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Contact: speedapcb
Company: Hunan Speeda Technology Co.,Ltd.
4F,wangdefu Building,Wanjiali Road,Furong District,Changsha,Hunan
Changsha 427000
Phone: 86 15387574935
E-Mail: Send Inquiry
Date/Time:  11/11/20 7:40 GMT



There are three common types of drilled holes in the printed circuit board: PCB
through hole plating , blind via hole, and buried via hole. Therefore, PCBs are
classified according to drilling methods and can be divided into plated
through-hole PCB, blind via hole PCB, and Buried via hole PCB.
PTH is the most common drilling method, and it is common in various types of
PCBs. SPEEDAPCB has been focusing on the production of various PTH (plated
through hole PCB-PTH PCB), buried via hole PCB and blind via hole PCB.
Click below, we’ll be happy to assist.
Drilling Method of Plated Through Hole PCB
Plated Through Hole, the copper foil lines between conductive patterns in
different layers of the circuit board are connected or connected with this type
of hole, but the copper legs of the component lead or other reinforced
materials cannot be inserted. The PCB is formed by the accumulation of many
copper foil layers. The copper foil layers cannot communicate with each other
because each layer of copper foil is covered with an insulating layer, so they
need to rely on via for signal connection.
The through hole of the circuit board must pass through the plug hole to meet
the customer's needs. In changing the traditional aluminum sheet plugging
process, the solder mask and plug hole on the circuit board surface are
completed with a white net to make its production more stable and the quality
more reliable , More perfect to use. The vias help the circuits to be connected
to each other. With the rapid development of the electronics industry, higher
requirements are also placed on the PCB manufacturing process and surface mount
technology. The plugging process for vias came into being, and at the same
time, it must meet the following requirements:
1. Only copper is required in the hole, solder plug can be plugged or not;
2. There must be tin-lead in the hole, with a certain thickness requirement
(4um), to avoid solder mask ink entering the hole, causing tin beads to be
hidden in the hole;
3. The through hole must have a solder resist ink plug hole, opaque, no tin
rings and beads, and must be flat.
Through-hole boards are common in all fields and are one of the most common
Generally, the mobile phone board or PDA board has a board that uses a
combination of blind and buried holes. The buried hole can reduce the
probability of signal interference, maintain the continuity of the transmission
line's characteristic impedance, and save routing space. Circuit board design.
This type of board requires high technical content and accurate accuracy, so
relatively speaking, the requirements for factory equipment are much higher
than ordinary multilayer boards, and the cost of such circuit boards will be
much higher than ordinary Shelf should be high.
Parameters of Plated Through Hole PCB
Items Capability.
Max board size 580X700mm
Boar Material FR-4,Aluminum, High Tg  FR4,CEM3,etc.
Min trace width/ space (inner layer) 4mil/4mil(0.1mm/0.1mm)
Min PAD (inner layer) 5 mil(0.13mm)
Min thickness(inner layer) 4 mil(0.1mm)
Inner copper thickness 0.5~4 oz
Outer copper thickness 0.4~6 oz
Finished board thickness 0.4-3.2 mm
±0.10 mm ±0.10 mm
Board thickness tolerance control ±10% ±10%
±10% ±10%
Inner layer treatment brown oxidation
Layer count Capability 1-30 LAYER
alignment between ML ±2mil
Drill hole diameter 0.15mm-0.65mm
Aspect ratio of plated hole 10:01
Hole precision ±2 mil(±0.05mm)
tolerance for Slot ±3 mil(±0.75mm)
Hole diameter tolerance(PTH) ±3 mil(±0.075mm)
Hole diameter tolerance(NPTH) ±1mil(±0.025mm)
Max Aspect Ratio for PTH 8:01
Hole wall copper thickness 15-50um
Alignment of outer layers 4mil/4mil
Min trace width/space for outer layer 4mil/4mil
Tolerance of Etching +/-10%
Thickness of solder mask on trace
Thickness of solder mask at trace corner ≥0.2mil(5um)
Hardness of solder mask On base material ≤+1.2mil
6H Finished thickness
Alignment of solder mask film ±2mil(+/-50um)
Min width of solder mask bridge 4mil(100um)
Max hole with solder plug 0.5mm
Surface treatment HAL (Lead or Lead free), immersion Gold, Immersion
Nickel, Electric Gold finger, plated Gold, OSP, Immersion Silver.carbon
Max Nickel thickness for Gold finger 280u"(7um)
Max gold thickness for Gold finger 30u"(0.75um)
Nickel thickness in Immersion Gold 120u"/240u"(3um/6um)
Gold thickness in Immersion Gold 2u"/6u"(0.05um/0.15um)
Impedance control and its tolerance 50±10%,75±10%,100±10% 110±10%
Trace Anti-stripped strength ≥61B/in(≥107g/mm)
bow and twist 0.75%

SPEEDA Technology is an electronic technology company formed by a team with an
average of 10+ years of electronic industry experience. As one of the best pcb
manufacturers in china, the company is mainly engaged in the design, R&D
(research and development), manufacturing, and sales of various printed circuit
boards. We provide pth board ,pcb board with holes and etc for sale.Our
products are widely used in communication equipment, computer and network
equipment, consumer electronics, automotive electronics, industrial control,
new energy, rail transit, and other industries. We provide customers with a
"one-stop" service, that is, an integrated service system consisting of printed
circuit board design optimization, small-batch sample production, batch
production, and after-sale services. Adhere to quality first, service first, to
improve customer satisfaction as the goal continuously.

SPEEDA, Your Best Business Partner.

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SOURCE: Import-Export Bulletin Board (
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