Name: 2 layer PCB
Brand: PCB Printed Circuit Board and PCBA manufacturing
Availability: InStock
Rating: 5 (1 reviews)

Description
Data Sheet

2 Layer PCB is a core circuit board with copper foil laminated on both the top and bottom sides of the insulating substrate. As the most mainstream and widely used PCB type, it features conductive circuit patterns on two outer layers. Electrical interconnection between the top and bottom traces is realized through plated vias and component pads. With double-sided routing space, wiring difficulty is greatly reduced, making double-sided boards the preferred solution for most conventional electronic products.

To utilize circuits on both layers, reliable electrical interconnection is required. Plated through-holes act as conductive bridges, with metal coating inside small drilled holes to connect top and bottom copper traces. Compared with single-sided PCB, the effective wiring area of a 2 layer PCB is doubled, perfectly solving the single-layer routing crossover limitation. It supports relatively complex circuit design and offers better design flexibility.

2 layer PCB

2 Layer PCB vs 4 Layer PCB (SMT Processing Comparison)

2 Layer PCB

Featuring simple structural design and mature manufacturing technology, double-sided boards are easy for SMT assembly. Though more complex than single-sided PCB, it balances performance and cost without redundant layered design. Lower production complexity greatly reduces manufacturing costs and shortens lead time. Additionally, 2 layer PCB delivers stable signal transmission with negligible propagation delay, ideal for cost-sensitive conventional electronic equipment.

4 Layer PCB

A 4-layer PCB provides more internal wiring layers and larger layout space, suitable for high-density, high-precision and complex electronic devices. However, multi-layer lamination and internal layer processing lead to higher production costs, longer R&D cycles and slower mass production. Unreasonable layered design may cause signal interference and transmission delay, requiring stricter engineering design and process control.

2 Layer PCB Design Rules: Via & Pad

Via

Vias are classified into through holes, blind holes and buried holes, dedicated to electrical connection between different circuit layers. Vias are not applicable for through-hole component soldering. There is no strict aperture limitation for conventional vias in production.

Pad

Pads are divided into through-hole pins pads and surface-mount pads.

Pin pads with drilled holes are used for through-hole component welding and mechanical fixation;
SMT pads are hole-free, designed for surface-mounted components.

The hole diameter of component pads is strictly controlled with a production tolerance of ±0.08 mm.

Core Differences Between Via and Pad

Vias only undertake electrical conduction. To optimize production efficiency, processes such as hole expanding and unified drill bit merging are commonly adopted. Aperture can be appropriately reduced to adapt to narrow line width and spacing. Solder mask ink can cover via surfaces as required.

Pads provide both electrical connection and mechanical fixation. Their aperture must match component pin sizes to ensure smooth assembly. Solder mask is prohibited on pad surfaces to guarantee soldering quality. Excessive or insufficient pad hole size will cause loose installation or assembly failure.

2 layer PCB

2 Layer PCB Standard Manufacturing Process

Raw double-sided copper-clad laminate → Board cutting → Reference hole drilling → CNC through-hole drilling → Pre-inspection → Deburring → Surface brushing → Electroless copper plating (through-hole metallization) → Full-board thin copper electroplating → Testing → Circuit pattern printing (dry film / wet film exposure & development) → Trimming → Pattern electroplating → Tin plating (anti-corrosion) → Resist stripping → Copper etching → Tin removal → Cleaning & brushing → Solder mask printing & UV curing → Silkscreen legend printing & curing → Profiling routing → Cleaning & drying → Electrical open/short test → Surface finishing (HASL / immersion tin / OSP) → Final inspection → Packaging & shipment

Through-Hole Copper Plating Quality Control

The electroplated copper layer of through-holes is critical to 2 layer PCB reliability. As electronic products develop toward high density and high precision, the copper plating layer requires strong adhesion, uniform texture, stable tensile strength and elongation.

For high aspect ratio boards, high-performance plating additives are adopted, combined with moderate air agitation and cathode movement. Production is operated under low current density to expand the electrode reaction area inside tiny holes and maximize the effect of plating additives. Cathode movement effectively improves deep plating capacity, optimizes crystal nucleation and growth balance, and forms high-toughness, uniform copper layers.

Current density is configured according to the actual plating area, coordinated with key parameters including main salt concentration, solution temperature, additive content and stirring intensity. Strict overall process parameter control ensures uniform hole copper thickness and long-term circuit stability.

Maxipcb 2 Layer PCB Manufacturing Strength

Maxipcb is a professional PCB manufacturer with mature double-sided board production lines. We support large-scale mass production, cost-effective pricing and fast delivery. With strict full-process quality control, we provide high-quality, low-cost 2 layer PCB customized services to meet diverse prototype, small-batch and mass production demands.

Model: 2 layer PCB

Material: FR4

Material manufacturer: KB, SY, ISOLA

Layer: 2Layer

Color: Green/White/Black

Finished Thickness: 0.15mm - 12mm

Copper Thickness: 1OZ - 6OZ

Surface Treatment: Immersion Gold/OSP/HASL

Application products: power adapter, control panel

2 layer PCB

Description

Data Sheet