Through Hole PCB Assembly

Through Hole PCB Assembly

Through-hole PCB assembly is a manufacturing process that involves soldering component leads or pins into holes in a printed circuit board (PCB). This method was traditionally used in the production of PCBs and is still in use today, though surface mount technology has largely replaced it in mass production (SMT).


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Through-hole assembly is a method of making electronic circuits in which elements are installed through leads. It is the process of inserting leads into drilled holes and soldering components to the board with wave soldering or manual soldering. In through-hole PCB assembly, the holes in the PCB are drilled or punched to precise dimensions, and the component leads are inserted through the holes and soldered to the PCB to create a secure electrical connection. This can be done either manually or with the help of automated machinery.

We can provide to...

  • Turn times as short as 24 hours
  • 1 to 100,000 units
  • Class II Inspection standard and Class III Inspection available
  • 100% on-time guarantee
  • DFM support
  • Lead free (RoHS) options
  • SMT and thru-hole capabilities
  • All SMT machine placed
  • AOI (Automated Optical Inspection)
  • Lead-free RoHS Certification and ITAR compliance screen available
  • Program Design
  • Assembly Capacity
  • SMT Capacity
  • Equipment Exhibition

From element procurement to functional testing and package completion, we offer a one-stop shop for all types of PCBs.


Quick payment

Flexible payment options


On-Demand Manufacturing

No MOQ or MPQ limited. Prototype or mass production order acceptable.


Inspection Of Quality

90% of the technical staff have more than 10 years of industry experience

Assembly Capacity

Turn-key Purchase from authorized suppliers, distributors
Consigned Accept parts in reels, cut tapes, tubes & pallets and bulk.
Stencils Offer Laser-cut stainless steel stencil.
Solder type Offer both lead&lead-freeassembly services.
Board type Rigid board, flex board&rigid-flex board.
PCB or Panel Size Min board size of 10*10mm
PCB or Panel Size Max board size of 330*530.
Assemble type The customer provides some components
Board shape There is no limit to shape
Prototype MOQ as low to 5units in 1-2 days delivery
Low volume Offer 3-4 days quick turn time service for low volume.
High volumn Offer accurate delivery to catch your deadline.

SMT Capacity

Single and double sided SMT/PTH Yes
Large parts on both sides Yes
BGA on both sides Yes
Smallest Chips size 201
Min BGA 0.008 in. (0.2mm) pitch
Micro BGA pitch ball count greater than 1000
Min Leaded parts pitch 0.008 in. (0.2 mm)
Max Parts size 2.2 in. x 2.2 in. x 0.6 in.
Odd form parts: Yes,Assembly by hands
LED Yes,Assembly by hands
Wave soldering Yes
Max PCB size 14.5 in. x 19.5 in.
Min PCB Thickness 0.02
Fiducial Marks Preferred but not required
PCB Finish: Electrolytic gold
PCB Finish: Electroless gold
PCB Finish: Electroless silver
Ball counts ball count greater than 1000
Resistor Yes,Assembly by hands
Capacitor networks Yes,Assembly by hands
Electrolytic capacitors Yes,Assembly by hands
Variable resistors、capacitors (pots) Yes,Assembly by hands
Sockets Yes,Assembly by hands
PCB Shape Any
Panelized PCB Tab routed
Panelized PCB Breakaway tabs
Panelized PCB V-Scored
Panelized PCB Routed+ V scored
Inspection X-ray analysis
Inspection Microscope to 20X
Rework BGA removal and replacement station
PCB Finish: Immersion gold
PCB Finish: Immersion tin
PCB Finish: OSP

Testing Procedures

Through-hole PCB assembly has several advantages, including:

  • High dependability: Because the components are securely anchored to the PCB, the assembly is less likely to fail due to mechanical stress or vibration.
  • Repairability: If a component fails, through-hole PCB assembly makes it relatively simple to remove and replace it.
  • High current carrying capacity: Through-hole PCB assembly allows for greater current capacity than surface mount components due to larger hole size and longer lead length.

However, when compared to surface mount technology, through-hole PCB assembly has some drawbacks, including:

Price increase: Through-hole PCB assembly is generally more labor-intensive and requires more expensive equipment than surface mount assembly, making it more expensive.
Larger size: Through-hole assembly components and PCBs are typically larger than surface mount components, which can be an issue for compact designs.
Reduced density: In general, through-hole PCB assembly is less dense than surface mount assembly, which can be an issue for high-density designs.

Despite these drawbacks, through-hole PCB assembly is still used in a wide range of applications where the benefits outweigh the costs, such as military, aerospace, and medical equipment.

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Frequently asked questions

What is through-hole PCB assembly?

What are the advantages of through-hole PCB assembly?

What are the disadvantages of through-hole PCB assembly?

What are the steps in through-hole PCB assembly?

What tools and equipment are used in through-hole PCB assembly?

How can I ensure the quality of my through-hole PCB assembly?

Michaela ★★★★★

The assembled PCBs that were delivered worked flawlessly. The component placement is excellent. Mis wang, the WINOW engineer in charge of our project, and I hit it off right away. She asked pertinent questions to ensure that the project was properly completed. We had a very nice, short, and to-the-point conversation.

Herbert ★★★★★

This board is required to charge my robotic platform's lipo batteries (rover). First-time order with excellent communication throughout the ordering process, manufacturing progress, and tracking up to delivery. Very good price, especially for the first order with a credit for a discount.

Al Lemke ★★★★★

The boards arrived yesterday, and assembly has begun. Excellent solder wetting, clean line definition, and drill holes that are precisely in the center of the via lands.
Please convey my gratitude to everyone who created such wonderful boards.

Rated 9.0 Out Of 10 Based On 100,000+Reviews, Please feel free to inquire

Why Choose Us?

Since 2018, WINOW has offered good-quality PCBs with excellent turnaround times and customer satisfaction. We are one of the biggest and most skilled board manufacturers in China.

  • icon_hock Prototype orders are processed within 24 hours.
  • icon_hock On average, PCB prototypes and small-batch manufacturing take 5-7 working days.
  • icon_hock The lead time for small batch production and some PCB prototypes is 48 hours.

Quick payment

Flexible payment options


On-Demand Manufacturing

No MOQ or MPQ limited. Prototype or mass production order acceptable.


Inspection Of Quality

90% of the technical staff has more than ten years of experience in the industry.

Technical Strength

IPCB Assembly can be adjusted at any time to meet customer ICT, veneer, aging, and ATE requirements.

Quick Delivery and Comprehensive Support