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 #

1- Dual SIM, Single Standby

2-Easy Switching

3- Compatible with Breadboard

4- Surge Protection 5A

5- 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:

EICUT 2FF dual SIM card switch board—FPC connector, dual 2FF SIM holder, 4-pin and 6-pin headers. — Top/bottom views with callouts: dual 2FF SIM holder, FPC connector, 4-pin power/SEL header, 6-pin signal header.

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 #

Development board dimensions:

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

EICUT 2FF dual SIM switch — mechanical dimensions 40×30 mm with FPC connector and mounting-hole (R1.5) offsets. — Dimensioned top view in board: 40×30 mm ; FPC 13.15; hole R1.5; key offsets 17.5/17.3/20/35/8/1.9/25.

Simcard Switch #

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.

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 #

FAQ #

What is the Switch Simcard board used for?
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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?
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Two full-size Mini-SIM (2FF) cards. Only one is active at a time (single standby).

How to switch between the two SIM cards?
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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?
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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?
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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?
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Yes – 2.54 mm headers (P2 & P3) fit perfectly in any standard breadboard.

Does it support Nano-SIM (4FF)?
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No – only Mini-SIM (2FF) cards are supported natively. Use a 2FF-to-4FF adapter if needed.

What are the board dimensions?
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Compact size: 40 × 30 mm with mounting holes.

Is any level shifter or extra component needed?
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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?
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Yes – hot-switching is supported. The module will detect the new SIM automatically after a few seconds

Add to Cart – FSA2568 Dual Sim Card

Updated on November 19, 2025

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