The SC 91214A IC is a single chip with silicon gate body structure and CMOS integrated circuit. It consists of oscillator for a 3.58MHZ crystal or ceramic resonator. It performs the function related to pulse dialing (DP) or dual tone multi-frequency (DTMF) dialing. A standard 4 X4 matrix keyboard
can be used to support either DP or DTMF modes. 

The 2N3904 IC is a medium power NPN silicon bipolar transistor. It is a bipolar transistor that has feature of Pb-free device. It is designed for use in switching and linear applications.

It is a 1-channel 4-pin Transistor Output Photocoupler that contains an IRED optically coupled to a phototransistor. It is suitable for programmable controllers and facsimiles. It has a 10 to 20mA collector current. It has a 50mA forward current. It has a 6V reverse voltage. It has 200mW total power dissipation. It has applicable in Communications & Networking, Industrial.

The PC817 IC ks build with an IRED which is optically paired to a phototransistor. It consists of a 4-pin DIP package and there is high isolation of voltage amongst the input and the output. The collector-emitter voltage is high and it is RoHS directive compliant.

BT 136 SMD IC is the surface-mountable plastic package intended for use in general-purpose bidirectional switching and phase control applications. This sensitive gate "series E" triac is intended to be interfaced directly to microcontrollers, logic integrated circuits, and other low power gate trigger circuits.
 

This electronic component is designed to absorb and remove heat from an object like computers, mobile phones, DVD players, and fridges. It removes heat from objects or circuits, sends them to the surrounding medium.IC heat sink is an electronic component that has a material range like aluminum, stainless steel, and many more. This IC heat sink has surface treatment through zinc plating. This IC heat sink can be used in different preferred industries like in communication, medical, photo industry, and many more.

The LM7812 is a three terminal regulators available in TO-3 package. It can be used as fixed voltage regulators, obtain adjustable voltage and current. It has several fixed voltage output that makes it useful for wide range of application. It has features like current limiting, safe area protection and thermal shutdown. It can be used as DIY protection for devices having specific voltage sensitivity 

The NE555P IC is aTimer Module IC helps in  precision timing circuit which capable of producing accurate time delays or oscillation. It can be applicable in various fields like :- fingerprint biometrics, iris biometrics, RFID reader and so on.

The ULN2003 is Darlington transistor array with a high voltage and high current. For switching the loads connected to the output it has seven NPN Darlington connected transistors with common clamp diodes. The input is compatible with various types of logic. Its application are relay drivers, hammer drivers, lamp drivers, logic buffers and many more. 

The LM358 is a low power 8-pin integrated circuit dual operational amplifier used in detector circuits. It can be used as transducer amplifier, DC gain block etc. This ic eliminates the need for a dual supplies. It is compatible with all form of logic. For battery operation the power drain is suitable.

The LM324 has four independent operational amplifiers with 14 pins. It can operate wide range of voltage from a single power supply. It is generally used in the line following robot, applicable for oscillators, comparators, rectifiers, amplifiers etc. Its application are transducer amplifiers, DC gain blocks and conventional Op Amp circuit

The 3144T IC is an integrated Hall Effect latched sensor with CMOS technology. It integrates a voltage regulator, Hall sensor with dynamic offset cancellation system, Schmitt trigger and an open drain output driver, all in a single and small package. It can be applicable for various fields like: - Automotive, Speed detection, Solid state switch, Security alarm devices, Textiles control systems and many more.