FAQ – Printed circuit boards

1.Drill

Stardard FR4 PCB design rules.standard fr4 design rules

Machine drilling : min. 0.15mm
Laser drilling : Min. 0.1mm

Buried via only exist in multi-layer board,  inner layers connection within inner layers.

pcb buried via

Blind via only exist in multi-layer board,  inner layers connection within outer layers.

pcb blind via

Yes, we could do it.

Half Plated hole is the hole center in the outline center, a half of hole cut out.

PCB capablity of Half Plated hole is 0.5mm in Andwin.

Half plated holes widely be used in modules, such as Wifi / Blue tooth / 4G /5G / IoT NB LoRa Modules.
The modules SMT to main boards.

Via in pad is that the via holes in the SMD pad, it is not good at PCB assembly process.
General, there are 3 methods to solver it.

1. The Via is 0.3 – 0.6mm, and solder pad is big ( >5times of  Via holes ) ,
Could use solder mask filled, it is economical.
2. Via is small and the solder pad is small  （ Via in BGA )
Could choose Via filled by resin and plated over or plated over by copper directly.
For more detail , please check follow
https://www.andwinpcb.com/via-in-pad/

via in pad solder mask plug via in pad plated over microvia in pad plated over

2.Material – Which PCB raw material we can choose?

VendormaterialTg ℃Dk(1 Mhz)Dk(1 Ghz)Df(1 Mhz)Df(1 Ghz)
 DOOSAN DS-7408 140 4.5-4.8 4.3 0.015-0.02 0.014
 GOWORLD GW4011 137 4.3 0.017
 ISOLA DE104i 140 4 (2-5 GHz) 0.02 (2GHz) 0.022(5GHz)
 ISOLA FR-254 153 4.3 (2GHz) 4.2 (5GHz) 0.02 (2GHz) 0.022(5GHz)
 ISOLA FR-406 170 4.6 4.29 0.023 0.014
 ITEQ IT140TC 140 4.6 0.016
 KingBoard KB-6160 138 4.4 0.022
 KingBoard KB-6150 133 4.6 0.022
 NAN YA NP-140TL 140±5 4.2-4.4 3.8-4 0.015-0.02 0.012-0.014
 Nelco 4000-6 170 4.3 4.1 (4 2.5 GHz) 0.027 0.022 (2.5 GHz)
 SHENGYI S1141 140 4.6 0.015
 ShineMore SM-730Tg140 135±5 4.4-4.8 0.018-0.025

VendormaterialTg ℃Dk(1 Mhz)Dk(1 Ghz)Df(1 Mhz)Df(1 Ghz)
 ARLON AD255 2.55 (10GHz) 0.0018 (10GHz)
 ARLON AD350A 3.5 (10GHz) 0.003 (10GHz)
 ARLON DICLAD527 2.4-2.65 2.4-2.65 (10GHz) 0.001 0.0018 (10GHz)
 TACONIC RF-35 >315 3.5 (1.9 GHz) 0.0018 (1.9GHz)
 TACONIC TLX-9 2.5 (10GHz) 0.0019 (10GHz)
 TACONIC TLX-8 2.55 (10GHz) 0.0021 (10GHz)

VendormaterialTg ℃Dk(1 Mhz)Dk(1 Ghz)Df(1 Mhz)Df(1 Ghz)
 Arlon 25N 3.38 (10GHz) 0.0025 (10GHz)
 Arlon 25FR 3.58 (10GHz) 0.0035 (10GHz)
 RishoKogyo CS-3376B 190-200 3.6 3.4 (10GHz) 0.002 0.004
 Rogers 4003C >280 3.38±0.05 (10GHz) 0.0021 (2.5GHz) 0.0027 (10GHz)
 Rogers 4350B >280 3.48±0.05 (10GHz) 0.0031 (2.5GHz) 0.0037 (10GHz)
 Rogers 4403 >280 3.17±0.05 (10GHz)  0.0047 (10GHz)
 Rogers 4450F >280 3.3 ± 0.05 0.004 (10GHz)
 Rogers 4450b >280 3.54 ± 0.05 0.004 (10GHz)

VendormaterialTg ℃Dk(1 Mhz)Dk(1 Ghz)Df(1 Mhz)Df(1 Ghz)
 ISOLA FR408 180 3.78 0.0112
 ISOLA FR408HR 200-230 3.69 0.0091
 ISOLA FR620i 225 3.58 3.54( 10GHz) 0.0059 0.0071 (10GHz)
 ISOLA GETEK 180 3.6 (2GHz) 0.009 (2GHz)
 Nelco 4000-13 210 3.7 (1-10GHz) 0.009 (2.5-10GHz)
 Nelco 4000-13SI 210 3.4 0.008 (2.5GHz)
 Nelco 4000-13EP 210 3.7 (1-10GHz) 0.009 (2.5GHz)
 Nelco 4000-13EP SI 210 3.4 3.2(2.5-10GHz) 0.008 (2.5GHz)
 Panasonic Megtron6(R-5775(k)) 185 3.7 0.002

VendormaterialTg ℃Dk(1 Mhz)Dk(1 Ghz)Df(1 Mhz)Df(1 Ghz)
 Arlon 38N 200 4.25 0.01
 Arlon 47N 130 4.3 0.022
 Arlon 49N 170 4.4 0.025
 ISOLA FR406N 170 4.3 0.025

VendormaterialTg ℃Dk(1 Mhz)Dk(1 Ghz)Df(1 Mhz)Df(1 Ghz)
 DOOSAN DS-7402 150 4.4 0.014
 EMC EM-285 150 4.5 0.01
 EMC EM-370 175 4.5 0.012
 LG CHEM LG-E-481 150-155 4.6-4.8 0.013-0.015
 Panasonic R-1551 148 4.6 0.01
 Panasonic R-1566W 148 4.6 0.01
 SHENGYI S1155 135 4.7 0.01
 SHENGYI S1165 170 4.8 0.007

3. Updating……