---
title: SIM800C Mini DB
description: "## 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…"
url: "https://eicut.com/wiki/development-boards/introduction-to-sim800c-mini-db/"
updated: "2026-02-15"
category: Development Boards
---

# 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:

![EICUT SIM800C Mini DB — Function Description](https://eicut.com/wp-content/uploads/2025/10/image1_11zon-1-797x1024.webp)
**SIM800C Mini DB Top view**

| 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](https://eicut.com/wp-content/uploads/2025/10/image3_11zon-1-1024x759.webp)
**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.

## B**oard** Dimensions

![EICUT SIM800C Mini DB mechanical dimensions ](https://eicut.com/wp-content/uploads/2025/10/image2_11zon-1-651x1024.webp)
**Dimensioned top view in millimeters: 32.6×26 mm**

 

## Resource Download

- [SIM800C Mini DB Schematic](https://eicut.com/wp-content/uploads/2025/10/SIM800-MINI-DB-schematic.pdf)
- [SIM800C_SPEC](https://eicut.com/wp-content/uploads/2025/10/SIM800C_SPEC.pdf)

## 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**

[![SIM800C mini Development Board Supporting Quad-band GSM/GPRS/GNSS/GPS](https://eicut.com/wp-content/uploads/2025/10/Frame-29_11zon-273x300.webp)](https://eicut.com/product/sim800c-mini-development-board/)