Selective Hard Gold PCB High TG FR4 Material main board| YMS PCB
The difference between hard gold and soft gold
The difference between hard gold and soft gold is the composition of the layer of gold that is finally plated. When plating gold, you can choose to electroplate pure gold or alloy, because the hardness of pure gold is soft, so it is also called "soft gold".
Full Body Hard Gold is generally a rarely-chosen surface finish, where the full body of the PCB board is plated with hard gold. In order to apply a Full Body Hard Gold surface finish, an electrolytic process using an electric current or an immersion process is needed, depending on the PCB design.
For Complete PCB Assembly projects, where we fabricate and assemble the boards, we will also need to consider the poor solderability of this finish; a very active flux will be required to solder effectively to the hard-gold-plated pad.
If you have any further questions about our PCB Surface Finish capabilities, or to get started on your project with YMS today, you can Contact Us over email at email@example.com.
What is high Tg PCB (printed circuit board)
Normally high Tg refers to high heat resistance in PCB raw material, the standard Tg for copper clad laminate is between 130 – 140℃, High Tg is generally greater than 170℃, and middle Tg is generally greater than 150℃. Basically the printed circuit board with Tg≥170℃, we call high Tg PCB.
▪ Usual thickness: 0.7 µm (0.00003”) to 1.3 µm (0.00005”) gold (99.7%) over 5.0
▪ µm (0.0002”) nickel or 0.2 µm (0.000008”) to 0.3 µm (0.00001”) gold (99.7%) over
▪ 5.0 µm (0.0002”) nickel for a solderable surface
▪ Very good for corrosion resistance
▪ Rated at 130-220 Knoop hardness
▪ Very good wear resistance
▪ Excellent for surface rotary switches, on-off contacts, and edge connectors
▪ Very good shelf life
YMS High Tg PCB manufacturing capabilities:
YMS High Tg PCB manufacturing capabilities overview
|Available Multilayer PCB Technology||Through hole with Aspect Ratio 16:1|
|buried and blind via|
|Hybrid||High Frequency Material such as RO4350B and FR4 TG 180°Mix etc.|
|High Speed Material such as M7NE and FR4 TG 180°Mix etc.|
|Minimum line Width and Space||0.05mm/0.05mm(2mil/2mil)|
|Min mechanical Drilled Size||0.15mm(6mil)|
|Aspect Ratio for through hole||16:1|
|Surface Finish||HASL, Lead free HASL,ENIG,Immersion Tin, OSP, Immersion Silver, Gold Finger, Electroplating Hard Gold, Selective OSP，ENEPIG.etc.|
|Via Fill Option||The via is plated and filled with either conductive or non-conductive epoxy then capped and plated over(VIPPO)|
|Copper filled, silver filled|
|Solder Mask||Green, Red, Yellow, Blue, White, Black, Purple, Matte Black, Matte green.etc.
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What is hard gold PCB?
The Hard Gold surface finish, also known as Hard Electrolytic Gold, is composed of a layer of gold with added hardeners for increased durability, plated over a barrier coat of nickel using an electrolytic process.
what is hard gold plating?
Hard gold plating is a gold electrodeposit that has been alloyed with another element to alter the grain structure of the gold to achieve a harder deposit with a more refined grain structure. The most common alloying elements used in hard gold plating are cobalt, nickel or iron
How do you make hard gold PCB boards?
We first plate 3 – 6 microns of nickel onto the edge connector fingers and then on top of that 1 – 2 microns of hard gold. The plated gold is not 100% pure; it contains some cobalt to increase the wear-resistance of the surface.