---
title: 2FF Dual Simcard switch
description: "## Basic Overview The Switch Simard Is a compact and integrated development board designed specifically to be used on products and save a lot of time handling GSM & GNSS power circuits and etc. ## Feature List - Dual SIM,…"
url: "https://eicut.com/wiki/development-boards/2ff-dual-simcard-switch/"
updated: "2026-02-14"
category: Development Boards
---

# 2FF Dual Simcard switch

## Basic Overview

The Switch Simard Is a compact and integrated development board designed specifically to be used on products and save a lot of time handling GSM & GNSS power circuits and etc.

## Feature List

- Dual SIM, Single Standby
- Easy Switching
- Compatible with Breadboard
- Surge Protection 5A
- On Board MiniSIM(2FF) socket

## Development Board Resources

### Function Description

The main component and interface placement of the development board is shown in the following figure:

![Top/bottom views of EICUT 2FF dual SIM card switch board](https://eicut.com/wp-content/uploads/2025/10/image1_11zon-680x1024.webp)
**Top/bottom views **

### Development Board Configuration

The detailed assignment of the peripheral interfaces on the Development board is as follows:

| NO. | Name | Silkscreen | Comment |
| --- | --- | --- | --- |
| **1** | 4pin | P3 | Header 2.54 mm |
| **2** | 6pin | P2 | Header 2.54 mm |
| **3** | Dual Sim card case | – | 2FF SIM Card |
| **4** | FPC Connector | P1 | FPC 6pin |

### Development Board Interfaces

 

![2FF Dual Simcard switch pinout](https://eicut.com/wp-content/uploads/2025/10/image3_11zon-1024x700.webp)
**Pin map**

| NO. | Name | Silkscreen | Comment |
| --- | --- | --- | --- |
| **P3‑1** | Ground | GND | – |
| **P3‑2** | Select | Sel | 0 – Power |
| **P3‑3** | Power | VCC | 1.65–4.3 V |
| **P3‑4** | Ground | GND | – |
| **P2‑1** | VSIM | VSIM | These pins are similar to the pins of the FPC connector. You can use them if you do not use the FPC connector. |
| **P2‑2** | VCC | VCC | – |
| **P2‑3** | RST | RST | – |
| **P2‑4** | CLK | CLK | – |
| **P2‑5** | DATA | DATA | – |
| **P2‑6** | Simcard-GND | SIMG | – |

For switching between two SIM cards, you can connect the Select pin (pin header P3) to ground or VCC manually with a jumper, or you can control this pin using a microcontroller to set it high or low.

## Development Board Dimensions

The main pin placement of the Development board is shown in the following figure:

![EICUT 2FF Dual Simcard switch dimensions](https://eicut.com/wp-content/uploads/2025/10/image2_11zon-911x1024.webp)
**Dimensioned top view in board: 40×30 mm **

 

## Getting Started Preparation

**Step 1**: Connect the board power

**Step 2**: Place the SIM cards in the SIM card case

**Step 3**: Switch between SIM cards by High and Low the select pin

**Step 4**: Connect the board to your microcontroller with the FPC connector or the header pin(P2)

## Resource Download

- [onsemi-FSA2567MPX](https://eicut.com/wp-content/uploads/2025/10/onsemi-FSA2567MPX.pdf)
- [Switch simcard DB schematic ](https://eicut.com/wp-content/uploads/2025/10/switch-simcard-schematic.pdf)

## FAQ

    What is the Switch Simcard board used for?

This is a **dual SIM single-standby analog switch** board (based on **onsemi FSA2567/FSA2568**) that allows you to connect **two Mini-SIM (2FF)** cards to a single cellular module and switch between them instantly.

    How many SIM cards can be connected?

**Two full-size Mini-SIM (2FF)** cards. Only one is active at a time (single standby).

    How to switch between the two SIM cards?

Control the **SEL pin** (P3-2):
 • **Low (0 V)** → SIM 1 active
 • **High (VCC)** → SIM 2 active
 You can switch manually with a jumper or via any **GPIO** from your microcontroller.

    What voltage should I supply to the board?

Connect the same **SIM voltage** your module uses to **VCC** (P3-3): **1.65 V – 4.3 V** (typically 1.8 V or 2.9 V). The board has built-in **5 A surge protection**.

    How to connect it to my GSM module?

Two options:
 • Use the **6-pin FPC connector** (P1) with a 6-pin FPC cable
 • Solder wires directly to the **6-pin header** (P2): VSIM, VCC, RST, CLK, DATA, SIMG

    Is the board breadboard compatible?

Yes – **2.54 mm headers** (P2 & P3) fit perfectly in any standard breadboard.

    Does it support Nano-SIM (4FF)?

No – only **Mini-SIM (2FF)** cards are supported natively. Use a 2FF-to-4FF adapter if needed.

    What are the board dimensions?

Compact size: **40 × 30 mm** with mounting holes.

    Is any level shifter or extra component needed?

No – the board is a pure **analog switch** with **no MCU** or level translation. Just connect power, SEL, and SIM signals directly.

    Can I switch SIM cards while the module is powered?

Yes – hot-switching is supported. The module will detect the new SIM automatically after a few seconds 

[![FSA2568 Dual Sim Card Analog Switch, for 2FF USIM, FPC Cable support](https://eicut.com/wp-content/uploads/2025/10/Frame-30_11zon-273x300.webp)](https://eicut.com/product/fsa2568-dual-sim-card-analog-switch)