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SIM900A GSM Module SIMCom Datasheet Specifications

FREE-SKY (HK) ELECTRONICS CO.,LIMITED / 11-10 10:22

The SIM900A GSM Module is a compact, cost-effective, and reliable communication solution developed by SIMCom Wireless Solutions for IoT, M2M, and embedded applications. This article will discuss the SIM900A GSM Module’s features, specifications, applications, and more.


Catalog

1. SIM900A GSM Module Overview
2. SIM900A GSM Module Pinout
3. SIM900A GSM Module Alternatives
4. SIM900A GSM Module Functional Block Diagram
5. Circuit Schematic of SIM900A GSM Module
6. SIM900A GSM Module Board
7. SIM900A GSM Module Specifications
8. SIM900A GSM Module Features
9. SIM900A GSM Module Applications
10. SIM900A vs. SIM800L vs. SIM800A
11. SIM900A GSM Module Mechanical Dimensions
12. Advantages and Limitations
13. Manufacturer
14. Conclusion
SIM900A

SIM900A GSM Module Overview

The SIM900A GSM Module is a compact and reliable GSM/GPRS solution designed for IoT, M2M, and embedded applications. It supports dual-band frequencies (EGSM 900 MHz and DCS 1800 MHz), ensuring broad network compatibility. With a built-in TCP/IP stack, it allows seamless internet connectivity through simple AT commands, making it ideal for remote data transfer, telemetry, and control systems. Its small 24 x 24 x 3 mm form factor makes it suitable for space-limited devices such as smart meters, tracking systems, and handheld equipment.

Engineered for efficiency, the SIM900A consumes as little as 1.5 mA in sleep mode, extending battery life in portable applications. It offers a 68-pin SMT interface, providing flexible connections for serial communication, audio, keypad, and GPIO functions. Easy to integrate and cost-effective, it remains a trusted module for reliable wireless communication.

If you are interested in purchasing the SIM900A GSM Module, feel free to contact us for pricing and availability.

SIM900A GSM Module Pinout

Pin No.
Pin Name
Description
1
PWRKEY
Power on key input
2
PWRKEY_OUT
Power key output
3
DTR
Data terminal ready
4
RI
Ring indicator
5
DCD
Data carrier detect
6
DSR
Data set ready
7
CTS
Clear to send
8
RTS
Request to send
9
TXD
Transmit data
10
RXD
Receive data
11
DISP_CLK
Display clock signal
12
DISP_DATA
Display data signal
13
DISP_CS
Display chip select
14
DISP_DC
Display data/command control
15
VDD_EXT
External 2.8V output
16
NRESET
Module reset input
17
GND
Ground
18
MIC_P
Microphone positive input
19
MIC_N
Microphone negative input
20
SPK_P
Speaker positive output
21
SPK_N
Speaker negative output
22
LIN_P
Line input positive
23
LIN_N
Line input negative
24
ADC
Analog-to-digital converter input
25
DBG_TXD
Debug transmit
26
DBG_RXD
Debug receive
27
SIM_VDD
SIM card voltage supply
28
SIM_DATA
SIM data signal
29
SIM_CLK
SIM clock signal
30
SIM_RST
SIM reset signal
31
SIM_PRESENCE
SIM card presence detection
32
SDA
I2C data line
33
SCL
I2C clock line
34
PWM1
Pulse width modulation output 1
35
PWM2
Pulse width modulation output 2
36
GPIO1/KBR0
GPIO or keypad row 0
37
GPIO2/KBR1
GPIO or keypad row 1
38
GPIO3/KBR2
GPIO or keypad row 2
39
GPIO4/KBR3
GPIO or keypad row 3
40
GPIO5/KBR4
GPIO or keypad row 4
41
GPIO6/KBC0
GPIO or keypad column 0
42
GPIO7/KBC1
GPIO or keypad column 1
43
GPIO8/KBC2
GPIO or keypad column 2
44
GPIO9/KBC3
GPIO or keypad column 3
45
GPIO10/KBC4
GPIO or keypad column 4
46
GPIO11/KBC5
GPIO or keypad column 5
47
GPIO12/KBC6
GPIO or keypad column 6
48
GPIO13/KBC7
GPIO or keypad column 7
49
STATUS
Module status output
50
NETLIGHT
Network indicator output
51
ANT
Antenna connection
52
VBAT
Power supply input
53
VBAT
Power supply input
54–68
GND
Ground

SIM900A GSM Module Alternatives

Module
Network Type
Frequency Bands
Key Features
Use Case
SIM800L
2G GSM/GPRS
Quad-band (850 / 900 / 1800 / 1900 MHz)
Small size, low power, built-in TCP/IP
Direct upgrade to SIM900A, suitable for IoT and GSM-based communication
SIM900
2G GSM/GPRS
Quad-band (850 / 900 / 1800 / 1900 MHz)
Similar AT command set, TCP/IP stack
Almost identical to SIM900A but with wider global network compatibility
SIM808
2G GSM/GPRS + GPS
Quad-band (850 / 900 / 1800 / 1900 MHz)
GPS tracking + GSM functions
Ideal for vehicle tracking and navigation projects
SIM7600E / SIM7600G
4G LTE / 3G / 2G fallback
Multiple LTE bands
High-speed data, GNSS, SMS, voice
Future-proof option for IoT and industrial data systems
QUECTEL M95
2G GSM/GPRS
Quad-band (850 / 900 / 1800 / 1900 MHz)
Compact, efficient, TCP/IP, extended temperature range
Reliable alternative for industrial GSM connectivity
SIM7600G-H
4G LTE (Cat 4)
Global LTE bands
Fast data rate, GPS, SMS, voice
Advanced IoT systems requiring 4G performance
SIM7080G
LTE Cat-M / NB-IoT / 2G fallback
Multiple LTE-M/NB bands
Low power, global connectivity, integrated GNSS
Best for modern low-power IoT applications
Siemens MC55 / MC46
2G GSM/GPRS
Dual / Tri-band
Stable and legacy-supported module
Suitable for older GSM-based systems still in operation


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