 MHz. It stores non-volatile data organized as 4K x 8 bits, with a page-write cycle time of 5 ms. The 8-TSSOP package (0.173-inch body, 4.40 mm width) is a compact surface-mount footprint suited for space-constrained industrial and consumer PCBs.
20 MHz SPI clock — bus timing headroom
The 20 MHz SPI clock rate sets the read throughput ceiling at roughly 2.5 MB/s (20 MHz / 8 bits per byte). That is fast enough to stream calibration tables or configuration blocks without stalling the host controller, but not intended for high-speed data logging — that role belongs to serial NOR Flash. The SPI interface is standard mode 0/3 compatible, so it mates directly with most MCU SPI peripherals. The write cycle time of 5 ms per page or word means the bus is occupied during the write; the host must poll the status register or wait the full 5 ms before issuing the next command.
The SPI I/O pins are referenced to VCC, so the host's SPI voltage must match the EEPROM's supply.
The operating temperature range covers the industrial standard: -40°C to 85°C. If the application sees sustained junction temperatures above 85°C, the automotive-grade sibling M95080-DRMN8TP/K (AEC-Q100, -40°C to 105°C) is the appropriate cross-shop candidate — though that part is 8 Kbit, not 32 Kbit.