256K (32 K x 8) Bit SPI

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MB85RS256TY is a FRAM (Ferroelectric Random Access Memory) chip in a configuration of 32,768 words x 8 bits, using the ferroelectric process and silicon gate CMOS process technologies for forming the nonvolatile memory cells. This product is specifically targeted for high-temperature environment such as automotive applications.

MB85RS256TY adopts the Serial Peripheral Interface (SPI).

The MB85RS256TY is able to retain data without using a back-up battery, as is needed for SRAM.

The memory cells used in the MB85RS256TY can be used for 1013 read/write operations, which is a significant improvement over the number of read and write operations supported by Flash memory and E²PROM.

As MB85RS256TY does not need any waiting time in writing process, the write cycle time of MB85RS256TY is much shorter than that of Flash memories or E²PROM.

Symmetry Electronics is an authorized Fujitsu Electronics distributor.


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Bit configuration : 32,768 words x 8 bits
Serial Peripheral Interface : SPI (Serial Peripheral Interface)
Correspondent to SPI mode 0 (0, 0) and mode 3 (1, 1)
Operating frequency : 33 MHz (Max)
High endurance : 1013 times / byte
Data retention : 10 years (+85 C), 1 to 3 (TBD) years (+125 C)
Operating power supply voltage : 1.8 V to 3.6 V
Low power consumption : Operating power supply current 2.3 mA (Max@33 MHz)
Standby current 50 A (Max)
Sleep current 12 A (Max)
Operation ambient temperature range : -40 C to +125 C
Package : 8-pin plastic SOP (FPT-8P-M10)
AEC-Q100 Grade 1 compliant
RoHS compliant

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256K (32 K x 8) Bit SPI
256K (32 K x 8) Bit SPI