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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478 views

drilling pin header holes when exact drill size not locally available

I checked all of the hardware stores in my area and I can buy 1/32 (~ 0.79mm) and 3/64 inch (~ 1.2mm) drill bits. No source in my area carries bits which are between those two sizes which would then ...
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THT decopling capacitor spacing from the TQFP uC's power pin

simple question - how close can the uC's power pin (TQFP pad) and a ceramic cap's PTH pin can get so the PCB fabrication process or later exploitation would not go wrong ? Some ballpark figures for ...
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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,
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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 ...
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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 ...
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336 views

Unsolder large TO-220 or TO-247 packages

I'm aware this question may be construed as asking for advice but I'm going to venture to ask anyways. Does anyone have a good method for removing larger TO‑220 or TO‑247 packages? I ...
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1answer
107 views

is it possible to replace the metal on the bottom of a PCB?

I attempted to drill three holes slightly bigger on a circuit board. As soon as I touched the board with the drill, the metal that you solder contacts to separated from the board. I want to know if ...
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1answer
589 views

Shrinking drill hole size in Eagle

The last time I did a successful PCB, the drill hole size relative to the component pad size is rather huge to the point where when I entered the soldering stage, the component wires were not ...
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689 views

PCB Through Hole Pattern for Non-Standard Wide DIP-6

Should I use a 2.75mm pin pitch for this Fairchild MOC3023TVM, or should I stick with 2.54mm(100mil) spacing? Notice the alignment on the dimensions from the datasheet in the figure below (2.75mm = ...
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201 views

Connectors in high volume manufacturing?

How are connectors such as USB handled in high volume manufacture? Would the panelized board leave room to place these connectors or would the panel be cut apart and the connectors added later. Is ...
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1k views

Altium - How to Convey Pin-In-Paste Technology in Design

I am working on the first board design I've done with a connector that requires pin-in-paste (aka. "paste-in-hole") soldering. We are trying to expedite the manufacturing process so we are leaning ...
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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 ...
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1k views

Desoldering a TO-220 MOSFET from a plated through-hole board with SMD complications

I'm planning on replacing a TO-220F package MOSFET on a through-hole circuit board that also has SMD components on it. In this case, an SMD capacitor is connected to the source gate of the MOSFET by ...
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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 ...
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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 ...
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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 ...
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1answer
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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?
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244 views

Pastemask. Manufacturing PCBs

after finishing some designs, it is time to manufacture and assemble them. For making these designs I have to create all padstacks, footprints, etc from scratch, so I took PCB Editor examples as ...
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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 ...
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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 ...
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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 ...
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240 views

Drill hole size suggestion for this pass-through socket

I'm considering using this pass-through socket for a project. Since I'm newer at this, I was wondering what size through-hole would be best? This socket will solder in, so I understand that I can go ...
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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 ...
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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....
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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 ...
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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 ...
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4k views

Eagle Cad: change default drill size list

Eagle Cad specifies certain drill and hole sizes, for example, used for VIAs, when routing. I know that I can enter the drill size in the combo box and it will be remembered. But all the other "...
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1answer
1k views

Maximum protusion length for through-hole component pins

I'm working on a PCB that has through-hole components on both sides of the board. The "top" side of the board is mounted flush to a Delrin plastic block (the only top-side component is a gas sensor ...
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3answers
2k views

Tips for desoldering difficult to desolder mini transformers

I have to replace a couple of small transformers without destroying the PCB or the transformers. Unfortunately my phone camera is unusable so I need to describe them and what makes the situation so ...
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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 ...
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654 views

Can the metal tab at top of a TO-220 package be cut off?

I am using a TIP120 Darlington transistor in a through-hole (specifically TO-220) package, in a very simple application which does not generate much heat. I remember reading that the metal tab at the ...
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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 ...
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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, ...
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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 ...
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857 views

High precision soldering of through hole components

I have a through hole component with many leads spaced closely together, see picture: I'm looking to unsolder it from the PCB and then solder it back again. Unfortunately, the leads are spaced so ...
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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. ...
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1answer
157 views

Plated hole without circles on layers

I am a beginner on Eagle. I want make a plated hole on PCB but no any pad on top or bottom layers. Or, a plated hole on PCB but bottom and top layers are electrically isolated. Another variation is ...
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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 ...
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3k views

Do high power through hole resistors need a heat sink

I'm using the following resistor: click. To be precise, the MCKNP05SJ050KAA9 found here. From what I've been able to determine, my device is the ...
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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 ...
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506 views

Can someone verify the hole diameter is correct?

I'm looking at this current sensor (datasheet) I'm a little confused at this notation for hole size. Pin 5 and 6 have a diameter of 0.6mm while pin 1, 2, 3, 4 have a diameter of 0.25mm ? Is that ...
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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 ...
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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.
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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 ...
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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 ...
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7answers
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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 ...
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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 ...
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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 ...
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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 ...
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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? ...