ET-A13
24LC256 EEPROM 32 KB
Non-volatile I²C memory with 4 addresses, Qwiic
AED 17.00
Out of stockOverview
Non-volatile I²C memory with 4 addresses, Qwiic
The ET-A13 is built around the Microchip 24LC256 — 32KB, 64-byte page, 5ms write, 1M erase cycles, 200-year retention. It connects over I²C 400kHz (0x50–0x53 (A0/A1 jumpers)) and is powered from 2.5–5.5V.
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
- Saving settings and calibration
- Small logs
- Device IDs
Key features
What makes it different
Memory
Microchip 24LC256: 32KB, 64-byte page, 5ms write, 1M erase cycles, 200-year retention
Interface
I2C 400kHz, 0x50–0x53 (A0/A1 jumpers)
Supply
2.5–5.5V
Libraries
SparkFun External EEPROM, Arduino Wire, Linux at24
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
| Memory | Microchip 24LC256: 32KB, 64-byte page, 5ms write, 1M erase cycles, 200-year retention |
|---|---|
| Interface | I2C 400kHz, 0x50–0x53 (A0/A1 jumpers) |
| Supply | 2.5–5.5V |
| 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 | 24LC256T-I/SN (LCSC C5458) |
| Revision | Rev A |
| Libraries | SparkFun External EEPROM, Arduino Wire, Linux at24 |
|---|
| 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
Endurance
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
In the box
- 1 × ET-A13 24LC256 EEPROM 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: SparkFun External EEPROM, Arduino Wire, Linux at24
- Run an I²C scanner to confirm the address: 0x50, 0x53
Compare
Which memory board?
| 24LC256 EEPROM 32 KB (this board)This board | ET-A14 MB85RC256V FRAM 32 KB | |
|---|---|---|
| What it does | Non-volatile I²C memory with 4 addresses, Qwiic | Fast I²C memory with a trillion write cycles, Qwiic |
| Interface | I²C 400kHz, 0x50–0x53 (A0/A1 jumpers) | I²C 1MHz, 0x50–0x53 (A0/A1) |
| Best for | Saving settings and calibration | High-rate data logging |
| Price | 17 AED | 29 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.