A Buyer's Guide to Electronic Components

Electronic parts influence the flow of electrons or their associated magnetic fields to perform a certain electrical task. They come in countless forms and serve many distinct functions, but they can broadly be categorized as either active or passive based on how they interact with energy. Active components require an external power source to operate and actively control how signal or power flows through a circuit. Conversely, passive components do not require a power source and instead dissipate, resist, or store energy. To assist buyers in navigating the complexities of procuring such items outside of these basic definitions, this blog will take a look at a few foundational types of electronic components and provide some pointers for making the right purchasing decisions.

Interconnects

Electronic assemblies need basic infrastructure to transmit signals and power. Traditionally-passive interconnect assemblies perform this task, being made up of:

Cables or Wires: This is the medium through which current and data travel, providing a low-resistance path while resisting environmental stressors. There are many different features a cable or wire can hold, but its ampacity or power-carrying capacity is particularly important to keep in mind as you search for options. A smaller gauge number indicates a wire with a thicker cross-section capable of carrying higher current without overheating.
Connectors: Connectors are the mating interface between parts of a system, requiring a two-part system with a plug on the cable side and a receptacle mounted to the receiving component. The most standard variants include circular styles that are known for their strength, rectangular styles that suit space-constrained setups, and D-sub styles tailored for data or signal conveyance.
Backshells: A backshell is an accessory that screws onto the rear of a connector, providing strain relief for the attached wires while also shielding against electromagnetic interference (EMI) or radio frequency interference (RFI).

Notes for Selection

Seeing as these pieces are intended to function together, always verify that every piece of the assembly is cross-compatible and rated for the specific voltage and environmental conditions of your application.

Semiconductors

Semiconductors are the active switching and processing architecture in many electronic assemblies. Crafted from materials that possess electrical conductivity that falls between that of a conductor and an insulator—usually silicon—they can act as either a pathway or a barrier for current. Their main subtypes include:

Diodes: These two-terminal components allow current to flow in one direction while blocking it in the opposite direction, a function vital for converting alternating current (AC) to direct current (DC) and protecting circuits from reverse polarity.
Transistors: Using a small electrical signal at one of their terminals to control a much larger flow of current between their other two, transistors can create the binary on/off logic required for microprocessors or scale signals for power regulation and radio frequency amplification.
Integrated Circuits (ICs): Often referred to as microchips, ICs consolidate thousands or millions of resistors, capacitors, and transistors into a single small chip to perform complex tasks like data processing, signal amplification, and power management.

Notes for Selection

When sourcing semiconductors, be sure to keep in mind that standard diodes or transistors are typically interchangeable across different manufacturers, whereas ICs are frequently proprietary and curated to fit highly-specific printed circuit board (PCB) layouts.

Relays and Switches

While semiconductors excel at high-speed digital logic, they are vulnerable to EMI and high levels of heat. Passive electromechanical components like relays and switches step up in their stead with inherent resistance to EMI and an ability to handle the massive current inrush common with elements like motors, heaters, and heavy machinery.

A relay contains an electromagnetic coil energized by a low-power control signal, with the resulting magnetic field physically moving an arm that opens or closes contacts. As the control signal and the load current are on two independent circuits, a relay provides galvanic isolation that shields sensitive microprocessors from high-voltage loads, electrical noise, and potential power surges imposed by heavy machinery.

Meanwhile, switches may either manually or automatically interrupt or divert the flow of current, ranging from toggle and rocker switches like those used for lights to sophisticated rotary selectors and multi-position switches for control panels. No matter their form, they give operators a clear visual indication of their current state.

Notes for Selection

As you shop for either of these components, check if their Ampere rating is specified for resistive or inductive loads. Inductive loads create significant electrical arcing, so a relay or switch not rated for inductive inrush current will prematurely fail. Moreover, keep in mind that because these parts have moving elements, they have a finite mechanical and electrical lifespan that should be accounted for during long-term planning.

With switches in particular, check the number of poles and throws they hold to determine whether they can manage multiple independent power lines or simply act as a basic on-off trigger. Poles imply how many separate circuits the switch can control with a single actuation. On the other hand, the number of throws specifies the number of distinct positions available for each of those poles. For example, a single-pole, double-throw switch allows one input circuit to be toggled between two different output paths.

Resistors

Resistors are passive electronic components that provide a fixed, precalculated opposition to current measured in Ohms. Converting a portion of electrical energy into thermal energy, these items act as a deliberate bottleneck that protects downstream components from overcurrent. In most cases, they are either connected in series to drop voltage across a path or placed in parallel to divide the current between different branches of the system.

Notes for Selection

Your choice of resistor should mostly center on its ohmic value to present a proper level of resistance and a power rating that ensures it can properly dissipate heat. Selecting a resistor with an inadequate rating for its environment can burn it out or damage the surrounding assembly, so check its specifications against the maximum current and the thermal conditions of the intended hardware to make sure it will remain stable.

Buy Electronic Components Online through Electronics 3Sixty

No matter if you need simple wiring or a sophisticated semiconductor, securing electronics fit for the task requires you to have far more in-depth, specific technical knowledge than what was covered in this blog. Always be sure to fully look into the characteristics demanded of certain parts, the dimensions you are working with, and every other aspect of assembly to make sure you face no problems when building or repairing electronics. Along with this, you must only rely on reputable electronic parts suppliers to avoid the performance pitfalls of substandard components.

Once you are ready to make a purchase, you can confidently turn to Electronics 3Sixty, an ASAP Semiconductor-owned platform that presents a massive inventory of top-notch electronics. Our commitment to quality is not just a selling point, as we take great care to make sure every product is 100% traceable to an entity we trust and vetted for fit, form, and function. Aside from our extensive and easy-to-browse catalog of reliable items, customers benefit from technical expertise and a willingness to accommodate unique logistics to support every procurement endeavor. See how Electronics 3Sixty can serve you by exploring our website and connecting with our experts at your convenience!