Automotive ICs

125°C Operation SPI Serial EEPROM for Automotive S-25A640B

This IC is a SPI serial EEPROM which operates under the high temperature, at high speed, with the wide range operation for automotive components. This IC has the capacity of 64 K-bit and the organization of 8192 words × 8-bit. Page write and Sequential read are available.

Caution: Before using the product in automobile control unit or medical equipment, it is imperative to contact our sales representatives.


Operating voltage range
Read: 2.5 V to 5.5 V
Write: 2.5 V to 5.5 V
Operation frequency
6.5 MHz max.
Write time
5.0 ms max.
SPI mode (0, 0) and (1, 1)
Page Write
32 bytes / page
Sequential read
Write protect
Software, Hardware
Protect area: 25%, 50%, 100%
Monitoring of a write memory state by the status register
Function to prevent malfunction by monitoring clock pulse
Write protect function during the low power supply voltage
CMOS schmitt input
( CS , SCK, SI,WP , HOLD )
106 cycle / word*1（Ta = +25°C )
3 × 105 cycle / word*1（Ta = +125°C )
Data retention
100 years (Ta =＋25℃)
50 years (Ta =＋125℃)
Memory capacitance
64 Kbit
Initial delivery state
FFh, SRWD = 0, BP1 = 0, BP0 = 0
Burn-in specification
Wafer level burn-in
Operation temperature range
Ta = −40°C to +125°C 
Lead-free(Sn 100%), halogen-free
AEC-Q100 qualified*2 

*1. For each address (Word: 8 bits)
*2. Contact our sales representatives for details.