Through-Hole vs SMD for Prototyping: Which Should You Use?

The Question Every Maker Asks

You are sitting with a breadboard and a pile of components. The circuit works. The next question is always the same: do I build the prototype with through-hole parts on perfboard, or go straight to SMD on a custom PCB? The answer depends on what you are building, how many you need, and how comfortable you are with a soldering iron.

There is no universal right answer. But there are clear rules for when each approach wins.

Through-Hole: The Old Reliable

Through-hole components have long leads that go through holes in the board and are soldered on the opposite side. The leads provide mechanical strength that SMD parts cannot match.

When Through-Hole Wins

One-off prototypes: If you are building one board to test a concept, through-hole on perfboard is faster and cheaper than designing a PCB. You can make changes with a soldering iron and solder wick.

High-vibration environments: The mechanical strength of through-hole joints beats SMD for anything that gets rattled around. Automotive, industrial, and aerospace applications still use through-hole for connectors, large capacitors, and terminal blocks.

Learning and education: Through-hole is easier to see, probe, and debug. A student seeing a resistor colour code on the component itself makes the connection between the schematic symbol and the physical part. SMD hides everything.

High-power circuits: Resistors dissipating more than 0.5 W, large electrolytic capacitors, and power transistors all need through-hole for heat dissipation and mechanical support. A through-hole TO-220 MOSFET on a heatsink handles 50 W. A small SMD MOSFET (SOT-23) struggles above 5 W without a thermal via and copper pour.

Through-Hole Tradeoffs

Through-hole takes up more board space. A 0.25 W resistor in through-hole needs as much room as ten 0603 SMD resistors. Boards with many through-hole parts cannot be made compact. Also, drilling holes costs money—PCB fabs charge more for boards with many plated through-holes.

SMD: The Modern Standard

Surface-mount components sit on top of the board and are soldered directly to pads. No holes, no lead trimming, no flipping the board.

When SMD Wins

Multi-layer and complex boards: Modern microcontrollers come in QFP, QFN, and BGA packages that only exist in SMD. A STM32F4 in a 100-pin LQFP package has a 0.5 mm pitch—you cannot get that in through-hole. If your design uses modern ICs, SMD is not optional.

High-frequency circuits: SMD components have shorter lead lengths, which means lower parasitic inductance and capacitance. A through-hole resistor has about 10 nH of lead inductance. An 0603 SMD resistor has about 1 nH. Above 100 MHz, that difference determines whether the circuit works.

Production runs of 10+ boards: Once you order a PCB from JLCPCB or PCBWay, SMD assembly is cheaper per board than through-hole because pick-and-place machines are faster than human hands. For runs over 50 units, SMD is always the right choice.

Thermal performance: SMD parts use the PCB copper pour as a heatsink. An SMD MOSFET with a large copper area on the PCB can handle more current than its through-hole equivalent in the same board area.

SMD Tradeoffs

SMD requires a PCB. You cannot breadboard an 0603 resistor. For a single prototype, the PCB order cost (R200–R500 from Chinese fabs, R800+ from local) and 7–14 day shipping time are real barriers.

Hand soldering SMD is more difficult. With practice, 0805 and SOIC packages are straightforward. QFN and BGA need hot air or a reflow oven. A temperature-controlled iron, flux, and good tweezers are the minimum toolkit.

The Hybrid Approach (Most Common)

Most real-world boards mix both technologies. A typical design uses SMD for the main components—microcontroller, passives, voltage regulators—and through-hole for connectors, switches, large capacitors, and anything that takes mechanical stress.

This gives you the density and performance of SMD where it counts, and the mechanical robustness of through-hole where it matters.

Quick Decision Guide

One-off prototype, simple circuit → through-hole on perfboard

One-off prototype, uses modern ICs → SMD on a custom PCB

Learning electronics → through-hole first, SMD second

Production run of 10+ boards → SMD with assembly

High-vibration use → through-hole for connectors and big parts

High-frequency circuit (>100 MHz) → SMD, no exceptions

High-power (5 W+) → through-hole with heatsinks

Battery-powered device → SMD for size and weight

Minimum Toolkit for Each Approach

Through-Hole Toolkit

A basic soldering iron (R200–R500), solder (0.7–1.0 mm diameter), side cutters, needle-nose pliers, and a perfboard. A desoldering pump is nice to have but not essential for the first few boards.

SMD Toolkit

A temperature-controlled iron (R350–R1,800), fine-gauge solder (0.5 mm), liquid flux, curved tweezers (R50), and magnification. A hot air station (R400–R800) expands what you can do. A reflow oven is optional until you are doing QFN or BGA regularly.

Finding Components in South Africa

TRX Electronics in Pretoria stocks both through-hole and SMD components across the full range. Whether you need 0805 resistors for an SMD build or TO-220 MOSFETs for a through-hole power supply, we carry the parts. Contact our engineering team at +27 (0)12 997-0504 or visit trxe.com.

Frequently Asked Questions

Can I use both through-hole and SMD on the same board?

Yes, and most boards do. SMD components go on one side (or both), through-hole parts go through the board. Just make sure your PCB design accounts for the different footprint sizes and hole diameters.

Is SMD harder to solder by hand?

Small packages like 0402 and QFN are harder. Larger packages like 0805, SOIC, and even TQFP are straightforward with practice and the right tools. Start with 0805 passives and SOIC ICs, then move to smaller packages.

Which is cheaper for a single prototype?

Through-hole on perfboard is cheaper for one board—no PCB fab cost, just components and wire. For the second and third revision, through-hole on stripboard (Veroboard) is also cheaper. Once you need three or more copies or a complex board, SMD on a custom PCB becomes cheaper per board.

Can I prototype SMD circuits without a PCB?

SMD to DIP adapter boards let you solder SMD parts onto a small board with through-hole pins that plug into a breadboard. They are cheap (R5–R20 each) and useful for prototyping a specific IC before committing to a PCB.