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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 #

    • 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 #

1- Compatible with BreadBoard

2- On Board 2A Switching Regulator

3- On Board NanoSIM(4FF) socket

4- BT Antenna on board

5- GNSS active antenna circuit

Development Board Configuration #

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
EICUT MINI DB (SIM800) — SIM slot, Bluetooth pad, external GSM antenna, dual 10-pin headers, USB test point, NETLIGHT/Power LEDs.
Top view with callouts: SIM card, BT pad, external GSM antenna, two 10-pin headers, USB test point, NETLIGHT & Power LEDs.

 

Development Board Dimensions #

EICUT MINI DB (SIM800) — mechanical dimensions 32.6×26 mm with GSM/BT antenna offsets and SIM spacing.
Dimensioned top view in millimeters: board 32.6×26; GSM ANT 20.3; BT ANT 5.4; SIM slot 14 mm (7 mm margins).

 

Development Board Interfaces #

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

SIM800C Mini DB P1-P2 #

EICUT MINI DB (SIM800) pinout—audio MIC/MICN/LOUT/SPKP, ADC, RI/CTS; UART UTX/URX & TX/RX; DTR/DCD/RTS; VRTC; +5/GND.
Pins labeled: audio I/O, ADC, RI/CTS; UART UTX/URX & TX/RX; DTR/DCD/RTS; VRTC; +5/GND.

 

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 to power up and turn on automatically without the need for a turn-off function.

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

What are the board dimensions?
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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

 

Add to Cart – SIM800C mini DB
Updated on November 19, 2025

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