Subscriber Identity Module (SIM) Card Pinout Diagram

A Subscriber Identity Module (SIM) card is a small electronic card that is inserted into a mobile phone or other compatible devices to identify and authenticate the user on a cellular network. It contains a unique identification number and stores information like the user's phone number, contacts, and other subscriber-related data. The SIM card allows users to make calls, send messages, and access mobile network services provided by their service provider. It is essentially a portable "identity card" for your phone, allowing it to connect to the cellular network and access services specific to your account. You may notice this SIM card has some pins with it. So, in this article, we are going to see the SIM Card PinOut Diagram with each pin function.

According to the above pinout diagram, a standard SIM card typically consists of eight pins arranged in a specific configuration. 

Here is the pinout for a SIM card:

VCC: Power supply voltage (usually +3.3V or +5V).

Reset: Used to reset the SIM card. When this pin is activated, the SIM card goes through a reset sequence, which allows it to initialize and start its operation.

Clock: Clock signal for synchronization. It provides a clock signal that synchronizes data transmission between the SIM card and the device it is inserted into. It ensures proper timing for communication and data transfer.

GND: Ground reference voltage. It is connected to the ground of the device to establish a common reference voltage.

VPP: Programming voltage for SIM card programming (not always present or used). It provides a higher voltage level during programming operations, although its presence and use may vary depending on the specific SIM card implementation.

I/O: Bidirectional data line for communication between the SIM card and the device. It helps with the exchange of commands, data, and responses between the SIM card and the device.

USB Pad/NC: It is optional. Some specific cards may have. It is not a standard component of a SIM card pinout. In a standard SIM card, it is NC(Not Connected).

Please note that the pinout can vary slightly depending on the specific type or version of the SIM card, and some pins may not be present or used in certain applications. Additionally, newer SIM card form factors, such as nano SIM or eSIM, may have different pinouts or may be embedded directly into the device, eliminating the need for physical pins.