Questions tagged [through-hole]

Through-hole technology refers to the mounting scheme used for electronic components that involves the use of leads on the components that are inserted into holes drilled in printed circuit boards (PCB) and soldered to pads on the opposite side.

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31
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2answers
11k views

How can I reverse engineer a simple through-hole board?

How can I reverse engineer a simple through-hole board? Trying to do it by eye gets confusing because it's easy to lose track of component orientation and location while flipping the board over. Maybe ...
30
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5answers
71k views

What pad hole (drill) size is appropriate for a given through-hole lead diameter?

I am making some new through-hole parts in Eagle for components that are not already in the various libraries. I've realized that the drill size needs to be a little larger than the lead diameter, but ...
22
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1answer
9k views

Round female pin header vs square female pin header

What are the main differences (except for the obvious, one is round one is square) between the round pin headers and the square ones? Or differently asked: Why would someone choose round pin headers ...
21
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4answers
2k views

Do engineers still design for volume using discrete through-hole bipolar transistors?

As a hobbyist who likes plugging BJTs and discrete components into solderless breadboard for entertainment and education, I recognise that people like me are an insufficient market to make it ...
20
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3answers
2k views

What are the 'knuckles' on through-hole LEDs and photodiodes for?

I am using an IR LED and a photo diode, and I have designed the PCB according to the specifications that I found on the datasheet - i.e. hole sizes for the pins being 0.6 mm. However, on these ...
17
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5answers
16k views

Plated Through Hole at home?

Is it possible to make PTH (Plated Thorugh Hole) at home? Can somebody explain the procedure?
12
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6answers
2k views

Tips for optimizing through-hole soldering

I make and sell low voltage, mostly digital, retrocomputing expansion boards as a hobby/hustle. I use all through-hole components partly because of the retro aesthetic and partly because I find ...
11
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3answers
10k views

Is there any pattern or standard to through-hole resistor sizes?

I've long been under the impression that a quarter-watt resistor has a standard package, and a half-watt resistor has a standard package, etc. But I've recently gotten through-hole resistors which are ...
10
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4answers
6k views

Holding components without bending leads when soldering upside down?

I am gaining experience in soldering components onto PCBs. I'm working through some one sided through hole PCBs and one thing that I'm having trouble with is holding components once I flip the board. ...
10
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2answers
3k views

How do surface mount components withstand heat of reflow while through hole components can not?

I have read some online tutorials about soldering through hole components which say that transistors and ICs are delicate components and can be easily damaged by heat. So they recommend to keep the ...
10
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1answer
2k views

Which is better - components on both sides or components on one side of the PCB?

I am working on a PCB design. 50k PCBs will be produced. SMD components: 100 Through-hole components: 25 I need to minimize PCB size. There are no high-speed signals or sensitive signals in the ...
10
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3answers
27k views

How can I make a plated-through hole in Eagle?

I have mounting holes (0.125 in) at the corner of my PCB project in Eagle, made with the standard "hole" tool. However these are not electrically connected to anything. There doesn't appear to be a ...
9
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8answers
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Assembly of PCBs containing a mix of SMT and thru-hole parts?

I have a batch of beta PCBs which we have to assemble in our lab. We have an APS manual pick-and-place machine and a tabletop reflow oven so I thought assembly tomorrow would be easy and straight ...
9
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3answers
3k views

What's up with these plated through-holes / vias?

We purchased a number of stainless steel kiosk keyboards from a Chinese manufacturer a while back and have been seeing extraordinary failure rates (around 30%). Groups of keys just stop working. I'...
8
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5answers
3k views

Hack for fitting 0.04“ leads in to a 0.025” hole on PCB

This might be a ridiculous question to ask - but I have made a mistake in a new library I created in Eagle for a component. The drill diameter of the plated holes for the component leads should have ...
8
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2answers
3k views

How are through-hole boards mass-produced?

I'm familiar with the manufacturing process of surface mount boards. Chips come on reels (very high volume smaller parts), trays, or tubes. They are loaded into pick-n-place machines. The PCB, with ...
8
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1answer
27k views

Advantage or disadvantages of SMD over Through hole design in high frequencies?

I know this is an elementary question. I know that SMD design has the advantage of smaller board size but I dont know which design works better in higher frequencies.
7
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6answers
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Noisy signals with 2-layer PCB - What's wrong with my design?

For my master's thesis in computer science, I need to read out a TCD1304AP linear CCD sensor. A STM32 microcontroller with the circuit laid out on a breadboard gets the job done, but in order to make ...
7
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2answers
1k views

What is this component thingy?

I can’t find or describe what this component looks like. Out of curiosity, what is it? I found it on a PCB for a car alarm, but it has no silk-screen label... It has a grub screw that is adjustable. ...
7
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3answers
4k views

Flush Mounted Threaded Through Hole on PCB

I am looking for the name of the component in this picture: Does anyone know off the top of their heads? I'm working on designing a product that requires 2-56 threaded holes in a PCB, and I need ...
6
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1answer
937 views

THT: What is a squared annular “ring”? [duplicate]

At least in KiCad, the footprints of through-hole pin headers have one squared annular “ring”, the other ones are round: What does the square indicate? (Also I’m wondering if there is perhaps a ...
6
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3answers
2k views

Through board connector

I'm looking for a connector. Ideally it would be a one pin connector mounted on the back side of a board and the pin would come through the board into connector. Here's an illustration: Does such a ...
6
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1answer
2k views

Edge-mounted vias… or how is this called? And can PCBs services manufacture it?

As you can see, the through-holes (vias) are at the border of the inner cutout. (rendering is wrong of course, as vias are not cut) I imagine a manufacturer first prints the board and then cuts it, ...
6
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2answers
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How do I design a through-hole pad in Altium Designer?

I want to define a custom component (TO92 temperature sensor) in Altium Designer with through-hole pads (0.7mm hole diameter, 1.27mm pitch). What is the right way to do this? I I created the ...
5
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5answers
1k views

Tiny parallel eeprom

Is there such a thing as a low pin-count eeprom IC that can be used to replace logic circuits with just a couple of inputs and outputs? I'm thinking of DIP-16 or smaller, but it needs to be parallel. ...
5
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1answer
1k views

Mounting through hole package on busbar

Through-hole components are not designed to be busbar mounted. But I have the need to use "laminated" busbar because of some factors (among others): High current Small parasitic inductance ...
4
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4answers
1k views

Is Saving Through-Hole Components Viable? [closed]

I recently got my hands on some old electronics. After getting some to work and failing to get others to work, I decided to simply desolder some of the through-hole components to possibly use in ...
4
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2answers
1k views

What is a 'piano THT' footprint for?

What is the 'piano' THT footprint for? Are these used for signal probing? See the second layout, as different from the first (KiCad ScreenGrabs).
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3answers
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Drill files from Kicad for PTH and NPTH

I have a board in Kicad that uses a mixture of plated and non-plated through holes. It generates two drill files for these. However, manufacturers seem to expect only a single file. If they don't ...
4
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1answer
1k views

Hole Drill Sizes >1mm in Eagle?

I am currently trying to build a package for a through hole potentiometer in Eagle Cad and I wanted to incorporate holes in my PCB for the metal tabs on the side of the pot. I determined that these ...
4
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1answer
7k views

Through-hole footprints: pad size from technical drawings

I'm creating some footprints for through-hole components in KiCad, and I've got some issues determining the correct pad dimensions from manufacturer's technical drawings. As an example, here's the ...
3
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4answers
2k views

Can you put a through-hole part behind an SMT part?

I'm wondering if it's possible to place a through-hole connection on the opposite side of an SMT microcontroller. I have a small connector with a solder pin (for the shield) on one side of the board, ...
3
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7answers
5k views

2 Layer Through Hole PCB

I am designing my very first PCB for a robotics project I am working on. The project will be using through hole components. I was not able to get all the traces to work on 1 layer, so I added a ...
3
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3answers
1k views

how to place decoupling capacitors on a four-layer board for through-hole components?

From what I've read online, for SMT components there should be traces from VCC/GND pins to the capacitor and then vias to the ground and power planes. The situation is a bit different for through-...
3
votes
3answers
454 views

Removing PCB from complex pattern of soldered-in thru-hole posts?

I have a PCB mounted to a chassis with 16 feedthrus, the feedthrus posts are soldered to plated thru-holes in the PCB. I would like to remove the PCB from the chassis, the problem is that I am unable ...
3
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1answer
549 views

What is this IC “D4164D”

I found this component lying about, anybody have any idea what it is? I found a few people selling them on ebay but no description. The label says, "NEC 208 D4164D" Thanks,
3
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2answers
1k views

What hole size for test probe to get a snug fit?

I’m designing a bed of nails test jig. I want my test probes to fit snugly in the circuit board, but want to allow for variation in the through hole plating of the hole. In Altium, when you specify ...
3
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4answers
2k views

Esp8266 (esp-03) breakout

Recently, Hackaday is talking a lot about the esp8266, a wifi to serial chip. I want to use the esp-03, a breakout with half-hole connectors that has 2mm pitch. Is there a breakout board that can turn ...
3
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3answers
2k views

How to create custom through hole pad shapes in Altium Designer?

I'm trying to create a footprint for the ACS770 current sensor in Altium Designer (17.1), which has a quitte irregular shaped pad: ('round' pad shape with slot hole, and then a small cutoff in the ...
3
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2answers
633 views

PCB has strange looking pads, how do I solder them without impacting nearby surface mount components?

I've recently brought the px4fmu and px4ui boards. The px4io requires me to solder a power socket and headers onto it. However there are surface mount components very close to the holes/pads. Also ...
3
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2answers
673 views

Eagle Drill vs. Diameter Parameters when making Through Hole Parts

I am working on making footprints in Eagle for a through-hole connector I want to use. I am running into some issues as I try to determine the appropriate diameter and drill size I need for the ...
3
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1answer
94 views

Are PLCC Chips/Sockets always the same pitch?

I'm hunting down a socket for a PLCC-84 chip and none of them mention pitch spacing. Is that because PLCC is always the same spacing between pins?
3
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2answers
2k views

Passing copper traces between two THT pins

I've been working on a small project as an extra activity for a basic digital electronics course I was taking, in which I had to design a TTL-logic based PCB, and etch it. I've been using Ultiboard 11 ...
3
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1answer
2k views

Surface Mount vs Through Hole Aluminium Electrolytic Capacitors?

What are the differences between SMD and TH Aluminium Electrolytic Capacitors? Why are TH variants available with such greater lifetimes? (For example, Digi-key has SMD aluminium caps up to 10k hours, ...
2
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2answers
2k views

Purpose of oval/oblong PCB through hole pads

What is the actual purpose of using the oval/oblong pads that are commonly used for ICs? Everywhere I read the answer is the possibility to allow a track between the pins, but as long as the pad ...
2
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2answers
211 views

What does “Pins are on 0.17” centers" mean?

I'm looking at some switches (here) and the description reads: Small PC mounting slide switch features SPDT contacts and white positive action slide lever. Size about 0.56"L x 0.25"W x 0.34"H (...
2
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3answers
2k views

Using a mixed technology, SMD and THT components in one PCB

I want change design from Through-hole technology to SMD design. Some components have no SMD version, for example some transistors in TO-92 package, and Power Mosfets, which available in DPAK SMD ...
2
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1answer
1k views

Solder through-hole or surface-mount components first?

I am new to surface mount soldering. On a board with both SMT and through-hole parts (header pins), which parts should I solder on first? I imagine the technique I use for SMT soldering is important....
2
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2answers
356 views

Recommended pad size for desoldering?

I am designing a PCB that has will hold an Arduino Micro, as well as other components. One of the electrical engineer mentors that are overseeing the board development has told me to increase the ...
2
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3answers
2k views

Breadboard/veroboard and SMT

By now, through-hole components have almost completely disappeared from consumer devices and also professional PCBs. But what is the alternative to build breadboard-veroboard for SMT technology? ...