256K bit FRAM with SPI serial interface - SOP8 T&R

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Lead Time 12 weeks
RoHS Status:
Unit Price:$1.98
Minumum Qty: 1500
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MB85RS256B is a 256K bit FRAM (Ferroelectric Random Access Memory) chip in a configuration of 32,768 words ×8 bits, using the ferroelectric process and silicon gate CMOS process technologies for forming the nonvolatile memory cells.

MB85RS256B adopts the Serial Peripheral Interface (SPI).

The MB85RS256B is able to retaindata without using a back-up battery, as is needed for SRAM.

The memory cells used in the MB85RS256B can be used for 1012 read/write operations, which is a significant improvement over the number of read and write operations supported by Flash memory and E²PROM. MB85RS256B does not take long time towrite data like Flash memories or E²PROM, and MB85RS256B takes no wait time.

Fujitsu MB85RS256B.jpg

Symmetry Electronics (and its e-commerce division: SemiconductorStore.com) is an authorized Fujitsu distributor.


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Bit configuration : 256K bits (32,768 words 8) bits
SPI (Serial Peripheral Interface)
- Correspondent to SPI mode 0 (0, 0) and mode 3 (1, 1)
Operating frequency : All commands except READ 33 MHz (Max)
- READ command 25 MHz (Max)
High endurance : 10^12 times / byte
Data retention : 10 years ( +85 C), 95 years ( +55 C), over 200 years ( +35 C)
Operating power supply voltage : 2.7 V to 3.6 V
Low power consumption : Operating power supply current 6 mA (Typ@33 MHz)
- Standby current 9μA (Typ)
Operation ambient temperature range : -40 C to +85 C
Package : 8-pin plastic SOP (FPT-8P-M02)
- RoHS compliant


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Operating Temp
-40 to +85 °C
Package Details
8-pin SOP
RAM Size
256 KBytes
3.6 MAX V
2.7 MIN V

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