PCB - Single Sided

Description

Single-sided printed circuit boards (SPCs) are the most basic PCB type, with a copper pattern formed on only one side of the board. Components are primarily mounted on one side, and electrical connections are made via the pattern on the single copper side. Single-sided PCBs are simple and cost-effective, making them the basic type of PCB optimized for low-density, simple circuits.

Specifications

Base Material
Key factors determining the mechanical strength, electrical properties, and price of single-sided PCBs.

FR-4
• Glass fiber-based epoxy resin
• Excellent strength, heat resistance, and moisture resistance
• Suitable for industrial and high-reliability products

CEM-1 / CEM-3(FR-1 / XPC)
• Paper or composite-based
• Effective for cost savings
• Primarily used in consumer goods and simple circuits

Primarily used in consumer goods and simple circuites
Selection criteria : Prioritizing durability and reliability → FR-4 Prioritizing cost savings → CEM series

Board Thickness
• Typical range: 0.4 mm to 3.2 mm
• Affects mechanical rigidity, vibration resistance, and mounting method

Typical application examples • Small, lightweight products: 0.8 to 1.2 mm
• Products requiring mechanical rigidity: 1.6 mm or more

Copper Weight
• 1 oz ~ 2 oz/ft² (minimum standard)
• Directly related to current capacity and heat dissipation characteristics

Selection criteria
• Low-current circuits → 1 oz
• Power/high-current circuits → 2 oz or more

Lines & Spaces
Determines circuit density and manufacturing difficulty

• Standard low-cost specification: 200μm
• Minimum possible specification: 100μm

Single-sided PCBs have a single wiring layer, so smaller lines/spacing increases design freedom, but also increases cost.

Layer Count
• 1 Layer
Since wiring is only possible on one side, it is not suitable for complex circuits, but is suitable for simple control and power circuits.

Surface Finish
This process affects solderability, storability, and cost.

LF HASL(Lead-Free HASL)
• Excellent solderability for the price
• Most widely used

OSP
• Low cost and environmental friendliness
• Suitable for short-term use

Im Tin / Im Silver
• Excellent flatness
• Mid-end specifications

ENIG
• Excellent reliability and flatness
• Relatively high cost

Recommendation
LF HASL or OSP are economical for single-sided PCBs.

Solder Mask
Responsible for circuit protection and appearance quality.

Colors
• Green, White, Black, Blue, Red, Yellow

Green is the most stable and cost-effective, while White and Black are used for products that prioritize appearance.

Technical Data

Item	General Specifications
Board Material	FR-4, CEM-1, CEM-3
Thickness	0.4 ~ 3.2 mm
Copper Foil	1~2 oz
Line WIdth/Pitch	200 μm (Minimum 100 μm)
Layer	1
Surface Finish	LF HASL, OSP recommended
Solder Mask	Green and others