4824-3000-CP vs 540-88-084-17-400
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| Category | Sockets for ICs, Transistors | Sockets for ICs, Transistors |
| Manufacturer | 3M | Preci-Dip |
| Description | CONN IC DIP SOCKET 24POS TIN | CONN SOCKET PLCC 84POS TIN |
| Package | - | - |
| Series | 4800 | 540 |
| Type | DIP, 0.3" (7.62mm) Row Spacing | PLCC |
| Features | Open Frame | Closed Frame |
| Operating Temperature | -25°C ~ 85°C | - |
| Mounting Type | Through Hole | Surface Mount |
| Termination | Solder | Solder |
| Housing Material | Polyester, Glass Filled | Polyphenylene Sulfide (PPS) |
| Pitch - Mating | 0.100" (2.54mm) | 0.050" (1.27mm) |
| Contact Finish - Mating | Tin | Tin |
| Contact Finish - Post | Tin | Tin |
| Contact Finish Thickness - Mating | 35µin (0.90µm) | - |
| Number of Positions or Pins (Grid) | 24 (2 x 12) | 84 (4 x 21) |
| Contact Material - Mating | Phosphor Bronze | Phosphor Bronze |
| Pitch - Post | 0.100" (2.54mm) | 0.100" (2.54mm) |
| Contact Finish Thickness - Post | 35µin (0.90µm) | - |
| Contact Material - Post | Phosphor Bronze | Phosphor Bronze |
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1. What is an IC socket?
An IC socket, or integrated circuit socket, is an electronic component used to be installed on a circuit board. Its main function is to insert and fix an integrated circuit (IC) chip. An IC socket is set in multiple cavities through multiple electrical contacts, so that the IC chip can be directly plugged in and out without the need to use a soldering iron for desoldering, thereby improving the flexibility of chip assembly and the convenience of repair and replacement.
Specifications and types of IC sockets
The specifications of IC sockets are diverse, and the common ones are 8, 16, 18, 20 pins and other specifications. In addition, the hole pitch of the IC socket is 2.54mm and 1.778mm, the shape is a round hole, and the arrangement is single row and double row. The number of pins ranges from 1 to 50P, and the exposed length of the PIN pin also has a variety of options, such as 7.43mm, 10.0mm, 12.2mm, 13.4mm and 17.8mm. -
2. Does IC contain transistors?
IC (integrated circuit) does contain transistors. An integrated circuit is an electronic component that combines several microelectronic components such as transistors, diodes, resistors, capacitors, etc. on a tiny semiconductor chip. These components are usually manufactured on silicon wafers through semiconductor processes and can perform complex functions.
The role of transistors in ICs
Transistors play a key role in ICs. They are one of the basic building blocks of ICs. Transistors can amplify current or voltage signals and are the core components for realizing the functions of electronic circuits. By integrating a large number of transistors, resistors, capacitors and other components together, complex electronic circuits can be built to realize various electronic functions. -
3. Which IC package can be inserted into the socket?
DIP package (Dual Inline-pin Package) is an IC package that can be inserted into the socket. DIP package adopts dual inline form, and its number of pins generally does not exceed 100, which is suitable for small and medium-scale integrated circuits. This packaged IC has two rows of pins and needs to be inserted into a chip socket with a DIP structure, or it can be directly inserted into a circuit board with the same number of solder holes and geometric arrangement for soldering.
What is the use of transistors?
Transistors generally refer to all single components based on semiconductor materials. Transistors have multiple functions such as detection, rectification, amplification, switching, voltage regulation, signal modulation, etc. Transistors can be used for a variety of digital and analog functions.
On December 16, 1947, William Shockley, John Bardeen and Walter Brattain successfully created the first transistor at Bell Labs.
Transistors are one of the most critical components of modern electrical appliances. The reason why transistors can be used on a large scale is that they can be mass-produced at a very low unit cost.
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4. What are PNP and NPN transistors?
PNP and NPN transistors are two basic types of transistors, which have significant differences in structure and current flow direction.
Definition and structure
NPN transistor: It is composed of two N-type semiconductor regions sandwiching a P-type semiconductor region, forming three main regions of emitter (E), base (B) and collector (C). This structure makes the NPN transistor behave in the circuit similar to two PN junction diodes connected back to back.
PNP transistor: It is composed of an N-type semiconductor material doped between two P-type semiconductor materials, and also has three regions of emitter, base and collector, but the current flow direction and carrier type are opposite to those of NPN.
Working Principle
NPN transistor: When a forward bias voltage is applied between the emitter and the base, the free electrons in the emitter can cross the PN junction into the base and recombine with the holes in the base to generate a base current. A reverse bias voltage is applied between the collector and the base to prevent further flow of current. When a small input signal is applied to the base, this signal changes the voltage between the base and the emitter, thereby affecting the injection of free electrons in the emitter and forming a collector current. Since the collector current is an amplification of the base current, the NPN transistor has an amplification effect.
PNP transistor: The working principle is similar to that of the NPN type, but the current flow direction and carrier type are opposite. Positive charge flows from the emitter of the P-type semiconductor to the base, a part of which is captured by the base electrons of the N-type semiconductor and becomes the base current, and most of the rest becomes the collector current.
