SIM800C Mini DB

Basic Overview #

The SIM800C Mini DB is a compact and portable board designed specifically for breadboard. The main equipped modules are the SIM800C Mini DB series wireless communication modules.

Feature List #

Module Features #

Frequency Bands: 850/900/1800/1900MHz
GPRS multi-slot class 12(default)
GPRS multi-slot class 1~12 (option)
Dimensions: 17.6*15.7*2.3mm
Weight: 1.3±0.1g
Supply voltage: 3.4 ~ 4.4V
Operation temperature:-40℃ ~85℃
Compliant GSM phase 2/2+: Class 4 (2W @ 850/900MHz)
Compliant GSM phase 2/2+: Class 1 (1W @ 1800/1900MHz)
Control via AT commands (3GPP TS 27.007, 27.005 & SIMCom enhanced AT Commands)
Low power consumption
GPRS mobile station class B

MiniDB Features #

Compatible with BreadBoard
On Board 2A Switching Regulator
On Board NanoSIM(4FF) socket
BT Antenna on board
GNSS active antenna circuit

Development Board Resources #

Function Description #

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

NO.	Name	Silkscreen	Comment
1	Sim card case	J1	4FF SIM Card 12.3 × 8 mm
2	External Bluetooth Antenna	BT ANT	Johanson Bluetooth Antenna
3	External GSM Antenna	GSM ANT	UFL ANTENNA
4	10pin	P1-P2	Header 2.54 mm
5	USB	USB PORT	USB interface for debugging and firmware upgrades

The Development board has 2 functional indication LEDs, as follows:

D1: NETLIGHT
D2: Power indication LED

Development Board Interfaces #

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

EICUT SIM800C Mini DB pinout — **Pins labeled**

NO.	Name	Silkscreen	Comment
P1-1	Request to send	RTS	You can use it as an output and input.
P1-2	VRTC	VRTC	Power supply for RTC when VBAT is not supplied for the system. Charging for backup battery or golden capacitor when VBAT is applied. For the allowed voltage and current values for this pin, see the bottom of the table.
P1-3	RXD	RX	Receive data
P1-4	TXD	TX	Transmit data
P1-5	DCD	DCD	Digital output
P1-6	DTR	DTR	Digital input
P1-7	NC	NC	Not connect
P1-8	NC	NC	Not connect
P1-9	UART2-TX	AUXTX	Transmit data
P1-10	UART2-RX	AUXRX	Receive data
P2-1	Ground	GND	–
P2-2	CTS	CTS	Clear to send
P2-3	RI	RI	Ring indication
P2-4	ADC0	ADC	General purpose analog to digital converter. Vmax=2.8V, Vmin=0V
P2-5	SPK1P	SPP	Channel 1 positive voice output
P2-6	SPK1N	SPN	Channel 1 negative voice output
P2-7	MICN	MICN	Negative voice input
P2-8	MICP	MICP	Positive voice input
P2-9	Ground	GND	–
P2-10	Power	+5	Main power supply of module. Make sure that supply sufficient current in a transmitting burst typically rises to 1.6A. Vmax=4.8V, Vmin=5.5V

VRTC pin voltage: VImax=3.3V, VImin=1.5V, VInorm=2.8V

VOmax=3V, VOmin=2V, VOnorm=2.8V IOmax=2mA Iin≈10uA

🔗Hint

Make sure the power supply voltage is stable.
The board should power up and turn on automatically without the need for a turn-on function.

Board Dimensions #

EICUT SIM800C Mini DB mechanical dimensions — **Dimensioned top view in millimeters: 32.6×26 mm**

Resource Download #

FAQ #

What is the SIM800C Mini DB?

The SIM800C Mini DB is a breadboard-friendly breakout board for the SIM800C GSM/GPRS module, offering full Quad-Band 2G connectivity in a tiny, easy-to-use package.

Which frequency bands are supported?

Full Quad-Band: 850 / 900 / 1800 / 1900 MHz – global 2G coverage.

Does this board include GNSS or Bluetooth?

No. The SIM800C version supports only GSM/GPRS. It has a Bluetooth antenna pad but Bluetooth is not functional in this module. For GNSS+BT, choose the SIM868 version.

How to power the SIM800C Mini DB?

Supply 5V via the +5 pin (P2-10) or USB port. Onboard 2A switching regulator</ geïn provides stable 3.4–4.4 V. Peak current during TX bursts can reach ~1.6–2 A.

Is an external GSM antenna required?

Yes – connect an antenna to the GSM ANT U.FL connector. No onboard GSM antenna is provided.

How to send AT commands?

Use the main UART (TX/RX) pins (P1-3 & P1-4) or connect via USB (appears as virtual COM port). Full AT command set (3GPP + SIMCom enhanced) is supported.

What do the two LEDs indicate?

• D1 (NETLIGHT): Network status (blinking patterns show searching/registered/idle)
• D2: Power indication (ON when module is powered)

Can I make voice calls?

Yes – differential MICP/MICN inputs and SPKP/SPKN outputs are available for microphone and speaker connection.

What are the board dimensions?

Ultra-compact: 32.6 × 26 mm – perfect for breadboard prototyping and final integration.

What is the operating temperature range?

Industrial grade: −40 °C to +85 °C

Updated on February 15, 2026

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