ET-A14

MB85RC256V FRAM 32 KB

Name: MB85RC256V FRAM 32 KB
Brand: ElectroTrical
SKU: ET-A14
Price: 29.00 AED
Availability: OutOfStock

Fast I²C memory with a trillion write cycles, Qwiic

AED 29.00

Out of stock

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Download datasheet (PDF)

Overview Key features Specifications Performance Pinout

Overview

Fast I²C memory with a trillion write cycles, Qwiic

The ET-A14 is built around the Fujitsu/RAMXEED MB85RC256V — 32KB ferroelectric RAM, 10¹² write cycles, no write delay, 10-year retention. It connects over I²C 1MHz (0x50–0x53 (A0/A1)) and is powered from 2.7–5.5V.

Two Qwiic / STEMMA QT connectors let you chain it with other boards without soldering, and the 2.54 mm header fits a breadboard.

Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.

Good for

High-rate data logging
Counters that survive power loss
Crash-safe state

Key features

What makes it different

Memory

Fujitsu/RAMXEED MB85RC256V: 32KB ferroelectric RAM, 10¹² write cycles, no write delay, 10-year retention

Interface

I2C 1MHz, 0x50–0x53 (A0/A1)

Supply

2.7–5.5V

Libraries

Adafruit_FRAM_I2C, RobTillaart FRAM_I2C

Qwiic / STEMMA QT

Two JST-SH connectors plus a 2.54 mm header — 3.3 V and 5 V hosts.

Open documentation

Schematic, BOM and layout notes published for every board.

Specifications

Technical specifications

Device
Memory	Fujitsu/RAMXEED MB85RC256V: 32KB ferroelectric RAM, 10¹² write cycles, no write delay, 10-year retention
Interface	I2C 1MHz, 0x50–0x53 (A0/A1)
Supply	2.7–5.5V

Board
Size	25.4 × 17.8 mm
Mounting	2 mounting holes (M2.5)
Connectors	2 × Qwiic / STEMMA QT (JST SH 4-pin) · 5-pin 2.54 mm header
Main IC	MB85RC256VPNF-G-AMERE2 (LCSC C45273903)
Revision	Rev A

Software
Libraries	Adafruit_FRAM_I2C, RobTillaart FRAM_I2C

Solder jumpers
JP1 (default Closed)	Cut to turn off the LED
JP2 (default Closed)	Cut to remove the host-side I2C pull-ups
JP3 (default Open)	Bridge → A0 high
JP4 (default Open)	Bridge → A1 high
JP5 (default Open)	Bridge → WP high (lock)

Performance

Write speed

Time to write a 64-byte pageEEPROM needs a 5 ms write cycle; FRAM writes at bus speed (~0.6 ms at 1 MHz). FRAM also lasts 10¹² writes vs 10⁶.

EEPROM (ET-A13)5 ms

FRAM (this board)0.6 ms

Pinout

Pin map and connections

Pin	Name	Type	Function
1	`VIN`	Power	Sensor supply = host logic level
2	`GND`	Ground	Ground
3	`SCL`	I²C	I²C clock
4	`SDA`	I²C	I²C data
5	`WP`	Signal	High = write-protect

Qwiic / STEMMA QT pins: GND, VIN, SDA, SCL (same on both connectors). I²C pull-ups (10 kΩ) are on the board; cut JP2 to remove them.

Mechanical

Dimensions and what's in the box

Board 25.4 × 17.8 mm with M2.5 holes — Top view · 25.4 × 17.8 mm

In the box

1 × ET-A14 MB85RC256V FRAM 32 KB (assembled)
1 × 5-pin 2.54 mm male header, unsoldered

Getting started

Plug in a Qwiic / STEMMA QT cable, or solder the header and wire VIN, GND, SDA and SCL
Libraries: Adafruit_FRAM_I2C, RobTillaart FRAM_I2C
Run an I²C scanner to confirm the address: 0x50, 0x53

Compare

Which memory board?

	MB85RC256V FRAM 32 KB (this board)This board	ET-A13 24LC256 EEPROM 32 KB
What it does	Fast I²C memory with a trillion write cycles, Qwiic	Non-volatile I²C memory with 4 addresses, Qwiic
Interface	I²C 1MHz, 0x50–0x53 (A0/A1)	I²C 400kHz, 0x50–0x53 (A0/A1 jumpers)
Best for	High-rate data logging	Saving settings and calibration
Price	29 AED	17 AED

Downloads

Documents and design files

PDFET-A14 schematicRev A LCSCMB85RC256VPNF-G-AMERE2 datasheet and stockC45273903

STEP3D modelComing soon

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